POLYMERIC PACKAGE WITH RESEALABLE CLOSURE AND VALVE, AND METHODS

Abstract

A reclosable package having a zipper closure, and optionally a slider device to open and close the zipper closure. The package includes a sealant stripe, which can be a peal seal, and a one-way fluid valve. In use, the valve is used to remove air from the interior of the package, and the sealant strip, in combination with the zipper closure, provides a better seal than the zipper alone. The package may be part of a storage system that includes stand-off structures adjacent to the valve, a vacuum pump assembly, and a liquid separator assembly coupled to the vacuum pump assembly.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application Ser. No. 60/729,778, filed on Oct. 24, 2005; U.S. Provisional Application Ser. No. 60/736,810, filed on Nov. 14, 2005; and U.S. Provisional Patent Application No. 60/763,063, filed Jan. 27, 2006. Application Nos. 60/729,778; 60/736,810; and 60/763,063 are each incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to evacuable storage devices such as polymeric packages, and in particular, to a vacuum storage system that includes a resealable closure arrangement and a valve, and methods of vacuum storage.

BACKGROUND

Flexible polymeric packages may be used to hold a variety of products. Such products may be a variety of edible food products such as cheese, meat, crackers, sugar, powdered sugar, flour, salt, and baking soda, or non-food products such as laundry detergent, sand, medical supplies, and other products. Resealable packages are convenient because they can be closed and resealed to preserve and contain the enclosed contents. Resealable packages are also advantageous because they help prevent food products from spoiling and may be opened and closed multiple times.

SUMMARY OF THE DISCLOSURE

The present disclosure is directed to a reclosable package from which air or other gas within the interior of the package, which surrounds the item being retained therein, can be removed. The package has a zipper closure and a one-way fluid valve that allows air, gas, or other fluid to be removed from the interior of the package. Prior to use by the consumer, the package has a hermetically sealed interior volume, in which the item is contained. Upon use by a consumer, the zipper is opened, the seal is breached, and access is gained to the interior of the package. After use, the zipper is closed and then the valve is used to evacuate air, gas or other fluid from the interior of the package. The peal seal may be optionally re-sealed. A slider device may be used to open and close the zipper closure.

Various methods for using the package, and of making the package, are described.

These and various other features that characterize the packages of this disclosure are pointed out with particularity in the attached claims. For a better understanding of the packages of the disclosure, their advantages, their use and objectives obtained by their use, reference should be made to the drawings and to the accompanying description, in which there is illustrated and described preferred embodiments of the invention of this disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

A fall understanding of the invention can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which FIGS. 1-21 relate to the disclosure of patent application no. PCT/US2005/026070, FIGS. 22-26 relate to the disclosure of U.S. Provisional Application Ser. No. 60/729,778, and FIGS. 28 and 29 relate to the disclosure of U.S. Provisional Application Ser. No. 60/736,810.

FIG. 1 is a front view of one storage device embodiment.

FIGS. 2-7 are cross-sectional views of other embodiments of resealable closure devices including a sealing compound suitable for at least incidental contact to food items contained within the device.

FIG. 8 is a perspective view illustrating another storage device embodiment having a clamping member that provides a resealable closure.

FIG. 9 is an exploded perspective view of an example vacuum valve assembly.

FIGS. 10a-10c are front views of several example stand-off structures.

FIGS. 11a-11c are perspective views of further example stand-off structures.

FIGS. 12a-12b are cross-sectional views of some example stand-off structures.

FIGS. 13a-13d are perspective views of several storage device embodiments showing storage devices in an unfolded condition with different stand-off configurations.

FIG. 14 is a perspective view of a storage device embodiment shown in a folded arrangement.

FIG. 15 is a cross-sectional view of the storage device depicted in FIG. 14 along section line 15-15.

FIGS. 16a and 16b illustrate a front view and a side view, respectively, of an example closing clip.

FIG. 17 is a side view of an end stop embodiment.

FIG. 18(a) is a perspective view of an example suction cup tip of a portable vacuum pump.

FIG. 18(b) is a side cross-sectional view of the suction cup tip shown in FIG. 18(a).

FIG. 19 is an exploded cross-sectional view of a liquid separator embodiment.

FIG. 20 is an exploded perspective view of the liquid separator shown in FIG. 19.

FIG. 21 is a perspective view of an example closure system embodiment, wherein the system includes a bag, a stand-off structure, and a vacuum valve assembly.

FIG. 22 is a perspective view of another embodiment of a polymeric package.

FIG. 23 is a cross-sectional view of the package of FIG. 22 taken along line 23-23.

FIG. 24 is a perspective view of another embodiment of a storage device.

FIG. 25 is a perspective view of the storage device of FIG. 24 illustrated with a food item contained there.

FIG. 26 is a perspective view of the storage device of FIGS. 24 and 25 illustrating a method of closing the adhesive seal of the storage device.

FIG. 27 is a cross-sectional view of the storage device of FIG. 24 taken along line 27-27.

FIG. 28 is a perspective view of another embodiment of a storage device.

FIG. 29 is a cross-sectional view of the storage device of FIG. 27 taken along line 29-29.

FIG. 30 is a perspective view of another embodiment of a storage device in accordance with the present disclosure.

FIG. 31 is a cross-sectional view of the storage device shown in FIG. 30 taken along line 31-31.

DETAILED DESCRIPTION

The present invention is now discussed in more detail referring to the drawings that accompany the present application. In the accompanying drawings, like and/or corresponding elements are referred to by like reference numbers. In one embodiment, a vacuum system is provided that may include a portable vacuum pump and an evacuable package in communication through a vacuum conduit. The evacuable package may optionally include a stand-off structure and a reasealable closure having a caulking composition disposed thereon. In one embodiment, the resealable closure comprises interlocking profiles on which the caulking compound is disposed to provide a gas permeation resistant seal in the resealable closure. The vacuum conduit provides communication between the portable pump and the storage portion of the evacuable bag, wherein the vacuum conduit comprises at least a valve assembly and optionally a stand-off structure. In one embodiment, the stand-off structure provides a means to substantially eliminate the incidence of trapped air within the storage area of the evacuable package. Each of the aspects of the interlocking profiles, the caulking composition, the vacuum valve assembly, the stand-off structure, and the vacuum pump are now discussed in greater detail.

The example embodiments disclosed hereinafter address needs evident in the art. Flexible, sealable storage devices, such as Consumer Storage Bags are commonly used to store items such as, but not limited to, food. These devices typically have a bag body made from a thin, flexible plastic material and include a resealable closure. While inexpensive and easy to use, these devices also allow a quantity of air to be enclosed with the item being stored. Air within a storage device containing food is not desirable as the air reacts with the food and will cause spoliation. Additionally, when storage bags are placed in a below freezing environment, typically in a freezer, “freezer burn” may also damage the food items. Freezer burn occurs when moisture is drawn from the food item and forms ice, typically on the food item. Freezer burn is reduced when entrapped air is substantially eliminated from the storage device with concomitant contouring of the bag wall of the storage device around the food item. Consequently, less moisture will be drawn out of the food item. To this end it is known to evacuate a flexible storage device prior to sealing it. However, such systems heretofore did not include a resealable opening in the storage device.

Prior systems that evacuate flexible storage bags typically include a large device having a vacuum unit and a heat sealer structured to bond sheets of plastic together. The user typically cuts a length of plastic from a roll of plastic and uses the heat sealer to form the plastic into a bag with an opening. After an item has been placed in the bag through the opening, the vacuum unit is then used to remove substantially all of the air from the bag and the bag is sealed. Systems such as these fabricate a bag or pouch that can only be used once. The cost of material is high as reusability is not an option. These large devices are not portable and the act of forming a bag is time consuming.

There is need for a vacuum storage system utilizing a portable vacuum device and optionally a resealable, evacuable, flexible storage device. Resealable closure systems are known, for example, interlocking profiles used in plastic bags. However, in a typical resealable closure, engagement of the sealing structures is rarely perfect, leaving gaps in the profile seal. Moreover, during manufacture of reclosable devices, frequently seals at the ends of the reclosable device distort the engaging portions of the closure that can also provide an unsealed region in the closure. As a consequence of these and other problems associated with resealable closures, a bag utilizing a resealable closure may not be airtight. Consequently when a bag utilizing a resealable closure is subjected to a pressure differential, for example, when it is evacuated or when there is a partial pressure differential of a particular gas between the inside and outside of the bag, gas can leak across the resealable closure and enter, or leave the sealed package through the closure. Thus, gases, for example, air may penetrate into a sealed bag, or for example water vapor may leak from a sealed bag. This is especially a problem when the interior of the bag is at a different pressure than the ambient air, for example, when the bag is under a vacuum, or when the bag contains a gas at a higher or lower partial pressure than the gas is present in the ambient.

Accordingly, there is also a need for a flexible, resealable storage device, wherein the sealing structure has a resistance to fluid permeability under a pressure differential across the sealing device. Moreover, there is a need for a pre-made, inexpensive, flexible, reusable storage device having a valve structured to operate with a portable vacuum pump. Additionally, there is a further need for a resealable closure that provides for reduction in entrapped air, a flexible bag wall to maintain item conformance, and an air tight seal providing reduced permeability to oxygen, atmosphere intrusion or transmission, bacteria, molds and/or other sources of contamination when used in combination with vacuum pump technology. There is also a need for vacuum pump technology that provides for portability and utility in evacuating a food storage flexible package.

Referring to FIG. 1, in one embodiment, the flexible, resealable storage device 10 comprises a flexible material 12 shaped as an evacuable package 14 (also referred to as “evacuable bag” and “polymeric package”). The flexible material 12 is preferably a plastic sheet 16, such as polyolefin. The sheet 16 is, preferably, rectangular. In one embodiment, the sheet 16 is folded over upon itself and two lateral sides 15 are sealed adjacent to the periphery to provide an opening 18 to a storage space 22. As such, the periphery of the bag 14 is substantially sealed. In another embodiment, the entire periphery of the evacuable bag 14 is heat sealed.

In one embodiment of the present disclosure, the evacuable package 14 may be a multilayer bag comprising an inner sealant layer and a barrier/strength layer. The inner sealant layer may comprise LDPE (low density polyethylene) or LLDPE (linear low density polyethylene) and the barrier/strength layer may comprise Nylon, PP (polypropylene) or PET (Polyester). As used herein the term “low density” in conjunction with polyethylene denotes a material having a density of no greater than 0.925 g/cm³, as defined by ASTM standard D-15005-03, wherein the density may be adjusted with the addition of ethylene vinyl acetate (EVA). Another example of a multilayer bag and a method of forming a multilayer bag is described in U.S. Pat. No. 4,267,960, titled “Bag For Vacuum Packaging of Meats or Similar Products”, filed Aug. 29, 1979, which is incorporated herein by reference.

In the embodiments of the present disclosure in which the evacuable bag 14 has an opening 18 to the storage space 22, the bag opening 18 includes a resealable closure 20. The resealable closure 20 may include a set of interlocking profiles. In one example, the set of interlocking profiles 21 may include resilient, selectively engaging male and female profiles 21 (tongue-and-groove closure), structured to seal the opening 18. It will be appreciated that there are numerous interlocking profile geometries known, which can be employed in the embodiments disclosed herein.

With reference to FIG. 2, in one embodiment, the selectively engaging profiles of closure 21 (also termed herein sometimes for convenience as interengaging profiles) are positioned along two opposing flexible flanges (also termed herein sometimes for convenience as “panels”) including a first flange 50 and a second flange 52. As shown in FIG. 2, the two flexible panels 50, 52 may include a raised surface 68, 69 on the inside surface of the panels disposed outside the resealable closure. The first flange 50 includes a male profile having at least one protrusion 54 that extends laterally across the bag 14. The second flange 52 includes a female groove 60 defined by at least two protrusions (56, 58).

Still referring to FIG. 2, there may be multiple protrusions 62, 64, extending from the first and second flanges 50, 52 and forming multiple corresponding male profiles and female grooves (also termed herein sometimes for convenience as a female profile). The protrusions 54, 56, 58, 62, 64 are generally formed from a polyolefin material with a density of not less than approximately 0.925 g/cm³, preferably those described as a High Melt Index polyolefin (HMI). More specifically, the protrusions 54, 56, 58, 62, 64 may comprise High Melt Index (MI) Polyethylene materials and Ethylene Vinyl Acetate (EVA) Copolymers, particularly those having a vinyl acetate content of from about 4 weight percent to about 12 weight percent. In addition, portions of the interengaging profiles and/or surrounding closure structures may include one or more features comprising low melt index or Ultra Low Density (ULD) Polyolefins. As used herein, the term “Ultra Low Density” denotes a density no greater than approximately 0.925 g/cm³. As will be appreciated, the density may be adjusted with the addition of EVA. At least one protrusion 54, 56, 58, 62, 64 may include a bead 66 of polyolefin material with a density of not more than approximately 0.925 g/cm³. In some embodiments a bead 66 of softer material is disposed at the tip of a protrusion 54, 56, 58, 62, 64 and is structured to engage the opposing side 50, 52. The bead 66 of softer material is hereafter referred to as a bead of sealing material 66.

As discussed above, the bead of sealing material 66 may have a lower density than the protrusions 54, 56, 58, 62, 64. During the engagement of closure 21, the lower density and hence more compliant bead of sealing material 66 conforms to the geometry of the higher density and more rigid material comprising the portion of the closure against which the head of the profile abuts upon engagement. The softer material abuts the closure with increased conformance to the abutting surface, advantageously providing a more effective seal against fluid exchange between the interior of the package and the ambient, for example, the intrusion of gas and the exterior atmosphere into the evacuable bag 14. Regardless of the above described embodiments, the resealable closure 21 and its associated interlocking structures can comprise resilient materials of varying densities and melt indexes. Accordingly, embodiments within the scope of the present disclosure, including combinations of materials selected to achieve sealant conditions under vacuum and reduced temperature conditions.

The protrusions forming the male profile may also be referred as a profile having a male head. The protrusions defining the female profile (also referred to as a groove) may also be referred to as profile having a female head and a fillet positioned to provide a groove. The resealable closure structure 20 may further include a closing clip structured to ensure the complete engagement of the closure profiles. Specifically, the closure clip functions to ensure that the interengaging profiles are engaged as the clip is disposed along a first direction, but does not affect the engagement of the profiles when disposed along the direction opposite to that of the first direction.

Regardless of the specific details of construction or interaction of the profiles of resealable closure 21, the interengaging portions of the resealable closure of the disclosed embodiments preferably include a caulking composition 99. For example, the caulking composition may be positioned on at least one protrusion 54 on the first flange 50 and/or at least one protrusion 56, 58 on the second flange 52 of the closure 21, wherein the caulking composition 99 assists in creating an airtight seal to the storage space 22. Specifically, during engagement of the first and second flange protrusions 54, 56, 58, 62, 64 of the male and female profiles, the caulking composition 99 sits within the groove 60 to ensure an air-tight seal of the male and female profile. Specifically, the caulking composition 99 is positioned to infiltrate the void space defined between the engaged interlocking profiles of closure 21. Without wishing to be bound by theory, it is believed that that the caulking composition 99 acts to infiltrate gaps between the male and female profiles, thus reducing the infiltration of ambient into the storage device when it is placed in a condition of reduced pressure.

Accordingly, the resealable closure 20 is prepared before sealing by introducing the sealing compound onto one or more members of the interengaging profiles or onto a surface of the closure proximal to the interengaging profiles, by methods such as deposition or injection, where it will be distributed during the interlocking process within incipient gaps left between the interengaging profiles after interlocking. Alternately, prior to sealing the closure, the sealing compound can be placed proximal to known areas in which the sealing profile is prone to exhibit gapping, for example, the ends of the male and female profiles 21 at the bag's periphery. The portions of the male and female profiles at the bag periphery are engaged by crush seal, which is often the site of leakage in the closure device. The voids caused by the crush seal engagement at the male and female profile may be filled with caulking composition to substantially reduce the incidence of leakage.

The caulking composition 99 may comprise any material that provides a selectively reversible air tight seal between interengaging members of the resealable closure 21, in which the caulking composition 99 is suitable for at least incidental contact to food items inserted through the opening to the storage space. Preferably, the caulking composition maintains its chemical structure throughout the operable temperature range of storage device 10. The term “suitable” for at least incidental contact denotes compounds that are eligible for compliance with or equivalent to being in compliance with the Federal Food Drug and Cosmetic Act (Title 21 of the Code of Federal Regulations) standards for being generally recognized as safe (GRAS). The term “at least incidental contact” includes at least the unanticipated contact of food items being passed through the opening on which the closure strip is positioned as the food items are being inserted into the storage space. Although indirect contact between the caulking composition and the food items is preferred, in some embodiments the caulking composition may more directly contact the food, so long as the interaction between the food items and the caulking composition is in accordance with the regulations of the Federal Food Drug and Cosmetic Act.

It is noted that caulking compositions that are suitable for at least incidental food contact may be consistent with the classification of materials for “lubricants with incidental food contact” according to Title 21 of the United States Code of Federal Regulations §178.3570 (revised as of Apr. 1, 2003), so long as the materials are consistent with the Federal Food Drug and Cosmetic Act and have an operable temperature range suitable for food storage and packaging. In some preferred embodiments, the operable temperature range of the storage device is defined as the temperature range that the storage bag is typically subjected to in shipping, packaging and food storage applications, for example, food storage applications ranging from approximately −10° F. to approximately 160° F. One example of a caulking composition that is listed as a “lubricant with incidental food contact” according to Title 21 Of the United States Code of Federal Regulations § 178.3570 and has an operable temperature range suitable for food storage and packaging comprises dimethylpolysiloxane. Another example is soy-based oils, for example, those distributed by Cargill Corp., and soy-based adhesives, for example, those distributed by Dupont as Pro-cota™ soy polymers.

In order to provide an air tight seal, in some embodiments the caulking composition 99 should be selected to have a work penetration of about 290 to about 340, in which the work penetration is measured at 60 strokes and a temperature of 77° F. in accordance with the National Lubricating Grease Institute (NLGI) system for rating greases by penetration and ASTM D217-97 titled “Standard Test Methods for Cone Penetration of Lubricating Grease” (1997). The NLGI classifies greases by consistency numbers as measured by worked penetration. In a preferred embodiment, the caulking composition 99 has a work penetration on the order of about 290 to about 340 and is classified as a grease having a NLGI consistency number equal to approximately 2. Although it is preferred that the caulking composition 99 have NLGI consistency number equal to approximately 2, greases having lower or higher NLGI consistency numbers may alternatively be utilized, so long as the caulking composition 99 may be applied to the interengaging profiles of closure 21 using conventional injection methods and that the caulking composition 99 is contained within the closure 21 when exposed to temperatures consistent with food storage container applications.

One example of a caulking composition 99, which meets the above requirements is silicone grease. Silicone grease is an amorphous, fumed silica thickened, polysiloxane-based compound. Silicone grease is formed by combining liquid silicone with an inert silica filler. One example of liquid silicone that may be utilized in forming silicone grease having suitable work penetration properties is polydimethylsiloxane having a specific gravity on the order of about 0.973 and a viscosity greater than about 300 centistokes, preferably on the order of about 350 centistokes. Fumed silica, an inert silica filler, has a chain-like particle morphology and when incorporated into liquid silicone forms three dimensional networks that trap the liquid and effectively increases the liquid's viscosity.

Silicone grease may provide desired work penetration values and temperature range to produce an adequately air tight seal between the interengaged profiles of closure 21 by selecting the proper proportions of inert silica filler to liquid silicone. The proportion of inert silica filler to liquid silicone is generally selected to ensure that separation of liquid from solid in the silicone grease is substantially eliminated throughout the operable temperature range of the bag as applied to food container storage. In general, proportions of inert silica filler to liquid silicone are selected to yield a silicone grease viscosity that would not inhibit the application of the silicone grease onto the closure 21. The proportion of inert silica filler to liquid silicone is preferably less than approximately 30% by weight. Even more preferably, the proportion of inert silica filler to liquid silicone is on the order of 6% by weight.

In one highly preferred embodiment, the silicone grease 99 is provided by Clearco™ Silicone Grease (food grade) provided by Clearco Products Co., Inc., Bensalem Pa. Clearco™ Silicone Grease (food grade) has a work penetration value of about 290 to about 340, in which the work penetration is measured at 60 strokes and a temperature of 77° F. Clearco™ Silicone Grease (food grade) comprises 94% dimethylpolysiloxane and 6% fumed silica by weight % and has a specific gravity on the order of about 1.1. Clearco™ Silicone Grease may be utilized at temperatures ranging from approximately −40° F. to approximately 400° F. without chemical decomposition and is therefore well suited for food storage applications. In this embodiment of the present disclosure, the silicone grease 99 may be positioned along at least one of the male and female profiles of closure 21, wherein incidental contact to food being inserted into the storage space of the storage device typically accounts for less that 5.0 ppb of silicone grease being incorporated into the food item being stored.

In another embodiment of the present disclosure, the caulking composition may comprise a soy adhesive. Similar to the above-described caulking compositions, the soy adhesive preferably is suitable for incidental food contact and has an operable temperature range suitable for food packaging and storage. One example of a soy adhesive is Pro-cote® soy polymer, which is available from DuPont™. In general, soy adhesive is prepared by extracting and refining soy oil from dehulled, flaked soybeans. The extracted material contains isolated soy protein in its native or globular form; and soluble, low molecular weight sugars. The extract is then processed in a controlled pH environment at tightly controlled temperatures to uncoil globular native soy protein into smaller units, and fractionating the material into uniform polymer fractions. The isolated protein molecule fractions are highly reactive and are chemically treated to modify the protein chain to provide desired adhesive properties. Unmodified soy-based oils may also be employed as a caulking composition. An alternative source of soy based oils and adhesives is the soy products available from Cargill™ Industrial Oils & Lubricants.

As will be appreciated, numerous reactive materials may also be employed as caulking compositions. In particular, materials which may be coated as separate reactants onto separate interengaging portions of the closure that are admixed upon engagement of the interengaging portions of the closure may be utilized. Accordingly, when the closure parts are engaged the admixed reactants will be combined, reacting and forming in-situ a caulking composition that is infiltrated into a least one void defined by the engaged interengaging portions of the closure. One example of such a system comprises a free-flowing reactive polymer liquid and a liquid cross-linking agent, each coated on separate portions of the closure. In this example, when the closure is engaged, the separate portions contact, admixing the polymer and cross-linking agent, providing a viscous, cross-linked polymer caulking compound which is infiltrated into voids in the closure defined by the interengaged portions of the closure. Others examples include the provision of a free-flowing liquid and a gelling agent on separate portions of the closure to form a viscous caulking agent upon admixture, and the provision of a two-part adhesive material which react to form an adhesive upon admixture, for example, formation of a pressure-sensitive adhesive. Other types of chemical transformations will also be apparent to those of skill in the art.

Referring now to FIG. 3, in another embodiment of the present disclosure, the resealable closure structure includes at least two sets of opposed interlocking profiles 150 respectively having interengaging profiles 24, 28 and 23, 26 selectively engaged in sealing the opening 18 to the storage space 22. Each pair of interengaging profiles comprise a geometry having a symmetrical head (32, 36) extending from a stem (30, 34). Each asymmetrical head is preferably offset on the stem to complimentarily fit into the void space defined by stem 34, post 38 and asymmetrical head 36. The term “asymmetrical head” denotes that the centerline of the head portion of the profile is substantially offset from the centerline of the stem portion of the profile to which it is affixed.

The void space defined by stem 34, post 38 and asymmetrical head 36 comprises a groove configured to selectively engage the asymmetrical head 32 of the corresponding interengaging profile 23, 24. Stem 34, post 38 and asymmetrical head 36 are spaced to selectively engage corresponding interengaging profiles 23, 24. The spacing between the post 38 and stem 34, and between post 38 and asymmetrical head 36 is sufficiently narrow to bias asymmetrical head 32 toward asymmetrical head 36 when profiles 23, 24, 26, and 28 are engaged. The biased positioning of the asymmetrical head 36 in combination with the spacing of post 38 to correspond to the width of asymmetrical heads 23, 24 defining a grove that reversibly interlocks asymmetrical head 23, 24 into the groove when the profiles are engaged.

Still referring to FIG. 3, the resealable closure further includes a caulking composition 99 positioned on at least one of asymmetrical heads 23, 24, 26, and/or 28. The caulking composition 99 may be deposited or injected onto the profiles 23, 24, 26, and/or 28 insuring that an air tight seal is obtained when the profiles 23, 24, 26, 28 are interengaged under varying temperature and pressure conditions. The caulking composition 99 may be positioned along the entire length of the opposed interlocking profiles 150 or only a portion of the opposed interlocking profiles 150, such as the end portions of the opposed interlocking profiles 150 at the bag's periphery.

In another embodiment, shown in FIG. 4 (without showing certain reference numbers for clarity), the resealable closure 20 includes a bead of caulking composition 100 in the gap between two parallel sets of opposed interlocking profiles 150. In application, as each set of opposed interlocking profiles 150 are interengaged, the bead of caulking composition 100 contacts the ends of each set of opposed interlocking profiles 150. In a preferred embodiment, the bead of caulking composition 100 fills the void separating the parallel sets of opposed interlocking profiles 150 and contacts the female profiles grooves 26, 28 in each set of opposed interlocking profiles 150, thereby creating a seal. In a further embodiment of the present disclosure, the resealable closure structure 20 includes a bead of caulking composition 100 in the gap between two parallel sets of opposed interlocking profiles 150 and additional caulking composition 99 between at least one set of interengaging profiles (23, 26) and (24, 28).

In another embodiment, shown in FIG. 5 (without showing certain reference numbers for clarity), the resealable closure 20 includes a bead of sealant material 45 in the gap between two parallel sets of opposed interlocking profiles 150. The sealant material 45 is a composition of high EVA & high MI polymers selected to provide a high-conformance region in the closure, as described above. Additionally, a bead of sealant material 53, 55 may be applied to the distal tip of each male profile 23, 24. In general, suitable sealant material comprises compositions of polymers as described above or alternatively ultra-low density (ULD) polymers (as defined above) with EVA additives at a 2% or higher loading. Beads of sealant material 45, 53, 55 ensure that an air-tight barrier exists between substantially the entire length of interengaging profiles (23, 26) and (24, 28) when the resealable closure structure 20 is engaged. A bead of sealing material 45 may also be positioned on both sides of a single set of opposed interlocking profiles 150, as depicted in FIG. 6. Similar to the above described embodiments, a bead of caulking composition may be employed between parallel sets of opposed interlocking profiles and/or the caulking composition may be employed between at least one set of interengaging profiles (23, 26) and/or (24, 28).

Referring now to FIG. 7, in yet another embodiment of the present disclosure, the resealable closure 20 may be provided by resealable closure strips having independent and substantially symmetric profiles 60, 62, 64, 66, unlike the embodiments above utilizing asymmetrical structures. Accordingly, the heads (described below) are not offset relative to the stems. That is, each symmetric element 60, 62, 64, 66 includes a head 70 and a stem 72. The head 70 is disposed generally symmetrically on the stem 72. The symmetric profiles 60, 62, 64, 66 are disposed with two elements of each panel 12, 14 and are spaced and configured so that the gap between adjacent elements defines a void region which has a shape corresponding to the shape of the symmetric profiles 60, 62, 64, 66. This embodiment further includes outer elements 80, 82. The outer elements 80, 82 are offset toward the symmetric profiles 60, 62, 64, 66 and bias the symmetric profiles 60, 62, 64, 66 into each other. The outer elements 80, 82 are sized and shaped to correspond to the outer most two symmetric profiles 60, 66. Similar to the above described embodiments, a bead of caulking composition may be employed between one or more of the symmetric profiles 60, 62, 64, 66. Additionally or alternatively the profiles may incorporate a region of sealing material, as described above, for example, by coextrusion of the sealing material with the base material comprising the profile.

Additionally, although not depicted in FIG. 7, multiple sets of opposing interlocking profiles may be employed incorporating independent and substantially symmetric profiles, wherein a bead of caulking composition may be position between two sets of opposing interlocking profiles. The bead of caulking compound may be employed separately or in conjunction with caulking compound disposed between each of the symmetric profiles. It is noted that the disclosed embodiments are not limited to profile geometries disclosed above, as any profile geometry may be utilized and is within the scope of the present disclosure, so long as the geometry of the profiles is compatible with the sealing compound in a manner that provides an air-tight seal.

Referring to FIG. 8, in one embodiment of the present disclosure, the resealable closure 20 comprises an opening and a clamping means. The clamping means may comprise a clip 170 that is separate from the evacuable bag 14, in which the clip 170 seals the opening 18 of the bag 14 in clamp seal engagement. In another embodiment the clamping means may further include a mandrel 171, wherein the opening 18 of the evacuable bag 14 is rolled around the mandrel 171 and the clip 170 compresses the portion of the evacuable bag 14 rolled about the mandrel in clamp seal engagement.

Referring back to FIG. 1, the storage device 10 further includes a vacuum conduit having one end in fluid communication with the interior of the storage space 22 and which includes a vacuum valve assembly 30. The vacuum valve assembly 30 is in fluid communication with the storage space 22 and defines a sealable passage through which liquids and/or gases may be drawn.

Referring to FIG. 9, in one embodiment the vacuum valve assembly 30 includes a base 31 having a flat surface 33 with at least one opening 37 there through, a resilient valve element 35, and an alignment device 39. The base 31 is sealingly engaged to the evacuable bag 14. The valve element 35 is generally flat and disposed adjacent to the flat surface 33. The alignment device 39 is coupled to the base 31 and is structured to bias the valve element 35 against the flat surface 33. The valve element 35 is structured to move between a first position, wherein the opening 37 is open, and a second position, wherein the opening 37 is sealed. The valve element 35 is normally biased to the second position. The base 31 has a defined shape, such as, but not limited to a concave disk. The outer surface 41 of the base 31 is a generally flat torus.

In one embodiment of the present disclosure, the vacuum valve assembly may be consistent with the valves disclosed in U.S. patent application Ser. No. 11/100,301 (Client Docket Number AVERP3868US), entitled “EVACUATABLE CONTAINER”, filed Apr. 6, 2005. It is noted that the sealing nature of the valve element 35 may be enhanced by incorporating a sealing material and/or a caulking composition into the sealing members of the valve assembly. In another embodiment, the vacuum valve assembly 30 may further include at least one rib (not depicted) extending from the interior side of the valve assembly base 31, wherein the rib extending from the base 31 ensures that the valve assembly is not obstructed during application of the vacuum.

As shown in FIGS. 1, 10a-10c, 11a-11d, and 15, the storage device 10 further includes a stand-off structure 70. The stand-off structure 70 provides a communicating passage for the removal of liquids and gases. This is, preferably, a strip 71 of film having a pattern of channels 72 embossed, or cut, therein. The stand-off structure channels 72 are designed not to collapse even when the bag 14 is placed under a vacuum. The channels 72 may be in any shape, such as, but not limited to a honeycomb pattern (FIG. 10a), a grid or partial grid (FIG. 10b), a series of parallel grooves (FIG. 10c) or a series of triangular columns (FIG. 11c). Referring to FIG. 15, the cavity face 85 of the stand-off structure 70 faces the valve assembly 30 and the protrusion face 86 of the stand-off structure 70 faces the storage space 22.

The honeycomb pattern of channels is depicted in isometric view in FIG. 11a, in which the channels 72 that provide the communicating passage for the removal of liquids and gases is defined by a series of polyhedron structures 100. Referring now to FIG. 11b, in another embodiment of the stand-off structure 70, the pattern of channels 72 for the removal of liquids and gasses may be provided by a series of curvilinear columns 120.

Regardless of the geometry selected for providing the channels, the stand-off structure 70 produces a passage for the removal of liquids and gases by providing a cross-section with a series of raised surfaces and recessed surfaces. In one embodiment, the standoff structure is integral with a fluid conduit providing fluid communication between the interior of the storage device and a vacuum system by which the storage device is evacuated, and which comprises a vacuum valve, the standoff structure, optionally a quick-connect device, optionally a liquid/vapor separator and the suction side of a vacuum pump. Referring to FIG. 12a, channels 72 are provided in the area defined between the raised surfaces 74 and recessed surfaces 75 of the stand-off structure's 70 cross-section. The stand-off structure 70 may have a series of channels 72 on one side of the standoff structure 70, as depicted in FIG. 12a, or on both sides of the stand-off structure 70, as depicted in FIG. 12b. Referring to FIG. 11c, in one embodiment of the present disclosure, the cavity face 85 of the stand-off structure 70 comprises channels 72 and the protrusion side 86 comprises a series of communicating passages produced by a plurality of polyhedron structures.

As shown in FIGS. 13a-13d, 14 and 15, the stand-off structure 70 may be bonded to the inner side of the bag 14, on the same side of the evacuable bag 14 as the valve assembly 30. Although thermal bonding of the stand-off structure 70 to the side of the evacuable bag 14 is preferred, any conventional bonding method may be utilized as known by those skilled in the art. The stand-off structure 70 is positioned at a location corresponding to the location of the vacuum valve assembly 30. Multiple valve assemblies 30 and multiple stand-off structures 70 may be utilized in a single storage device 10, as depicted in FIG. 13d.

As shown in FIG. 13a, the coupling of the stand-off structure 70 may be accomplished prior to folding over the plastic sheet 16, wherein the entire side periphery 73 of the stand-off structure is bound to the plastic sheet 16. Referring to FIG. 13b, in another embodiment, the coupling of the stand-off structure 70 to the storage device 10 may be accomplished by bonding only selected portions of the stand-off's side periphery 73 to the plastic sheet 16. Additionally, as opposed to limiting the stand-off structure 70 to a single side of the storage device 10, the stand-off structure 70 may be coupled to extend across both sides of the bag 14, as shown in FIG. 13c. In another example, the stand-off structure 70 may be positioned to extend diagonally across the plastic sheet as depicted in FIG. 13d. It is noted that examples depicted in FIGS. 12a-12d have been provided for illustrative purposes and that other configurations in the positioning of the stand-off 70 are within the scope of the present disclosure, so long as the stand-off 70 is positioned to be in fluid communication with the vacuum valve assembly 30 in a manner that allows for the removal of liquids and gasses from the storage device 10.

FIG. 14 depicts the positioning of the stand-off structure 70 once the plastic sheet 16 is folded over upon itself and two lateral sides 15 are sealed adjacent to the periphery forming the storage space 22. The stand-off structure 70 is clearly depicted as being bound to the face of the plastic sheet 16 within the storage space 22, wherein the channels 72 of the stand-off structure 70 face the surface of the plastic sheet 16 to which the stand-off structure 70 is bound. In an alternate embodiment, the stand off structure 70 may include channels 72 on both sides of the stand off structure 70 (FIG. 12b), in which the channels on a first side of the stand off structure 70 face the surface of the plastic sheet 16 to which the stand-off structure 70 is bound and the channels 72 on the second side of the stand off structure 70 face the opposing plastic sheet.

FIG. 15 illustrates the cross-section of the storage device 10 depicted in FIG. 14 along reference line 15-15, in which the channels 72 of the stand-off structure 70 are clearly depicted as facing away from the storage space 22 and towards the vacuum valve assembly 30 as well as the surface of the plastic sheet 16 to which the stand-off structure 70 is bound. Prior to the application of a vacuum, the portion of the stand-off structure 70 opposing the valve assembly 30 may be separated from valve assembly 30 by a distance D1 ranging from about 0.003″ to about 0.25″.

In one application, a vacuum pump is attached to the vacuum conduit which includes at least one vacuum valve and in fluid communication therewith, at least one standoff structure. The vacuum pump is operated, applying a vacuum to the interior of the storage device through the vacuum valve assembly 30 and standoff assembly causing the storage space 22 to collapse upon a food article contained therein. During the application of the vacuum, the stand-off structure 70 separates the food article from the vacuum valve assembly 30, ensuring that the food article does not obstruct the flow of air or liquids to be removed from the storage space 22, and insuring that the walls of the storage device conform tightly to the food article. Additionally, as the vacuum causes the portion of the plastic sheet 16 opposing the stand off structure 70 to collapse upon the raised portions of the stand-off structure 70, any remaining liquid and air may be removed via the stand-off structure's 70 recessed channels. During the application of the vacuum, the distance D1 separating the valve assembly 30 from the opposing raised surfaces of the stand-off structure 70 may be substantially eliminated while maintaining an effective passageway for removing the remaining air and liquids from the storage device through the stand-off structure's 70 recessed channels.

It will be appreciated that the resealable closure structure 20, shown in FIG. 1, may be operated by hand, however, as shown in FIGS. 1, 16a and 16b, the resealable closure 20 may also include a closing clip 80 and end clips 82. The closing clip 80 is a rigid U-shaped member 84 structured to fit snugly over at least the first and second side protrusions 54, 56, 58. The U-shaped member 84 is structured to bias the male protrusion 54 into the groove 60 formed by the other protrusions 56, 58 as the U-shaped member 84 is moved over the protrusions 54, 56, 58. In the embodiments of the present disclosure incorporating multiple protrusions, the U-shaped member 84 may be structured to also fit snugly over multiple protrusions 62, 64, wherein the U-shaped member also biases at least one additional male protrusion 62 into at least one additional groove formed by the other protrusions 64. The closure clip 80 functions to ensure that the interlocking profiles 21 are engaged as the clip 80 is disposed along a first direction, but does not affect the engagement of the interlocking profiles 21 when disposed along the direction opposite to that of the first direction. More specifically, the closure clip 80 does not separate the interlocking profiles when being traversed over engaged interlocking profiles 21. The end clips 82 are bonded to the ends of the resealable closure 20 and arrest the motion of the closing clip as it traverses the bag 14. The cross-section of an end clip is depicted in FIG. 17.

As mentioned above, in one embodiment the reclosable storage device comprises a portion of a system which includes a vacuum device having a low pressure side attached to a vacuum conduit which is in fluid communication with the interior of the storage device and which conduit includes a vacuum valve (described above). Optionally, the assembly includes also a quick-disconnect means in the vacuum conduit between the vacuum pump and the storage device and optionally includes a gas/liquid separator means in the vacuum conduit between the suction side of the vacuum pump and the storage device.

As will be appreciated, any number of vacuum devices can be utilized to evacuate a reclosable storage device in accordance with the present disclosure, however, in some embodiments it is preferred to employ a hand-held or portable vacuum pump. An example of one suitable portable device is illustrated in FIG. 21. The portable vacuum pump assembly illustrated in FIG. 21, pump 40, includes a power source, such as a battery, a vacuum pump having a suction side and an exhaust side, and a motor, (all not shown). The vacuum pump may be connected to the fluid conduit connected to the interior of the storage device by a quick-connect means, wherein one portion of the quick-connect means is integral with the vacuum pump assembly and another portion of the quick-connect means is integral with the flexible storage device.

An example of this is illustrated in FIG. 1 as engagement end 42 of vacuum pump 40. As illustrated, engagement end 42 has a defined shape, for example, a convex disk, concave disk or a disk shaped to fit within the medial opening of the outer surface of a vacuum valve assembly's defining one end of a fluid conduit associated with a storage device. The engagement end 42 has a defined shape structured to engage the vacuum valve assembly 30 and defines a passage that is in fluid communication with the vacuum pump 40. Thus, the engagement end of the portable vacuum pump 40 may function as a quick-connect means, for example, as illustrated in FIGS. 18(a) and 18(b) a suction cup tip 160, in which the suction cup tip 160 incorporates integrated stand off structures 161 to maintain suction during application of the vacuum, as depicted in FIGS. 18(a) and 18(b).

Other quick-connect means, for example, vacuum tips (engagement end 42) have been contemplated and are within the scope of the present disclosure, so long as the engagement end 42 geometry provides a quick connect engagement with the vacuum valve assembly. A “quick connection engagement” requires sealing of the valve assembly 30 and engagement end 42 without separate fasteners or the removal of separable sealing members. It will be appreciated that the system may also utilize more conventional coupling means to join the vacuum system to the fluid conduit to provide fluid communication between the suction side of the vacuum pump and the interior of the storage device.

As shown in FIGS. 19 and 20, the assembly may also include a liquid separator assembly 90. The liquid separator assembly 90 is structured to collect a liquid, while allowing gases to be drawn into the suction side of the vacuum pump assembly 40. In one embodiment, the liquid separator assembly 90 includes a tube 92, and accumulator housing 94 and a diverter 96. The tube 92 further includes a base 98 structured to sealingly engage both the attachment end 42 and the accumulator housing 94. The accumulator housing 94 is shaped as a cup and is structured to contain a liquid. The diverter 96 is structured to engage the distal end of the tube 92 and redirect the fluid flow from an axial direction in the tube 92 into the accumulator housing 94. Thus, when assembled, the attachment end 42 is coupled to the lower side of the tube base 98 and the accumulator housing 94 is coupled to the upper side of the tube base 98. The diverter 96 is disposed at the distal end of the tube 92. Thus, there is a fluid passage from the attachment end 42 into the accumulator housing 94.

In operation, the portable vacuum pump 40 is structured to engage the vacuum conduit connected to the interior of the storage device, for example, as illustrated, the outer surface of the vacuum valve assembly 30. When the portable vacuum pump 40 is engaged and actuated the vacuum valve assembly 30 is actuated by the resultant pressure differential, the valve element 35 moves into the first position (described above) and the vacuum conduit passage is open and fluid (gas and liquid) is withdrawn from the bag 14 through the vacuum conduit into the suction side of the vacuum pump. The fluid may be both liquid and gas. When a separator assembly is present in the vacuum conduit, liquid and gas are drawn into the liquid separator assembly 90, the liquid contacts the diverter 96 and is deposited in the accumulator housing 94. Thus, the liquid is not drawn with the gas towards the vacuum pump. The gas is exhausted via the vacuum pump from the vacuum pump assembly 40. When the accumulator housing 94 needs to be emptied, a user may simply remove the tube 92 and base 98 allowing the liquid to drain from the vacuum pump assembly 40.

When a portable vacuum pump 40 is actuated, air is withdrawn from the storage space 22. Thus, as shown in FIG. 21, an item, such as a food article 1 shown in ghost, may be placed in a storage device 10. The stand-off structure 70 is structured to prevent the plastic sheet that forms the evacuable bag 14, or an item within the bag 14, from obstructing the vacuum valve assembly 30. That is, the channels 72 on the stand-off structure 70 provide a path for liquids and gases within the bag 14 to reach the valve assembly 30. In the embodiments of the present disclosure in which the stand-off assembly has channels positioned on both sides of the stand-off structure 70, the channels contacting the item contained within the bag ensures that liquids and gasses are not trapped between the stand-off structure 70 and the item contained within the storage space.

Referring now to FIGS. 22 and 23, another package embodiment is illustrated. Package 210 has a first side panel 212 and an opposite side panel 214 that are connected by side edges 215, 216, 218. For clarity herein, side edge 215 can be referred to as a bottom edge 215, Side panels 212, 214 and side edges 215, 216, 218 define a surrounding wall 213 with an interior 220 therebetween. Various other configurations of surrounding walls are known. Interior 220 is configured for receiving a food item or other items for storage within package 210.

At the top end of package 210, that is, the side of package 210 opposite bottom edge 215, a resealable zipper 250 is present. Zipper 250 is present across a mouth of package 210 that provides access to interior 220. Zipper 250 includes a first profile member 252 and a second profile member 254, wherein the first and second profile members 252, 254 are configured to engage and disengage with each other. In other words, first and second profile members 252, 254 are sealable and resealable. First profile member 252 is connected to first side panel 212 and second profile member 254 is connected to second side panel 214. Profile members 252, 254 could be integral with their respective side panel 212, 214 or could be attached thereto, for example, by a heat seal or adhesive. Zippers 250 and profile members 252, 254 are well known in the art. For example, see U.S. Pat. Nos. 6,524,002; 6,152,600; 5,839,831, and 5,252,281, each of which is incorporated herein by reference.

Referring to FIG. 22, package 210 includes a valve 230, positioned in side panel 212 to allow escape of air from interior 220 to the exterior of package 210. Valve 230 is preferably a one-way valve, allowing flow of fluid therethrough in only one direction; preferably, that direction is from interior 220 of package 210 to the exterior of package 210. The fluid to pass through valve 230 can be either or both gaseous or liquid. In most uses of package 210, the fluid passing through valve 230 will be air. Valve 230 can be any suitable valve, including those known as “Goglio” type or “Raackmann” type. Goglio-type valves are available, for example, from Bosch, Wipf and Wico; Raackmann-type valves are available, for example, from Amcor. Other examples of suitable valves 230 include those described in U.S. Pat. Nos. 6,913,803; 6,733,803; 6,607,764, and 6,539,691, each of which is incorporated herein by reference.

Package 210 also includes sealant stripe 270 present on the interior of at least one of side panels 212, 214. Sealant stripe 270 is preferably a peal seal, which can be sealed, readily opened, and resealed. Examples of peal seals include those described in U.S. Pat. Nos. 6,290,393; 6,210,038, and 6,131,248, each of which is incorporated herein by reference. Sealant stripes and resealable zippers may be generally referred to as “closures” useful for closing portions of a package or storage device.

One particular application for package 210 illustrated in FIGS. 22 and 23 is as a freezer bag. Package 210 includes a textured standoff area 280, which can be integral with each of side panels 212, 214. In other embodiments, textured standoff area 280 can be attached to a surface of panels 212, 214. Preferably, textured standoff area 280 is present on the interior of each of panels 212, 214. Such a textured standoff area 280 is beneficial for freezer bags, where it is desired to maintain a slight air gap or spacing between any items positioned within package 210 and side panels 212, 214.

Returning to package 210, in detail, various specific details of package will now be described. It is understood however, that the following descriptions are not limiting to features of package 210, with alternate materials, constructions, and the like could be used to provide a package according to the present disclosure.

Package 210 has side panels 212 and 214, which form the overall package 210. Side panels 212, 214 are flexible sheets, typically polymeric film. Examples of suitable films for use as panels 212, 214 are well known, and include polyethylene, polypropylene, and the like.

As provided above, side panels 212, 214 meet at bottom edge 215 and side edges 216, 218. Any or all of edges 215, 216, 218 may be seals or may be folds. In the embodiment illustrated in FIG. 23, bottom edge 215 is a fold between side panel 212 and side panel 214; that is, a sheet of material has been folded to form panels 212, 214 and bottom edge 215. Typically, in constructions having bottom edge 215 being a fold, side edges 216, 218 are sealed edges; that is, side panels 212, 214 are sealed to one another, for example by heat sealing. In other embodiments, side edge 216 is a folded edge and bottom edge 215 and side edge 218 are sealed. In yet another embodiment, each of side edges 216, 218 are folded and bottom edge 215 is sealed. Still further, embodiments of package 210 could have each of edges 215, 216, 218 being sealed. These various edge configurations are known in the art and any of these are suitable for package 210.

As provided above, zipper 250 has first profile 252 and second profile 254, which engage and disengage from each other to provide access to interior 20 of package 210. Profiles 252, 254 are constructed to be repeatedly sealed (e.g., closed, engaged, mated, etc.) and unsealed (e.g., opened, disengaged, unmated, etc.), for example, by pressure exerted by the user's fingers. In some embodiments, profiles 252, 254 are configured to provide an indication, for example by color change, when they are seal. Although not illustrated in FIG. 22 or 23, zipper 250 may be open and closed by a slider element, as are well known. See for example U.S. Pat. Nos. 6,679,027; Des. 480,988; Des. 479,467, and 6,450,686, each of which is incorporated herein by reference, for examples of suitable slider elements.

As provided above, sealant stripe 270 is present on the interior of at least one of panels 212, 214. In some embodiments, sealant stripe 270 is integral with or part of panel 212, 214. Alternately, sealant strip 270 may be present on a surface of side panel 212, 214; see FIG. 23 where sealing stripe 270 is illustrated as a piece of material adhered to each of panels 212, 214. Sealant stripe 270 allows panels 212, 214 to be sealed together, preferably with a fluid-impermeable or hermetic seal. Sealant stripe 270 preferably extends from side edge 216 to side edge 218, and may be any suitable width (taken in the direction from bottom edge 215 to zipper 250).

Package 210 preferably includes textured standoff area 280, particularly if package 210 is intended to be a freezer bag. By the term “freezer bag”, it is meant a package that is intended to be used for storing items at temperatures below 30° F., often at temperatures below 20° F. Such a textured standoff area 280 is beneficial for freezer bags, where it is desired to maintain a slight air gap or spacing between any items positioned within package 210 and side panels 212, 214, to inhibit freezer burn. Textured standoff area 280 is preferably present on each of panels 212, 214 and may occupy any area. For example, textured standoff area 280 may extend to any side edges 216, 18 or may stop short of edges 216, 218. Similarly, textured standoff area 280 may extend to bottom edge 215 or may stop short of bottom edge 215. The width of textured standoff area 280 (taken in the direction from bottom edge 215 to zipper 250) is usually at least 5 cm wide, and often at least 7.5 cm wide. Preferably, textured standoff area 280 is not present in the area of sealant strip 270. It is understood that the area of textured standoff area 280 will be dependent on the overall size of package 210 and side panels 212, 214.

Referring again to FIGS. 22 and 23, package 210 includes valve 230, which is positioned between zipper 250 and sealant stripe 270. An alternate embodiment of a package according to the present disclosure is illustrated in FIGS. 24-27, as package 210′. Package 210′ is similar to package 210 and that it includes first panel 212, second panel 214, bottom end 215, side edges 216, 218, valve 230, sealant stripe 270 and textured standoff region 280. Package 210′ differs from package 210, however, in that for package 210′, sealant stripe 270 is positioned between zipper 250 and valve 230. That is, valve 230 is positioned closer to interior 220 then to zipper 250. Valve 230 allows fluid, usually air, to pass from interior 220 of package 210, 210′ to the exterior, and inhibits air (or other fluid) from entering into interior 220.

FIG. 27 illustrates an example embodiment for zipper 250. Zipper 250 includes zipper profiles 252, 254 having posts 251, 253, lock members 255, 256, and zipper flanges or tabs 258, 259. Many other zipper configurations are possible for use with the packages 210, 210′. In some embodiments, the packages include at least one sealant stripe and no zipper for closing the package. For example, FIGS. 30 and 31 illustrate a package 510 that includes a sealant stripe 270 positioned at an end of the package opposite the bottom end 215. The package 510 includes a valve 230 in communication with an interior 220 of the package, and a standoff area 280 on opposing side panels 212, 214 of the package.

FIGS. 25 and 26 illustrate package 210′ in use, retaining an item 290 therein. Item 290 is illustrated as a food item, particularly, a chicken leg. To place item 290 in package 210′ (or in package 210), the general following procedure is followed. Zipper 250 is opened, if necessary, by unmating, unsealing, etc. first and second profiles 252, 254. Side panels 212, 214 are spread sufficiently far to place item 290 therebetween. Sometimes, it may be necessary to unseal sealant strip 270 to pass item 290 past stripe 270 toward bottom edge 215. Item 290 should be positioned between bottom edge 215 and sealant strip 270. In some embodiments, item 290 may be positioned in the area of textured standoff area 280, however, this is not necessary.

After positioning item 290 in package 210′, it is optional to push or otherwise urge air present in package 210′ out via zipper 250. Sealant stripe 270 is sealed, providing an air-tight seal across package 210′. Zipper 250 is also sealed, providing a seal across package 210′. It is understood that sealant stripe 270 may be sealed before or after zipper 250 is closed. When pressure is applied to package 210′ in an area between bottom edge 215 and sealant stripe 270, at least some of the air remaining in package 210′ is pushed through valve 230 and out from interior 220 of package 210′.

Due to the construction of package 210 of FIGS. 22 and 23, the order of steps for sealing an item 290 in package 210 may differ. For example, after positioning item 290 in package 210, it is optional to push or otherwise urge air present in package 210 out via zipper 250. Zipper 250 is then sealed, providing a seal across package 210. When pressure is applied to package 210 in an area between bottom edge 215 and zipper 250, at least some of the air remaining in package 210 is pushed through valve 30 and out from interior 220 of package 210. Sealant stripe 270 is sealed, providing an air-tight seal across package 210. Preferably, sealant stripe 270 is sealed after zipper 250 is closed and after the air has been evacuated from interior 220 of package 210.

Packages 210, 210′ may be made by generally any suitable process. For example, packages 210, 210′ may be made by a horizontal process (e.g., where the film forming side panels 212, 214 moves in a generally horizontal direction) or a vertical process (e.g., where the film forming side panels 212, 214 moves in a generally vertical direction). As mentioned above, any or all of edges 215, 216, 218 may be folds or seals between side panels 212, 214. Profile members 252, 254 may be attached to side panels 212, 214 before or after bottom edge 215 is formed. Similarly, a slider device (if present) may be applied to profile members 252, 254 before or after incorporation with side panels 212, 214. Packages 210, 210′ may include side gussets or gussets in panels 212, 214 to provide increased interiors 220. Various other configurations and methods of making packages 210, 210′ are suitable.

Referring now to FIGS. 28 and 29, another example package 310 in accordance with the present disclosure is illustrated. Package 310 has a first side panel 312 and an opposite side panel 314 that are connected by side edges 315, 316, 318. For clarity herein, side edge 315 can be referred to as a bottom edge 315. Side panels 312, 314 and side edges 315, 316, 318 define a surrounding wall 313 with a storage interior 320 therebetween. Seal 370 also defines a portion of storage interior 320; seal 370 is described below. Various other configurations of surrounding walls 313 are known and are useable in accordance with the principles of this disclosure. Storage interior 320 is configured for receiving a foodstuff item 390 or other item(s) for storage within package 310. In FIGS. 28 and 29, food item 390 is a collection of small food items, such as shredded cheese, meats, fruits, or vegetables.

In the one depicted in the drawings, at the top end of package 310, that is, the side of package 310 opposite bottom edge 315, is top edge 335. A surrounding wall 330 is defined by first side panel 312, second side panel 314, side edges 316, 318, top edge 335 and by seal 370.

Present within the interior formed by surrounding wall 330 is a resealable zipper closure 350. Zipper closure 350 extends from side edge 316 to side edge 318, and includes a first zipper profile 354 having a first profile member and a second zipper profile 352 having a second profile member; wherein the first and second zipper profiles 354, 352 are configured to engage and disengage with each other. In other words, first and second zipper profiles 354, 352 are selectively sealable and resealable.

In the embodiment shown, first zipper profile 354 is connected to first side panel 312, and second zipper profile 352 is connected to second side panel 314. Zipper profiles 354, 352 could be integral with their respective side panel 312, 314 or could be attached thereto, for example, by a heat seal or adhesive. Zippers 350, zipper profiles 354, 352 and profile members are well-known in the art, and a variety of configurations are useable in accordance with the principles of this disclosure. For example, see U.S. Pat. Nos. 6,524,002; 6,152,600; 5,839,831, and 5,252,281, each of which has been incorporated herein by reference. In the one shown, zipper closure 350, at each side edge 316, 318, includes a crush area 410, where zipper profiles 354, 352 are sealed together and may be partially crushed or deformed.

At top edge 335, package 310 includes header 336, which extends between top edge 35 and zipper closure 350 and forms a portion of surrounding wall 330. In this particular embodiment, header 336 is detachable from package 310 via weakness 360. Weakness 360 may be a perforation, a tear-strip, string or thread, a laser scope, a die line, a thinner area, or other configuration that allows header 336 to be removed from side panels 312, 314. Header 336 is an element that provides a quick indication whether or not access has been gained to zipper closure 350. That is, access is not readily gained to the interior of surrounding wall 330, which has zipper closure 350 therein, without breaching header 336 or side panels 312, 314. To gain access to zipper closure 350, header 336 is removed via weakness 360.

As mentioned above, package 310 includes seal 370, which is positioned between bottom edge 315 and top edge 335, and partially defines storage interior 320 of surrounding wall 313 and the interior of surrounding wall 330. Seal 370 is present on the interior of at least one of side panels 312, 314 and allows panels 312, 314 to be sealed together, preferably with a fluid-impermeable or hermetic seal. Seal 370 may be a repeatably reclosable seal or a one-time seal, such as an adhesive seal or a mechanical seal. Additional details regarding seal 370 are provided below.

Package 310 includes a valve 330, positioned in one of side panels 312, 314 to allow escape of air, gas or other fluid from storage interior 320 to the exterior of package 310; in FIG. 29, valve 330 is illustrated in side panel 312. Valve 330 is preferably a one-way evacuation valve, allowing flow of fluid therethrough in only one direction; preferably, that direction is from storage interior 320 of package 310 to the exterior of package 310. The fluid to pass through valve 330 can be either or both gaseous or liquid. In most uses of package 310, the fluid passing through valve 330 will be air. Valve 330 can be any suitable valve, such as those described above for valve 230. Valve 330 may be a manually activated valve or may be configured for use with an external device, such as the vacuum pump described above with reference to resealable storage device 10.

Located in close proximity to valve 330 is a textured standoff material 380. Standoff material 380 can extend from zipper closure 350, typically from one of zipper profiles 354, 352; in FIG. 29, standoff material 380 extends from an end of zipper profile 354, forming a skirt-like construction 355. It is also foreseen that standoff material 380 may be positioned on, or integral with, a side of zipper profiles 354, 352, (for example, positioned in an area close to where the zipper profile members are), rather than extending away from an end of the profile. Textured standoff material 380 has at least one surface, preferably the one closest to valve 330, that is textured, for example, with protrusions, dots, bumps, detents, grooves, etc., or other structures that provide a surface that is not smooth. Generally, the textured features of standoff material 380 are at least 0.01 mm high, often at least 0.05 mm high, for example, about 0.1 mm high, or more, such as about 0.5 mm high or even 1 mm high. Such a textured standoff material 380 is desirable in package constructions to maintain a slight air gap or spacing between zipper members 354, 352 and valve 330, to inhibit valve 330 being blocked by zipper profiles 354, 352 or by side panel 314, so that air, gas or other fluid can pass through valve 330.

Returning to package 310, in detail, various specific details of package 310 will now be described. It is understood however, that the following descriptions are not limiting to features of package 310; alternate materials, elements, configurations, constructions, and the like, such as the configuration package 210, could be used.

Package 310 has side panels 312 and 314, which form the overall package 310. Side panels 312, 314 are flexible sheets, typically polymeric film. Examples of suitable films for use as panels 312, 314 are well known, and include polyethylene, polypropylene, and the like. Laminated materials may also be used, which can include, but are not limited to, low density polyethylene (LDPE) and nylon or LDPE and polypropylene.

As provided above, side panels 312, 314 meet at bottom edge 315, side edges 316, 318 and top edge 335. Any or all of edges 315, 316, 318, 335 may be seals or may be folds. In the embodiment illustrated in FIG. 29, bottom edge 315 is a seal between side panel 312 and side panel 314 and top edge 335 is a seal between side panel 312 and side panel 314. Side edges 316, 318 could be either seals or folds. For example, one piece of material could be folded to form panels 312, 314, thus forming one folded side edge and one sealed side edge. In an alternate configuration, a tube of material can be used, thus forming two folded side edges. Still further, package 310 could have each of edges 315, 316, 318, 335 being sealed. These various edge configurations are known in the art and any of these are suitable for package 310.

As provided above, zipper closure 350 has first zipper profile 354 and second zipper profile 352, which engage and disengage from each other to provide access to storage interior 320 of package 310. Profiles 354, 352 are constructed to be repeatedly sealed (e.g., closed, engaged, mated, etc.) and unsealed (e.g., opened, disengaged, unmated, etc.), for example, by pressure exerted by the user's fingers. In some embodiments, zipper profiles 354, 352 are configured to provide an indication, for example by color change, when they are sealed. Although not illustrated in FIG. 28 or 29, zipper closure 350 may be opened and closed by a slider element, as is well known. See for example U.S. Pat. Nos. 6,679,027; Des. 480,988; Des. 479,467, and 6,450,686, each of which is incorporated herein by reference, for examples of suitable slider elements.

As provided above, seal 370 is present on the interior of at least one of panels 312, 314. Seal 370 allows panels 312, 314 to be sealed together, preferably with a fluid-impermeable or hermetic seal. Seal 370 preferably extends from side edge 316 to side edge 318, and may be any suitable width (taken in the direction from bottom edge 315 to zipper closure 350). Seal 370 can be a material, e.g., adhesive, applied to a surface of panel(s) 312, 314 or seal 370 may be integral with or formed by panel(s) 312, 314.

Seal 370 may be a repeatably reclosable seal or a one-time seal, such as an adhesive seal or a mechanical seal that is not reclosable. For example, seal 370 may be an adhesive peal seal, which can be sealed, readily opened, and resealed. Examples of peal seals include those described in U.S. Pat. Nos. 6,290,393; 6,210,038, and 6,131,248, each of which is incorporated herein by reference. Seal 370 may alternately be a non-resealable adhesive peal, that is, a seal that, once broken, cannot be resealed.

Still further, seal 370 may be a mechanical connection between panels 312, 314 formed, for example, by a melting and joining of their materials, due to the application of heat and pressure in the area. Seal 370 could alternately be a physical or mechanical interaction, such as a sealed formed by material that separates or delaminates between layers, and cannot be resealed. Examples of non-resealable seals include those described in U.S. Pat. No. 6,004,032, which is incorporated herein by reference.

Package 310 preferably includes textured standoff material 380 in locations where it is desired to maintain a slight distance, gap or spacing, for example, such as against valve 330. Textured standoff material 380 is preferably present on any element of package 310 that might inhibit flow through valve 330. In the embodiment illustrated in FIG. 29, standoff material 380 is connected to zipper profile 354; standoff material 380 could be integral with or sealed to zipper profile 354. Textured standoff material 380 could alternately be positioned in or on side panel 314 or other portion of package 310 that might inhibit flow through valve 330.

Textured standoff material 380 may extend the width of package 310 from side edges 316, 318, as illustrated in FIG. 28, or may stop short of edges 316, 318. Textured standoff material 380 could be present only in the area proximate to valve 330.

The Figures illustrate unopened package 310 retaining food item 390 therein. Package 310, as illustrated, is unopened, because heater 335 remains intact.

Package 310, with food item 390 therein, is produced by processes often referred to as “form fill and seal”. In these processes, the package, particularly storage interior 320, is manufactured (i.e., formed), the item is placed within storage interior 320 (i.e., filled), and then any last seals, such as bottom edge 315, are made (i.e., sealed). “Form fill and seal” will be referred to as “FFS” hereinafter. Package 310 may be made by a horizontal FFS process (e.g., where the film forming side panels 312, 314 and zipper closure 350 move in a generally horizontal direction) or a vertical FFS process (e.g., where the film forming side panels 312, 314 and zipper closure 350 move in a generally vertical direction). Typically, with horizontal FFS processes, the unfilled package 310 progresses through the process up-side-down. That is, bottom edge 315 is positioned above top edge 335. With vertical FFS process, the unfilled package progresses either up-side-down or sideways.

In one embodiment of a horizontal FFS process, two extended lengths of the film, each forming a side panel 312, 314, move in a generally horizontal direction. An extended length of zipper closure 350 may be attached to side panels 312, 314, before, after, or concurrently with the film being sealed together to form top edge 335. Standoff material 380 can be attached to zipper closure 350 prior to zipper closure 350 being attached to side panels 312, 314. Valve 330 will typically be installed into one of the extended lengths of film at predetermined intervals, to correspond to one valve 330 per package 310. Seal 370 can be formed between side panels 312, 314 before, after, or concurrently with edge 335 being formed or with zipper closure 350 being attached. Weakness 360 may be formed close to edge 335 either after edge 335 has been sealed or before.

After the various elements have been joined to form an extended length, seals, which will result in side edges 316, 318, are made. Crush areas 410 are usually made simultaneously with these side edge seals, but could be made in a separate step. After storage interior 320 has been made (i.e., between side panels 312, 314 having side edges 316, 318, seal 370), food item 390 is placed, for example, dropped, into storage interior 320, and then bottom edge 315, which is positioned above the rest of package 310, is sealed.

In an alternate embodiment of a horizontal FFS process, one extended length of film moves in a generally horizontal direction. This film is folded to form both panels 312, 314 with folded edge 335 therebetween. Any order of applying zipper closure 350, standoff material 380, valve 330, seal 370 and weakness 360 can be used. Similar to the first embodiment, after the various elements have been joined to form an extended length, side edges 316, 318 and crush areas 410 are made. Food item 390 is placed into storage interior 320, and then bottom edge 315 is sealed.

In one embodiment of a vertical FFS process, two extended lengths of film, each forming a side panel 312, 314, move in a generally vertically downward direction. Similar to above, an extended length of zipper closure 350 may be attached to side panels 312, 314, before, after, or concurrently with the film being sealed together to form top edge 335. Standoff material 380 can be attached to zipper closure 350 prior to zipper closure 350 being attached to side panels 312, 314. Valve 330 will typically be installed into one of the extended lengths of film at predetermined intervals, to correspond to one valve 330 per package 310. Seal 370 can be formed between side panels 312, 314 before, after, or concurrently with edge 335 being formed or with zipper closure 350 being attached. Weakness 360 may be formed close to edge 335 either after edge 335 has been sealed or before. Bottom seal 315 can also be formed at any stage in this process.

After the various elements have been joined to form an extended length, a seal, which results in, for example, side edge 318 and a crush area 410, is made. After this step, storage interior 320 has been made between side panels 312, 314, edge 315, seal 370 and side edge 318; see FIG. 29, which is representative of a top view of the package during such as vertical FFS process. Food item 390 is placed, for example, dropped, into storage interior 320, and then side edge 316, which is positioned above the rest of package 310, is sealed. Such a FFS process moves in a generally downward vertical direction.

In an alternate embodiment of a vertical FFS process, one extended length of film moves in a generally horizontal direction. This film is folded to form both panels 312, 314 with folded edge 335 or edge 315 therebetween. Any order of applying zipper closure 350, standoff material 380, valve 330, seal 370 and weakness 360 can be used. Similar to the first embodiment, after the various elements have been joined to form an extended length, side edge 318 and crush areas 410 are made. Food item 390 is placed into storage interior 320, and then side edge 316 is sealed. Alternately, a tube of film could be used, thus resulting in two folded edges 315 and 335.

Prior to use, the consumer removes header 336 via weakness 360. To gain access to storage interior 320, zipper profiles 354, 352 are separated and seal 370 is breached, which allows access to item 390.

To close package 310, it is preferred to remove air from interior 320, for example by flattening package 310 prior to mating zipper profiles 354, 352. After zipper closure 350 is closed, additional air can be removed from interior 320 via valve 330. The air may be manually forced through valve 330, for example, by hand pressure or other squeezing applied to the region between edge 315 and zipper closure 350, or may be attached to an external device, such as a vacuum pump. After removal of the desired air, gas or fluid, seal 370 may be resealed, if so configured. Removal of air, gas or fluid from interior 320 decreases the opportunity for spoilage of food item 390 and extends its life. When seal 370 is resealed, it provides an air-tight seal across package 310. Zipper closure 350 is also sealed, providing a seal across package 310.

As mentioned above, any or all of edges 315, 316, 318, 335 may be folds or seals between side panels 312, 314. A slider device (if present) may be applied to zipper profiles 354, 352 before or after incorporation with side panels 312, 314. Package 310 may include side gussets or gussets in panels 312, 314 to provide increased volume for interior 320. Various other configurations and methods of making package 310 are suitable.

The above specification, examples and data provide a complete description of the manufacture and use of the composition of the present invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.

Claims

1-40. (canceled)

41. A method comprising:

attaching a vacuum valve to at least one of a first polymeric material and a second polymeric material, wherein the vacuum valve is configured to accommodate a vacuum pump for removal of fluids from a storage bag produced from the first polymeric material and the second polymeric material;

coupling a stand-off structure to at least one of the first polymeric material and the second polymeric material, wherein the stand-off structure is configured to facilitate removal of fluids from the storage bag via the vacuum valve;

integrating a closure comprising opposed interengaging profile members with at least one of the first polymeric material and the second polymeric material, wherein the opposed interengaging profile members are capable of repeated engagement and disengagement;

placing a product in contact with at least one of the first polymeric material and the second polymeric material; and

sealing the first polymeric material and the second polymeric material such that the storage bag is produced and the product is sealed within a storage space of the storage bag.

42. The method of claim 41, wherein the first polymeric material and the second polymeric material comprise a single sheet of polymeric material.

43. The method of claim 41, wherein the first polymeric material is a first sheet of polymeric material and wherein the second polymeric material is a second sheet of polymeric material separate from the first sheet of polymeric material.

44. The method of claim 41, further comprising:

opening the storage bag via the closure;

removing at least a portion of the product from the storage space;

resealing the storage bag via the closure;

removing gas from the storage space via the vacuum valve and the vacuum pump.

45. The method of claim 41, wherein the sealing step comprises:

before the placing step, first sealing a first portion of at least one of the first polymeric material and the second polymeric material, thereby producing at least a portion of the storage space; and

after the placing step, second sealing the first polymeric material and the second polymeric material to seal the product in the storage space of the storage bag.

46. The method of claim 41, wherein stand-off structure is a strip of polymeric material, wherein the strip of polymeric material has a series of channels on a first side thereof.

47. The method of claim 46, wherein after the sealing step the channels face the vacuum valve.

48. The method of claim 46, wherein after the sealing step the channels face away from the vacuum valve.

49. The method of claim 46, wherein the coupling step includes coupling only a portion of the strip of polymeric material to the storage bag.

50. The method of claim 41, further comprising:

producing a first chamber and a second chamber within storage bag, wherein after the sealing step the first chamber is fluidly isolated from the second chamber, and wherein after the sealing step the first chamber comprises the food item and the second chamber comprises the vacuum valve.

51. The method of claim 50, wherein the closure is a first closure, and wherein the producing step comprises:

integrating a second closure with at least one of the first polymeric material and the second polymeric material, wherein after the sealing step the second closure fluidly separates the vacuum valve from the product.

52. The method of claim 51, wherein the integrating step comprises:

forming a peel seal within the storage bag.

53. The method of claim 51, wherein the forming step occurs before at least a portion of the sealing the first polymeric material and second polymeric material steps.

54. The method of claim 51, wherein the forming step occurs after the sealing the first polymeric material and second polymeric material steps.

55. The method of claim 51, wherein the second closure is a second pair of interengaging profile members, and wherein the integrating a second closure step occurs before the sealing the first polymeric material and second polymeric material steps.

56. The method of claim 51, further comprising

opening the first closure;

opening the second closure, thereby providing access to the product;

removing at least a portion of the product from the storage space;

resealing the storage bag via the first closure;

removing gas from the storage space via the vacuum valve and the vacuum pump.

57. The method of claim 41, further comprising:

placing a grease composition along a substantial portion of the closure.

58. The method of claim 57, wherein the placing the grease composition step occurs before the integrating a closure step.

59. The method of claim 41, further comprising:

completing all of the attaching, coupling, integrating, placing, and sealing steps occur at a single location.

60. The method of claim 59, wherein the single location is a manufacturing facility.

61. The method of claim 41, further comprising:

completing the attaching, coupling and integrating steps at a first location; and

completing the placing and sealing steps at a second location.

62. The method of claim 41, wherein the product is a food product.

63. The method of claim 41, wherein the product is a non-food product.

64. The method of claim 41, wherein the first polymeric material is a first film, and wherein the second polymeric material is a second film.