Infestation resistant reclosable seal
A container has a reclosable zipper seal. The zipper comprises a pair of interlocking sections attached to respective portions of the container. The interlocking sections are secured to portions of the container by an adhesive. No sewing is used to secure the interlocking sections to the sides of the container. The adhesive may provide a significant resistance to permeation by organisms or other contaminants. The adhesive sealing of the interlocking sections to the container may thus provide a significant resistance of the container to exogenous infestation. Alternatively, the interlocking sections may comprise a plastic material such that upon the interlocking sections being sewn to the container, the container may be appreciably resistant to exogenous infestation. Where a gusseted bag is used, portions of the gussets may be adhesively sealed, such as through external application of an adhesive or by applying heat to a heat-sealable outer ply of the bag.
Reclosable seals are used in a variety of applications, one example being for sealing the opening of a bag. A variety of reclosable seals currently exist, but no one prior to the inventors has created or used the invention described in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGSWhile the specification concludes with claims that particularly point out and distinctly claim the invention, it is believed the present invention will be better understood from the following description taken in conjunction with the accompanying drawings, in which like reference numerals identify the same elements. The drawings and detailed description which follow are intended to be merely illustrative and are not intended to limit the scope of the invention as set forth in the appended claims.
The following description should not be used to limit the scope of the present invention. Other examples, features, aspects, embodiments, and advantages of the invention will become apparent to those skilled in the art from the following description, which includes by way of illustration, one of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other different and obvious aspects, all without departing from the invention. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive. It should therefore be understood that the inventors contemplate a variety of embodiments that are not explicitly disclosed herein.
As used herein, terms such as “right,” “left,” “above,” “below,” and the like are used simply to refer to the relative positioning of elements in the drawings, and are not intended to be limiting in any way. While the present example includes a bag (30), it will be appreciated that zipper (10) or any other reclosable seal may be used on any other type of container or receptacle, including but not limited to envelopes, pouches, sacks, and the like. As used herein, the terms “container” and “receptacle” shall be read to include anything configured to hold and contain an object or materials. To the extent that the container is a bag, it will be appreciated that any type of bag may be used, including but not limited to gusseted, non-gusseted, paper, plastic, multi-laminate, woven polypropylene bags, and the like. In one embodiment, the container comprises a bag (30) having a plurality of layers, with at least one of the layers being a paper material, and at least one other layer (e.g., the outer layer) being a heat-sealable material. Other suitable containers, materials, and configurations will be apparent to those of ordinary skill in the art.
It will be appreciated that interlocking sections (12, 14) of zipper (10) may be secured to bag (30) in any suitable fashion. In one embodiment, interlocking sections (12, 14) are secured to bag (30) by a pre-applied, heat-activated adhesive. Such adhesive may be activated by hot air, by hot rolling, or by any other suitable method. In another embodiment, interlocking sections (12, 14) are secured to bag (30) by an epoxy bond. In this embodiment, a first compound is applied to each interlocking section (12, 14) and a second compound is applied to the portions of bag (30) that will ultimately come into contact with interlocking sections (12, 14). The first and second compounds are configured such that, when joined together, the compounds form a physical bond. Accordingly, a bond is formed when interlocking sections (12, 14) are placed in contact with the aforementioned portions of bag (30), thereby securing interlocking sections (12, 14) to bag (30). Alternatively, any other technique may be used to secure interlocking sections (12, 14) to bag (30), including but not limited to heat-sealing, stitching, adhesives, press-sealing, cold welding, pressure bonding, double-sided tape. Where interlocking sections (12, 14) are stitched to bag (30), it will be appreciated that such stitching may include, by way of example only, sewing or ultrasonic stitching. Still other suitable techniques for securing interlocking sections (12, 14) to bag (30) will be apparent to those of ordinary skill in the art.
It will be appreciated that the potential for infestation of bag (30) by insects, larvae, or other undesirable organisms or materials is an issue that may need to be addressed. In addition to the prospect of the mere presence of organisms and other contaminants in bag (30) being undesirable, such organisms or other contaminants may adversely affect the other contents of bag (30) (e.g., by eating the contents of bag (30)) or the bag (30) itself (e.g., by boring through bag (30)). Infestation may arise within bag (30) by organisms or contaminants that are introduced into bag (30), such as during filling (“endogenous infestation”). In addition, or alternatively, infestation may arise when organisms or contaminants penetrate bag (30), the interface between bag (30) and interlocking sections (12, 14), or elsewhere (“exogenous infestation”). For instance, with some bags (30) where interlocking sections (12, 14) are secured to bag (30) by mere sewing, it may be possible for organisms such as larvae to infest bag (30) by entering through the interface between interlocking sections (12, 14) and bag (30). That is, the sewing of interlocking sections (12, 14) to bag (30) may provide an insufficient seal at the interface of interlocking sections (12, 14) and bag (30), such that the interface provides undesirable permeability for exogenous infestation. Other features and components of bag (30), including features relating to interlocking sections (12, 14), which may provide permeability for exogenous infestation will be apparent to those of ordinary skill in the art.
In one embodiment, interlocking sections (12, 14) are secured to bag (30) with an adhesive to significantly reduce the likelihood of, if not prohibit, exogenous infestation at the interface between interlocking sections (12, 14) and bag (30). In addition, an adhesive is used to seal the portions of gussets of bag (30) that are proximate to interlocking sections (12, 14). In this embodiment, no sewing is used to secure interlocking sections (12, 14) to bag (30). For this embodiment, any type of adhesive may be used, including but not limited to an epoxy, a heat activated adhesive (e.g., as a heat sealable ply on bag (30)), a pressure sensitive adhesive, a liquid adhesive, or any other type of adhesive. It will be appreciated that the use of such adhesive, particularly where no sewing is used to secure interlocking sections (12, 14) to bag (30), may greatly reduce, if not eliminate altogether, the likelihood of exogenous infestation via the interface between interlocking sections (12, 14) and bag (30).
In another embodiment, interlocking sections (12, 14) comprise a plastic material, and are secured to bag (30) through sewing. For instance, each interlocking section (12, 14) may be sewn individually to bag (30). Alternatively, interlocking sections (12, 14) may both be sewn to bag simultaneously (e.g., with the same thread). Other ways of sewing interlocking sections (12, 14) to bag (30) will be apparent to those of ordinary skill in the art. It will be appreciated that, in this embodiment, the resilience of the plastic material surrounding the sewn stitching thread may provide appreciable exogenous infestation resistance, such as by creating a relatively snug fit of interlocking sections (12, 14) about the sewn thread. In other words, the plastic material of interlocking sections (12, 14) may provide better exogenous infestation resistance than a bag (30) where interlocking sections are made of a cloth or paper material. Of course, were interlocking sections (12, 14) are sewn or otherwise stitched or secured to bag, an additional adhesive may be applied between each interlocking section (12, 14) and the respective adjacent portions of bag (30). It will also be appreciated that, as in any other embodiment described herein, an adhesive may be used to seal the portions of the gussets of bag (30) that are proximate to interlocking sections (12, 14). For instance, and without limitation, an adhesive may be applied to the outside of the gussets to provide this seal. Alternatively, where bag (30) comprises a plurality of layers, with the outer layer being heat-sealable, heat may be applied to gussets to provide the seal. It will be appreciated that gusset portions may be sealed in a variety of alternative ways. It will also be appreciated that resistance to exogenous infestation may be provided in a variety of alternative ways, and to a variety of degrees.
In the present example, interlocking sections (12, 14) comprise an extruded plastic material. Of course, interlocking sections (12, 14) may be formed of any other suitable material, and by any other suitable process. Respective ends (18, 20) of interlocking sections (12, 14) may be secured together by any suitable technique, including but not limited to a hot knife, hot glue, other adhesives, heat sealing, stitching, cold welding, pressure bonding, hooks, tape, clamps, rivets, or any other suitable technique or device.
It will be appreciated that zipper (10) is operable to seal bag (30). In the present example, such sealing occurs upon closure of zipper (10) by engagement of right interlocking section (12) with left interlocking section (14). As used herein, the term “seal” and its variants shall be read to generally imply the prevention of at least a substantial portion material (e.g., solids, gases, and/or liquids) from escaping or entering the container. However, such a “seal” need not per se be perfectly “air tight” or “water tight” as those phrases are commonly used and understood.
As shown in
Engagement or disengagement of interlocking sections (12, 14) at teeth (22) may be effected or otherwise facilitated by a slider (16), which is shown in
As is also shown in
Those of ordinary skill in the art will appreciate that it may be desirable to provide some kind of assurance or indication as to whether a zipper (10) has been previously opened. In other words, it may be desirable to provide a device that is configured to show whether a zipper (10) and/or bag (30) has been tampered with. As used herein, the term “tamper evidence device,” including its variants, shall be read to include any feature, technique, and/or structure that is configured to provide evidence or indication that a bag (30) has been opened or otherwise tampered with. As used herein, the term “tamper” and its variants shall be read to include, but need not be limited to, an act of opening a bag (30) substantially or completely and/or gaining substantial or full access to its contents. Various exemplary devices for providing tamper evidence are shown in
In
Membrane (26) of the present example is configured such that, when bag (30) is first opened, membrane (26) must be broken, torn, or otherwise breached in order to reach the contents of bag (30). Initial breach of membrane (26) may be facilitated by providing perforation (28) or other weakened feature in membrane (26). In one embodiment, membrane (26) includes a central, longitudinal perforation (28) along its length. In another embodiment, membrane (26) includes a longitudinal perforation along its junction each interlocking section (12, 14). In still another embodiment, membrane (26) includes a longitudinal perforation along its junction with side (32 and/or 34) of bag (30). In yet another embodiment, a string, tab, or the like may be pulled to rip membrane (26). Still other ways of facilitating breach of membrane (26) will be apparent to those of ordinary skill in the art.
In the embodiment depicted in
In addition to or as an alternative to having interlocking sections (12, 14) comprising one or more tamper evidence devices, bag (30) may comprise a tamper evidence device. One such device is shown in
Seal (50) may be provided along at least a substantial portion of the length of bag (30), as a continuous line, as a pattern, as a broken line, or in any other suitable configuration. It will also be appreciated that, where sides (32, 34) of bag comprise a plurality of layers, seal (50) may join the innermost layers only, or the innermost layers in addition to other layers of the plurality. As with membrane (26) and spot seals (40) in interlocking sections (12, 14), seal (50) may be breached the first time full access to contents of bag (30) is gained by pulling interlocking sections (12, 14) and/or sides (32, 34) of bag (30) apart with sufficient force. One advantage of seal (50) may arise during the filling process. Bags (30) are often filled from the bottom after interlocking sections (12, 14) are affixed to the bag (30). The process of filling can introduce significant loads and could compromise a zipper (10) seal if the load is introduced directly. Intermediary seals (50) may absorb the filling load instead of zipper (10). While a few seals (50) may break, the rest of the seals (50) may remain intact. Of course, seals (50) may be formed after a bag (30) is filled.
Yet another embodiment of a tamper evidence device is shown in
Alternatively, interlocking sections (12, 14) may be extruded as a single piece, either in the “V”-like configuration shown in
In the embodiment depicted in
In addition to or as an alternative to having interlocking sections (12, 14) and/or bag (30) comprise one or more tamper evidence devices, slider (16) may comprise a tamper evidence device. Such slider (16) devices may provide an initial resistance to movement of slider (16). As used herein, particularly when referring to slider (16), the phrase “initial resistance” shall be understood to include a resistance encountered when slider (16) is slid for the first time. Such initial resistance will be greater than the resistance encountered during subsequent movement of slider (16). In other words, an initial resistance may provide an individual with tactile feedback indicating whether the slider (16) has been initially moved. The amount of initial resistance may be great enough to prevent movement of slider (16) during general handling of the container, but small enough to be overcome without causing substantial damage to slider (16), interlocking sections (12, 14), and/or the container. In certain embodiments, a tamper evidence device may provide a relatively high resistance to initial movement of slider (16) (e.g., relative to resistance encountered during subsequent movement of slider (16)), while not substantially affecting subsequent movement of slider (16).
In another embodiment, similar melting/deformation is obtained by a the use of a laser to form opening (80). Alternatively, any other source of focusable heat energy may be used to form opening (80) with melting-type deformation.
In another embodiment, opening (80) is formed by a member having a hook-like structure at its end being inserted through slider (16) and pulled back through opening (80). Accordingly, the hook-like structure will pass through adjacent portions of interlocking sections (12, 14) as well. It will be appreciated that, during withdrawal of the hook-like structure, the hook-like structure will pull material back through opening (80), which will result in deformation of the material. The presence of this deformed material within opening (80) will provide a seal within opening (80) similar to the seal provided by insertion of a hot needle-like structure through slider (16). Accordingly, the breaking of the seal will provide the above-described initial resistance, thereby indicating that slider (16) is being moved for the first time. Subsequent movement of slider (16) will not be substantially affected by opening (80) or the pull-through deformation resulting from the formation of opening (80). While a hook-like structure has been described for obtaining the pull-trough deformation, it will be appreciated that any other structure or technique may be used to effect pull-through and/or push-through deformation.
In yet another embodiment of the slider depicted in
In still another embodiment, an adhesive is placed on slider (16) and/or on interlocking sections (12, 14) near slider (16). In this embodiment, the adhesive provides the initial resistance to movement of slider (16). The properties of the adhesive are such that, when slider (16) is moved with sufficient force to break the seal or bond provided by the adhesive, damage to slider (16) and/or interlocking sections (12, 14) will not result. For instance, the adhesive may comprise a rubbery glue-like material. Other suitable adhesives for this embodiment and variations thereof will be apparent to those of ordinary skill in the art.
In another embodiment, initial resistance to movement of slider (16) is provided by sealing at least a portion of teeth (22) together. For instance, a longitudinal membrane may be used to join the tops of interlocking sections (12, 14) in the vertical region between teeth (22) and slider (16). This membrane and slider (16) may be configured such that movement of slider (16) is required to break the membrane. Before and during this breaking movement of slider (16), however, the membrane provides resistance to movement of slider. In the present example, the membrane may be longitudinally perforated or otherwise weakened to facilitate breaking of the membrane by slider (16). Alternatively, an adhesive may be used to join interlocking sections (12, 14) together in the region between the teeth (22) slider (16). Such an adhesive may provide initial resistance, yet have no significant effect on performance of slider (16) and/or zipper (10) during subsequent use. Still other membrane-slider or adhesive features, variations, and combinations will be apparent to those of ordinary skill in the art.
In still another embodiment, opening (80) is formed through interlocking sections (12, 14) proximate to slider (16), but not through slider (16). Such an opening (80) may be formed by any suitable technique, including but not limited to insertion of a hot needle-like structure, insertion of a hook-like structure, or any other technique. It will be appreciated that such an opening (80) formed through interlocking sections (12, 14) may provide features and advantages similar to those provided by having a similar opening (80) formed through slider (16). Of course, there may be additional advantages, which will be apparent to those of ordinary skill in the art.
While the foregoing tamper evidence devices have been described as providing a way in which tampering may be detected, it will be appreciated that such devices may provide other uses as well. By way of example only, it will be appreciated that during the normal course of handling of a given container, for instance from the time it is filled to the time it reaches a shelf in a retail setting, the handling may urge slider (16) to move, interlocking sections (12, 14) to separate, or lead to other potentially undesirable results. The foregoing tamper evidence devices may provide resistance to those and other results. For instance, and without limitation, an opening (80) formed through slider (16) and/or interlocking sections (12, 14) may prevent inadvertent movement of slider (16) during handling.
Of course, the foregoing examples are merely illustrative, and are not intended to be limiting in any way.
Having shown and described various embodiments and concepts of the invention, further adaptations of the methods and systems described herein can be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the invention. Several of such potential alternatives, modifications, and variations have been mentioned, and others will be apparent to those skilled in the art in light of the foregoing teachings. Accordingly, the invention is intended to embrace all such alternatives, modifications and variations as may fall within the spirit and scope of the appended claims and is understood not to be limited to the details of structure and operation shown and described in the specification and drawings.
Claims
1. A container system, comprising:
- (a) a container, comprising an opening defined by a first side wall and a second side wall, wherein the first side wall and the second side wall each have an inner surface and an outer surface, wherein the container comprises a paper material;
- (b) a zipper positioned at the container opening, the zipper comprising: (i) a first interlocking section having an inner surface, an outer surface, and one or more teeth adjacent the inner surface, and (ii) a second interlocking section having an inner surface, an outer surface, and one or more teeth adjacent the inner surface,
- wherein the zipper is operable to selectively open and close a seal of the container opening upon engagement between the one or more teeth of the first interlocking section and the one or more teeth of the second interlocking section, wherein the first interlocking section is secured to the first side wall with an adhesive, wherein the second interlocking section is secured to the second side wall with an adhesive.
2. The container system of claim 1, wherein the outer surface of the first side wall of the container is secured to the inner surface of the first interlocking section, wherein the outer surface of the second side wall of the container is secured to the inner surface of the second interlocking section.
3. The container system of claim 1, wherein the first interlocking section is not secured to the first side wall with sewing, wherein the second interlocking section is not secured to the second side wall with sewing.
4. The container system of claim 1, further comprising a slider configured to engage and disengage the teeth of the first interlocking section and the teeth of the second interlocking section.
5. The container system of claim 1, wherein the first and second interlocking sections each comprise a plastic material.
6. The container system of claim 1, wherein the container comprises a bag.
7. The container system of claim 1, wherein the container comprises multiple layers of material, wherein at least one of the layers comprises a heat-sealable material.
8. The container system of claim 7, wherein the first and second interlocking sections are each secured to a paper layer of the container.
9. The container system of claim 7, wherein the outermost layer of the container comprises a paper material.
10. The container system of claim 1, wherein the adhesive is heat activated.
11. A container system, comprising:
- (a) a container, comprising an opening defined by a first side wall and a second side wall, wherein the first side wall and the second side wall each have an inner surface and an outer surface, wherein the container comprises a paper material;
- (b) a zipper secured to the container, the zipper comprising: (i) a first interlocking section having an inner surface, an outer surface, one or more teeth adjacent the inner surface, and a flange region, and (ii) a second interlocking section having an inner surface, an outer surface, one or more teeth adjacent the inner surface, and a flange region, wherein the one or more teeth of the first interlocking section are configured to engage with the one or more teeth of the second interlocking section; and
- (c) a securing means for securing the first interlocking section to the first side wall and the second interlocking section to the second side wall, wherein the securing means is configured to prevent exogenous infestation of the container between the interlocking sections and the respective side walls.
12. The container system of claim 11, wherein the outer surface of the first side wall of the container is secured to the inner surface of the first interlocking section, wherein the outer surface of the second side wall of the container is secured to the inner surface of the second interlocking section.
13. The container system of claim 11, wherein the container comprises a bag.
14. A method of making a container system, comprising:
- (a) providing a bag, wherein the bag comprises an opening defined by a first side wall and a second side wall, wherein the bag further comprises a paper material;
- (b) providing a first interlocking section and a second interlocking section, wherein the first interlocking section has an inner surface, an outer surface, and one or more teeth adjacent the inner surface, wherein the second interlocking section has an inner surface, an outer surface, and one or more teeth adjacent the inner surface;
- (c) securing the first interlocking section to the first side wall;
- (d) securing the second interlocking section to the second side wall; and
- (e) prohibiting exogenous infestation of the bag through permeation between the interlocking sections and the respective side walls.
15. The method of claim 14, wherein the result of prohibiting exogenous infestation of the bag is obtained by performing a step of applying an adhesive between the interlocking sections and respective side walls.
16. The method of claim 15, wherein the adhesive is used to secure the interlocking sections to the respective side walls.
17. A container system, comprising:
- (a) a container, comprising an opening defined by a first side wall and a second side wall, wherein the first side wall and the second side wall each have an inner surface and an outer surface;
- (b) a zipper positioned at the container opening, the zipper comprising: (i) a first interlocking section having an inner surface, an outer surface, and one or more teeth adjacent the inner surface, and (ii) a second interlocking section having an inner surface, an outer surface, and one or more teeth adjacent the inner surface,
- wherein the zipper is operable to selectively open and close a seal of the container opening upon engagement between the one or more teeth of the first interlocking section and the one or more teeth of the second interlocking section, wherein the first interlocking section is secured to the first side wall with sewing, wherein the second interlocking section is secured to the second side wall with sewing, wherein the zipper comprises a plastic material.
18. The container system of claim 17, wherein the container has a heat-sealable ply, wherein heat is applied to at least a portion of the heat-sealable ply of the container.
19. The container system of claim 17, further comprising:
- (a) adding an adhesive between the first interlocking section and the first side wall; and
- (b) adding an adhesive between the second interlocking section and the second side wall.
20. The container system of claim 17, wherein the container comprises a gusseted bag, the method further comprising sealing portions of the gussets of the bag.
Type: Application
Filed: Sep 21, 2005
Publication Date: Mar 22, 2007
Inventors: Claude Eads (Maineville, OH), Rainer Garger (Weln), Thomas O'Connor (Shelbyville, IN)
Application Number: 11/231,502
International Classification: B65D 33/16 (20060101); B65D 30/08 (20060101);