Pouches having reclosable pour spout in side gusset
A package comprising: a gusseted tube of film sealed at a top and a bottom thereof by top and bottom cross seals respectively, the bottom seal extending the full width of the package and the top seal extending along a major portion of the package width. The gusseted tube comprises a side gusset extending from the top to the bottom of the tube, wherein the side gusset and the top seal do not overlap. The package further comprises a flexible zipper comprising a first zipper strip joined to a portion of and extending across the width of the side gusset, and a second zipper strip joined to portions of the tube. After the zipper is opened, an upper portion of the side gusset to which the zipper is attached can be inverted to form a pour spout.
This invention generally relates to packaging for containing pourable contents such as breakfast cereal, snack food product and the like. More particularly, the invention relates to flexible pouches provided with a reclosable pour spout.
It is known to package breakfast cereal by sealing the dry cereal product inside a plastic pouch and then placing the filled pouch within a paperboard box or carton. A disadvantage with this type of packaging is that once the sealed pouch is opened, it is difficult to reseal the pouch in a moisture-tight manner necessary to maintain freshness of the cereal product.
In order to close a conventional cereal pouch after the sealed top end has been opened, the user will typically fold the opened end of the pouch over onto itself one or more times. Closing the pouch in this way is awkward. Oftentimes the user will simply stuff the opened end of the pouch down into the box without regard to properly sealing of the opening. As additional serving portions of the cereal product are emptied from the pouch, it becomes more difficult to roll up or fold the empty portion of the pouch within the depth of the box or carton. However, even when the opened end of the plastic pouch is folded or rolled up, an effective seal cannot be assured since the plastic material has a degree of stiffness and does not adhere to itself.
It is also difficult to open the sealed top end of conventional cereal pouches without also ripping or tearing the walls of the pouch. An unevenly opened pouch may have an overhanging portion that blocks or traps cereal during pouring. In the case where the pouch is used as a liner within a box, an overhanging portion of the ripped open pouch may also cause spillage of the cereal contents into the crevice space between the pouch and the box as the box is returned to the upright position.
There is a need for improvements in flexible pouches of the type having a reclosable pour spout.
BRIEF DESCRIPTION OF THE INVENTIONThe present invention is directed to flexible pouches having a plastic zipper installed in a side gusset. The zipper comprises one zipper strip attached to an upper portion of the side gusset and another zipper strip attached to confronting portions of the pouch walls. After the zipper is opened, an upper portion of the side gusset to which the zipper is attached can be inverted to form a pour spout.
One aspect of the invention is a package comprising a receptacle having an interior volume and a spout that, when in an opened state, allows the package exterior to communicate with the interior volume, the receptacle comprising first and second walls and a side gusset connected to the first and second walls, the spout being formed by an upper portion of the side gusset and adjoining first upper portions of the first and second walls respectively, wherein confronting second upper portions of the first and second walls contiguous with the first upper portions of the first and second walls respectively are sealed together at or near a top of the receptacle; and further comprising a flexible zipper attached to the spout in a manner such that the spout is closed when the zipper is closed and the spout is open to the extent that the zipper is opened, the zipper comprising a first zipper strip joined to the side gusset and a second zipper strip joined to the first and second walls.
Another aspect of the invention is a package comprising: a gusseted tube of film sealed at a top and a bottom thereof by top and bottom cross seals respectively, the bottom seal extending the full width of the package, the top seal extending along a major portion of the package width, and the gusseted tube comprising a side gusset extending from the top to the bottom of the tube, wherein the side gusset and the top seal do not overlap; and further comprising a flexible zipper comprising a first zipper strip joined to a portion of the side gusset, and a second zipper strip joined to portions of the tube.
A further aspect of the invention is a package comprising a receptacle having a reclosable spout in one corner, the receptacle having an interior volume that communicates with the exterior of the package via the spout when the zipper is in the opened state, the receptacle comprising first and second walls and a side gusset connected to the first and second walls, the side gusset comprising first and second gusset panels that are connected to each other at a first fold line, the first gusset panel being connected to the first wall at a second fold line, and the second gusset panel being connected to the second wall at a third fold line, the spout comprising respective portions of the first and second gusset panels and respective portions of the first and second walls, wherein the first zipper strip is joined to the portions of the first and second gusset panels, and the second zipper strip is joined to the portions of the first and second walls.
Yet another aspect of the invention is a method of manufacturing a package having a reclosable spout, comprising the following steps: interlocking respective segments of first and second zipper strips together; joining the first zipper strip segment to a web of packaging material; forming the web into a tube; forming a gusset in the tube, the gusset being situated such that the first zipper strip segment extends across the width of the gusset and no further; forming a bottom seal across the gusseted tube; filling the tube above the bottom seal with product; joining the second zipper strip segment to respective portions of the tube; and forming a top seal across a portion of the tube adjacent the zipper.
Other aspects of the invention are disclosed and claimed below.
Reference will now be made to the drawings in which similar elements in different drawings bear the same reference numerals.
DETAILED DESCRIPTION OF THE INVENTIONVarious embodiments of the invention will now be described. Each of the packages described below may be manufactured on a VFFS machine. Each disclosed embodiment comprises a tube of flexible packaging material, such as thermoplastic pouch making film, formed by wrapping the packaging material around a fill tube and then sealing confronting longitudinal edges together, e.g., by conventional conductive heat sealing. Either a lap seal or a fin seal can be formed. Then opposing side gussets are formed in the tube. The gusseted tube is cross sealed to form a bottom seal. The pocket above the bottom seal is then filled with product. Then the tube is again cross sealed at an elevation above the product fill line to form a top seal that extends across a major portion of the package width. The top and bottom cross seals are typically formed by conductive heat sealing using reciprocating heated sealing bars.
The embodiments disclosed hereinafter also incorporate structure that can be configured to form a pour spout, that pour spout being reclosable by means of a zipper-type fastener comprising a pair of flexible zipper strips that are mutually interlockable. The zipper may be transversely applied to the film before the latter enters the VFFS machine, one zipper strip being attached to the film and the other zipper strip being interlocked with and carried by the attached zipper strip. The length of the zipper is slightly less than the width of the side gusset with attached zipper that will be formed in the VFFS machine. The unattached zipper strip may be attached to respective portions of film at the same time when the top cross seal is made.
The technology for transverse application of flexible zippers at spaced intervals on an intermittently advancing web of pouch making film (during dwell times) at a station upstream of a VFFS machine is well known. A distal portion of a fastener tape is oriented transversely in overlying relationship with a tensioned section of a web of pouch making film situated upstream of the VFFS machine. A distal section of the fastener tape is then severed from the remainder of the fastener tape to form a zipper assembly that will be joined to the web. The equipment for manufacturing the fastener tape may be placed in line with the zipper application station. Alternatively, the fastener tape may be manufactured at a different site, wound onto a supply reel that is transported to the site of the VFFS machine, and then paid out from that supply reel during operation of the VFFS machine.
The fastener tape comprises a pair of zipper strips, each zipper strip being formed by extruding thermoplastic material to form a respective closure profile and one or two zipper flanges connected thereto. The closure profiles have complementary shapes that interlock, the shapes being constant in the lengthwise direction. The fastener tape may be manufactured using a process involving concurrent formation of slider end stop structures and sealing of zipper flanges at spaced intervals.
A package in accordance with one embodiment of the invention is shown in
As best seen in
The rear wall 24 also comprises a vertical fin seal 8 that extends the full height of the package, as best seen in
The top seal 10 is preferably formed by conductive heat sealing and comprises the following sections (described with reference to
The bottom seal 12 is also preferably formed by conductive heat sealing and comprises the following sections (described with reference to
The embodiment shown in
The structure and position of the zipper are shown in more detail in the sectional view of
While
A package in accordance with a second embodiment is shown in
As seen in
The slider 58 is preferably of the straddling type, i.e., the slider has no separating finger and thus requires that slider end stops be provided at the ends of the zipper. As seen in
Preferably, the slider/zipper assembly 58/52 is of the type disclosed in U.S. Pat. No. 6,047,450, in which the slider has no separating finger and the closure profiles provide a moisture-tight, if not airtight, seal when the zipper is fully closed. Alternatively, the zipper may comprise interlocking alternating hook-shaped or ball-shaped closure elements. The zipper strips are made of thermoplastic material. The preferred zipper material is polyethylene or polypropylene. To facilitate the joinder of the zipper flanges to the packaging material, the zipper flanges may have a surface layer of sealant material that melts at a temperature lower than the melting point of the material making up the remainder of the zipper.
A further embodiment of the invention is shown in
The embodiment shown in
The purpose of the extended length of upper flange 46′ is that it allows the upper flanges of both zipper strips to be joined to the side gusset at different elevations. As seen in
The portions of gusset panels 20 and 22 that are joined to the respective upper flanges 42 and 46′ are connected by a portion of the side gusset in which a line of weakened tear resistance 68 (hereinafter “tear line”) has been formed. The tear line 68 extends horizontally across the width of the side gusset, i.e., across gusset panels 20 and 22, as seen in
In accordance with yet another embodiment, the reclosable spout may comprise a zipper of the type wherein the zipper strips have respective pull flanges for opening the zipper, while a clip of a type adapted for pressing the closure profiles of the zipper strips into interlocking relationship is mounted to the zipper strips. In other words, the clip is used to close the zipper, but serves no role in opening the zipper.
While the invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for members thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the invention without departing from the essential scope thereof. Therefore it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
As used in the claims, the verb “joined” means fused, bonded, sealed, or adhered, whether by application of heat and/or pressure, application of ultrasonic energy, application of a layer of adhesive material or bonding agent, interposition of an adhesive or bonding strip, etc. As used in the claims, the term “wall” is used in a broad sense to include both a discrete piece of packaging material and a portion of a folded piece of packaging material. Furthermore, in the absence of explicit language in any method claim setting forth the order in which certain steps should be performed, the method claims should not be construed to require that steps be performed in the order in which they are recited.
Claims
1. A package comprising:
- a receptacle having an interior volume and a spout that, when in an opened state, allows the package exterior to communicate with said interior volume, said receptacle comprising first and second walls and a first side gusset connected to said first and second walls, said spout being formed by an upper portion of said first side gusset and adjoining first upper portions of said first and second walls respectively, wherein confronting second upper portions of said first and second walls contiguous with said first upper portions of said first and second walls respectively are sealed together at or near a top of said receptacle; and
- a flexible zipper attached to said spout in a manner such that said spout is closed when said zipper is closed and said spout is open to the extent that said zipper is opened, said zipper comprising a first zipper strip joined to said first side gusset and a second zipper strip joined to said first and second walls.
2. The package as recited in claim 1, wherein said first zipper strip comprises a first closure profile and a first flange connected to said first closure profile, and said second zipper strip comprises a second closure profile that is engageable with said first closure profile and a second flange connected to said second closure profile, said first flange being joined to said first side gusset, and said second flange being joined to said first and second walls.
3. The package as recited in claim 2, further comprising a slider mounted to said zipper, said slider being movable in a closing direction to cause portions of said first and second closure profiles to engage and in an opening direction to cause portions of said first and second closure profiles to disengage.
4. The package as recited in claim 3, further comprising a first slider end stop positioned at one end of said zipper to stop said slider from moving further in said closing direction; and a second slider end stop positioned at the other end of said zipper to stop said slider from moving further in said opening direction.
5. The package as recited in claim 1, wherein said first zipper strip comprises a first closure profile and first and second flanges connected to said first closure profile, and said second zipper strip comprises a second closure profile and a third flange connected to said second closure profile, said first and second flanges being joined to said first side gusset, and said third flange being joined to said first and second walls.
6. The package as recited in claim 5, wherein said third flange is also joined to said first side gusset, the respective zones of joinder of said first and third flanges to said first side gusset being connected by a section of said first side gusset having a line of weakness.
7. The package as recited in claim 6, wherein said line of weakness comprises a line of spaced perforations.
8. The package as recited in claim 1, wherein said receptacle further comprises a second side gusset.
9. The package as recited in claim 1, wherein confronting lower portions of said first and second walls are sealed together at or near a bottom of said receptacle.
10. The package as recited in claim 1, wherein said first side gusset extends from said top to a bottom of said receptacle.
11. A package comprising:
- a gusseted tube of film sealed at a top and a bottom thereof by top and bottom cross seals respectively, said bottom seal extending the full width of the package, said top seal extending along a major portion of said package width, and said gusseted tube comprising a first side gusset extending from said top to said bottom of said tube, wherein said first side gusset and said top seal do not overlap; and
- a flexible zipper comprising a first zipper strip joined to a portion of said first side gusset, and a second zipper strip joined to portions of said tube.
12. The package as recited in claim 11, wherein said first zipper strip comprises a first closure profile and a first flange connected to said first closure profile, and said second zipper strip comprises a second closure profile that is engageable with said first closure profile and a second flange connected to said second closure profile, said first flange being joined to said first side gusset, and said second flange being joined to said portions of said tube.
13. The package as recited in claim 12, further comprising a slider mounted to said zipper, said slider being movable in a closing direction to cause portions of said first and second closure profiles to engage and in an opening direction to cause portions of said first and second closure profiles to disengage.
14. The package as recited in claim 11, wherein said first zipper strip comprises a first closure profile and first and second flanges connected to said first closure profile, and said second zipper strip comprises a second closure profile and a third flange connected to said second closure profile, said first and second flanges being joined to said first side gusset, and said third flange being joined to said first and second walls.
15. The package as recited in claim 14, wherein said third flange is also joined to said first side gusset, the respective zones of joinder of said first and third flanges to said first side gusset being connected by a section of said first side gusset having a line of weakness.
16. The package as recited in claim 11, wherein said receptacle further comprises a second side gusset.
17. A package comprising a receptacle having a reclosable spout in one corner, said reclosable spout comprising a zipper having closed and opened states, said receptacle having an interior volume that communicates with the exterior of said package via said spout when said zipper is in said opened state, said receptacle comprising first and second walls and a side gusset connected to said first and second walls, said side gusset comprising first and second gusset panels that are connected to each other at a first fold line, said first gusset panel being connected to said first wall at a second fold line, and said second gusset panel being connected to said second wall at a third fold line, said spout comprising respective portions of said first and second gusset panels and respective portions of said first and second walls, wherein said first zipper strip is joined to said portions of said first and second gusset panels, and said second zipper strip is joined to said portions of said first and second walls.
18. The package as recited in claim 17, further comprising a slider mounted to said zipper, said slider being movable in a closing direction to close said zipper and in an opening direction to open said zipper.
19. The package as recited in claim 17, wherein said first zipper strip comprises a first closure profile and first and second flanges connected to said first closure profile, and said second zipper strip comprises a second closure profile and a third flange connected to said second closure profile, said first and second flanges being joined to said side gusset, and said third flange being joined to said first and second walls.
20. The package as recited in claim 19, wherein said third flange is also joined to said side gusset, the respective zones of joinder of said first and third flanges to said side gusset being connected by a section of said side gusset having a line of weakness.
21. A method of manufacturing a package having a reclosable spout, comprising the following steps:
- interlocking respective segments of first and second zipper strips together;
- joining said first zipper strip segment to a web of packaging material;
- forming said web into a tube;
- forming a gusset in said tube, said gusset being situated such that said first zipper strip segment extends across the width of said gusset and no further;
- forming a bottom seal across said gusseted tube;
- filling said tube above said bottom seal with product;
- joining said second zipper strip segment to respective portions of said tube; and
- forming a top seal across a portion of said tube adjacent said zipper.
Type: Application
Filed: Jul 7, 2006
Publication Date: Jan 10, 2008
Inventors: Glyn Russell (New City, NY), Leslie A. Wilson (Schnecksville, PA)
Application Number: 11/482,620
International Classification: B65D 33/16 (20060101); B65D 30/20 (20060101); B65D 33/00 (20060101);