WO2004024588A1

WO2004024588A1 - Flat-bottomed reclosable package with gussets

Info

Publication number: WO2004024588A1
Application number: PCT/US2002/034901
Authority: WO
Inventors: Terrance C. Anderson; Eric J. Aasen
Original assignee: Sig Pack Doboy Inc.
Priority date: 2002-09-12
Filing date: 2002-10-31
Publication date: 2004-03-25
Also published as: PL375253A1; EP1549559A1; JP2006511400A; CA2498279A1; US20040058103A1; AU2002336699A1

Abstract

A stand-up reclosable package is formed with a top and bottom seal, and a length-wise seal. The end of the bag is gusseted to form a flat, square shaped surface for the package to stand up. Another seal is formed length-wise along one side of the package to form the sides of the pack, defining the interior volume of the package. The top of the bag may be sealed in a manner consistent with existing vertical form fill and seal technology. The top of the package may have a reclosable feature. Additionally, the present invention provides a method of forming said reclosable stand-up package, including filling the package with desired contents as the package is formed and sealed.

Description

FLAT-BOTTOMED RECLOSABLE PACKAGE WITH GUSSETS

Field of the Invention The present invention relates to manufacturing plastic containers. More particularly, the present invention relates to a reclosable bag or pouch capable of standing up by itself when filled, and to a method of making the bag. Background of the Invention

Consumers greatly desire stand-up, reclosable plastic bags/containers because of the convenience of filling and storing dried foods, as well as liquid foods. There currently exist many so-called stand-up, freestanding or self-standing plastic bags. Known in the art are plastic bags incoφorating a zipper-type closure device along the top opening or mouth of the bags. Further, there are self-standing plastic bags that also incoφorate a zipper-type closure device along its mouth.

Some existing stand-up bags attempt to provide the stand-up capability merely by use of a simple bottom gusset alone or supplemented with seals added in the gusset structure. A simple bottom gusset sealed at its sides does not provide a normal consumer plastic bag with a stand-up feature with an adequate reclose feature. Such plastic bags are typically made from polyethylene film, which often is too limp to stand up from the gusseted bottom to permit easy reclosing of the bag. Consequently, it is difficult for the customer to have the bag rest on a surface without toppling over or easily open and reclose, in both cases typically spilling the contents of the bag. Other plastic bags have films of greater thickness, thus allowing them to stand up from a simple bottom gusset. Still other stand-up bags seal the bottom gusset into a base that is much more stable than the simple bottom gusset. Typically, these flat-bottom bags require gussets to be located on the top and bottom seals of the bag. Having a gusset on the top seal adds a great deal of complexity to the bag, especially when a reclosable feature is also incoφorated into the bag. Specifically, multiple layers of film are folded within the seal, not permitting normal reclosable features to be used (e.g., zipper-type). Thus, the bag assembly and manufacturing process is more complex. Consequently, more time is needed to assemble the bags, leading to higher manufacturing costs.

Furthermore, some difficulty has been experienced in filling and emptying all of the above-disclosed bags. The bags do not stand up easily when empty, and a zipper-type closure is difficult to maintain open when filling and emptying the bag. In order to provide a cost effective gusseted stand-up reclosable bag, it is contemplated that additional improvements are needed before consumers will be provided with a plastic bag that completely meets their needs. These improvements must relate to a more stable stand-up base, one that will faithfully support the bag when empty as well as during and after filling, and a bag that allows for only the bottom of the package to be gusseted. Also, there is a desire for a simpler and less costly method of assembling a gusseted stand-up reclosable bag. brief summary of the invention

The present invention provides a stand-up gusseted bag with a reclosable feature and method of making same designed to satisfy the aforementioned needs. The puφose of the present invention is to provide simple inexpensive bags or stand-up pouches that are able to contain products such as snacks, confections, pet foods, liquids and the like.

In one embodiment of the present invention, a package is formed with a top and bottom seal, and a length-wise seal. The bottom seal of the package is made by first folding the sides of the bag towards the center. While the sides are being held in place, the end of the bag is sealed (e.g., gusseted) to form a flat, square shaped surface for the package to stand up. Another seal is formed length-wise along one side of the package to form the sides of the pack, defining the interior volume of the package. The top of the bag is sealed in a manner consistent with existing vertical form fill and seal technology. Specifically, a flat, full-length seal across the width of the bag is made. Since there are no gussets in the top seal, the addition of a reclosable feature is possible.

The reclosable feature of the present invention may be any conventional re-closing mechanism, such as a zipper, zipper-slider seal, snap-lock technology, or the like. Additionally, the present invention provides the method of forming said reclosable stand-up package, including filling the package with desired contents as the package is formed and sealed.

Alternatively, a gusset may be formed on the top of the package. The package may be created in many styles. For example, one style involves placing an opening at the top of the package and then covering it with an additional piece of packaging film attached to the inside of the bag to maintain the package's integrity prior to initial opening. This opening may be a slit, a perforation, a punched opening, or the like. This opening may also be reinforced to eliminate the tendency of some packaging films to tear down the length of the bag. It is an object of the present invention to provide an efficient and cost effective apparatus and method for reclosing gusseted stand-up packages and retaining the contents therein.

It is another object of the present invention to provide the package with the ability to maintain a stand-up capability as the contents of the package are consumed/removed.

These and further aspects, objects and advantages of the present invention will become clearer in light of the following detailed description of the illustrative embodiments of this invention described in connection with the drawings.

Brief Description of the Drawings Further objects and advantages of the present invention can be seen by reading the following detailed description in conjunction with the drawings in which: igure 1 is a perspective view of an embodiment of the present invention; Figure 2 is a side view of the embodiment of Figure 1; Figure 3 is a rear view of the embodiment of Figure 1. Figure 4A is a perspective view of the embodiment of Figure 1 with the package in the process of being opened.

Figure 4B is a perspective view of an alternative embodiment of the present invention with the package in the process of being opened.

Figure 5 is a perspective view of the present invention with the package in an opened orientation.

Figure 6 is a perspective view of the present invention with the package in a closed position.

Figure 7 is cross-sectional view of the reclosable mechanism of Figure 6 in the closed position. Figure 8 is a perspective view of the present invention with the package full of goods in a closed position.

Figure 9 is a perspective view of the present invention with the package full of goods in an opened position.

Figure 10 is a diagram of an embodiment of the formation of the present invention via vertical form fill and seal machinery.

Figure 11 is a diagram of an alternative embodiment of vertical form fill and seal machinery to form the present invention. Figure 12 is a diagram of a further alternative embodiment of vertical form fill and seal machinery to fonn the present invention, detailed description of the invention

As mentioned above, the present invention relates to stand-up gusseted reclosable packages and the method of making the same. This invention may be applied to many different types of packaging machinery, and to other processing equipment and operations. For example, the present invention may be used to produce products or other containers for holding and containing materials. Additionally, the present invention may be used in self- standing items to display advertising, or formed using vertical form fill and seal (VFFS) machines and horizontal form fill and seal (HFFS) machines.

Shown in Figures 1-9, is a stand-up gusseted reclosable bag that may be formed using machinery. The present invention may be formed using VFFS machinery, as shown in Figures 10-12. The stand-up plastic bag has a front wall, a rear wall, a pair of gusseted sides and a flat bottom wall or portion, defining an interior volume. An open bag mouth is defined at the upper edges of the walls.

The front and rear walls may have opposite longitudinal edges joined together by a heat seal at contiguous portions of material on the exterior surface thereof which complete formation of a seal as a continuous self-standing structure that defines, with the bottom wall, a stand-up base of the bag. The gusseted sides have portions interconnected together to form a substantially flat bottom wall extending between the front and rear walls, and sides. The sides may also have lower portions joined by seals to lower portions of the front and rear sides at contiguous portions of material to form a support band that connects to and extends below the bottom wall. For example, the bag may have a base seal that utilizes gussets on the sides of the bag in forming the flat bottom portion or base.

The walls are composed of a multi-layered film. The film is preferably a plastic, for example, polyethylene, and may be heat-sealable and/or coextruded. However, it is contemplated that any paper, thermoplastic, or like material may be utilized. For example, materials may be used to permit use of the package in a microwave, a freezer and refrigerator. In its most common environment, the method of assembly of the present invention will be a component of a larger manufacturing operation and results in the gusseted reclosable stand- up bag. For example, the self-standing flat-bottomed bag with a reclosable feature may be automatically formed on a VFFS machine, as shown in Figures 10-12. In Figure 10, one embodiment of formation of the present invention via a vertical form fill and seal machine is shown. In this embodiment, a longitudinal seal is first formed through normal VFFS machine operation creating a tube of film that travels down a round forming collar. The VFFS machine advances bag film exactly one bag length and stops. A sealing bar and feature press close simultaneously, and a top transverse seal of the bag is formed. The reclose feature (i.e., Easy Snap, Zipper, Slider) is may be applied at this time. While the top seal and reclose feature are being formed, a serrated cut-off knife is actuated through the film separating the newly formed bag from the end of a tube of film. The cut-off knife is then retracted. Subsequently, the sealing bar and feature press open simultaneously. The feature press may continue to grasp film to increase dwell time for proper reclose feature formation. The end of the film tube relaxes to its natural round shape.

A secondary sealing bar and gusseting fingers close on the film simultaneously creating bottom a transverse seal and the flat stand-up geometry of bag. Two separate gusseting fingers are located on opposite sides of the bag. A specially designed rectangular forming tube attachment on the inside of the film tube aids in the formation of the flat bottom geometry. The width and depth of the gusseted portion of the bag are determined by the size of this attachment.

Product may begin to be dumped into the bag as soon as the secondary seal bar and gusseting fingers close. The forming tube attachment, gusseting finger, and secondary sealing bars are preferably mechanically aligned to the bottom edge of film to ensure that the bottom seal is formed exactly along the edge of film. This ensures that no excess film has to be trimmed from the bag to provide a neat seal appearance. Additionally, no extra film has to be discarded during the formation of the bottom seal.

In Figure 11, an alternative embodiment of VFFS machinery is shown. This embodiment is a variation of the embodiment of Figure 10 in which the film tube is advanced a second time during the formation of the bag. This allows the bottom edge of film to be realigned to the sealing bar prior to the formation of the bottom transverse seal and stand-up geometry. The advantage of this action is that there is no need for a secondary seal bar and mechanism to actuate it. In Figure 12, an further alternative embodiment of VFFS machinery is shown. This embodiment is another alternative to the embodiment of Figure 10 in which the film is reversed during the formation of the bag. This allows the bottom edge of film to be aligned to the secondary seal bar prior to the formation of the bottom transverse seal and stand-up geometry. The advantage of this action is that the bottom film edge may be aligned electronically through a VFFS machine computer controller. This eliminates the mechanical alignment of the secondary sealing bars, gusseting fingers, and forming tube attachment.

It should be noted that other variations of the sequence of operation of the embodiments of Figures 10-12 is contemplated, based on the many different designs and functions of VFFS machines in the market today. For example, some VFFS machinery operates with continuous motion versus intermittent motion. It is contemplated that this technology could be adapted to work with the present invention as well.

Additionally, the present invention may be adapted to be applied to horizontal form fill and seal flow wrapping technology. This should be differentiated from the horizontal form, vertical fill and seal market in which "stand-up pouch" style bags are formed.

The seals of the present invention may be accomplished via a seal bar or similar device or procedure. As stated above, the seals are preferably located longitudinally along a portion of the bag, for example, the rear wall of the bag as shown in Figures 2 and 3. A seal extends below the flat bottom portion of the bag. See Figures 1-3.

As shown in Figures 4A and B, 5 and 9, the mouth opening at the top of the bag may be of numerous styles such as a slit, a perforation or a punched opening. The reclosable feature of the present invention applied to close the mouth opening may be any conventional re-closing mechanism. For example, a zipper, slider, seal, Zip-Loc™, or the like, or snap- lock technology (Easy Snap), as shown in Figures 1-9, may be utilized. The snap-lock technology is disclosed in U.S. Patent Nos. 6,350,057, 5,983,594, 5,944,425, 5,937,615, 5,928,749 and 4,679,693, all to Forman, and is incoφorated herein by reference.

The mouth opening may also be reinforced to eliminate the tendency of some packaging films to tear down the length of the bag. It may also be covered on the exterior of the package to protect or close off the opening with various removable materials such as a strip of tape, a label or the like. See Figures 1, 2 and 4. Alternatively, a seal may be used at the top of the bag to completely cover the bag opening.

The present invention has several advantages over existing packages in use today. Typical flat-bottom bags are required to be gusseted on the top and bottom seals. Having a gusset on the top seal adds a great deal of complexity to the addition of a reclosable feature. Multiple layers of film are folded within the seal not allowing normal reclosable features to be used, such as a zipper or slider mechanism. The present invention provides a reclosable feature on a gusseted stand-up bag. Moreover, the present invention requires the utilization of the special sealing jaws and gusseting manufacturing equipment for only the bottom of the package. Consequently, manufacturing time, assembly complexity and costs are greatly reduced.

Those skilled in the art will further appreciate that the present invention may be embodied in other specific forms without departing from the spirit or central attributes thereof. In that the foregoing description of the present invention discloses only exemplary embodiments thereof, it is to be understood that other variations are contemplated as being within the scope of the present invention. Accordingly, the present invention is not limited in the particular embodiments that have been described in detail therein. Rather, reference should be made to the appended claims as indicative of the scope and content of the present invention.

Claims

What is claimed is:

1. A stand-up plastic bag, comprising:

(a) an opposed front wall and rear wall, each wall having an upper and lower edge and longitudinal edges, such that the walls define a bag opening at upper edges thereof; (b) a pair of gusseted sides disposed between the opposed front and rear walls and running along the longitudinal edges, wherein the gussets are located on a lower portion of the sides;

(c) a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion, front and rear walls, and the sides configured such that the bag conforms to a stand-up bag orientation;

(d) the front and rear walls, the sides, and the bottom portion define an interior volume of the bag; and

(e) a reclosable device located proximate the bag opening, such that no gussets are required on the upper portion of the bag, wherein the bag opening may be selectively opened and closed.

2. The stand-up bag of claim 1, wherein said front, rear and sides and said bottom portion are composed of a multi-layered film of thermoplastic material.

3. The stand-up bag of claim 1, wherein said bottom portion having portions of the front and rear walls interconnected together at contiguous portions to form a seal extending below the periphery of said bottom portion.

4. The stand-up bag of claim 1, wherein said front and rear walls have opposite longitudinal edges joined together by an elongate seal made at a contiguous portion thereof.

5. The stand-up bag of claim 1 , wherein the reclosable device is a zipper lock.

6. The stand-up bag of claim 1, wherein the reclosable device is a slider.

7. The stand-up bag of claim 1, wherein the reclosable device is a snap-lock mechanism.

8. A reclosable bag comprising: a pair of gusseted sides disposed between a front wall and a rear wall, wherein the gussets are located on a lower portion of the sides; a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion defining a base for the stand-up orientation of the bag; a reclosable device located proximate a bag opening, such that no gussets are required on an upper portion of the bag; and wherein the bag is formed on a vertical form filling system.

9. The reclosable bag of claim 8, further comprising front and rear walls have opposite longitudinal edges joined together by an elongate seal made at a contiguous portion thereof.

10. The method of forming a self-standing reclosable package comprising: providing a supply web; forming an opposed front wall and rear wall, wherein each wall has an upper and lower edge and longitudinal edges, such that the walls define a package opening at upper edges thereof; forming a pair of gusseted sides between the front and rear walls, wherein the gussets are located on a lower portion of the sides; forming a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion, front and rear walls, wherein the sides are configured such that the package conforms to a stand-up orientation, and wherein the front and rear walls, the side walls, and the bottom portion define an interior volume of the package; attaching a reclosable device proximate the package opening, such that no gussets are required on the upper portion of the package; and wherein a flexible package comprising a package body for enclosing a product is formed.

11. The method of claim 10, further comprising forming a base seal where the front and rear walls are interconnected together at contiguous portions, such that the gussets are formed on the sides when forming the base seal.

12. The method of claim 10, further comprising forming the bag using a vertical form filling system.

13. A manufactured self-standing package containing goods having a reclosable opening, the web manufactured package fonned by: providing a supply web; providing a packaging mechanism for placing goods within the package formed from the supply web; forming an opposed front wall and rear wall, wherein each wall has an upper and lower edge and longitudinal edges, such that the walls define a package opening at upper edges thereof; forming a pair of gusseted sides between the front and rear walls, wherein the gussets are located on a lower portion of the sides; forming a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion, front and rear walls, wherein the sides configured such that the package conforms to a stand-up orientation, and wherein the front and rear walls, the sides, and the bottom portion define an interior volume of the package; attaching a reclosable device proximate the package opening, such that no gussets are required on the upper portion of the package; filling the interior volume of the package with goods; and wherein a flexible package comprising a package body enclosing goods is formed.

14. The manufactured self-standing package of claim 13, wherein the packaging mechanism is a vertical form filling system.

15. The manufactured self-standing package of claim 13, further comprising: forming a seal along the bottom portion of the package, wherein portions of the front and rear walls are interconnected at contiguous portions to form the seal extending below the periphery of said bottom portion; and forming a seal along the opposite longitudinal edges of the front and rear walls, wherein the elongate seal is made at a contiguous portion thereof and runs longitudinally along the rear wall.

16. The manufactured self-standing package of claim 15, further comprising covering the opening of the package to enclose the goods.

17. A stand-up plastic bag, comprising: (a) an opposed front wall and rear wall, each wall having an upper and lower edge and longitudinal edges, such that the walls define a bag opening at upper edges thereof;

(b) a pair of gusseted sides disposed between the opposed front and rear walls and running along the longitudinal edges, wherein the gussets are located on a lower portion of the sides; (c) a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion, front and rear walls, and the sides configured such that the bag conforms to a stand-up bag orientation; and

18. The stand-up bag of claim 17, wherein said bottom portion having portions of the front and rear walls interconnected together at contiguous portions to form a seal extending below the periphery of said bottom portion.

19. The method of forming a self-standing reclosable package comprising: providing a supply web; forming an opposed front wall and rear wall, wherein each wall has an upper and lower edge and longitudinal edges, such that the walls define a package opening at upper edges thereof; forming a pair of gusseted sides between the front and rear walls, wherein the gussets are located on a lower portion of the sides; forming a flat bottom portion adjacent a lower portion the front and rear walls and the sides, the bottom portion, front and rear walls, wherein the sides are configured such that the package conforms to a stand-up orientation, and wherein the front and rear walls, the side walls, and the bottom portion define an interior volume of the package; forming a base seal where the front and rear walls are interconnected together at contiguous portions, such that the gussets are formed on the sides when forming the base seal; and wherein a flexible package comprising a package body for enclosing a product is formed.

20. The method of claim 19, further comprising fonning the bag using a vertical form filling system.