WO2003101848A1

WO2003101848A1 - Package with pocket and method for making the same

Info

Publication number: WO2003101848A1
Application number: PCT/US2003/014407
Authority: WO
Inventors: Anthony Robert Knoerzer; Garrett William Kohl; Steven Kenneth Tucker
Original assignee: Frito-Lay North America, Inc.
Priority date: 2002-05-28
Filing date: 2003-05-08
Publication date: 2003-12-11
Also published as: US20030223653A1; AU2003241392A1

Abstract

A flexible package (50) method for making the same provides for a package that has a pocket (60) formed adjacent to a portion of a package. The package can be filled with one product in the main compartment (58) of the package and can be filled with a separate product in the pocket (60). The package is formed with an extra length of film (61) extended adjacent to the main portion of the tube of the package. First and second longitudinal seals (62, 64) are provided to form a pocket (60) over a portion of the tube of the package. The package can then be filled with a first product in the main portion of the package and a second product in the separate and distinct pocket.

Description

APPLICATION FOR

UNITED STATES LETTERS PATENT

FOR PACKAGE WITH POCKET AND METHOD FOR MAKING THE SAME

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to a flexible package, and the method for making same. More particularly, the present invention relates to a flexible package, and the method for making the same that contains a pocket. The invention allows for the production of a flexible package with a pocket that can be filled with material such that the material in the pocket is integral to the package and easily accessible yet separated from a main portion of the package.

2. Description of Related Art

Vertical form, fill, and seal packaging machines are commonly used in the snack food industry for forming, filling, and sealing bags of chips and other like products. Such packaging machines take a packaging film from a sheet roll and forms the film into a vertical tube around a product delivery cylinder. The vertical tube is vertically sealed along its length to form a back seal. The machine applies a pair of heat-sealing jaws or facings against the tube to form a transverse seal. This transverse seal acts as the top seal on the bag below and the bottom seal on the package being filled and formed above. The product to be packaged, such as potato chips, is dropped through the product delivery cylinder and formed tube and is held within the tube above the bottom transverse seal. After the package has been filled, the film tube is pushed downward to draw out another package length. A transverse seal is formed above the product, thus sealing it within the film tube and forming a package of product. The package below said transverse seal is separated from the rest of the film tube by cutting across the sealed area.

The packaging film used in such process is typically a composite polymer material produced by a film converter. For example, one prior art composite film used for packaging potato chips and like products is illustrated in Figure la, which is a schematic of a cross- section of the film illustrating each individual substantive layer. Figure la shows an inside, or product side, layer 16 which typically comprises metalized oriented polypropylene ("OPP") or metalized polyethylene terephtalate ("PET"). This is followed by a laminate layer 14, typically a polyethylene extrusion, and an ink or graphics layer 12. The ink layer 12 is typically used for the presentation of graphics that can be viewed through a transparent outside layer 10, which layer 10 is typically OPP or PET.

The prior art film composition shown in Figure la is ideally suited for use on vertical form and fill machines for the packaging of food products. The metalized inside layer 16, which is usually metalized with a thin layer of aluminum, provides excellent barrier properties. The use of OPP or PET for the outside layer 10 and the inside layer 16 further makes it possible to heat seal any surface of the film to any other surface in forming either the transverse seals or back seal of a package.

Typical back seals formed using the film composition shown in Figure la are illustrated in Figures 2 and 3. Figure 2 is a schematic of a "lap seal" embodiment of a back seal being formed on a tube of film. Figure 3 illustrates a "fin seal" embodiment of a back seal being formed on a tube of film.

With reference to Figure 2, a portion of the inside metalized layer 26 is mated with a portion of the outside layer 20 in the area indicated by the arrows to form a lap seal. The seal in this area is accomplished by applying heat and pressure to the film in such area. The lap seal design shown in Figure 2 insures that the product to be placed inside the formed package will be protected from the ink layer by the metalized inside layer 26.

The fin seal variation shown in Figure 3 also provides that the product to be placed in the formed package will be protected from the ink layer by the metalized inside layer 36. Again, the outside layer 30 does not contact any product. In the embodiment shown in Figure 3, however, the inside layer 36 is folded over and then sealed on itself in the area indicated by the arrows. Again, this seal is accomplished by the application of heat and pressure to the film in the area illustrated.

As noted, a benefit of both the prior art fin seal and lap seal design is the containment of the product in the package by a barrier layer (the metalized inside layer) that keeps ink and solvent levels in the package to a minimum. Ink and solvent levels in fatty food packages are frequently regulated to insure product safety. It may be desirable, however, to provide a graphics capability inside a package. This would allow for promotional information or coupons to be maintained inside the package and only accessible after the consumer has opened the package. For example, a promotional prize campaign could be offered with the prize announcements being maintained inside the package. Likewise, coupons offering product rebate rewards, promotional prize points, or discounts on products could be maintained within the sealed package.

One prior art method used to provide a graphics capability inside the package involves the use of a paper insert dropped with the product into the package during filling. When the consumer opens the package, the paper insert can be removed for viewing and use. This method has several drawbacks, however. The reliability of placing a single paper insert in each bag (by dropping the paper with a weighed amount of product) is a major consideration, particularly in small packages. A capacity issue is raised by the need to rent inserters to be used during the filling process. Foreign matter detectors are also frequently set off by the detection of the paper insert within the bag. The insertion of a piece of paper can raise the solvent level in the package beyond acceptable levels. All of the above greatly adds to the expense of each single package.

Another approach to providing graphics within the bag would involve the application of the graphics directly to the inside metalized layer 16 shown in Figure la. The application of such graphics can be accomplished using an inkjet printer. However, this method likewise raises a capacity issue, since present technology converters produce packaging film at a speed of 1500 to 2000 feet per minute, while the capacity of present inkjet printer heads is approximately 300 feet per minute. Additional modification to converters must be made in order to keep the inkjet printing in register with the graphics formed by the ink layer 12. All of the above considerations again add to the cost of the package. In addition, the United States Food & Drug Administration does not presently allow for the use of an ink-carrying layer that comes into contact with a fatty food.

Another prior art approach to this issue is illustrated in Figure lb, which is again a schematic cross-section of a packaging film. As with the embodiment shown in Figure la, the embodiment shown in Figure lb comprises an outside OPP layer 10 followed by an ink layer 12, a laminate layer 14, and a metalized OPP or PET layer 16. However, an additional laminate layer 14' is applied to the metalized layer 16 so that an additional ink layer 12' and OPP or PET layer 10' can be used as the new inside layer 10'. The use of the ink layers 12, 12' as the second to last layer on both the outside and inside of the package allows for a full graphics capability on both the outside and the inside of the film. The additional film, however, adds approximately sixty percent (60%) to the cost of the material when compared with the embodiment shown in Figure la. Overall capacity is also cut in half, since the film must be run through a typical converter twice. Further, since the material is 60% thicker, it cannot be run on a vertical form and fill machine at speeds as high as that used to make packages out of the embodiment shown in Figure la. This is because longer dwell times must be used to form all the seals involved. As with the inkjet printer solution, the embodiment shown in Figure 2a also requires additional efforts to keep the inside graphics and outside graphics in registration. Importantly, the embodiment shown in Figure lb again places ink inside a functional barrier layer, the metalized layer 16, which is not presently permitted for direct contact with many foods by the United States Food & Drug Administration.

In addition to ink and solvent concerns with package construction, packages, particularly with snack foods, benefit from marketing. With current packaging, inserts or other graphics, such as coupons and game pieces, are separately packaged and deposited into snack food packages or are temporally adhered to the exterior of the packages. With the former, inserts are hidden from consumers hindering the effectiveness of the promotion. With the latter, graphic materials adhered to package exteriors can be dislodged and lost. Consequently, a need exists for a package construction and method that allows for a package to self-contain inserts, graphic materials, and other products separated from the main compartment of the package. Thereby, flexible package constructions would benefit have a separate compartment for placement of materials with graphics so as to avoid or, at least minimize, ink and solvent contact with food in addition to marketing benefits.

SUMMARY OF THE INVENTION

The proposed invention involves producing a package made from flexible film having a film body formed as a discrete package. A pocket for containing materials separate from a main portion of the package is formed on and along a portion of the package. To achieve this, the pocket is formed from a continuous segment of film laid against the main portion of the package. Thereby, the package can be filled with a first product such as snack chips while the pocket is filled with a printed material or other food product for example. Advantageously, the first product is kept separate from the second product placed in the pocket. This avoids any product-to-product contamination.

One method for forming a package with a pocket comprises forming a sheet of film into a tube with an overlapped segment of film extending out and over the tube to form the pocket. Thereafter, at least two seals are formed longitudinally along the overlapped segment of film forming the pocket. Sealing both terminal ends of the tube and the pocket finishes the package. Optionally, a multiple pockets can be formed along the exterior of the package by providing more than two longitudinal seals.

The above as well as additional features and advantages of the present invention will become apparent in the following written detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will be best understood by reference to the following detailed description of illustrative embodiments when read in conjunction with the accompanying drawings, wherein:

Figures la and lb are schematic cross-section views of prior art packaging films;

Figure 2 is a schematic cross-section view of a tube of packaging film illustrating the formation of a prior art lap seal;

Figure 3 is a schematic cross-section of a tube of packaging film illustrating the formation of a prior art fin seal;

Figure 4 is a cross-sectional view of a package having a pocket made in accordance with an embodiment of the invention; and

Figure 5 is a top perspective view of the package in Figure 4 showing an article contained within the pocket.

DETAILED DESCRIPTION

Figure 4 shows a cross sectional view of a flexible package 50 for containing snack food products. The composition of the package material can be the same as used for prior art packaging as described in relation to Figure la or any other prior art film composition used for the product application in the instant invention.

A film 52 used in the present invention is fed into a vertical or horizontal form, fill, and seal packaging machine capable of manufacturing a package in accordance with the invention. Thereby, package 50 is formed having a front 54 and a back 56. Since film 52 is a flat film, film 52 is fed into the packaging machine generally to form a cylinder. The leading end of the film is sealed to a trailing end of the same film to form a first back seal 62 rendering the cylinder independent. A second back seal 64 is formed parallel to first back seal 62 with a segment of film 52. In one embodiment, back seals 62, 64 are simultaneously formed parallel to each other forming pocket 60, which is separate from a main portion 58 of package 50. Pocket 60 is formed such that it is separate from inside portion 58 and can retain separate product or contents. Once package 50 is complete, a transverse end seal 68 can be formed at both ends of package 50.

Back seals 62, 64 are unlike prior art seals in that it is not merely a thin seal of overlapped film. Here, film 52 is wrapped to form pocket 60. More particularly, pocket 60 is formed, for example, by allowing terminal ends from a sheet of film 52 to extend over and above from the formed cylinder. Alternatively, film 52 can be wrapped to extend inward against the formed cylinder to form a pocket (not shown)., The portion of film 52 that is laid above back 56 to form pocket 60 is external portion 61. Back seals 62, 64 can then be optionally formed longitudinally down the length of the tube. Back seals 62, 64 can extend down from one terminal end of package 50 to the other end to form pocket 60. However, other embodiments are possible such as adding additional transverse seals across the overlapped portion of film 52 to form an abbreviated pocket or multiple pockets.

Generally, the terminal segments of external portion 61- are sealed to transverse seals 68 of package 50 as shown in Figure 5, which is a top perspective view of package 50. This forms the top and bottom seals of discreet package 50 wherein product may be stored. The transverse seals of pocket 60 that coincide with traverse seals 68 extend from the position where portion 61 extends forth from first back seal 62 and end at second back seal 64. Thereby, portion 61 is positioned above back 56. In another embodiment, one or more additional seals (not shown) can be formed between first and second back seals 62, 64. Thereby, pocket 60 can be separated into two or more distinct pockets. This would be advantageous if additional items need to be packaged separate from each other and from the products in main portion 58.

As package 50 is comprised of a flexible material, portion 61 will generally lie flush against back 56 unless pocket 60 is filled with product. As pocket 60 is filled with product, portion 61 will extend out and away from back 56. Even with product held in pocket 60, portion 61 appears to be substantially flush or flat when compared to the remaining exterior of package 50.

Shown in Figure 5 is a printed material 66. Material 66 can comprise items such as coupons, contest materials, or pamphlets. With food products contained in the portion 58, having pocket 60 is advantageous, as the printed materials would not come into with it thereby avoiding any ink to food contact. This allows quick access to any materials placed within pocket 60 without disturbing the product within portion 58. An alternative advantage of pocket 60 is that other food products can be kept separate from the main contents of package 50 in portion 58. This allows separate food samples, dips, or salsas to be stored in pocket 60 and accessed separately when the consumer desires. Another alternative use for pocket 60 is to fill it with air so that pocket 60 can form an air-pillow. With an air-pillow, multiple packages can be placed on top of each other such that the air-pillow separates each package 50. This deters any product breakage because υf the cushioning effect.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

CLAIMS:What is claimed is:

1. A flexible package, comprising: a film body formed as a discrete package for containing a first product; and a pocket for containing a second product from a main body of the package containing the first product wherein the film body and the pocket are produced from a continuous segment of film.

2. The flexible package of Claim 1 wherein the package is formed from a loop of the continuous segment of film having the first and second products placed within the package prior to sealing both terminal ends of the loop.

3. The flexible package of Claim 1 wherein a back seal is formed axially along the package to form the main body.

4. The flexible package of Claim 3 wherein the pocket is formed from overlapped film body positioned adjacent to a portion of the main body.

5. The flexible package of Claim 4 wherein the pocket begins at a first back seal and extends axially to at least a second back seal.

6. The flexible package of Claim 5 wherein terminal ends of the pocket are sealed to portions of terminal ends of the package.

7. The flexible package of Claim 5 wherein one or more additional back seals are provided to form one or more additional pockets.

8. The flexible package of Claim 1 wherein the second product is a printed graphic or food product.

9. The flexible package of Claim 1 wherein the second product is air.

10. A method for forming a package with a pocket, comprising: forming a sheet of film into a tube with an overlapped segment of film extending adjacent to the tube to form a the pocket; providing at least two seals longitudinally along the pocket; and sealing transversely both terminal ends of the tube and the pocket to form a flexible package with pocket.

11. The method for forming the package of Claim 10 further comprising placing product within the package prior to sealing the package at both terminal ends of the tube.

12. The method for forming the package of Claim 10 wherein the pocket is formed by extending the film outwardly and over the main body of the tube to a predetermined length.

13. The method for forming the package of Claim 10 wherein the pocket is formed along a back portion of the tube.

14. The method for forming the flexible package of Claim 10 further comprising positioning a printed graphic or food product within the pocket prior to forming the transverse seals at the terminal ends.

15. The method for forming the flexible package of Claim 10 wherein at least one additional seal is formed longitudinally between the at least two longitudinal seals to form at least two pockets over the main body of the tube.