MXPA04008470A

MXPA04008470A - Laminated pet food bag.

Info

Publication number: MXPA04008470A
Application number: MXPA04008470A
Authority: MX
Inventors: D Cocozza David
Original assignee: Huhtamaki Consumer Packaging
Priority date: 2003-09-03
Filing date: 2004-09-01
Publication date: 2005-07-12
Also published as: US20050048232A1; CA2479480A1

Abstract

The present invention encompasses a laminated bag having a multi-ply structure and stain hiding abilities that prevent grease from bleeding through to the outer portion of the bag. More particularly, the present invention provides the construction of the bag and materials from which the bag is mad e. The multi-ply structured bag comprises an outer lamination play, an intermediate paper ply and an inside ply. The outer lamination ply being constructed by lamination of a clear film layer, a co-extruded white and gray polyethylene layer and a paper layer. The bag provides stain hiding characteristics, a bright outer appearance and a durable outer layer that will show less wear on the bag.

Description

LAMINATED BAG FOR PET FOOD FIELD OF THE INVENTION There are many types of bags to contain a wide variety of materials. The bags vary in size, in construction material, appearance, thickness of the walls of the bag and its use. You can think of the bags as containers for storing materials or for other purposes such as cooking food. Most bags that will be used to store products are typically formed from multiple layers of paper or other material to achieve a thickness that is suitable for this use. When multiple layers are used in the construction of a bag, generally, the layers are laminated together to have a multi-wall construction.

BACKGROUND OF THE INVENTION An example of a bag is a bag for pet food. Some prior art pet food bags are constructed with a layer of metallized paper on the outside of the bag to provide a more pleasing appearance for printing with multiple colors applied to the outside of the bag. When pet foods, which contain a certain amount of fat, are housed in these bags, usually the fat will drain through the multiple layers of the bags and They will stain the outside of the bag. This effect distorts, in some cases, destroys the appearance of the impressions in the bag.

These bags of the prior art present other problems. Specifically, the bags allow fat from pet food to foul the printed outer layer, which creates appearance problems in the bags. In order to solve this problem, some bag manufacturers introduced a fluorocarbon-based material to provide resistance to grease. These prior art pet food bags are constructed with a layer of bleached, clay coated paper which has the fluorocarbon material added to the base sheet of the paper layer to function as the grease repellent. In these and other types of bags, there is a layer of intermediate brown paper and a layer of polyethylene. However, other problems also arise because fluorocarbons create a health risk, therefore, its use is not desirable. In view of the foregoing, there is a need to eliminate the use of fluorocarbons in the construction of bags, while providing a solution that prevents the fat content from altering the aesthetic appearance of the bag. Up to this point, it is desirable to have an optimum material layer that generates brilliance that is equivalent to or better than the paper layer of the prior art. It is important, that when the paper layer between the plastic layer and the outer layer of the bag is saturated with grease and stain, the stain is not visible through the outer lamination layer.

BRIEF DESCRIPTION OF THE INVENTION The present invention provides a laminated pouch with a multi-layer structure and stain-hiding capability, which prevents grease from trickling through the outer portion of the pouch. More particularly, the present invention provides the construction of the bag and the materials from which the bag is made. In one aspect, the present invention provides a bag with a multilayer structure comprising an outer lamination layer, an intermediate paper layer and an inner layer, with the outer lamination layer constructed by laminating a transparent film layer, an Co-extruded polyethylene layer and a layer of paper. In another aspect, the present invention provides a white and gray co-extruded, co-extruded polyethylene layer that provides features for occulting fat in a bag constructed in accordance with the present invention. In another aspect, the present invention provides a method for providing a glossy outer lamination surface in a pet food bag to accept inks and lacquers, in order to provide a pleasing and decorative exterior appearance.

Also, in another aspect, the present invention provides a bag that provides features to hide stains, a glossy outer appearance and a durable outer layer that will provide less wear on the bag.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is described in detail below with reference to the accompanying drawings. Figure 1 is a perspective view of an embodiment of a bag in accordance with the present invention, shown in a straight position with the opening of the upper end for receiving the material. Figure 2 is a bottom view of the bag of Figure 1, taken along line 2-2 in section. Figure 3 is an exploded cross-sectional view of the external lamination layer of the bag of Figure 1.

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a multilayer bag with the ability to hide stains and the construction thereof. More particularly, the present invention is directed to forming and providing a bag with an outer appearance with bright colors. In addition, the bag eliminates the use of fluorocarbons and prevents the grease contained within the bag from slipping through the printed outer surface.

In a preferred embodiment of the present invention, a polyethylene layer is made with a co-extruded layer of a gray pigmented polyethylene and a white polyethylene. The gray and white polyethylene layer is extruded separately and attached to a single canvas as they pass through the dye. As will be understood by persons skilled in the art, the process is a process of extrusion lamination. In other words, for example, the extrusion leaves the die at approximately 315 ° C and is sandwiched between the paper and the polyester layer. The extrusion acts as a 10 adhesive for paper and polyester and also carries the pigment, which provides the characteristics to hide the stains from the layer. Having provided a brief description of the present invention, a more detailed description will be made with reference to the construction and components of the bag, with reference to the Figures 15 1 and 2. With specific reference to the drawings and to start with Figure 1, there is shown a perspective view of a bag that is constructed in accordance with the present invention and is usually marked with the number 10. bag 10 includes a pair of essentially rectangular front and rear panels 12 and 16, respectively. The front panel 12 and the rear panel 16 are joined at their opposite edges by reinforcing side panels 14 and 15. As can be seen in Figure 2, reinforced side panels 14 and 15 comprise first and second portions 14a, 14b and 15a, panel 15b, respectively. The panel portions 14a, 14b, 15a, and 15b are joined along the fold lines 14c and 15c respectively. The fold lines 14c and 15c allow the reinforcing side panels 14 and 15 to be folded inwardly with an accordion fold. When the bag 10 is folded into a flat collapsed configuration, the reinforcing panels 14 and 15 lie between the front panel 12 and the rear panel 16. In addition, the front panel 12, the rear panel 16 and the reinforcing side panels 14 and 15 are secured in an adhesive manner to close and seal the lower end (not shown) of the bag. In one embodiment of the present invention, the different panels 12, 14, 15 and 16 of the bag 10 are constructed with a multilayer structure. As shown in Figure 2, in a preferred embodiment of the present invention, the multi-layered structure of the bag 10 comprises an inner layer 18, an intermediate paper layer 20 and an outer lamination layer 22. Any kind of pictorial representations or impressions can be applied in the outer lamination layer 22. The construction of the outer lamination layer 22 is illustrated in the cross-sectional view of Figure 3. In general, the outer lamination layer 22 has inks applied on lacquers. A polyester layer of a 48 gauge is followed by a coextrusion layer 26. The coextrusion layer 26 may have about 26 pounds of white pigmented polyethylene and about five pounds of gray polyethylene. Indeed, the The total caliber of the coextrusion layer 26 is approximately two mils. As will be understood by persons skilled in the art, the weights and the total caliber indicated herein are merely exemplary. Other proportions of gray polyethylene and full thickness can be used to achieve the features of the present invention, and such proportions and thicknesses will be contemplated and within the scope of the present invention. The coextrusion layer 26 is laminated with a bleached, white paper with a basis weight of twenty pounds, which contains no fluorocarbon materials and is illustrated as the paper layer 28. In accordance with a method of the present invention, the white and gray coextrusion layer 26 contacts the layer 28 of bleached pulp paper. The gray and white coextrusion layer 26 is also in contact with a layer 24 of transparent film, which forms the outer surface of the outer lamination layer 22. The outer lamination layer 22 can be printed and then divided and manufactured in a bag machine by any of the conventional methods. The manufacture of the bag includes the application of several castings of hot adhesives to fix and join the multiple layers of the bag. In an exemplary embodiment of the present invention, the outer lamination layer 22 is laminated in line with a natural mat layer, shown as the intermediate layer 20. The intermediate layer 20 is also joined with an internal coating film, shown as the inner layer 18. This construction produces wall panels of the bag 10 of Figure 1. In the manufacture of the bag, while the component layers of the bag are made in separate canvases, the canvases are combined in a continuous canvas form before being cut. and glued to form the bag as described above. During use, the bag of the present invention provides anti-stain characteristics and protects the appearance of the exterior of the bag. The gray / white co-extrusion portion 26 of the outer lamination, which is in contact with the bleached-brown paper 28, begins to darken as soon as it comes into contact with grease or oil of the contents of the bag. The paper layer 28 becomes translucent and stains. However, the coextruded layer 26 of gray / white polyethylene does not allow the stain to be seen from the outside of the bag due to its composition and pigmentation. The bag of the present invention provides many more advantages over prior art bags. The film used in the construction of the outer laminate layer 22 is well adapted to accept inks and adhesives that are traditionally used on the outside of the bags, to improve the appearance and carry information. The coating and surface tension of the film also allow for ease of printing and fabrication. Another advantage of the present invention is the brighter and more white appearance of the outer lamination layer 22, i.e. the aesthetic impact. Another advantage of the outer lamination layer 22 of the present invention is its ability to withstand typical wear and tear, and is supported by the fact that the bag supports transportation, distribution and retailing process. In other words, a bag utilizing the outer lamination layer of the present invention has an undamaged appearance inside the tent, i.e. less visible damage to the outside of the bag. This allows the store owner to have products that use the inventive bags, on a shelf for a longer period. Another advantage of the present invention is the property of concealing stains provided by the outer lamination layer 22.

While the embodiments of the invention have been illustrated and described in detail, it should be understood that changes and modifications can be made to the invention without departing from the scope and purpose of the invention. The modalities described here are intended to be illustrative, better than restrictive. Other embodiments will be apparent to those skilled in the art within which the present invention is incorporated without departing from its scope. From the foregoing, it can be observed that this invention is well adapted to achieve the purposes and objectives set forth above, together with other advantages, which are evident and inherent to the system and method. It should be understood that certain characteristics and combinations will be useful and can be used without reference toother characteristics or sub-combinations. This is contemplated within the scope of the appended claims.

Claims

CLAIMS 1. A bag having a multilayer structure, characterized in that it comprises: an outer lamination layer; an intermediate paper layer; an inner layer; wherein the lamination layer comprises a transparent film layer, a co-extruded polyethylene layer, and a paper layer; wherein the transparent film layer, the co-extruded polyethylene layer and the paper layer are laminated to form an external lamination layer, and wherein the external lamination layer, the intermediate paper layer and the inner layer are joined and assemble to form a unitary wall structure to make the bag. 2. The bag according to claim 1, characterized in that the co-extruded polyethylene layer comprises two pigmented layers. 3. The bag according to claim 2, characterized in that the pigmented layers are approximately 2 mils thick. 4. The bag according to claim 3, characterized in that the co-extruded polyethylene layer comprises a first layer that is 85% thick and a second layer that is 15% thick. 5. The bag according to claim 4, characterized in that the first layer is a white pigment and the second layer is a gray pigment. The bag according to claim 1, characterized in that the bag has a front panel, a back panel and reinforcing side panels that join the front and rear panels. The bag according to claim 1, characterized in that the outer lamination layer hides spots of the intermediate paper layer. The bag according to claim 1, characterized in that the external lamination layer prevents runoff through one or more substances within the bag. 9. The bag according to claim 7, characterized in that one or more substances inside the bag is fat. The bag according to claim 1, characterized in that the outer lamination layer provides a brilliance that improves the appearance of the bag. The bag according to claim 10, characterized in that the external lamination layer has inks and lacquers applied to provide a pleasant and decorative exterior appearance to the bag. 12. The bag according to claim 1, characterized in that the unitary wall structure is used to provide a front panel, a back panel and reinforcement side panels, and wherein the front panel, the rear panel and the reinforcing side panels are united to form a bag with a single closed end and an open end. 13. A method for concealing stains in a laminated pouch, characterized in that it comprises: providing a multilayer structure for constructing the pouch; the multi-layer structure comprises: an outer lamination layer; an intermediate paper layer; an inner layer; wherein the external lamination layer is attached to the intermediate paper layer, which in turn is joined to the inner layer; and wherein the outer lamination layer has characteristics to hide the spots. The method according to claim 13, characterized in that the characteristic for concealing stains of the external lamination layer is achieved by constructing the external lamination layer with the use of a transparent film layer, a layer of co-extruded polyethylene. white and gray and a layer of paper. 15. The method according to claim 14, characterized in that the transparent film layer, the white and gray co-extruded polyethylene layer and the paper layer are laminated together to form the outer lamination layer. 16. The bag according to claim 14, characterized in that the white and gray polyethylene layer provides a mask of any stain that may appear on the paper layer. 17. The bag according to claim 13, characterized in that the paper layer does not contain fluorocarbons. 18. The bag according to claim 13, characterized in that the outer lamination layer provides a brilliance that improves the outer appearance of the bag. 19. A bag for housing pet food, characterized in that it comprises: a pair of front and rear panels with an essentially rectangular shape having upper and lower ends and opposite lateral edges; a pair of opposite side panels joining the opposite side edges of the front and rear face panels, each of the side panels having a longitudinal accordion fold defining longitudinal reinforcement folds in the side panels; a closure means at one end of the bag for securing the front and rear face panels and the pair of reinforcing side panels for closing one end of the bag; the front and rear face panels and the reinforcing side panels comprises a multi-walled structure formed of an outer lamination layer, an intermediate paper layer and an inner layer; The outer lamination layer provides a glossy appearance and features to hide stains. 20. The bag for housing pet food according to claim 19, characterized in that the external lamination layer comprises a transparent film layer, a layer of co-extruded polyethylene and a paper layer. 21. The bag for housing pet food according to claim 20, characterized in that the transparent film layer, the co-extruded polyethylene layer and the paper layer are laminated to form the external lamination layer and wherein the layer of external lamination, the intermediate layer of paper and the inner layer are joined and assembled to form a unitary multi-wall structure, to make the bag. 22. The bag according to claim 20, characterized in that the co-extruded polyethylene layer comprises two pigmented layers. 23. The bag according to claim 22, characterized in that the pigmented layers are approximately 2 mils thick. 24. The bag according to claim 21, characterized in that the co-extruded polyethylene layer comprises a first layer that is 85% of the thickness and a second layer that is 15% of the thickness. 25. The bag according to claim 24, characterized in that the first layer is a white pigment and the second layer is a gray pigment. A bag for housing pet food according to claim 19, characterized in that the external lamination provides a protection that results in the bag having less wear in the store. 27. The bag for housing pet food according to claim 19, characterized in that the external lamination provides a surface that allows printing and manufacturing thereof.