MXPA06014529A - Storage bag - Google Patents

Abstract

The present invention provides a storage bag (10) including a bag body including two opposing sidewalls (12, 14) , the sidewalls including peripheral edges (15,18) and the sidewalls being attached together along at least a portion of the peripheral edges. Each of the sidewalls include an outer surface and an inner surface, where the inner surfaces (38, 40) define opposing inner faces, and at least one of the inner faces includes a pressure sensitive composite material (41). In accordance with another aspect of the invention, a process for forming a storage bag material is provided including the steps of:providing a sheet of base film;providing a pressure sensitive composite material having an adhesive on one side thereof;moving the sheet of base film and the pressure sensitive composite material into overlaying engagement;and attaching the pressure sensitive composite material to the sheet of base film.

Description

STORAGE BAG FIELD OF THE INVENTION The present invention relates to storage bags suitable for containing and protecting various items such as food. The present invention also relates to a process for forming a material suitable for manufacturing a storage bag of the present invention.

BACKGROUND OF THE INVENTION The use of storage bags to contain items to be stored, such as food, is generally known in the industry. These storage bags include various sizes of freezer bags useful for keeping food, such as meat, sealed in the freezer. Conveniently, those bags have a reusable or re-closing closure effective to provide a watertight seal. In addition, when using these storage bags it is convenient to eliminate the air contained within them and seal the opposite sides of the bags so that the air does not re-enter in such a way as to minimize the contact of the contents of the bag with air and the possibility of freezer burn, as can happen when a food stored in a low humidity freezer is dehydrated. Examples of known storage bags include those described in U.S. Pat. num. 5,403,094; 5,804,265; 5,965,224; 6,156,363; 6,371, 643 and 6,550,966.

There remains a need for a storage bag suitable for containing items stored in a freezer and within which an article can be kept sealed and that the contact of that article with the air is minimal.

BRIEF DESCRIPTION OF THE INVENTION According to one aspect of the invention there is provided a storage bag which includes a bag body comprising at least two opposite side walls which include peripheral edges and which are joined to one another along at least a portion of the bags. peripheral edges. Each side wall includes an outer layer and an inner layer and the inner layers define opposite internal faces. At least one of the internal faces comprises a pressure sensitive composite material for attaching that inner face to the other. According to one aspect of the invention there is provided a storage bag which includes a bag body comprising at least two opposite side walls which include peripheral edges and which are joined to one another along at least a portion of the bags. peripheral edges. Each side wall comprises an outer surface and an inner surface; the interior surfaces of the side walls are facing one another. At least one of the inner surfaces comprises a pressure-sensitive composite material for joining at least the two side walls opposed to each other. In accordance with another aspect of the present invention, a process for forming a storage bag material comprises the steps of: providing a sheet of base film; provide a pressure-sensitive composite material that in a side has an adhesive; moving the base film sheet and the pressure-sensitive composite material to fit in an overlapping relationship; and joining the pressure sensitive material to the base film sheet.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a front elevational view of a reclosable storage bag according to the teachings of the present invention; Figure 2 is a cross-sectional elevation view taken along line 2-2 of Figure 1; Figure 3 is an enlarged view of a section taken on line 3-3 of Figure 2 illustrating an inner layer of the storage bag of Figure 1; Figure 4 is a sectional view in enlarged elevation of the inner layer illustrated in Figure 3; Figure 5 is a perspective view of the storage bag of Figure 1 containing a hermetically sealed article inside the storage bag; Figure 6 is a cross-sectional elevation view of an alternative configuration of the storage bag of Figures 1 and 2; Figure 7 is a perspective view of the storage bag of Figure 6 containing an article sealed within the storage bag; Figure 8 is a front elevation view of an alternative embodiment of the reclosable storage bag according to the teachings of present invention; Figure 9 is a cross-sectional elevation view taken along line 9-9 of Figure 8; Figure 10 is a front elevation view of another reclosable storage bag embodiment according to the teachings of the present invention; Figure 11 is an elevation cross-sectional view taken along the line 1 1 -1 1 of Figure 10; and Figure 12 is a schematic view illustrating a process for forming a storage bag material for the present invention.

DETAILED DESCRIPTION OF THE INVENTION With reference to Figures 1 and 2 a reclosable storage bag 10 is illustrated according to the teachings of the present invention. The storage bag 10 generally includes two opposite side walls 12, 14 which are joined to one another along a portion of a periphery of the side walls 12, 14, for example along seams of the longitudinal edge 16, 18 and along a laterally extending bottom edge 20. In the storage bag 10 illustrated, the longitudinal edge seams 16, 18 may be formed by sonic welding, heat sealing, an adhesive or other conventional attachment means to along the edges of the material forming the side walls 12, 14 and the bottom edge 20 can be defined by a fold in the material forming the side walls 12, 14. In addition, the bottom edge 20 can also include a edge seam formed in a manner similar to the seams of the longitudinal edge 16, 18.

An upper end of the bag 10 includes an open mouth 22 for inserting articles into the interior of that bag 10. On the inside of the side walls 12, 14 of the mouth 22 there is a reusable closure 24 comprising complementary coupling elements 26. , 28 to seal the mouth 22 of the bag 10 so that it can be closed again. For example, the reusable closure may comprise a latch of the latch type which may include a slider to facilitate opening and closing of the bag 10. The present invention is not limited to the illustrated reusable closure, and some examples of suitable reusable closures and Information on their manufacture is described in U.S. Pat. num. 4,186,786; 4,285,105; 4,363,345; 4,561, 109; 5,804,265 and 5,851,070. Other closures may also be provided within the scope of the described invention. With reference to Figure 2, each side wall 12, 14 forming the bag 10 comprises several layers including a first layer 30 and a second layer 32 for the side wall 12 and a first layer 34 and a second layer 36 for the wall side 14. The first layers 30, 34 define an outer film surface of the bag 10 and the second layers 32, 36 define an inner film of the bag 10 which is attached to the article. The second layers or inner layers 32, 36 comprise a composite material with the characteristics necessary for the interior facing surfaces 38, 40 of the inner layers 32, 36 to adhere to each other. Alternatively, if one of the second layers 32, 36 is omitted, the second remaining layer will adhere to the opposite nonadherent inner surface of the first layer. By way of example, the internal layers 32, 36 are formed of a pressure-sensitive composite material 41 (Figure 3) which has the characteristic of releasably adhering to a surface of material in contact adjacent to the pressure applied, but which does not adhere to that surface when pressure is not applied. These composite materials are known in the industry and include films formed with a plurality of projections 42 and valleys 44 (Figure 4), for example by means of an engraving operation, wherein the valleys 44 of an adhesive side of the film are at least partially filled with pressure-sensitive adhesive 46 The projections 42 prevent the adhesive 46 from engaging an adjacent surface until sufficient pressure is applied on the side of the film opposite the adhesive side by which at least some projections 42 sink and allow contact of the adhesive with the adhesive. adjacent surface so that the composite material and that adjacent surface adhere. As described, the modality of the commonly preferred composite material may include raised protrusions or raised flat areas around small pits to prevent the adhesive from prematurely sticking to an adjacent surface. However, other forms of composite materials including a non-adhesive material can also be used according to the present invention so that the adhesive does not adhere or bond to an adjacent surface prior to the application of pressure. Illustrative materials include, but are not limited to, non-stick coatings such as silicone-coated paper or coatings, inks, varnish, particles (talc, calcium carbonate, starch, wax globules and the like), non-woven fabrics, lightweight fabrics and fibers that they are mixed with the adhesive or coated on it. The adhesive and / or non-adhesive coatings can be continuous or discontinuous (different). Pressure-activated solid adhesives may also be used and these include, but are not limited to, microencapsulated adhesives coated continuously or in different patterns on a film. In the case of microencapsulated adhesives and the like, pressure is applied to break the surface of the microcapsules and put the adhesive in contact with an adjacent surface. Other details and examples of those composites and information on their manufacture are disclosed in U.S. Pat. num. ,662,758; 6,489,022; 5,871, 607; 6,194,062; 5,965,235; 6,193,918 and 6,602,454; in the U.S. patent application publication. no. 2003/0218274 A1 and in the U.S. patent application. no. of series 10 / 345,540 entitled "Selectively Activatable Storage Wrap Sheet Having Discrete Land Areas" (canvas of storage wrapper having areas of distinct flat parts and that can be activated selectively) filed on January 16, 2003 and assigned to the assignee of the present application. However, one with experience in the industry knows that other forms of composite materials can be used that have an adhesive disposed thereon in accordance with the present invention and that include any material in which the adhesive is disposed continuously or discontinuously. The complementary elements 26, 28 of the reusable closure 24 are located on opposite internal faces of the outer layers 30, 34 of the side walls 12, 14, and the composite material 41 of the inner layers 32, 36 define upper edges 48, 50 that in the figures are shown spaced apart from the reusable closure elements 26, 28. The outer layers 30, 34 also include opposite longitudinal edges that are defined by the seams of the longitudinal edge 16, 18, and the inner layers 32, 36 include longitudinal edges. 49, 51 located within a seam area defined by the seams of the longitudinal edge 16, 18. When using the storage bag 10, the side walls 12, 14 are pressed to each other in areas surrounding the contents of the bag of storage 10 (see Figure 5) and thereby air is expelled from the storage bag 10 and the inwardly facing surfaces 38, 40 of the inner layers 32, 36 are coupled to each other. When the pressure applied to the side walls 12, 14 to join them is sufficient, that pressure can cause the adhesive of each facing surface 38, 40 to move to engage the facing surface opposite 40, 38 and adhere to it, and thereby maintain the inner layers 32, 36 coupled to each other and prevent the air from re-entering the adhered areas. In one embodiment, the outer layers 30, 34 may comprise films formed of low density polyethylene (LDPE) having a thickness of about 0.1 to 10.0 mils (0.0254 to .254 mm) and preferably about 1.5 to 2.0 mils (0.0381 and 0.0508 mm). The inner layers 32, 36 may comprise high density polyethylene (HDPE) films having a thickness, without engraving, of approximately 0.25 to 2.0 mils (0.00635 to 0.0508 mm) and an engraved caliper of approximately 4.0 mils (0.1016 mm). Accordingly, the LDPE material of the outer layers 30, 34 provides an exterior surface of the storage bag visually similar to commercially available storage bags known to be available. However, it should be mentioned that other film materials and thicknesses can be used for any of the layers of the side walls 12, 14. Examples of materials that can be used for the outer layers 30, 34 include, but are not limited to, thermoplastic materials or a mixture of thermoplastic materials. The films can be made by means of a conventional film molding or blowing process. Suitable thermoplastics include, but are not limited to, polyolefins such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and polypropylene (PP); thermoplastic elastomers such as styrenic block copolymers, blends of polyolefins, elastomeric alloys, thermoplastic polyurethanes, thermoplastic copolyesters and thermoplastic polyamides; polymers and copolymers of polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymers of sarán, copolymers of ethylene vinyl acetate (EVA), cellulose acetates, polyethylene terephthalate (PET), ionomer (Suriyn®), polystyrene, polycarbonates, styrene acrylonitrile, aromatic polyesters, linear polyesters, nylon, polyvinyl alcohols thermoplastics; sheet metal and metalized films. Examples of materials that can be used to form the composite material 41 for the inner layers 32, 36 include, but are not limited to, sheet metal such as aluminum foil, wax paper or parchment paper, polymeric films, non-woven fabric webs, fabrics, paper and combinations of these. Some non-limiting examples of polymeric films include polyolefin films such as polyethylene including high density, low density or low density linear polyethylene; ethylene copolymers such as ethylene vinyl acetate (EVA) or ethylene methyl acrylate copolymer (EMA), polyethylene terephthalate (PET), polyethylene terephthalate glycol copolymer (PETG); polypropylenes, polyethylene-propylene copolymers; polymers and copolymers of polyvinyl chloride (PVC), polyvinylidene chloride (PVDC); polystyrene; nylon, and other polymeric films of similar properties. The combination of outer layers 30, 34 around the inner layers 32, 36 provides the storage bag 10 with a double wall structure in which the outer layers 30, 34 form an outer bag that provides a first barrier or seal for the contents of the storage bag 10 when the reusable closure 24 is closed, and the inner layers 32, 36 provide a second barrier or seal to prevent or minimize the contact of the air with the contents of the storage bag 10 when the inner layers 32 , 36 are pressed to each other. The inner layers 32, 36 of the storage bag 10 are bonded to the adjacent outer layers 30, 34 through substantially the entire surface area of the inner layers 32, 36, as may occur when combining the composite material 41 with the film material forming the outer layers 30, 34 on extruding and forming the film material for the outer layers 30, 34 as described below. Alternatively, the inner layers 32, 36 and the outer layers 30, 34 they can adhere to each other through an adhesive, a static combination or other known means for joining two layers of material. With reference to Figure 6, an alternative configuration for the storage bag 10 identified with the reference number 10 'is illustrated, and in which the elements corresponding to the above configuration are identified with the same reference numbers, but with the premium sign. As in the previous configuration of the storage bag 10, the storage bag 10 'comprises two opposite side walls 12', 14 '; each side wall 12 ', 14' comprises multiple layers including a first layer 30 'and a second layer 32' for the side wall 12 'and a first layer 34' and a second layer 36 'for the opposite side wall 14'. The inner layers 32 ', 36' are connected to each other and to the outer layers 30 ', 34' along the longitudinal seams 16 ', 18' (Figure 7), and are also alternately joined in an edge seam at length of the bottom edge 20 'formed similarly to the longitudinal seams 16', 18 '. In addition, lateral seams are provided at the upper edges 48 ', 50' between the inner layers 32 ', 36' and the outer layers 30 ', 34'. The inner layers 32 ', 36' may comprise a composite material wherein the inner faces 38 ', 40' of the inner layers 32 ', 36' may include a pressure sensitive composite material 41 of the same type described for the above configuration of the storage bag 10. As seen in Figure 6, the inner layers 32 ', 36' are practically unbonded to the outer layers 30 ', 34' in the area located between the longitudinal seams 16 ', 18' and between the upper edges 48 ', 50' and the bottom edge 20 '. Accordingly, the inner layers 32 ', 36' can be moved independently of the outer layers 30 ', 34' to fold and adequately conform to the contents of the bag. storage 10 'and thereby eliminating contact of the contents of the bag with the air. Accordingly, the described storage bag 10 'combines the protective and user-friendly functions of such a bag and the pressure-sensitive composite material 41 gives it the property of conforming to the contents. The storage bag 10 'can be used in a manner similar to that described for the storage bag 10, where a user can apply pressure on the side walls 12', 14 'of the bag 10' to make the inner faces 38 ' 40 'of the inner layers 32', 36 'adhere to each other and thereby eliminate or minimize the contact of the air with the contents of the bag 10', as illustrated in Figure 7. The material of the inner layers 32, 36 provides dropping characteristics or conformability and therefore the inner layers 32, 36 act as a wrap that conforms to the contour of the contents of the storage bag to minimize contact of the air with the contents. With reference to Figures 8 and 9, an alternative embodiment for a storage bag 52 according to the teachings of the present invention is illustrated. The storage bag 52 includes two opposite side walls 54, 56 that are joined to one another along a portion of a periphery of the side walls 54, 56, for example along longitudinal edge seams 58, 60. and along a laterally extending bottom edge 62. The longitudinal edge seams 58, 60 can be formed by sonic welding, heat sealing, an adhesive or other conventional bonding means along the edges of the material forming the side walls 54, 56 and the bottom edge 62 may be defined by a fold in the material forming the sidewalls 54, 56. In addition, the bottom edge 62 may alternatively include an edge seam formed in a similar manner to the edges thereof. longitudinal edge seams 58, 60. An upper end of the storage bag 52 includes a mouth open 64 for inserting articles into the interior of that storage bag 52. On the side walls 54, 56 of the mouth 64 there is a reusable closure 66 comprising complementary coupling elements 68, 70 for sealing the mouth 64 of the storage bag 52 so that it can be closed again. In the illustrated example, the reusable closure 66 comprises a slider 72 for handling the complementary coupling elements 68, 70 to the closed and open positions. However, it should be understood that a seal of the hook seal type may be provided, as illustrated in Figures 1 and 2 or any other resealable closure, for example as described in the patents mentioned above in connection with the closing devices. As shown in Figure 9, each side wall 54, 56 comprises a film layer formed of a composite material having a feature whereby the inward facing surfaces 74, 76 of the respective side walls 54, 56 adhere to each other. each other in a lofty way. By way of example, the side walls 54, 56 are formed of a pressure-sensitive composite material which has the characteristic of releasably adhering to a surface of material in contact adjacent to the application of a pressure, but which does not adhere to that pressure. surface when no pressure is applied, as a composite material made according to the teachings mentioned above with respect to the composite material 41 described for the inner layers of the storage bags 10, 10 '. Alternatively, one of the side walls 54, 56 may be formed of a pressure-sensitive composite material such as a composite made according to the teachings mentioned above with respect to the composite material 41 and the opposite side wall 54, 56 may be formed from a non-stick surface as a smooth material surface where a wall of the side walls 54, 56 will adhere to the opposing non-adhesive surface to form a seal that is formed around the contents of the storage bag 52. Accordingly, the storage bag 52 described provides dropping characteristics and the ability to conform around the contents of the storage bag 52 for practically isolating the contents of that bag from the air, and at the same time facilitates the use of a storage bag structure that includes a reusable closure 66 for sealing the mouth of the storage bag 64. It should be mentioned that the material forming the side walls 54, 56 of the storage bag 52 comprises an HDPE film, although other film materials can also be used that provide the same characteristics of the composite material as those associated with the pressure sensitive composite material 41. For example, for the walls side 54, 56 can be provided the materials described above for the material c omitted from the inner layers 32, 36. Referring to Figures 10 and 11 there is illustrated an alternative embodiment for a storage bag 78 according to the teachings of the present invention. The storage bag 78 includes two opposite side walls 80, 82 that are joined to one another along a portion of a periphery of the side walls 80, 82, for example along longitudinal edge seams 84, 86. and along a laterally extending bottom edge 88. The longitudinal edge seams 84, 86 can be formed by sonic welding, heat sealing, an adhesive or other conventional bonding means along the edges of the material forming the side walls 80, 82 and the bottom edge 88 may be defined by a fold in the material forming the side walls 80, 82. In addition, the bottom edge 88 may alternatively include an edge seam formed in a manner similar to longitudinal edge seams 84, 86. 1 An upper end of the storage bag 78 includes an open mouth 90 for inserting articles into the interior of the storage bag 78. A reusable closure 92 comprising complementary coupling elements is attached to the side walls 80, 82 of the mouth 90. 94, 96 to seal the mouth 90 of the storage bag 78 so that it can be reclosed. In the illustrated example, the reusable closure 92 comprises a seal of the hook seal type. However, it should be understood that a slide type closure can be provided, as illustrated in Figures 8 and 9 or any other reusable closure, for example as described in the patents mentioned above in relation to the closure devices. The storage bag 78 includes a strip-like secondary seal 98 separated from the reusable closure 92. The secondary seal 98 comprises respective secondary seal elements 100, 102 located on inward facing surfaces 104, 106 of the side walls 80, 82 just below of the complementary elements 94, 96. Secondary seal elements 100, 102 illustrated comprise a composite material having a feature by which the internal faces 108, 110 of the secondary seal elements 100, 102 adhere to each other releasably . For example, a composite material having the property of adhering to a surface of material in contact adjacent to a pressure applied, but not adhering to that contact surface when no pressure is applied can be provided for the secondary seal elements 100, 102, such as a composite material made according to the teachings mentioned above with respect to the composite material 41. Obviously, to form the secondary seal 98, only one of the secondary seal elements 100, 102 could also be used. In addition, the secondary seal elements 100, 102 can be provided individually as continuous and / or discontinuous elements and when combined they provide a continuous or discontinuous secondary seal 98 as a person could recognize. of ordinary skill in the industry. The side walls 80, 82 of the storage bag 78 may be formed of a LDPE film or any of the films described herein with reference to the outer walls 30, 34 of the storage bag 10. The seal elements Secondary 100, 102 may be made of an HDPE film or any of the films described with reference to the composite material 41 forming the inner walls 32, 36 of the storage bag 10. Preferably, the secondary seal 98 provides a seal visually recognizable separate and different from the reusable closure 92. Alternatively, the secondary seal 98 may be within the same area as the reusable closure 92. The storage bag 78 provides a double seal against the entry of air into the interior of the storage bag 78 and also a double seal against odors entering or leaving the storage bag 78. The reusable closure 92 and the sealing element or secondary 98 of the double seal structure also provides an additional closure element for securing the contents of the storage bag 78 in case one of the seals is accidentally opened. In an alternative configuration of the storage bag 78 only the composite material of the secondary seal 98 can be provided in the mouth 90 of the storage bag 78 to provide that bag with a single resealable closure element. In other alternative configurations of the storage bag 78, the secondary seal of the composite material 98 may be located above the reusable closure 92; a pair of secondary composite material seals 98 can be provided, one on each side of the reusable closure 92; or a pair of secondary seals of composite material 98 can be provided as a first and second seals for the bag storage 78 without the reusable closure 92. In another alternative configuration of the storage bag 78, the secondary seal 98 may be formed of a reusable closure similar to the reusable closure 92. For example, the reusable closure of the storage bag 78 may it is a sliding type closure and the secondary seal 98 may comprise a latching seal closure. Alternatively, the two closure elements 92 and 98 may comprise a latch seal closure. The embodiments described above provide the bag with a structure suitable for eliminating or minimizing air contact with the contents of a storage bag and that is particularly advantageous in the case of storage bags used to freeze food such as meat. In addition to the composite material described above incorporated in the structure of a bag, at least one of the walls of the bag may include a conduit, such as a valve conduit (not shown) so that suction may be applied in order to evacuate the air from inside the storage bag. The valve conduit may be located anywhere in the bag, under the latch or as a part thereof, but is preferably near the top of the bag. The film opposite the valve and located near the valve conduit preferably contains no adhesive and its texture causes the film opposite the valve to not block the opening to the valve conduit or significantly restrict the flow of air through that conduit. The valve conduit can be any opening located in the bag that allows air to pass through the wall of the bag. Preferably, the valve is unidirectional such that air can not return to the bag. However, a person of skill in the industry could select a particular valve or valve structure that provides the final product with the desired function.

In addition to being removed through a valve conduit, air can be removed through the primary opening of the bag prior to closing the engagement strips. A useful method for this is to use a suction nozzle placed in the partially closed bag by means of which the bag is held firmly around the nozzle, for example with the help of jaws. Another method for removing air through the primary opening of the bag is to use a sealing device for food storage that has a small vacuum chamber (for example, as described in U.S. Pat. 4,941, 310). In both cases it is convenient to use a bag of the present invention whose interior surface has a texture, but which in the upper part has no adhesive in such a way that the air can flow properly. The applied suction exerts a force on the two sides of the bags by which those sides contact and are held together by means of the adhesive that is in the remaining portion of the bag. The two sides of the bag are held together and thereby air is adequately removed from the bag and air is restricted to that bag. Also, in one or more of the embodiments described above other materials may be incorporated as films formed of polymeric materials other than those specifically mentioned herein including so-called adhesion film materials to facilitate the closure of a storage bag by preventing the entry of air. With reference to Figure 12, a process for forming a storage bag material for the present invention is illustrated schematically and includes an extruder 1 12 followed by a die 1 14 to form a base material comprising a film layer 16. , as a LDPE layer of the film material in a molten or softened state, before a cooling step. The fluid film layer 116 is fed to a gripping line between a cooling roller 1 18 and a pressure roller. 120 located in a water bath 122. A layer of composite material, such as the etched composite material 41, is fed from a supply of material 124 to the nip between the cooling roller 118 and the pressure roller 120 such that the adhesive side of the composite material 41 is not facing the fluid film 116. The fluid film 1 16 is bonded to the composite material 41 as the two material layers 116, 41 pass through the gripping line of the cooling roller 118. and the pressure roller 120 to form a double layer material sheet 126 which can be used to form storage bags having an inner layer of composite material. The composite layer can be bonded to the base material by techniques known to those with experience in the industry, including thermal lamination, adhesive lamination, mechanical fastening as etching and the like. It is also contemplated that the base layer can be formed as a composite material in which pockets are formed from the resulting composite material. Another alternative embodiment of the storage bag of the present application may comprise a multi-bag having at least one inner lining bag and one outer supporting bag; the inner lining bag forms or has a composite material on at least one of its interior surfaces. The composite material can be formed with a pressure sensitive adhesive disposed thereon. If a pressure sensitive adhesive is used, a composite material useful for an alternative embodiment may be formed as considered in the embodiments described above. U.S. Pat. no. 5,804,265 contains additional information on appropriate multi-bag structures suitable for developing such a modality. Yet another alternative embodiment of the storage bag of the present application comprises a multilayer bag having at least one coating film and an outer support bag. The coating or films have a first wall lateral and a second side wall of which at least one shape or has a composite material thereon. A first end of the coating film is the only portion attached to an inner surface of the outer support bag and the second end of the coating is not attached to the outer bag. The length of the inner liner can be modified in such a way that the second end is approximately as long as the depth of the support bag or in such a way that the film is two or more times the depth of the outer support bag. U.S. Pat. no. 6,371, 643 contains additional information related to a storage bag structure having at least one inner film suitable for the elaboration of this embodiment. It is contemplated that storage bags made according to the teachings of the present invention may include any number of layers and that the films used to manufacture the bags by means of processes known in the industry including, but not limited to, coextrusion and lamination may have any number of layers. For example, ethylene vinyl alcohol or nylon copolymer layers can be used to improve the properties of the bags related to taste, aroma and oxygen barrier. In addition, one with experience in the industry will know that the individual layers or components comprising a single layer used for the bag of the present invention can be selected in such a way as to provide a specific functional or aesthetic requirement. In an illustrative but not limiting example, within the structure of a layer comprising the bag of the present invention a UV resistant layer can be provided to prevent photodegradation of a product that is inside the bag. All documents cited in this application are incorporated herein by reference; the mention of any document should not be construed as an admission that it constitutes a prior industry with respect to the present invention. Although the particular embodiments of the present invention have been illustrated and described, it will be clear to those skilled in the industry that various changes and modifications may be made without departing from the spirit and scope of the invention. It has been intended, therefore, to cover in the appended claims all changes and modifications that are within the scope of the invention.

Claims (10)

1. CLAIMS 1. A storage bag characterized by: A bag body comprising at least two opposite side walls; the opposite side walls include peripheral edges and the side walls are joined to one another along at least a portion of the peripheral edges; each of the side walls comprises an outer layer and an inner layer; and the inner layers define opposite internal faces, and at least one of the internal faces comprises a pressure-sensitive composite material for joining the internal faces opposite one another. The storage bag according to claim 1, further characterized in that the pressure sensitive composite comprises an adhesive coating located on at least one internal face. 3. The storage bag according to any of the preceding claims, further characterized in that at least one internal face comprises a plurality of slits; each of the slits has an adhesive disposed therein. 4. The storage bag according to any of the preceding claims, further characterized in that the two opposite internal faces comprise the pressure sensitive composite material. 5. The storage bag according to any of the preceding claims, further characterized in that a surface of each of the inner layers opposite the inner face is adhered to an inner surface of a respective outer layer. 6. The storage bag according to any of the preceding claims, further characterized in that the inner layers are bonded to the outer layers along peripheral edges of the inner layers. The storage bag according to any of the preceding claims, further characterized in that the bag body includes an opening and a closure element comprising complementary cooperating elements located in the opening. The storage bag according to any of the preceding claims, further characterized in that at least one internal face comprises projections and valleys adjacent to the projections, wherein said valleys are at least partially filled with adhesive. 9. The storage bag according to any of the preceding claims, further characterized in that the projections sink and allow contact with the adhesive in the valleys. 10. A storage bag characterized by: A bag body comprising at least two opposite side walls; the opposite side walls include peripheral edges and the side walls are joined to one another along at least a portion of the peripheral edges; each of the side walls comprises an outer surface and an inner surface; the inner surfaces of the side walls are facing one another; and at least one of the interior surfaces comprises a pressure-sensitive composite material for joining at least two opposite side walls to each other.