MXPA97009077A - Double cubie controlled atmosphere packaging - Google Patents

Abstract

The present invention relates to a package for a product, comprising: a product, a support member essentially impermeable to the gas holding the product, and a multi-layered tape sealed to the support member for enclosing the product, the tape comprising multi-layered a film essentially impermeable to gas, and a multi-layer film permeable to gas, and being delaminable within the multi-layer film, permeable to gas, the gas-permeable multilayer film being directly adjacent and sealed to the member of support so that, during delamination of the multilayer tape, a portion of the gas-permeable multilayer film remains sealed to the support member, while the remaining portion of the gas-permeable multilayer film separates from the support member along the g-impermeable film

Description

CONTROLLED ATMOSPHERE PACKING WITH DOUBLE COVER BACKGROUND OF THE INVENTION The present invention relates generally to packaging for fresh red meat. Particularly, this invention focuses on the packaging of food products in such a way that the packaged product can be kept in a condition under certain circumstances and then become another condition. Specifically, the gaskets in accordance with the present invention provide for the distribution of a packaged product in an environment with low oxygen level and the introduction of oxygen to the surface of a product in a supermarket or other marketing system. Such introduction of oxygen is achieved either by oxygen permeation through a film in contact with the surface of the product or through an exchange of atmospheric oxygen with a gaseous atmosphere with low oxygen content contained around the product. While you can pack a lot of products. In accordance with the teachings of this invention, said invention is especially advantageous in relation to the packaging of fresh red meat in such a way that the meat can be transported in an atmosphere with low oxygen level, i.e., preferably 0.5. % oxygen or less, more preferably 0.03% oxygen or less, and then causing it to start up when it reaches a supermarket, through exposure to oxygen. Historically, large suboriginal cuts of meat have been cut and packed in each supermarket. However, this can be inefficient and cause some undesirable additional costs. For example, all cuts from a large suboriginal part must be sold at once. On the contrary, it would be preferable to allow the meat to be cut and packaged in a central facility. in order to obtain the benefits of economy of scale and then send it to individual supermarkets as is done, for example, in the case of many poultry products. In the past, the goal of central processing of fresh red meat has not been achieved because many consumers prefer to buy meat that is reddened as a result of exposure to oxygen, however, the meat retains its reddish color for a long time. 3 days, and then it acquires a brown color that is undesirable for the "ayoria of the consumers. Therefore, if the meat were cut and packaged in a film per "is" the gases (then "permeable"), as is typical in retail, in a central location and if it was then sent to another location for eventual sale, in all likelihood, when the package reaches the place of retail sale, the meat would have already undergone transformation to brown and could not be sold effectively. Conversely, if the meat were cut and packed in a central location in a gas impermeable film (then "waterproof"), either under vacuum or with vacuum and a small amount of oxygen gas, and then if that meat was sent to another location for eventual sale, the meat would reach the retail place with a violet color that is typical of the meat before its exposure to oxygen. To date, marketing efforts to teach consumers about the non-damaging appearance of violet have been difficult. And, if the gas-impermeable film was a component of a conventional package that has a tray covered or covered with a film and that contains an atmosphere with a low oxygen content, the impermeable film would have to be removed and replaced by a permeable film in order to allow the meat to reach a bright red color before presenting itself to the consumer, eliminating a large part of the benefits of a central processing facility. Several packages have been developed in an effort to provide a means for transporting meat in a low oxygen environment and for quickly and easily introducing oxygen to the meat at the retail site in advance prior to its presentation to the consumer. One approach to solving this problem has involved the development of releasable films. That is to say, films that are delaminated easily in permeable and waterproof portions have been developed. Such a film is sealed on a support member, such as a tray, which contains the meat product, thus forming a gas-impermeable package for distribution. At the retail location, the gas impermeable portions are detached from the film leaving a permeable film sealed on the tray and, consequently, a gas permeable package that allows the meat to reach a bright red color due to to the exchange with atmospheric oxygen. The release film can be spread over the contained product and sealed on the periphery of the tray as a lid or it can be heated and placed on the product under vacuum to form a vacuum wrapping package. However, for both types of packaging, the main disadvantage is the relatively low gas transmission rate of the permeable film portion after the removal of the impermeable portion. That is, even when the permeable portion of the release film has a speed * gas transmission much higher than the transmission rate of ga «3 of the entire film before delamination, from 5,000 to 25,000 cc / m2 / 24 hours / atm. at a temperature of 22.7'C compared to 0 to 50 cc / m2 / 24 hours / atm. at 22.7ßC before delamination, they are still too low to allow the meat to turn red in a gaseous atmosphere with low oxygen level in a short period of time, except in areas of intimate contact between the permeable film and the meat. Most other approaches to achieve the goal of central processing of fresh red meat have involved the development of several double-woven packages of the type that have a permeable film that covers the meat product and a waterproof film that is removed on the spot. retail, covering the permeable film, where the permeable film and the waterproof film are separate, unrelated films. Examples of these types of packaging include double-deck gaskets where a permeable film is wrapped around the meat and its supporting member and an impermeable film is wrapped around the permeable film; double-layer packages including a permeable layer and a sealed impermeable layer on the periphery of the supporting member and packaging with a space above the meat allowing the introduction of a treatment gas, specifically nitrogen, carbon dioxide or h either a mixture of the two, between a permeable film adjacent to the meat product and a waterproof upper fabric. But, as in the case of the detachable films previously mentioned, each of these double-tea packages have an effectiveness called for by the permeability of the permeable film. Typical gas transmission rates for commercially viable gas permeable films are from 5,000 to 25.00 cc / m2 / 24 hours / atm. at a temperature of 22.7 ° C, which is too low for the meat to quickly achieve a red color by the release of gas and / or gases with low oxygen content and the entry of atmospheric oxygen. An additional package developed to allow central processing of fresh red meat includes a gas-impermeable top layer having a valve defined in the layer. The package may include a treatment gas between the packed meat and the upper layer during distribution, said gas being withdrawn through the valve and replaced with a gas with high oxygen content. Even though with this system it is possible to get the meat to turn red quickly, it has the disadvantage of requiring trained operators in the retail place and a relatively expensive equipment to exchange each (which eliminates the cost savings of The presence of the valve has the additional disadvantage of creating a package appearance different from the appearance that consumers are accustomed to seeing in the case of meat packing, and a gaseous space is required between the meat product and the waterproof film to maintain a red cast, which provides a packaging appearance not fully filled in. Another package has been developed to allow the central processing of the fresh red meat, and this packaging presents an excellent gas exchange and a rapid introduction of oxygen where a superior waterproof fabric covers a lower permeable tissue that and includes unsealed areas in the seal of the permeable tissue on the tray. However, the intermittent sealed and unsealed areas are formed by means of an altered sealing head comprising a series of sealing "dies" instead of a conventional continuous sealing surface. Accordingly, it is an object of the present invention to provide a package that allows central processing of fresh red meat with minimum processing required at the retail location. It is another object of the present invention to provide a package similar in appearance to the packaging that customers are accustomed to seeing for meat packaging.

E =; A further object of the present invention is to provide a package that allows fresh slit meat to quickly turn red. It is another object of the present invention to provide a package that must be assembled, filled and sealed in a central processing facility with conventional equipment. COMPENDIUM OF THE INVENTION These and other objects are achieved by providing a package for a product that includes a product, a waterproof support member that supports the product, a first film sealed on the support member to enclose the product, a device defined within the first film to exchange gases into the packaging and out of the package, said device for exchanging gases has a gas transmission rate of at least 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7 ° C, and a second impermeable film enclosing the first film and the device defined herein to exchange gases, in such a way that the removal of the second impermeable film provides gas exchange in and out of the packaging . Such objects are additionally achieved by providing a package for a product that includes a product, a waterproof support member that supports the product, a multi-layered fabric sealed on the support member to enclose the product, the multilayer fabric can be delaminated into a permeable portion and an impermeable portion with the permeable portion directly adjacent and sealed over the support member and the impermeable portion, whereby the permeable portion remains sealed on the support member upon delamination of the impermeable portion therefrom, and whereby the delamination of the impermeable portion from the permeable portion defines at least one channel within the permeable portion that permits a free flow of gases through at least one channel, in and out of the packaging. Such objects are also achieved by providing a package for a product that includes a product, a support member that supports the product, a first film sealed on the support bracket to enclose the product, a second impermeable film for enclosing the first film, breasts a defined channel within the first film and "sealed by the second impermeable film so that the removal of the second impermeable film allows" free flow of gases through at least one channel in and out of said package, and partly to close the anal after the gases flowing in and out of the packaging have reached a desired balance.

Such objects were additionally achieved by providing a package for a product that injects a product, a support member that supports the product, a first film sealed on the member to be cut, a second film sealed on a first film, a second film that It has a gas transmission rate of at least about 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7'C, the product is enclosed within the support member by the first film and by the second film, a third impermeable film for enclosing the first film and the second film, so the removal of the third Waterproof film allows a free flow of gases through the second film, in and out of the package. BRIEF DESCRIPTION OF THE DRAWINGS A detailed description of the preferred embodiments of the present invention is presented below, with reference to the accompanying drawings, wherein: Figure i is a perspective view of a package, in accordance with the invention; Figure 2 is a partial cross-sectional view of the package of Figure 1; Figure 3 is a partial cross-sectional view of another package in accordance with the present invention; Figure 4 is a partial cross-sectional view of another package in accordance with Dr { s.ßn. the present invention; Figure 5 is a view in Dßr nßr .. ... - in erspi-ectivvaa Haoe > u.nn additional packaging in accordance with the present invention; Figure 6 is a cross sectional view of the gasket of Figure 5; i. «A ™« is ", trt .." cut% pßnßwpMi dei ^^^ - fissure a ^ dß u rßmociin the tej ^ d ^^^ and the application of the patch; f fu, 7 is a perspective view of another package according to the present invention; Figure 8 is a view - »a •» e = nu courrtcee ttrr._a.n "isnveerrsaall de ~ .l? packaging of figure 7; and the figure? is a view in or to *. "cross section of another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The present invention focuses on a tray-type package suitable for the central processing of meat and fresh red meat including a support member or patent leather, or gas impermeable (then "waterproof") structure. ) na,,,. 'Upa rimera sealed film sobμ | r * e l * aa rc-? Na' rr. "Or the one that incinu-? .. HUß occlude a device * «-. *, .n u μr m? Tm -ar, pr.porcion? R an ipt > rcMbio - "-" '•' "** •" '< - ™ paqu-, and un4 W l ?? i ^ x. ue "tap" ,, .. ^ ^ ^ P ~ »nt ..« ^. cont i.nß co. Myor p retßrenc (gaseous atmosphere with low oxygen content such as a mixture of nitrogen / carbon dioxide.) Therefore, the removal of the impermeable film allows the release of the atmosphere with low oxygen content and the introduction of oxygen the packaged meat product The device for the exchange of gases defined within the first film can be defined perforations within the first film that are exposed by removing the impermeable film, an enlarged opening defined within the first film that is found exposed by removing the waterproof film and is covered with a patch or tag after an adequate period of time to allow a sufficient exchange of gases, or a highly permeable film, sealed over the first film, which provides a transmission area Exceptionally high gas content when removing the impermeable film. Turning to the first packing group, Figures 1 to 4 illustrate packages having several multilayer fabrics that can be delaminated in superior waterproof fabrics and perforated bottom fabrics. Such multilayer fabrics allow a simplified packing operation using conventional simple flange trays, a vacuum or preferably, a vacuum and application of gas with a low oxygen atmosphere, and the sealing of a single fabric over the tray rim in a single sealing step. At the retail location, the upper fabric layer is peeled off showing a perforated bottom layer having a gas transmission rate of at least about 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7'C, which allows a quick release of the atmosphere with low oxygen content, the introduction of oxygen for the immediate rearing of the packaged meat product. After wrapping, the package can optionally be coated with a gas permeable film as used for example in conventional retail coatings to act as dust protection for the packaged meat product. Turning to Figure 1, there is shown a package 10 according to the present invention that includes a support member or tray 12 having side walls 14 and a base 16 defining an internal cavity 18 for receiving product 20. A peripheral rim 22 is defined around the upper portions of the side areas 14. The multilayer fabric 26 is sealed on the tray at the rim 22. Figure 2 is a cross-sectional view of the package 10 of Figure 1 which includes a tray 12 with tissue 26 sealed on the flange 22. For the present modality, the fabric 26 is a single co-extruded multiple layer film that can be delaminated into waterproof and permeable portions. Films that can be delaminated in this way are well known in the art and are formed by the coextrusion of a multilayer film that includes two layers immediately adjacent to each other and demonstrating a weak bond strength between them. A preferred bond strength is equal to the peel forces to separate these adjacent layers of approximately 0.00906 kg to about 0.02265 kg. Accordingly, the fabric 26 is peeled off in an upper impermeable portion 28 and a lower permeable portion 30 as shown. The fabric 26 has partial perforations 32 defined therein that extend through the permeable portion of the film. Upon delamination, it can be seen that the permeable portion 28 is substantially free of such perforations. Accordingly, when a film or fabric is easily perforated for use in the package of the present invention, it is necessary to know the extent and thickness of the permeable and impermeable layers contained therein and for the perforations to extend through the layers. permeable but not, in any way, through the waterproof layers. That is, the perforations should be partially extended, to a limited extent, in the waterproof layers but should not interfere with the gas barrier properties of the impermeable portion of the multilayer film. Perforations that extend substantially but not necessarily fully through the permeable portion, often known as blind perforations, are also included. Accordingly, when the impermeable portion 28 6S detached, perforations 32 defined within the remaining permeable perforation 30 allow rapid exchange of gases and consequent reddening of the packaged meat product, as shown. It should be noted that the fabric 26 is a multilayer film that delaminates into permeable and impermeable portions to discover the permeable portion. increase the flow of gases in and out of the packaging. Also within the scope of the present invention is, though less preferred, the provision of a multilayer film that delaminates into two impermeable portions, one of which is directly sealed on the support member having perforations. Such an alternative is less preferred because the inherent permeability of a permeable film portion also aids gas exchange. More important, the intimate contact area between the film and the meat, a portion of waterproof perforated film will prevent reddening of the meat except in the specific areas of perforation, which will result in a non-reddened area that contains areas of flesh with one more color Red. And, because of the cost involved in the coextrusion of two gas barrier layers in a single layer film only when one was simply perforated for permeable stollen, it is generally preferred that the perforated portion be permeable. Figure 3 refers to a package 50 similar in operation but slightly different in its manufacture to the space 10 of figures 1 and 2, above. Again the package 50 includes a tray 52 having side walls 54 and a base, not shown, which defines a quality 58 for receiving a product. A peripheral rim 62 is defined around the upper portions of the side walls 64. A multilayer fabric 66 is sealed over the tray in the rim 62. For the current embodiment, the fabric 66 is a multilayer or laminated film. co-extruded from a non-perforated waterproof film 68 and from a film 70 including perforations 72. As in the case of the single-film modality * presented above it is preferred that the film 70 be a permeable film because, even when the perforations defined therein The film significantly increases the gas transmission rate of the film, the inherent permeability helps the exchange of gases and in areas of intimate contact between the film and the meat the meat will be prevented from turning red. However, a non-permeable film perforated to make it permeable is also within the scope of the present invention. As shown in FIG. 3, a non-perforated film 68 is peeled off to reveal a perforated film 70 for rapid gas exchange and packing of meat packaged at a retail location. Figure 4 illustrates 8 gaskets 100 in accordance with the present invention that includes a support member or trays 112 having side walls 114 and a base defining an internal cavity 118 for receiving a product. A peripheral rim 122 is defined around the upper portions of the side walls 114. A multi-ply fabric 126 is sealed over the tray at the rim 122. For the present embodiment, the woven 126 is a film laminate 128 and a film. multilayer 130 having perforations 132 defined therein. Again, a multilayer film 180 can be delayed in two separate portions of films. However, for purposes of the present embodiment, it is necessary that the force required to delaminate the film 130 in two separate portions of the film be less than the force required for the film. delaminate a waterproof film 1B of the upper surface of the multilayer film 130. That is, the film 130 is formed by coextrusion, is perforated and then laminated on an impermeable film 128. However, unlike the laminate 66 above, the waterproof film 128 can not be easily detached from the film 130. On the contrary, the bond strength is a film 128 and the multilayer film 130 is greater than the interlayer resistance of the film 130 such that any attempt to remove the film 128 results in failure of cohesion and delamination between film layer 130 in two separate film portions. Accordingly, the upper portion 136 remains attached to the impermeable film 12B and the lower portion 138 remains sealed on the tray rim 122. As in the case of the fabrics discussed in relation to the embodiments presented above, the permeability of the film 130 prior to its perforation is relatively optional and may encompass various combinations. More preferably, a multilayer film 130 is a permeable, permeable layer film that is perforated, laminated on an impermeable film 128, and when attempting to remove the film 128, it delaminates into two portions of film, one of which it remains attached to the film 128 and the other remains sealed on the tray 112 that encloses the product of ca ™ *, and of packaged meat. POG consequently, it should be understood that f, "Figure 4 illustrates the separation of the portions 136, ** -, and 1-e as shown but that the texture 130, being of caoas, Substantially, it can be separated into the interlayer layer interlayer, too. Without, however, S? It is delaminated in water. Permeable and waterproof Dorc ions, such as a multi-layered film perforated, laminated on a waterproof peiícu "ie? B, preferably with the impermeable portion found, being immediately adjacent to the * tir-tn = waterproof film 128 v K i-ß and the permeable portion is located on the s, on tray 112, and if an attempt is made to remove Del (r, film 128, delaminates in two portions of film, xicuia,? a portion.-Pr ~. bl. p.rM "lMto attached to., Wtal | ^ or n pa ^ b ,. peBMneciendo ^^ ^ ^ ^ ' »«. O -. * Ai HeCo,. p.l leu 130 est < ^ find also *, tro del -, "", _ .nv.nciop, a "n when *" "... less preteridjl. . 'ßriaa, laminate one P.ap.1. .30 * re. "P.llcula ¡mpß eablß i2s with pcr = l." Pecable .nc "trandosa ln? LM mm ^ the film 128 and mort-iAr, and * a waterproof portion sena H» lß senada on the - "UU," Ia ... ",,," __ tiM? ßn «- - ^ ^. ,, to P" UcüU of multiple layers that delaminates in two impermeable portions in such a way that the portion of film that remains sealed on the tray 112 upon removal of the film 128 is a perforated waterproof film which is apparently permeable due to the perforations. As mentioned above, it is preferred that the remaining film portion 138 exhibit permeability because, even though the perforations defined therethrough greatly increase the gas transmission rate of the film, said inherent permeability aids the exchange of gases and to the potential exclusion of redness in areas of intimate contact between the film and the meat. Turning now to other means for exchanging gases that can be defined within the first film of the present invention, Figure 5 illustrates a package 150 that includes a tray 152 having side walls 154 and a base 156 defining a cavity 158 for receiving a product 160. Coma will be observed with more details below, for the purposes of this modalityIt is preferred that a double flange 162 including an outer flange portion 164 and an inner flange portion 166 separated by a depression 168 is chosen. Co is best shown in the cross-sectional view of FIG. 6, a first film. 170 is sealed on an inner flange portion 166 and includes an enlarged opening 172 defined therein. The opening 172 has dimensions sufficient to provide a gas transmission rate of at least 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7 ° C, and more preferably at least 75.00 cc / m2 / 24 hours / atm, at a temperature of 22.7 ° C to the film. For the purposes of the present embodiment, it is preferred that the film 160 be formed of a gas permeable film, as will be shown below. A waterproof film 174 encloses a film 170 and an aperture 172 defined therein and is sealed on the outer flange portion 174. Preferably, the seal formed between the film 174 and the flange portion 164 e: <It is such that the film 174 can be easily peeled off when sold at retail. Accordingly, when the impermeable film 174 is removed, the enlarged opening 172 defined in the film 170 allows a rapid exchange of gases in and out of the package and a concurrent reddening of the packaged meat product. After said gas exchange, the opening 172 is closed with a patch 176 as shown in Figure 6A. Alternatively, the aperture 172 can be formed after the removal of the film 174 and then the patch 176 is applied. The patch can be either permeable or impermeable. Generally, it is preferred that either the film 170 or the patch 176 or both elements exhibit permeability to allow a continuous exchange of gases during presentation for retail sale. Also, a unique waterproof fabric having a patch covering the hole is within the scope of the invention. If the film 170 is impervious to gases, then the patch 176 preferably comprises a permeable material. However, since the aperture 172 and its patch 176 have only a relatively small percentage of the surface area of the film 170, a preferred option is for the film 170 to be permeable. Then patch 176 may be either permeable or waterproof but does not require serving as a gas exchange medium only during presentation for retail sale. In addition, instead of giving the appearance that something went wrong and that the package was "patched up" for presentation for retail sale, it is preferred that the package serve as an entire label or part of a label that identifies the product. Even when a single enlarged opening is illustrated, two or more small openings may also be employed insofar as they offer a sufficient capacity of gas flow to the film. However, it is generally preferred that multiple openings be grouped together such that they can be closed by means of a single patch or label.

Figure 7 illustrates another embodiment of the present invention wherein a package 200 includes a tray 212 with side walls 214 and a base 216 defining a cavity 218 for receiving a product 220. For purposes of the present embodiment, it is preferred that a flange double 222 is employed which includes a portion 224 of outer flange, a portion 226 of internal flange and a depression 228 separating the two portions. As best shown in the cross-sectional view of FIG. 8, a first film 230 encloses the product and is sealed on the tray 212 in the inner flange portion 226. An enlarged aperture 232 is defined within the first film and a second film or part 234 is sealed over the first film by enclosing the aperture 232. For all embodiments of a permeable patch or of a film covering a hole in a first The film, permeable patch / film material may comprise any permeable polymeric material compatible with the fabric on which it is sealed. It may comprise, for example, polyethylene or any type of ethylene cspolymers including, for example, ethylene vipylacetate, ethylene glycol copolymer, ethylene acrylate copolymers including neutralized salts of metals thereof, and alpha-ethylene copolymer. olefin A patch / film having a gas transmission rate of at least about 50,000 cc / m2 / 24 hours / atm is preferred. at a temperature of 22.7 * E, more preferably a data transmission rate of at least approximately 75,000 cc / m2 / 24 hours / atm. at a temperature of 22 ° C. Examples of such patches or films include polyester or polyolefin materials spun-bonded or, for example, Tyvefc, manufactured by DuPont and other proprietary materials well known in the art. A waterproof film 236 encloses the first film 230 and the patch 234 and is sealed over the outer rim portion 224 of the tray 212. Preferably, the seal between the waterproof film 236 and the outer recess portion 234 is such that the film 236 can be detached from the packaging leaving the first film 230 and the patch 234 a ^ ß enclose the product. The extremely high gas transmission capacity of patch 234 provides rapid gas exchange and reddening of packaged meat. Although it is preferred that the pellet 230 be permeable, an impermeable film can be spread to the extent that the enlarged aperture and the highly permeable patch are sufficiently garnet to allow a free flow of gases into and out of the packaging. Accordingly, the gasket 200 is formed by sealing a priandrole 230 on an inner flange portion 226 of the tray 212 containing the product 220. An enlarged opening is formed and covered with the second highly permeable film or patch 234. . A waterproof sheet 236 is then sealed onto the outer flange portion 224. Similarly, the enlarged opening 232 may be formed prior to the application and sealing of the film 230 on the tray. If such is the case, the second film or patch 234 may also be sealed on the first film 230 prior to application and sealed on the tray 212. A package of the present invention that is similar in operation but different in appearance and manufacture. is illustrated in Figure 9. The gasket 250 includes a tray 252 having side walls 254 and a base 256 defining a cavity 258 for receiving a product 260. A double flange 232 includes an outer flange portion 234 and a portion 266 of inner flange separated by a depression 268. A first film 270 is sealed on an external flange portion 266. A film 272, preferably a continuous band, is sealed on a first film 270. Co or in the case of the patch / film presented above., the second film 272 of the present embodiment preferably comprises a permeable material as described above, for example Tyve. A waterproof film 274 encloses the first film and the second film and is sealed on the tray 252 in an outer flange portion 264. A waterproof film 274 can be peeled off to expose the first film and the second film. The highly permeable nature of the second film 272 provides a rapid exchange of gases in and out of the package and an immediate reddening of the packaged meat product. Preferably, a series of perforations or slits 275 are inserted in the film 270 under the film 272, preferably after the film 272 is sealed thereon to increase the free flow of gases in and out of the package. Instead of being applied in the form of a patch, the second film 272 of the present embodiment is preferably sealed on the first film before application and sealing of the first film on the tray. For all embodiments of the present invention it should generally be noted that double-flange trays are preferred when two separate fabrics must be sealed on a single tray. However, a conventional tray with a single flange can be used when a precise device is provided for sealing the first film on an inner portion of the single flange and for subsequently sealing the impermeable film on an external portion of the single flange. That is, the essential reason why 3 prefers a double recall for use with the tray of the present invention this facilitates the automated sealing of two separate fabrics on the flange. A second circumstance under which a single flange can be employed as a tray for double weaving modes of the package of the present invention is when a removable, suitable seal can be made between the impermeable film and the first film. Instead of sealing the waterproof film directly on the tray, it is possible, with an adequate selection of film components, to form a seal directly on the first film which can be peeled off without accepting the seal between the first film and the tray flange. The permeable or woven film of the present invention is an oxygen permeable film which can be a formable or spirable material. Typical polymeric materials for the present permeable film may include any material that can be sealed and fixedly attached to the support member such as eg polyele or any of several ethylene copolymers including, for example, vinyl acetate, copolymers of Acrylate ethylene, copolymers of acrylic acid ions, including neutralized metal salts thereof, and copolymers of alpha-olefin ethylene. Such copolymers of ethylene alpha-olefins may be heterogeneous or harmless, for example. et "" • »« '• »•» < • »•» ".i *?« *. po, e.MI l. conventional Zei9, er-Natta and are "etsro9e" eos by "tm¡m C "° P ° r eJß-" ° P- "» il «?. de b ja linear density (LLDPE), M find inside the alean, -, d. , - to the present invention as well as polymers formed by "Wli.?. "...? -gave"? > s? s of single site, co "or by .jMplß eu.llHqul.pl of ^^ ^^ ^ catalyst technology of metal.oeno, and are homooéneos pair natural are tapian inside the., "" _. gives the present invention. A. Darmeable film ^^ ^ its use in accordance with the invention is a symmetric oriented film of five aa? «? p s" -ap s that has the structure: EVA / LLDPE / EVA / LLDPE / EVA even when a wide variety of permeable films can be used. L movie 1 ^. ,, 0 blen t.jldo ^ ^ ^^ .nv.nciin could be any movie d. barrier, "P. or else the "tin" i. I'm sorry, "Pe ™ ..ble. the ß .. "CMO for« «pu, or lwno. ,.,.,. "., What a fresh product ^ ^ contained *, in vacuum or another" atiera ". .n =, í9.no ten ,, ün, vid. " ^^ ^^^ ^ comparison with a package without Hi h. P that without said barrier layer.

Suitable polymeric materials which have gas barrier properties for use in the present invention include copolymers of ethyl alcohol, copolymers of vipilidene chloride (PVDC) such as vinylidene chloride, for example. of vinyl or vinylidene chloride acrylate of methyl. Laminates of a sealable film 5 and a barrier structure including a barrier layer and a non-malfeasible, resistant material, such as a biaxially oriented nylon or a biaxially oriented polyester are especially preferred for use as an impermeable layer of the gaskets of the present invention. A preferred waterproof fabric has the following structure: biaxial nylon / PVDC // EVA / LLDPE / seal Where the double diagonals < //) indicate adhesive lamination of the two fabrics, although several laminates and multilayer films 15 may be employed as the waterproof fabric of the present invention. Generally, films or fabrics, which may be used in accordance with the present invention, may be single-layer or multi-layer. The multi-layer films 20 can be used when all the required properties of the film can be achieved by a single polymer component or a mixture of polymers in a single layer. For example, a film impervious to sealing on a tray will, with all likelihood, comprise a multilayer film because it requires several properties including detachment, seal capacity, oxygen barrier and impact resistance, and properties. of protection against external abuse. Therefore, it is likely that the film used has at least 3 layers: a seal layer, a barrier layer and an outer layer of protection against abuse. Other internal layers such as for example adhesive layers and base layers may also be included. Laminates of sealable films and non-mouldable materials such as for example biased oriented biaxy plysses or biaxially oriented nylon are also within the scope of the present invention and are widely recognized as top caps for tray-type packaging. For all modalities, the tray must be waterproof, but it can be chosen from various designs and commercially available compositions. That is, the tray can be formed of a rigid solid polymer, a polymer coated with barrier sealant, a foam polymer coated with a barrier sill, or a cardboard or pulp tray coated with a barrier sealer. If a foam is formed, a barrier film should be included, at least on the inner surface of the tray to prevent the escape of residual gases into the packaging. Usually, the films used in the present invention may be multi-layered or ono-layered, although obviously these films defined as delaminable, multi-layered films must include at least two layers. Typically, the films used will have 2 or more layers in order to incorporate various properties, such as seal capacity, gas impermeability and strength, into a single film. The above description of preferred embodiments of the invention was presented for the purpose of illustrating and describing said invention. It is not intended to be complete or to limit the invention to the precise embodiments presented and modifications and variations are possible based on the above teachings or may be acquired from the practice of the invention. The modalities were chosen and described for the purpose of explaining the principles of the invention and their practical application in order to enable an expert in the field to use the invention in various modalities and with several modifications suitable for the particular use contemplated. The scope of the present invention will be defined by the appended claims and their equivalents.

Claims (3)

1. CLAIMS 1. A packaging for a product, comprising: a product; a waterproof support member that supports the product; a first, film secuted on the support member to enclose the product a device defined within the first movie to exchange «aces inwards > This device for exchanging aces has a speed of approximately 50,000 cc / m2 / 24 hours / atm. at 22.7'C; v a second impermeable film that encloses the first film and the rt¡en ".f t. The device defined therein for exchanging gases, in such a way that the removal of said second impermeable film provides the exchange of gases in and out of the package.
2. 2. A package for a product, comprising: a product: a »i« bro d. support i ^ per ^ able ou. Supports the p sductof a tissue d. multiple layers selíado on., »lMbno d. support pair. enclose the product, said fabric d. ch., «... api - can be ignored in a. porcia p.rm ...! and a. The said portion is then viewed directly adjacent to and sealed on said support member so that said permeable portion remains sealed on said support member to render said impermeable portion, and because the delamination of said impermeable portion from said permeable portion defines at least one channel within said permeable portion that allows the free flow of gases through said at least one channel into and out of said packing. 3. The package defined in claim 2, wherein said multilayer fabric is a multi-layer, co-extruded film. 4. The package according to claim 3, wherein said multilayer film comprises perforations. Partially through said perforations extend through or substantially through said permeable portion of the film, said impermeable portion being substantially ßKenta of said perforations. The package according to claim 2, wherein said multilayer fabric is a laminate comprising a non-perforated isperable film which is the impermeable portion and a perforated film which is the permeable portion. 6. The package according to claim 5, wherein said perforated film comprises a permeable polymeric material. 7. The package according to claim 6, wherein said permeable film is a film of single, multilayer layers that can be de- laminated into two separate portions of film. The package according to claim 7, wherein the force required to delaminate the perforated permeable film into two separate portions of film is less than the force required to detach the impermeable non-perforated film from the perforated permeable film such that the Removal of the non-perforated impermeable film from the perforated permeable film causes the perforated permeable film to disperse into two separate portions of film, one of said portions of film remains sealed on the support member, the other of said portions of film remains laminated on the non perforated waterproof film. The package according to claim 5, wherein said perforated film becomes permeable by means of said perforations. 10. The package according to claim 9, wherein said perforated film is a multilayer film that can be delaminated into two separate portions of films. 11. The gasket according to claim 10, wherein the force required to defoliate the perforated film into two separate portions of film is less than the force required to debond the non-perforated impermeable film of the perforated film in such a way that the removal of the non-perforated waterproof film of the perforated film causes the perforated film to be defaced into two separate portions of film, one of said portions of film remains sealed on the support member, the other of said portions of film remains laminated on the impermeable non-perforated film. 12. The packaging according to the rei indication 8, wherein said perforated film is a perforated coextruded multiple layer film. 1.
3. 3. The packing according to the rei indication 12, wherein the perforated film further comprises a waterproof portion laminated on the impermeable non-perforated film and where the force required to desiaminate the impervious portion of the perforated film from the permeable portion thereof. less than the force required to delaminate the non-perforated waterproof film of the impermeable portion of the perforated film such that the removal of the imperforate impermeable film from the perforated film causes the perforated film to be defaced into two separate film portions, The permeable portion of the perforated film remains sealed on the support member, the impermeable portion remains laminated on the impermeable non-perforated film. 14. A packaging for a product, comprising: a product; a support member that supports the product; a first film sealed on the support member for enclosing the product; a second impermeable film to enclose the first film; at least one channel defined within the first film and enclosed by the second impermeable film whereby the removal of said second impermeable film allows a free flow of gases through said at least one channel, in and out of said package; and a patch for enclosing said channel after said gases flowing in and out of said package have reached a desired balance. 15. The package according to claim 14, wherein said first film is permeable. 16. The package according to claim 14, wherein said patch is permeable to gases. The package according to claim 14, wherein said channel defined within said first film is of sufficient size to allow a gas transmission rate of greater than about 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7ßC. 18. The package according to claim 17 wherein said channel defined within said first film is of sufficient size to allow a gas transmission rate of at least about 75,000 cc / m2 / 24 hours / atm. at a temperature of 22.7 ° C. 19. A package for a product, comprising: a support member supporting the product: a first film sealed on the support member; a second film sealed on the first film said second film has a gas transmission rate of at least about 50,000 cc / m2 / 24 hours / atm. at a temperature of 22.7 ° C, said product is enclosed within said support member by said first film and said second film; a third waterproof film to enclose the first film and the second film; whereby the removal of the third impermeable film allows a free flow of gases through said second film in and out of the package. 20. A package according to claim 19, wherein said second film is sealed on said first film by means of an adhesive. 21. A package according to the indication 19, wherein said second film is sealed on said support member. 22. A package according to claim 19, wherein said first film is permeable.