The high-temperature retort bag is a composite plastic film bag that can be heat-treated. It has the advantages of both a can container and a boiling water-resistant plastic bag. The food can be kept intact in the bag, after high temperature (usually in120~135โ) Sterilize and heat, take out and eat. Proven in use for over a decade, it is an ideal sales packaging container. It is suitable for the packaging of meat, bean products, and seafood ready-to-eat products. It is convenient, hygienic and practical, and can well maintain the original flavor of the food, which is favored by consumers.From the perspective of the market, because of the opacity of aluminum foil composite film packaging, consumers cannot see the color and shape of the contents, which is not conducive to consumers’ purchase. In addition, some manufacturers use the opacity of aluminum-plastic composite film to cover up product defects, and even resort to fraud. , entrap consumers. Therefore, most consumers choose completely transparent packaging instead of opaque aluminum-plastic composite film packaging, resulting in poor sales of food in this packaging. Aluminum-plastic composite packaging cannot be heated by microwaves, and is more expensive than plastic films, all of which affect the application of aluminum-plastic composite films. Therefore, the food processing industry has always hoped that the packaging material process can provide a packaging material that has a barrier property similar to that of the aluminum-plastic composite film, but is fully transparent, and can withstand high-temperature cooking to replace the aluminum-plastic composite film.In order to meet the performance requirements of the retort pouch, the outer layer of the structure is made of high-strength polyester film, the middle layer is made of light-shielding and air-tight aluminum foil, and the inner layer is made of polypropylene film. The three-tier structure is:PET/AL/CPP,PPET/PA/CPPTwo, four-layer structure hasPET/AL/PA/CPP.
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