• Categories:Industry Trends
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• Time of issue:2019-04-05 12:32
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(Summary description)Ordinary sterilization bags are generally heat-sterilized below 120 ° C, mostly made of two to three layers of composite materials. The shelf life of food is more than half a year. Ultra-high temperature sterilization bags are generally sterilized at 135 ° C. The bag-making materials are more than three layers, with aluminum foil sandwiched between them, and the shelf life is 1-2 years. Some are also produced using four or five layers of composite materials. The outer layer of the retort pouch is made of polyester film with a thickness of 10-16 microns, which is used for reinforcement and high temperature resistance. The middle layer material is 11-12 micron aluminum foil, the main function is to block gas and moisture and shield light; the inner layer material is As a direct contact with food and heat sealing in the retort pouch, in addition to the packaging hygiene standards, the requirements for the inner layer material are also required to be chemically stable. Generally, non-toxic polypropylene is used, and the thickness is 70-80 micrometers. A polyolefin film such as HDPE. At present, retort pouches are mainly used for packaging canned foods, and are also used in Japan and Western Europe for packaging beverages, juices and the like. With the improvement of people's living standards in China, the safety requirements for food packaging are getting higher and higher, and the retort pouch food packaging will usher in a period of rapid development.