Cooking bag will become the mainstream of food packaging

With the increasing quality of life of people, the requirements for the safety of food packaging are getting higher and higher. Experts believe that cooking food packaging will usher in a period of rapid development.

Currently, cooking bags are mainly used to package canned foods, and are also used in Japan and Western Europe for packaging beverages, juices, and the like. Cooking bag is a kind of composite film food packaging bag that can be sterilized at high temperature. According to sterilization temperature and shelf life, cooking bag is divided into ordinary sterilizing bag and ultra-high temperature sterilizing bag. Normal retort bag is generally heated below 120°C. Sterilization is mostly made of 2 to 3 layers of composite materials. The shelf life of food is more than six months. Ultra-high temperature sterilization bags are generally sterilized at 135°C, and the bag-making materials are mostly over 3 layers with aluminum foil sandwiched between them. The shelf life is 1 to 2 years, and some also use 4 to 5 layers of composite materials. The retort pouch outer layer material mostly uses the polyester film, the thickness is 10~16 micron, plays the reinforcement and the high temperature effect; The middle layer material is the aluminum foil of 11~12 micron, the main function is isolates the gas and the water and shields the light; The inner layer material is As a direct contact with food and heat sealing in the cooking bag, the requirements for the inner layer material must not only meet the hygienic standard for packaging, but also require chemical stability. Non-toxic polypropylene is generally used, and the thickness is 70-80 μm. Using polyolefin films such as HDPE.