The retort pouches are mostly made of a composite of three layers of materials. The typical cooking pouch structure is: the outer layer is a polyester film for reinforcement; the middle layer is aluminum foil, used for light protection, moisture proof, and leak proof; the inner layer is polyolefin. Films (eg polypropylene films) for heat sealing and food contact.
In food packaging, retort pouches have many unique advantages over canned metal containers and frozen food bags:
1 Maintain the color, smell, taste and shape of food. The cooking bag is thin and can meet the sterilization requirements in a short period of time. The original color, smell, taste and shape of the food are preserved as much as possible.
2 easy to use. Cooking bags can be opened easily and safely. When eating, put food into bags and put it in boiling water for 5 minutes to turn on the food, even without heating.
3 convenient storage and transportation. The cooking bag is light in weight and can be stacked and stored. It occupies a small space. After packaging food, it occupies less space than metal cans. It can make full use of storage space and save storage and transportation costs.
4 Save energy. Since the cooking bag is relatively thin, the bag can rapidly reach the bacterial lethal temperature when heated, and the consumed energy is 30 to 40% less than that of the iron can.
5 is easy to sell. Cooking bags can be packaged or packed with different foods according to market needs. Customers can purchase them freely. In addition, due to the fine decoration, the sales volume is greatly increased.
6 save a long time. The food packaged in cooking bags does not need to be refrigerated or frozen, has a stable shelf life, can be comparable to metal cans, is easy to sell, and is also convenient for home use.
7 Lower manufacturing costs. The composite film used to make retort pouches is less expensive than metal plates, and its production process and equipment required are simple. Therefore, cooking bags are cheap.