The composition and characteristics of soft canned food packaging "retort bag"
The research of soft canned food is headed by the United States, starting in 1940. In 1956, Nelson and Seinberg of Illinois were tried to experiment with several films including polyester film. Since 1958, the US Army Natick Institute and the SWIFT Institute have begun to study a soft canned food for the military to use, in order to use the steamed bag instead of the tinplate canned food in the battlefield, a large number of trial and performance tests. The soft canned food made by the Natick Institute in 1969 was trusted and successfully applied to the Apollo Aerospace Program.
In 1968, the Japanese Otsuka Food Industry Co., Ltd. uses a transparent high-temperature retort bag packaging curry product, and it has achieved commercialization in Japan. In 1969, the aluminum foil was changed as a raw material to increase the quality of the bag, so that the market sales continued to expand; in 1970, it began to produce rice products packaged with retort bags; in 1972, the retort bag was developed, and commercialization, commodity, The retort bagged meatballs also put into the market.
The aluminum foil type retort pouch was first made of three layers of heat-resistant materials, called "retort pouch" (RP for short), a retort pouch sold by Japan's Toyo Can Company, containing aluminum foil called RP-F (resistant to 135 ° C), transparent multi-layer composite bags without aluminum foil are called RP-T, RR-N (resistant to 120 ° C). European and American countries call this bag a flexible can (Flexible Can or Soft Can).
Retort pouch features
1. It can be completely sterilized, microorganisms will not invade, and the shelf life is long. The transparent bag has a shelf life of more than one year, and the aluminum foil type retort bag has a shelf life of more than two years.
2. Oxygen permeability and moisture permeability are close to zero, making it almost impossible for the contents to undergo chemical changes, and can maintain the quality of the contents for a long time.
3. The production technology and equipment of canned food in metal cans and glass bottles can be used.
4. The sealing is reliable and easy.
5. The bag can be heat-sealed and can be punched with V-shaped and U-shaped notches, which are easy to tear and eat by hand.
6. The printing decoration is beautiful.
7. It can be eaten after heating within 3 minutes.
8. It can be stored at room temperature and can be eaten on any occasion.
9. It is suitable for packaging thin food, such as fish fillet, meat fillet, etc.
10. Waste is easy to handle.
11. The size of the bag can be selected in a wide range, especially the small size packaging bag, which is more convenient than canned food.
