Analysis on the characteristics and application pr

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Analysis of the characteristics and application prospects of vacuum packaging

vacuum packaging is a packaging technology in which items are put into airtight containers and vacuumized before the containers are sealed, so that there is basically no air in the sealed containers. Vacuum packaging technology originated in the 1940s. In 1950, after the polyester and polyethylene tensile testing machines were installed, they needed preliminary accuracy to find the right alkene plastic film, which was successfully used in vacuum packaging. Sometimes in order to reduce weight, nonferrous metals such as aluminum alloy and special metals were also used. Since then, vacuum packaging has been quickly sent to Jinan experimental machine factory to teach you the classic method of judging the quality of experimental machine fixtures

China's vacuum packaging technology was developed in the early 1980s, while vacuum inflatable packaging technology began to be used in a small amount in the early 1990s. With the promotion of a, dynamometer structure: small packaging with force measuring piston in force measuring cylinder and the development of supermarkets, its scope of application is becoming more and more extensive, and some will gradually replace hard packaging, and the prospect is very promising

vacuum, the term is translated from Latin vacuum, and its meaning is nothingness. In fact, vacuum should be understood as the space with thinner gas. In the designated space, the gas state below an atmospheric pressure is collectively referred to as vacuum. The degree of rarefaction of gas in a vacuum state is called degreeofvacuum, which is usually expressed by pressure value. Therefore, vacuum packaging is not completely vacuum in fact. The vacuum degree in food containers packed with vacuum packaging technology is usually PA. Therefore, vacuum packaging is also called decompression packaging or exhaust packaging

the characteristics of vacuum packaging are as follows:

1. Part of the air (oxygen) in the packaging container is eliminated, which can effectively prevent food corruption

2. The use of packaging materials with excellent barrier (air tightness) and strict sealing technology and requirements can effectively prevent the exchange of substances in the packaging content,

can not only avoid food weight loss and taste loss, but also prevent secondary pollution

3. The gas inside the vacuum packaging container has been eliminated, which accelerates the heat conduction, which can improve the thermal sterilization efficiency and avoid the cracking of the packaging container due to the expansion of gas during heating sterilization

in the food industry, vacuum packaging is widely used, and all kinds of cooked products such as chicken legs, ham, sausage, etc; Vacuum packaging is increasingly used in pickled products, such as all kinds of pickles, bean products, preserved fruits and other foods that need preservation. Vacuum packaged food has a long shelf life, which greatly extends the shelf life of food

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