With the development of plastics and its superior properties, the application fields of plastic packaging materials are more and more extensive. As a very important member of the packaging material family, plastic film has attracted more and more attention in the food packaging industry.

In recent years, with the continuous development of multi-layer coextrusion technology, multi-layer coextrusion composite film is widely used in the fields of food, meat, seafood, grain and chemical products because of its excellent barrier, chemical resistance, high and low temperature resistance and mechanical properties. Multi layer coextrusion heat shrinkable casing has its unique processing technology and excellent packaging effect, A large number of are applied to the packaging of low-temperature enema products requiring pasteurization.

As the packaging of low-temperature enema products, multi-layer coextrusion shrink casing plays a very important role in the production, sales, circulation and storage of irrigation products.

(1) It must be protected from microbial, chemical and physical pollution.

(2) Maintain the required physical state of the sausage.

(3) It can tell the buyer what ingredients are contained in the sausage.

(4) It is an advertising medium for products, persuading customers to buy your products rather than competitors' products.

In view of the above functions, high-quality casings should meet the following requirements for sausages:

(1) Good oxygen, water vapor and fragrance barrier;

(2) Good physical and mechanical properties to meet the requirements of enema technology;

(3) Good meat viscosity prevents water and gravy from overflowing from meat;

(4) Safe and reliable food hygiene;

(5) The cooking resistance meets the requirements of sausag