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The main application range of ziplock bags is in the food field, which is used for foods that need to be stored in a vacuum environment. It is used to extract air from plastic bags, and then add nitrogen or other mixed gas that is harmless to food.
The main role of the ziplock bag:
1. Prevent the growth environment of microorganisms in a vacuum environment, avoid pollution of the surrounding environment, reduce the oxidation rate of fat in a plurality of meat foods, and inhibit the growth environment of the enzyme microorganisms present.
2. The self-sealing bag can not cause the water of the food itself to evaporate, reduce water loss and maintain product quality.
3, the self-sealing bag itself is beautiful, easy to create an intuitive feeling of the product, increase the desire to buy.
The self-sealing bag is made of polyvinylidene chloride, polyester or polyamide which is anti-oxidation, which prevents oxygen permeability and shrinkage. It is also partially compounded with nylon, polyester film and polyethylene. The polyvinylidene chloride material mentioned above is the best film type for oxygen barrier and water vapor barrier, but it is not heat resistant. Polyester has a large tensile strength. Nylon has good oxygen barrier properties and good heat resistance, but the water vapor transmission rate is too large and the manufacturing cost is large. Therefore, in general, most manufacturers will choose composite materials to select the advantages and disadvantages of various films.
