The primary use range of ziplock bags is the food field, which is used for foods that need to be stored in a vacuum environment. Used to extract air from plastic bags, and then add nitrogen or other gases that are harmless to food.
The primary role of ziplock bags:
1. Prevent the growth of microorganisms in a vacuum environment, avoid the pollution of the surrounding environment, reduce the oxidation rate of fat in multiple meat foods, and inhibit the growth environment of enzyme microorganisms.
2. The self-sealing bag can prevent the moisture of the food itself from transpiration, reduce water loss, and maintain product quality.
3. The beauty of the ziplock bag itself is easy to make people intuitively feel the product and increase the desire to buy.
Self-sealing bags are made of polyvinylidene chloride, polyester, and polyamide materials that have good oxygen permeability and shrinkage resistance. Some nylon, polyester film, and polyethylene multilayer materials are also used for compounding. The polyvinylidene chloride raw material mentioned above is the film type with the best oxygen and water vapor barrier effect, but it is not heat resistant. Polyester has great 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 raw materials to choose the advantages and disadvantages of various films.