What material is the food packaging bag

Many people don't know what material food packaging bags are generally made of. Now the packaging will briefly explain the materials of food packaging bags. The main materials of food packaging are: PVDC (polyvinylidene chloride), PE (polyethylene), PP (polypropylene), PA (nylon), EVOH (ethylene/vinyl alcohol copolymer), aluminized film (aluminum + PE) ) and several other major membranes. The production of film can be divided into: stretch film, blown film. At present, the main materials used for food packaging are PP and PE, that is, polypropylene and polyethylene plastics. For these two materials, both can satisfy food packaging, and there are no reports of problems in the world. Compared with non-food packaging, PP and PE do not contain plastic additives. We all know that plastic additives have a huge impact on the human body, especially children's health. PP and PE will not release toxic materials during use. Some Other materials will cause cancer, but PP and PE will not. In the packaging of PVC, it was used for plastic wrap before, but because of its insecurity, it is gradually replaced by PE plastic wrap. The characteristics of PE are: softness, poor mechanical properties than PP, and the representative products include general supermarket shopping bags, plastic wrap, garbage bags, etc. PP is hard, anisotropic (it is easy to tear if there is a gap), good mechanical properties, and high temperature performance is better than PE, which means that the product has bread bags. Generally, according to the material structure, the inner layer is PE or CPP, the outer layer is PA, PET, and the middle may be EVOH, or PVDC, etc. Some use aluminized film or aluminum foil. PE and CPP have good heat sealing properties, that is, they are easy to seal. PA and PET have good printability and can be used in the outer layer to print beautiful pictures. PVDC and EVOH have good barrier properties and prevent oxidation. Aluminized film and aluminum foil have good light-shielding properties and are suitable for products that are not suitable for visible light. Various materials have different properties and different uses. The general food packaging bag is not a single material, it is generally multi-layer composite, which can be composited with two layers, three layers, four layers and other dry goods and can be frozen. Generally, PET/PE is used. For example, high-temperature cooking is generally made of nylon composite CPP, or other composites. The red casing of the ham is a single material PVDC. Candy and chocolate generally use transparent paper/PP, kraft paper/PE/AL/PE, AL/PE, etc.
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