What materials are used in food packaging bags

Generally speaking, the main material of our special food bag is polyethylene, referred to as PE, which is a polymer organic compound made of ethylene. Polyethylene is recognized as the best food contact material in the world, non-toxic, tasteless, odorless, in line with the food packaging health standards.

Ordinary plastic bags contain polyvinyl chloride, this material is generally used in plastic materials such as plates, toys, stationery, if it is used to pack food, especially after heating, it is easy to produce two, um and other harmful substances, causing liver, kidney and central nervous system, blood system diseases. That is to say, we later pack food, it is best to use regular food bags. Now used in food packaging is the most important PP and PE, is polypropylene and polyethylene plastic.

Compared with the safety performance of these two can meet the food packaging, for now, there is no PP,PE product problems in the world related reports. Polycarbonate has been the subject of intense debate over the reproductive development of children and the use of BPA in food packaging plastics has been banned in some countries. About PP,PE safety can refer to the national standard SNT 2279-2009 food contact materials - plastic food analog in the determination of polycyclic aromatic scripture:

Compared with non-food packaging,PP and PE do not contain plastic additives, in the process of use will not release toxic substances, such as the front of the relatively fierce plasticizer can cause cancer, used in PVC packaging. The plastic wrap used to be PVC, but because of its unsafe, it is now being gradually replaced by PE plastic wrap. PE is soft and has poor mechanical properties compared with PP, which represents the general supermarket shopping bags, plastic wrap, garbage bags and so on. PP is hard, anisotropic (there is a gap is easy to tear), good mechanical properties, high temperature performance is better than PE, on behalf of bread bags. According to the material structure, the inner layer is PE or CPP, the outer layer is PA,PET, the middle may be EVOH, or PVDC, etc., and some are used with aluminum plating film or aluminum foil.

Reason :PE and CPP heat sealing better, is easy to seal. PA and PET have good printing ability, and can print beautiful pictures when used in the outer layer. PVDC and EVOH have good barrier properties to prevent oxidation. Aluminized film, aluminum foil good shading, for not easy to see the light of the product is appropriate. All kinds of materials have different properties and different uses. General food packaging bag is not a single material, generally multilayer composite. Dry frozen goods, usually PET/PE. For high temperature cooking, you use nylon composite CPP, or some other composite. The red casings of ham sausage are a single material PVDC. Candies and chocolates generally use transparent paper /PP, kraft paper /PE/AI/PE, AI/PE, etc.