Security analysis of plastic packaging materials

Plastic is a kind of polymer resin as basic ingredient, then add some used to improve the performance of polymer materials of various kinds of additives. Now almost all the food, no matter how many, are packaged in plastic. As a rising star of packaging materials, plastic packing materials because of its rich raw materials, the characteristics of low cost, good performance, light weight and beautiful, to become nearly forty years, the world's fastest growing packaging materials. The security of the plastic packaging materials mainly for materials internal residual migration of toxic and harmful substances, dissolution and cause food contamination, its main source has the following several aspects: 1. 1 resin itself has a certain toxicity; Not polymerization of free monomer in resin, cracking, Vinyl chloride, styrene, phenol formaldehyde), nitrile rubber, , degradation and aging of toxic substances on food safety were affected. The us food and drug administration said, not PVC ( PVC) Itself but remaining in PVC vinyl chloride ( VCM) After oral intake may cause cancer, and therefore PVC products as a food packaging materials is prohibited. Polyvinyl chloride (PVC) free monomer vinyl chloride ( VCM) Have anesthesia effect, can cause human body limb vascular contraction and pain, have carcinogenic, teratogenic effects at the same time, it formed in the liver oxidation of vinyl chloride, have strong alkylation effect, but combined with DNA to produce tumors [ 1] 。 Polystyrene residual material in styrene, ethyl benzene, toluene and isopropyl benzene on food safety hazards. Styrene can inhibit rat fertility, make liver, kidney weight. Low molecular weight polyethylene LaWei dissolve in oils and fats, affect the quality of the product. Make polycarbonate resin raw materials for the bottle produce phenol, have certain toxicity, produce peculiar smell. These harmful material effect on the food safety depends on the concentration of these substances in the material, the combination of tightness, and the nature of the material in contact with food, time, temperature, and in the solubility of food [ 2] 。