Special requirements for inner layer CPP of high temperature cooking bag?
CPP, as a kind of high temperature resistant cooking material, should not be made from homopolypropylene, but should be made from copolypropylene or polypropylene particles modified by blending. This is required by the technological conditions of high temperature cooking. Because CPP made of homopolypropylene is brittle after high temperature cooking, it is difficult to pass the drop test, which is easy to break at the seal and cause leakage of contents. The so-called copolypropylene is a copolymer containing about 5% ethylene or long chain alkene monomer, such as butene, octene and about 95% propylene. The so-called blending modified polypropylene is made by blending ethylene propylene resin, polyisobutylene or rubber materials with homopolypropylene in a certain proportion. The CPP film made of copolypropylene or blending modified polypropylene has softer handle, worse transparency than that of homopolypropylene, and has higher elongation. When it is stretched after normal or high temperature cooking, it shows strong toughness, metallic luster, high sealing strength, good pressure resistance and drop resistance.
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