Why do plastic heat shrinkage

Plastic bags why heat shrinkage release date: 2018 - 12 - 17 common plastic is PVC, polyethylene, polypropylene and other materials, plastic bags had long molecular chains of fracture by oxidation, will knit together, plastic bags will shrink. Plastic bag is made by blow molding processing technology, cooling stereotypes when under the effect of blowing up the stress in the molecular chain of directional tensile state forced freezing, freeze break from stress to heat up the molecular chain solution free activity, return to natural curly. Above is the reason why plastic heat shrinkage. A: how can you get it ready food packaging next article: giant to teach you how to identify food packaging bags
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