Home Food Production Machines Why does the heat shrinkable film shrink greatly when heated? Can all stretched plastic films be used as heat shrinkable films? Why?

Why does the heat shrinkable film shrink greatly when heated? Can all stretched plastic films be used as heat shrinkable films? Why?

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if you want to know more, Baidu’s PP forum contains a lot of information about PE, pet, CPP, BOPP, PVC, PA and PS films

when the heat shrinkable film is heated, the irregular arrangement of the original molecules has changed. Under the thermal radiation such as infrared, the plastic molecules are rearranged closely, which greatly reduces the original area
commonly used shrinkage materials include PVC, POF, PE, etc. At present, POF shrinkable film is the most widely used. It is recognized by the majority of manufacturers for its high surface gloss, good toughness, high tear strength, uniform heat shrinkage, suitable for full-automatic high-speed packaging, especially environmental protection. It can also be called environmental protection shrinkable film, so it has a very wide range of applications; PVC shrink film: the chemical name is polyethylene. It is a toxic material, which is not environmental friendly and has low toughness. It is gradually replaced by POF. It is generally suitable for chemical and non environmental protection industries; PE shrink film: it is generally the most widely used in the beverage industry. Characteristics: good flexibility, impact resistance, strong tear resistance, not easy to damage, not afraid of moisture and large shrinkage. It is suitable for shrink film packaging with heavy products. It is suitable for large quantities of automatic shrink packaging items such as cans, glass bottles, beer, mineral water and so on.

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