Heat shrinkable film
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Heat shrinkable film
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Heat shrink film is used for the sales and transportation of various products, and its main function is to stabilize, cover, and protect the products. The shrink film must have high puncture resistance, good shrinkage, and a certain degree of shrinkage stress. During the shrinkage process, the film cannot produce pores. Due to the frequent use of shrink wrap outdoors, UV anti UV agents need to be added.
PE polyethylene is a transparent thermoplastic. There are three commonly used types of PE, namely LDPE, HDPE, and LLDPE. The monomers of these three types of polyethylene are the same, but the process conditions used to synthesize them are different. Therefore, three different types of polyethylene are produced, and the properties of the three materials are significantly different
PE film is a material with good toughness and is not easily crushed by ordinary plastic crushers. Due to the softness and toughness of PE film, it is not easy to chop, let alone the high temperature of the cutting tool at high speeds, which can cause LDPE to melt and adhere to the blade. The granulation of PE can be directly put into strips into the feeding port of the extruder, and the PE film is dragged into the barrel by the shear force of the screw for heating, melting, and extrusion granulation. The first grade material recycled from PE can still be blown film, used for non food and pharmaceutical packaging, and widely used in the production of Oxford leather and waterproof cloth, with a bright future.
PET heat shrink film is a new type of heat shrink packaging material. Due to its characteristics of easy recycling, non toxicity, odorlessness, good mechanical properties, and especially compliance with environmental protection, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrink film in developed countries.
However, ordinary polyester is a crystalline polymer, and ordinary PET film can only achieve a thermal shrinkage rate of less than 30% after special processing. To obtain polyester films with higher thermal shrinkage, modification is also necessary. That is to say, in order to prepare polyester films with high thermal shrinkage, it is necessary to copolymerize and modify ordinary polyester, namely polyethylene terephthalate. The highest thermal shrinkage rate of PET film modified by copolymerization can reach over 70%.
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Heat shrinkable film
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