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Publicado por en Conocimiento - Fabricante de láminas PET/PP/PS con 20 años de experiencia
PET is also called polyethylene terephthalate crystalline polymer with a density of 1.30 to 1.38 g/cm? The melting point is 255°C to 260°C. It has the greatest toughness among thermoplastics, and its film tensile strength is comparable to that of aluminum foil, 9 times that of polyethylene, and 3 times that of polycarbonate and nylon. Polyethylene terephthalate maintains its excellent physical and mechanical properties over a wide temperature range, and the effect of temperature from -20°C to 80°C is minimal. Although the permeability of polyethylene terephthalate is larger than that of polyvinyl chloride, it is still a good gas barrier as a packaging material. For a 25um thick film, the oxygen permeability is 29cm? /m? Mpa, CO2 130cm? /m? Mpa, low hygroscopicity, 1 week of immersion in 25°C water, hygroscopicity < 0.6%, maintaining dimensional stability. Polyethylene terephthalate is resistant to hydrofluoric acid, phosphoric acid, acetic acid and glycolic acid at higher temperatures, but hydrochloric acid, sulfuric acid and nitric acid can damage it to different degrees, such as a decrease in tensile strength.
Strong alkali, especially at high temperature, can make its surface hydrolysis, of which the effect of ammonia is more dramatic. Ethyl acetate, butanone; xylene, naphtha, ethylene glycol methyl ester, methanol, acetic acid, etc., at room temperature or near their boiling point temperature is not eroded, dissolved in a mixture of o-chlorophenol, tetrachloroethane, cresol or an excess of nitrobenzene. The performance of polyester sheet series polyester sheet series include PETG, APET, PCT and other varieties, which are new sheet products developed and developed rapidly in recent years. Polyester sheet has excellent overall performance, high transparency, good strength, easy post-processing and many other advantages. Due to good strength, the same thickness of the product, its protective effect is significantly better than PVC sheet, if the same strength to compare, it is available thinner polyester sheet, so although the polyester sheet weight price is higher, but the actual cost increase is not much, the main thing is that the polyester sheet transparent crystal increased the effect of packaging, so that the packaging on a higher level.
And then it is non-toxic, odorless, tasteless, in line with the health requirements of food packaging, it is no PVC sheet will be burned when the secondary pollution of the environment, in the case of PVC sheet banned from use in disposable packaging, can meet the packaging applications have a higher strength sheet, no doubt polyester sheet. Polyester sheet processing (blister or folding box) is convenient, ordinary blister machine will be able to normal processing, the same efficiency and PVC sheet, so the original production of PVC sheet blister products without any transformation of equipment.
