PET is polyethylene terephthalate. Is a common resin in life, PET can be divided into APET, RPET, PETG.PET molecular structure is highly symmetrical, with a certain degree of crystal orientation, so it has a higher film and sex. PET has good optical properties and weather resistance, and amorphous PET has good optical transparency. In addition PET has excellent abrasion resistance, dimensional stability and electrical insulation. Bottles made of PET have been widely used due to their high strength, good transparency, non-toxicity, anti-infiltration, light weight, and high production efficiency. The structure of PBT is similar to that of PET, and most of the properties are the same, but the molecular backbone is changed from two methylene groups to four, so the molecules are more compliant and the processability is better.

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