What is the Polyester film?
|Polyester film is made of polyethylene terephthalate as a raw material, made by extrusion method thick film, and then made of biaxially stretched film material. PET film Environmental film PET film Milky white film and other printing and packaging supplies are widely used in glass steel industry, building materials industry, printing industry, medicine and health. Polyester film is also called polyester film light sheet polyester film photosensitive paper polyester film benzene tin film cellophane release film.|
Polyester film is usually a colorless, transparent, glossy film (now it can be added with additive particles to make it color), excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature, chemical resistance Good chemical resistance, oil resistance, airtightness, and fragrance retention are one of the commonly used barrier composite film substrates, but the corona resistance is not good. The price of polyester film is relatively high, and its thickness is generally 0.012mm. It is commonly used as the outer layer material for cooking and packaging, and the printing property is better. Due to the complexity and difficulty in judging the polyester film, it has brought a lot of difficulties to the supervision of the customs.
The biaxially stretched polyester film is a high-grade film that uses a light material that is dried, melted, extruded, cast, and stretched vertically and horizontally, and is widely used. Biaxially-stretched polyester film is characterized by high strength, good rigidity, transparency and high gloss; odorless, odorless, colorless, non-toxic, outstanding toughness; its tensile strength is 3 times that of PC film and nylon film. Impact strength is 3-5 times that of BOPP film, excellent abrasion resistance, folding resistance, pinhole resistance and tear resistance, etc.; heat shrinkability is extremely small, at 120°C, only shrink after 15 minutes 1.25%; Good antistatic property, easy to vacuum aluminizing, can apply PVDC, so as to improve its heat sealability, barrier property and printing adhesion; BOPET also has good heat resistance, excellent resistance to cooking , resistance to low temperature freezing, good oil resistance and chemical resistance. In addition to nitrobenzene, chloroform, and benzyl alcohol, most BOPET films cannot dissolve it. However, BOPET will be attacked by strong alkali and should be used with caution. BOPET film has low water absorption, good water resistance, and is suitable for packaging foods with high water content.