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Polyester is a general term for a resinous substance obtained by polycondensation of a dihydric or polyhydric alcohol and a dibasic or polybasic acid. Due to the different raw materials used, it can be divided into saturated resin and unsaturated resin. The polyester used for packaging, formerly known as polyethylene terephthalate. Also known as "Tetelon". Abbreviation code PETP, referred to as PET.
It uses polyethylene terephthalate obtained by polycondensation of ethylene glycol and terephthalate to dimethyl terephthalate as raw materials, and is formed into a thick sheet by extrusion method, and then subjected to a biaxial stretching process. Made into a film. It is a colorless, transparent, shiny film. Compared with various plastic films, it has strong toughness and elasticity, large modulus and excellent heat resistance. Therefore, it is commonly used to make "swallow boiled bags" and used as a substrate for vacuum aluminum plating. It can maintain the quality and shape of food for a long time.
Polyester film has the following advantages:
(1) High mechanical strength: The tensile strength is equal to 5-10 times that of polyethylene. Therefore, a very thin film of 12 microns can also be used. In addition, there are advantages such as strong strength and good impact resistance.
(2) The heat resistance and cold resistance are good, the melting point is 260 ° C, and the softening point is 230-240 ° C to carry out the biaxial stretching process. The shrinkage is still small at high temperatures, and has extremely excellent dimensional stability, that is, heating at a high temperature for a long time or at a low temperature does not affect its excellent characteristics.
(3) Good oil resistance. The drug resistance is good, and the powder and the tablet are not easily melted and deteriorated after being packaged. Excellent acid resistance. It is resistant to organic solvent attack, but is prone to deterioration when exposed to strong alkali.
(4) Water and water vapor and other gases have extremely low transmittance, so they are excellent in moisture resistance and water resistance.
(5) It has good air tightness and is good for blocking odor permeability compared with other plastic films.
(6) Good transparency and light transmittance of over 90%.
(7) Preventing poor UV transmission.
(8) With high static electricity, antistatic treatment should be carried out before printing.
(9) A single film is not easily heat-sealed, so it is generally not used alone.
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