PET plastic, that is, polyterephthalic acid plastic, it is a polycondensate of terephthalic acid and ethylene glycol, collectively referred to as thermoplastic polyester, or saturated polyester together with PBT.
PET contains ester bonds, it is not resistant to water, acid, and alkali under high temperature and water vapor conditions. It cannot be used for thermal transfer and cannot easily accept ink infiltration. Different from ordinary paper printing, the most common applications of PET plastic are silk printing and UV printing.
UV printing technology is an ultraviolet curing technology. There are special inks, cleaning agents and ultraviolet lamps, and UV lamps are used to make each color ink dry instantly when passing through the UV lamp. The CMYK four-color superposition is clearer, and the inks will not merge with each other. , The picture is blurred.
The application of screen printing is also very extensive. At present, many cosmetic PET plastic packaging on the market are screen printing, which has fresh colors, high saturation, comfortable hand feeling and smooth surface.
Each type of plastic has its own characteristics, and the appropriate printing technology is selected according to its characteristics. Printing technology has been widely used in the plastics industry.
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