Quality requirements for PPGI Steel Coil film

The quality requirements of PPGI Steel Coil plastic film coating are: the thickness directly affects the film’s light transmittance, refraction, film fastness, and mechanical strength. Between is appropriate. It must be treated by corona or other methods, and the surface tension inside the place should reach 4Pa to have better wettability and adhesion performance. The inside of the corona place should be uniform. The higher the transparency, the better to ensure the best clarity of the covered print.
Transparency-light transmittance is expressed by the percentage of transmitted light and transmitted light. The light transmittance of PET film is generally 88%-90%. The light transmittance of several other films are usually between 92% and 93%. Good light resistance, that is, it is not easy to change color under long-term irradiation of optical fibers and has specific mechanical strength and flexibility. The mechanical strength of the film includes tensile strength, elongation at break, elastic modulus, impact strength and folding times, etc., technical indicators.
The geometric size should be stable, and it is often expressed by indicators such as hygroscopic expansion coefficient, linear expansion coefficient, and heat distortion temperature. In addition, the coated film must have specific chemical stability to contact solvents and adhesives. Appearance The film surface should be flat, free of unevenness and wrinkles, and the film is also required to be free of bubbles, shrinkage pinholes, pitting, etc., and the film surface should be free of dust, impurities, grease, and other pollution.