What happens when the pi film is coated too thick?

Coating too thick pi film will affect the phase element and interfere with the measurement.

1, pi film, the full name of polyimide film, is the best film insulation material in the world, which is made of pyromellitic dianhydride and diaminodiphenyl ether by polycondensation, casting and imidization in a strong polar solvent.

2. Yellow and transparent, with a relative density of 1.39 ~ 1.45. The polyimide film has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance and dielectric resistance, and can be used in the temperature range of -269℃ ~ 280℃ for a long time, and can reach the high temperature of 400℃ in a short time.

3. The equipment and process of impregnation method are simple, but aluminum powder often sticks to the surface of the film, which limits the length of the film and has low production efficiency. This method is not suitable for development. The salivation method has the advantages of high precision, good film uniformity, clean and flat surface, unlimited film length, continuous production and good film performance in all aspects. In this way, commonly needed films can be produced. The properties of the film produced by stretching method have been significantly improved, but the process is complex, the production conditions are harsh, the investment is large and the product price is high. Only high-quality movies can adopt this method.