The heat resistance of plastic matrix is poor as coating matrix material
So that the deposition temperature is restricted plastic belongs to polymer organic matter, heat resistance is poor, especially optical plastic, generally want to be coated at the temperature of 35 ~ 45℃. However, no matter what method is adopted in vacuum coating, the substrate is affected by heat, such as radiant heat from evaporation source, kinetic energy of high-energy sputtering atoms hitting the substrate and condensate energy of the coating material atoms, which will cause the temperature of the substrate to rise. The temperature of the substrate is controlled within the allowable range so that the deposition temperature of the vacuum coating is restricted.
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