Tungsten Heater for Aluminum Film of Car Light - Aluminizing Method

Thickness of aluminum film of automotive light is generally 0.4 ~ 1.2μm, its surface is smooth and clean, and has a high gloss. Method of tungsten heater for vacuum aluminizing of automotive light can be divided into no bottom plating and bottom plating. Users can select the appropriate aluminizing method in according with the different properties of the substrate.

Polyesters belong to polar polymers, free energy of its surface is high, and its tension is 40dyn / cm or more, which can adhere with the aluminum layer well, so it can be used as bottom plating. That means that the protective film can be directly coated on the substrate again. Aluminum protective film can improve mechanical strength, and prevent the aluminum film from harmful gases or substances, which make the coating has a bright metallic luster, excellent gas and light barrier properties, good moisture property, heat resistance, puncture resistance. In addition, in transport and storage of goods, it can maintain smooth and glossy without any pollution and corrosion. Since the PC (Polycarbonate ) main chain contains an esterfunction, in a humidified environment of room temperature, water absorption of based material is high. It is better to aluminizing the products within 2 hours after depanning, if it is stored for a long time, substrate would absorb water and there exist mist after the aluminizing.

PE (Polyethylene ), PP (Polypropylene) and other polyolefin materials and ABS (Acrylonitrile Butadiene Styrene ) belong to non-polar polymer. The free energy and tension of their surfaces are small and rough, so the binding force between the aluminum layers is poor, which would finally affect the quality of coating. Therefore, these materials are generally used for aluminizing after pre-primed in order to improve the binding force between the coating and the substrate. Plastic parts of automotive light mostly made after pre-primed aluminum and then coated with a protective film.

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