Tungsten Heater for Aluminum Film of Automotive Light - Aluminizing Substrate

The lighting system of a motor vehicle consists of lighting and signalling devices mounted or integrated to the front, rear, sides, and in some cases the top of a motor vehicle. This lights the roadway for the driver and increases the conspicuity of the vehicle, allowing other drivers and pedestrians to see a vehicle's presence, position, size, direction of travel, and the driver's intentions regarding direction and speed of travel. Emergency vehicles usually carry distinctive lighting equipment to warn drivers and indicate priority of movement in traffic. Automotive light are divided into the headlight lamps, fog lights, tail lights and other decorative lights. Fog lights will be opened as a warning for other vehicles in rain, fog, snow and other low-visibility weather conditions. Its aluminizing component is reflector. Taillights include turn signals, brake lights, rear fog lamps, reversing lights, etc., its aluminizing parts is lamp body.

The substrates of aluminizing part of the lights are based on polycarbonate, acrylonitrile - butadiene - styrene, polypropylene, PBT (polybutylene terephthalate). Lamps require thermal temperature of polycarbonate material should above 185℃. Taillights can endure temperature below 80℃in average, which is lower than headlight, what’s more, its lamp structure is relatively simpler.

Heat resistance of substrate for vacuum aluminizing should be better, and the content of volatile substance should be lower. In the tungsten heater for aluminizing process, the substrate would affect by radiant heat of evaporator source and heat of evaporation evaporant, if the heat resistance of the substrate is poor, during the heating time it will have thermal deformation, and finally result in wrinkles and shrinkage of coatings. In addition, small molecules volatiles inside the substrate are easy to evaporate, which has an impact on the quality of aluminum layer. Therefore, content of the small molecules volatiles inside the substrate should be very low.

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