Currently, the coating technology used for plastic components in lamps is mainly achieved through evaporation plating and magnetron sputtering. However, evaporation plating remains the most commonly used method due to its cost-effectiveness and suitability for many applications. As living standards improve and the automobile industry expands, the production of auto parts has also advanced significantly, and the coating techniques for lamp components are no exception.
In general, the process involves applying a thin layer of aluminum film to the plastic parts, which is ideal for achieving a reflective surface. Aluminum has a relatively low melting point, and since the plastic materials used in lamps typically have a higher melting point, this makes evaporation plating a viable option. Additionally, vacuum evaporation coating equipment is more affordable compared to other methods, making it a popular choice in the industry.
Dongguan Huicheng Vacuum Technology Co., Ltd. has specifically developed vacuum coating machines tailored for lamp components, using the principle of evaporation plating. Before the coating process begins, the incoming plastic parts must be thoroughly dried. These parts often contain moisture, so drying usually takes three to five hours at a controlled temperature of 50 to 60°C. Excessive heat can cause deformation, even if the material doesn't melt.
During the injection molding stage, care is taken to avoid oil contamination on the plastic parts, as any oil can interfere with the coating process. If necessary, parts can be cleaned and degreased to remove excess oils. Afterward, dust is removed using a vacuum cleaner. Since plastics generally have a rough surface, a primer is applied first, followed by baking at 60 to 70°C for 1.5 to 2.5 hours.
The vacuum pump then reduces the pressure to between 1 and 2 x 10â»Â² Pa. Under these conditions, aluminum is heated using a tungsten wire, causing it to evaporate and deposit onto the surface of the plastic part. Once cooled, the aluminum film is baked to ensure adhesion. To prevent oxidation or chemical reactions with the air, a protective lacquer is applied and cured, completing the coating process for the lamp's plastic components.
Aluminum-coated plastic parts significantly enhance the light reflection of the lamp, making it more efficient and visually appealing. This technique has become essential in modern lighting design. For more information about Huicheng’s vacuum coating equipment, visit their website.
Date: July 16, 2013
Source: http://news.chinawj.com.cn
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