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Why vacuum aluminum plating on plastic parts of automobile lamps?

Why vacuum aluminum plating on plastic parts of automobile lamps?

2022-06-20

Why vacuum aluminum plating on plastic parts of automobile lamps?





Ordinary people can't imagine how tough a normal car PC headlamp cover is. We used to test it by smashing it with a baseball bat, but it was very difficult to break it, often leaving only traces on the surface. However, there is a lampshade. After spraying the antifogging coating, if you hit the drawing area in the lamp shade with your fist, the lamp shade will crack. Why is that? After the original antifogging coating is sprayed, the crack defect is further enlarged, just like the triangular notch on the plastic package designed to facilitate opening the package. Later, the structure was optimized and the wall thickness was increased. The impact strength test (ball drop test) showed that it met the international standard.

There are many common aluminum defects on the surface of the object, such as yellowing, bluing, aluminum explosion (the aluminum products are not completely gasified, and the blocks stick to the surface of the products), etc. There are also those who fail the performance test, such as the "100 square meters test" (i.e. the adhesion of the aluminum layer is insufficient), the surface corrosion resistance test, the high temperature test, and so on. For space reasons, we give an example of low adhesion.


This product is made of PC material. The adhesion test after aluminizing is unqualified, and the aluminum layer is "pulled up by roots" when the tape passes. Later, we changed the aluminizing process, sprayed a layer of silicon dioxide on the substrate for "priming" treatment, and then carried out conventional aluminizing, so that there was no problem with the adhesion test.


Surface spraying

What is the paint sprayed on the plastic parts of the car lamp and what is its function?

Generally speaking, the headlamp lens needs to be painted. Spray hardened paint outside and anti fog paint inside (generally not for low-end vehicles).

① Harden paint: most automobile headlamp covers are made of PC. The surface of the molded PC lampshade is very soft and can leave obvious marks with nails. After a layer of hardening paint is sprayed on the outer surface of PC lampshade, the surface is hard, which can avoid those slight scratches.

② Anti fog coating: if you carefully observe in life, you can find that some cars parked on the roadside will have a layer of fog on the headlights. We learned in primary school that it is water droplets condensed from pre cooled water vapor. The purpose of spraying anti fog coating inside the lampshade is to increase the tension on the inner surface of the lampshade, make small water drops become water film, reduce the divergence of light, and reduce the influence of fog on the light distribution of lamps.


How to solve common spraying problems?

Spraying also has many defects, such as orange peel, sagging, particles, etc., Spraying technicians are no strangers to this. "Flow, atomization, sector, UV, IR, time, air cleanliness" and other relevant parameters can be adjusted slowly, and will not be repeated here.

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