Why does the PC lamp cover crack?
Why does the PC lampshade crack? I believe many people want to know this problem. With the development of the lighting industry, PC lampshades are becoming more and more common in everyday lighting fixtures. Of course, everyone will pay more and more attention to the quality of PC lampshades.
This article mainly introduces the PC lampshade in the LED fluorescent lamp. Various problems will occur in the daily use process, especially the crack phenomenon, which makes many friends in the LED industry very confused. Below, we analyze the reasons for the cracking of the PC lampshade and find out how to choose a good PC lampshade.
The reason why the PC lampshade cracks is that the PC molecular chain structure is damaged and the molecular chain is broken, causing cracking or cracking of the surface. There are several factors that affect the structure of the molecular chain:
1. Repeated use of materials. In order to reduce the cost, some PC lampshade manufacturers will add some or even secondary reclaimed materials. When the PC material is used repeatedly, the molecules will fission under the action of constant high temperature, and the molecular chain will be broken and cracked. From a high molecular substance to a low molecular substance, the material becomes brittle.
2, the stress is too large, divided into two. First of all, the shape of the product itself and the size of the mold itself and the stress generated by demolding. Second, the stress that the outside world gives to the product. If the stress is too large, the molecules will break.
3. Environmental factors. The main component of PC is polycarbonate. The glass that intersects the traditional lamp tube can easily react with the gas generated by glue, washing water or other components in the LED tube, causing the lampshade to become brittle and crack. In addition, PC lampshades are also susceptible to impact and reduce service life in acid-alkaline, high-ultraviolet, high-low temperature environments.
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