In the process of LED lighting being gradually accepted by the market, LED lighting mask problems have been troubled lighting manufacturers. It is necessary to have a high light transmittance, but also a considerable light diffusion rate and a good light source concealment. Improving the effect of lighting, LED dazzling light source becoming more gentle and health are the current direction of research and development . Initially we use glass as a shade,but it is difficult to meet the lighting requirements because of the glass fragile, poor diffusion effect. Later, instead of glass with resin, the advantage is high transmittance, but the light diffusion effect is not ideal. So the diffusion mask has been plagued by the contradiction between light transmittance and light shielding. It is under such circumstances the diffusion plate with acrylic diffuser (PMMA), PS, PC plastic sheet as substrate came into being.
Acrylic can be used casting, injection molding, extrusion, thermoforming, laser engraving, laser cutting and other processes. Casting molding Casting molding for forming plexiglass sheet, bar and other profiles, that is, body-bulk polymerization method of forming profiles. After casting molded products need to be post-processed, post-processing conditions are incubated at 60 ℃ 2 hours, 120 ℃ for 2 hours. Injection molding Injection molding using suspension polymerization obtained pellets, molding in the ordinary plunger or screw injection molding machine. Process parameters include screw injection molding machine, plunger injection molding machine, barrel temperature, injection molding products also need to eliminate the internal stress treatment, processing in the hot air circulation oven at 70 ~ 80 ℃, processing time as the thickness of acrylic products, the general All about 4 hours. Thermoforming Thermoforming is the process of making plexiglass sheets or she...
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