Flat-panel TVs side frame forming of new technologies - high-gloss coating-free Seamless Injection Molding (The last part )
3. The rapid electric heating module technology. This technology to South Korea NADA's E-MOLD (ElectricityMold) system representative (as shown in Figure 4), enables ultra-high temperature mold temperature control, rapid heating and cooling is the latest molding technology. The technology uses electrical heating in a short time the surface temperature of the mold is heated to very high, then they can, within tens of seconds the temperature dropped to below 50 ℃ to help highlight the successful completion of injection molding.
E-mold technology, easy to use, by the mold temperature controller, using cold water to cool mold.
When the mold opening mold products obtained when Core began to heat. Heating temperatures in the region is not consistent, but according to the design of gate positions, such as to decide. When the mold is closed, the heating was completed, plastic injection molding shooting started. Through the instantaneous heating, higher mold temperature, makes the shot when the sol-gel mobility greatly improved, allowing low-pressure molding. A lower injection pressure means reduced stress products, and thus makes the products of heat resistance and post-processing has also been improved. More importantly, the resin flow increased, the pressure drop will be reduced, making products easy to feed a cold which led to the surface weld lines, flow marks and other flaws, greatly improving the quality of products.
E-mold technique has been widely used in household appliances shell molding, especially for flat-panel TVs before the box, decorative box, after box, forming the base, and has increasingly become the mainstream.
4. Other mold temperature control technology. Including the high frequency electromagnetic induction heating system, infrared radiation heating system and the use of South Korean TITAN technology, including high temperature machines and other mold temperature control system, but also high light has been applied to injection molding. Although they are heated in different ways, but the control principle very similar, and each has advantages and disadvantages.
Injection molding machines and injection molding process
-Free high-gloss spray injection molding machine injection molding technology for the less demanding, but the response of the machine require a higher sensitivity and stability to enable the Real-time feedback signal, and with the mold temperature control equipment coordination. The best ability is equipped with plasticizing screw, while requesting the material cut screws as small as possible.
High-gloss injection molding process control structure based on different products and molds, and mold temperature have different equipment, greater differences, but in general should follow the following principles: maximize the use of a high mold temperature, using steam heated mold, or E-MOLD technology, mold Local Area can reach 150 ℃ or higher; In order to better copy the mold surface, molding temperature should be appropriately higher, injection pressure should be as large as possible 1:00; for the smooth exhaust need to adopt multi-stage injection speed; any process of adjustment, such as screw speed, at different stages of injection speed, we must consider reducing the shear for the material.
Conclusion
With the further development of flat-panel TV technology, thinner, more stylish, and more environmentally friendly will be the future direction of product design. To this end, to avoid spraying high light Seamless injection molding technology will get more applications, and with the plastic materials, mold and injection molding equipment and the development of technology to be improved.
