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Large double injection molds used in the LED LCD TV

In recent years, LED-backlit LCD TV with its energy-saving, environmental protection, beautiful and slim features, is gradually becoming the mainstream market. Large-size LED backlit LCD TV mainly use plastic, because the front of the TV shell border narrow, the whole thickness is thin, so the size of the injection molded products of high stability requirements, and LED backlit LCD TV as a high-end home appliances, consumers pay more attention to their appearance, so the current LED-backlit LCD TV the widespread adoption of high-light fusion-mark injection molding, two-color injection molding and other high-end technology.

Color injection molding is a way to produce a high gloss surface and the inner and outer layers of different colors of plastic parts with technology, application of this technology can greatly improve the appearance of the whole product.

Large color injection molding using rotary large color injection molding machine, the first for the outer layer of plastic injection mold, after the mold cavity with plastic parts with a rotary table rotate 180 °, carried out the inner plastic injection mold again, Finally, the top of the mold. In continuous production, the outer and inner injection injection at the same time, so the conventional injection molding cycle was close.

Large color injection molding technology with high light injection technology with fusion-mark application, the production of high temperature high pressure hot water or steam heated mold, and quickly switch after completion of the injection mold cooling medium rapid cooling to obtain a surface having no melting marks color high gloss plastic parts, can significantly improve the appearance of the machine. Compared with ordinary mold and small color now widely applied / two-component injection molding, large double injection mold in product features, the mold structure, action sequence, gate settings, runner layout has a very different, much more difficult increase. Because it is the inner and outer layers are injection molding, double injection molds need two large pockets, two cores, two of which are identical to the cavity, and the two can be used interchangeably with the core; two are located in the gating system the core side, belongs to the anti-loaded structure; also are located in the top of the core side, the use of hydraulic ejection. Together with the cooling system, the complexity of the whole structure of the core side is greatly increased.

In optimizing the design of plastic parts, the first forming the outer shape of the need as simple as possible, and the second forming the inner layer can be designed ribs, columns and other structures, but must take full account of the gate layout and material flow patterns, through CAE analysis to optimize the design. To make plastic parts design surface rendering color gradient effect, the wall thickness of the outer edge ring may take weeks from thin to thick gradient design.

In the molding process, the second large-scale color injection molding technology, plastic along the first surface of the molded plastic parts were flowing, prone to bubbles, color, run, such as plastic injection molding defects, the need for repeated testing of injection molding process parameters and precise control, combined with the molding conditions to improve and optimize mold.

Hisense Mould from the first half of 2009 the company started to develop large-scale two-color injection mold, through the efforts of research, breaking a number of key technologies in the development of a domestic first reached the international advanced level of large-scale color high light injection mold, successfully applied to Hisense large-size LED backlight LCD TV. At present, Hisense Mould Company has fully mastered the large color high light injection mold product optimization, mold development and process control technology, has developed a T29, T39 two series of more than a dozen large-format color high light injection mold, can produce suitable for the maximum size 55-inch LED-backlit LCD TV chassis, the production of qualified rate of over 90%.

Large color high-gloss injection molding technology to produce high efficiency, good surface quality, both inside and outside the two colors to match the flexibility needed, can greatly improve the appearance and quality of the whole product. Currently, the technology is being more widely used on a large LED backlit LCD TVs, the future of high-end refrigerators, air conditioners and other household electrical appliances also has a broad market prospect.

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