Large two-color injection molding technology

Is a two-color injection molding can produce a high gloss surface and with two different colors inside and outside plastic parts technology, the technology can greatly improve the appearance of the effect of the whole product. Large two-color injection molding using a large rotary-color injection molding machine, mold plastic outer layer after the first injection, after the mold cavity with plastic parts with the rotary table rotate 180 °, again after the inner mold plastic injection, the final mold ejection. In continuous production, the outer and inner injection injection at the same time, the conventional injection molding cycle was close. Large two-color injection molding technology and high-light-free injection technology combined with melting mark application, the production of high-temperature high-pressure hot water or steam heated mold, and after the injection of cooling medium to quickly switch the rapid cooling of the mold to get the surface and no melt marks high gloss two-tone plastic, can significantly improve the whole look.http://www.prmindustry.com/Abstract...Articles section With the normal tool and now widely used small color / two-component injection molding compared to large-scale two-color injection mold of the product characteristics, mold structure, the action sequence, set gate, runner layout, etc. are quite different, greatly increase the difficulty. As the two were inside and outside the injection molding, two large two-color injection mold cavity needs, two cores, two of the cavity to be identical and interchangeable with the two cores can match; two gating system are located In the core side, the structure is reversed; ejection are also located in the core side, the use of hydraulic ejection. Coupled with the cooling system, the core side of the greatly increased complexity of the structure.
Optimization in the design of plastic parts, the first forming the outer shape of the needs as simple as possible, forming the inner layer of the second bar can be designed, 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 the plastic parts of the surface appearance of the color gradient showing the effect of outer ring thickness can be taken weekly from thin to thick gradient design.
In the molding process, the second large-scale two-color injection molding technology, plastic molding along the first surface of the plastic flow, prone to bubbles, color, running, such as plastic injection molding defects, the need for repeated testing injection molding process parameters and precise control, combined with the shape of the mold to improve and optimize.
Large two-color injection molding technology to produce high-gloss, high efficiency, good surface quality, inside and outside the two colors with the flexibility to match, can greatly enhance the whole appearance and grade of product. Currently, the technology is large-size LED-backlit LCD TV to be more widely used, future high-end refrigerators, air conditioners and other appliances also have broad market prospects.

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         Peter  Huang