Causes of color and luster defects of injection molded products
Under normal circumstances, the surface gloss of injection molded parts is mainly determined by the type of plastic, colorant and surface finish of the mold. But often because of some other reasons, the surface color and luster defects of products, surface dark and other defects. The causes and solutions are as follows:
(1) Poor finish of the mold, rust on the surface of the cavity, poor exhaust of the mold.
(2) The pouring system of the mould is defective, so it is necessary to increase the cooling well, flow channel, polishing main flow channel, shunt channel and gate.
(3) The material temperature and mold temperature are low, if necessary, the local heating method of gate can be used.
(4) Processing pressure is too low, speed is too slow, injection time is insufficient, back pressure is insufficient, resulting in poor compactness and dark surface.
(5) The plastics should be fully plasticized, but the degradation of materials should be prevented, the heating should be stable, and the cooling should be sufficient, especially for thick wall plastics.
(6) To prevent the cold material from entering the parts, use the self-locking spring or reduce the nozzle temperature when necessary.
(7) Too much recycled materials are used, the quality of plastics or colorants is poor, water vapor or other impurities are mixed, and the quality of lubricants is poor.
(8) The clamping force should be enough.
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luster defects
injection mold products
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