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NCK Technology Co.,Ltd

Reasons For Color Gloss Defects In Injection Molding Products

(1) The casting system of the mold is defective. The cold material well should be enlarged, the flow channel should be enlarged, the main flow channel should be polished, the runner and the gate should be polished.

(2) The mold finish is poor, the surface of the cavity is rusted, and the mold is poorly exhausted.

(3) The recycled material used is too much, the quality of plastic or colorant is poor, mixed with water vapor or other impurities, and the quality of the lubricant used is poor.

(4), the material temperature and mold temperature are low, if necessary, local heating can be used.

(5), the clamping force should be sufficient.

(6) Plastics should be fully plasticized, but the degradation of the materials should be prevented. The heat should be stable and the cooling should be sufficient, especially thick-walled.

(7) The processing pressure is too low, the speed is too slow, the injection time is insufficient, and the back pressure is insufficient, resulting in poor compactness and darkening of the surface.

(8) Prevent the cold material from entering the part, and if necessary, use a self-locking spring or reduce the nozzle temperature.

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