Some transparent plastic parts, white plastic parts or light colored plastic parts in injection molding products often appear black spots in injection molding. I believe that some people feel headache. Why is this phenomenon? That is because of the decomposition of plastic or combustible volatiles in the material, air, etc. decomposition and combustion under high temperature and high pressure. The combustion material is injected into the plastic cavity with the melt material, and the surface of the plastic parts is black spots.
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What should we do when we meet this problem?
1. check whether there is black spot in the raw material, and the drying bucket shall be thoroughly cleaned.
2. completely spray the empty adhesive, clean the material pipe thoroughly, reduce the temperature of the molten material and reduce the residual material quantity.
3. increase the gate size and reduce the injection speed.
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