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Injection molding products have black spots how to do?

Posted by: Mu Ju 2021-11-25 Comments Off on Injection molding products have black spots how to do?

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.


About China pintejin Molding Company Limited

pintejin mold is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

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