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Why is there a discoloration problem in plastic injection molding?

by:Vowin Rapid Prototyping     2023-02-19
In plastic injection molding, the problem of plastic discoloration sometimes occurs, which is also a headache. Today, we will analyze the reasons for the discoloration of injection molded products.

plastic mold processing factory
One: Injection molding machine

(1) The cleaning of the injection molding machine is not in place. Dust or other dirt deposited on the hopper can contaminate the raw material.

(2) The thermocouple, thermostat or heating system on the injection molding machine is out of adjustment, resulting in uncontrollable temperature.

(3) There are obstacles in the barrel of the injection molding machine, which can easily cause plastic degradation.

Two: injection mold
(1) The injection mold exhausts, but it reacts violently with oxygen under high temperature and pressure, which will burn the plastic.

(2) The gate of the injection mold is too small.

(3) There are too many materials or in-mold lubricants and mold release agents.

Three: plastic injection molding process

(1) The screw speed is too high, and the pre-plastic back pressure is too large.

(2) The barrel and nozzle temperature are too high.

(3) The injection pressure is too high, the time is too long, and the injection speed is too fast to change the color of the product.

Four: raw materials

(1) The material is contaminated.

(2) High moisture and volatile content.

(3) Decomposition of colorants and additives.
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