What is the reason for the discoloration of
injection molded parts ? Let's take a look at the following Jiuzhi Plastics Network:
Equipment aspect
(1) The equipment is not clean. Dust or other dust deposits on the hopper to contaminate the material.
(2) Temperature control failure due to thermocouple, temperature controller or heating system imbalance.
(3) There are obstacles in the barrel, which tends to promote the degradation of plastics; metal foreign objects are stuck in the barrel or the screw groove, and the plastic is continuously ground to discolor the plastic.
Mold aspect
(1) The mold is poorly exhausted, the plastic is adiabatically compressed, reacts with oxygen at high temperature and high pressure, and burns the plastic.
(2) The mold gate is too small.
(3) Too much lubricant or mold release agent in the material or in the mold. If necessary, the cylinder should be cleaned regularly to remove additives such as antistatic properties that are inferior to the heat resistance of plastics.
(4) The size of the nozzle hole, the main flow path and the branch passage are too small.
Process aspect
(1) The screw speed is too high and the pre-plastic back pressure is too large.
(2) The temperature of the barrel and nozzle is too high.
(3) The injection pressure is too high, the time is too long, and the injection speed is too fast to cause discoloration of the product.
Raw material
(1) The material is contaminated.
(2) High moisture and volatile matter content.
(3) Decomposition of coloring agents and additives.
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