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The main cause of plastic color analysis

2016-11-23    Shenzhen Runpeng Precision Hardware Co., Ltd.    Read:0

Equipment:

1. The equipment is not clean. Dust or other dust deposition on the hopper discoloring the contaminated material.

2. The thermocouple, temperature controller, or heating system disorder caused by temperature control failure.

3. The barrel has obstacles, easy to promote plastic degradation; With metal foreign body between the barrel and 

    screw groove, continuous grinding plastic color.

Mold:

1.Mold venting is not good, the plastic is adiabatic compression, intense reaction under high temperature and high 

   pressure with oxygen, burn plastic.

2.Mold runner is too small.

3.Material or die lubricants, release agent in too much. When necessary should regularly clean cylinder to remove than 

   plastic additive such as antistatic property of heat resistance    is poor.

4.The nozzle hole, the mainstream way and the size is too small.

Process:

1.The screw rotation speed is too high, plastic back pressure is too big.

2.The barrel, nozzle temperature is too high.

3.The injection pressure is too high, time is too long, the injection speed is too fast to make products become angry.




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