Material contains trace amounts of water, in addition to causing silver streak, wave current pattern, whitening, bubbles and other undesirable phenomena will also occur. It also has bad effect on the flow ability and thermal deterioration of material.
Silver Streak
If the temperature gradient is too large, the flowing material will be easy to cut.
If gas evolution is not well in the injection mould, it can also occur silver streak.
Injection moulding defects generally decide by mould shape and material liquidity. When defect is due to the setting of moulding material, injection moulding condition setting should be set towards the right direction, namely to improve the mould and barrel temperature, injection pressure and speed.
Spiral flow mould
If the cavity exhaust edge is not well designed, the air in the mould will be difficult to be discharged. In addition to cause moulding defect, it will also cause burn mark and fusion mark.
In the production process, sink mark is the highest frequency of occurrence of undesirable phenomena in plastic injection mould. The early cooling part surface will be hard first, at the same time, the internal will produce bubbles. The sink mark is the concave surface in the direction of contraction of the bubble of the slow cooling part.
Avoid sink marks
Materials with large shrinkage are also easy to produce sink mark. When you want to change the moulding conditions to eliminate sink mark, you should set conditions to a low contraction direction. That is to reduce plastic mould and cylinder temperature, increase injection pressure. It should be noted that this may cause internal residual stress.
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