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Injection molding defect 5~Burn mark

 It is the defect which burns the surface of part.

However it does not come inside the surface of plastic material.

Sometimes the temperature of barrel is too high ,we should maintain it accordingly material we are using

Next is Injection speed and injection pressure is too high

So that burn mark appears we have to reduce it.

If the raw material using is mixed to one another then burn is sure to appear.

If venting is bloked or not visible then burn mark will come so there is need to make a venting

If there is any type of overpaking due to increase in holding speed,pressure or time


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