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Plastic Parts Flow Marks

Causes of molded parts flow marks
The cooling resin flow into the mould cavity
Injection mould temperature is too low

Associate knowledge about flow marks
In the nozzle and side slip, cooled resin flow into the mould cavity in a semi-cured state. After contact with the injection mould, the resin immediately cured, and then into a deep cavity formed flow mark.
Different thickness of the plastic parts can also cause flow mark.
Flow Marks

Instant: Increase barrel temperature and mould temperature.
Short-term: Improve the mould smooth finish.
Long-term: Choose high mobility material.

Differences in materials
Good mobility material is difficult to form flow mark.
Cause of polystyrene formed flow mark is still not clear.

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