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Flow Lines

Flow Lines
Possible Cause Suggested Remedy
Melt temperature too low Increase melt temperature
Mould temperature too cold Increase mould temperature
Gate size too restrictive, causing jetting a. Increase gate size
b. Decrease injection rate
Material impinging on cavity wall or core a. Decrease injection rate
b. Relocate gate
Non-uniform wall thickness Redesign part to obtain a more uniform wall thickness to provide for optimum filling
Insufficient mould venting Improve mould venting