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Type of Defect: |
Flow Mark |
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Description: |
Surface defect caused by insufficient flow of material |
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Observation Method: |
Visible by the human eye / as shallow lines or ripples |
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Recommendation Upon Observation: |
Better visibility under polarized light / visible as bright lines |
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Other Evaluation Method: |
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Cause |
Countermeasure |
Insufficient molding condition
Insufficient injection speed. |
Adjust injection speed |
Insufficient molding condition
Mold temperature is too low |
Adjust mold temperature (too low) |
Insufficient molding condition
Material temperature is too low |
Adjust nozzle temperature (too low) |
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Poor mold (non uniform mold dimension) |
Repair mold surface (especially: stack-ring, stamper center piece) |
