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Type of Defect: |
Flashing |
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Description: |
Membrane generating on the periphery of the disc caused by excessive material |
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Observation Method: |
Visible by the human eye |
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Recommendation Upon Observation: |
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Other Evaluation Method: |
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Cause |
Countermeasure |
Excessive feed
Material temperature is too high |
Adjust cylinder temperature (too high) |
Excessive feed
Injection pressure too high |
Adjust holding pressure (too high) |
Excessive feed
Injection pressure too high |
Adjust injection pressure (too high) |
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Excessive feed |
Adjust injection speed (too fast) |
| Excessive feed |
Adjust mold temperature, too high |
Excessive feed
Material temperature is too high |
Adjust nozzle temperature (too high) |
Excessive feed
Erratic feed |
Adjust unequal filling rate in cavities |
Mold not sealing-off (Cause: equipment)
Mold plates not parallel |
Adjust machine plates not parallel. |
Mold not sealing-off (Cause: equipment)
Poor parting line or mating surfaces. |
Adjust mold temperature (too high) |
Mold not sealing-off (Cause: equipment)
cause by foreign particles |
Check and clean the parting surface of mold, to prevent it from not sealing-off caused by foreign particles |
Mold not sealing-off (Cause: equipment)
Mold plates not parallel |
Correct mold plates not parallel. |
Mold not sealing-off (Cause: equipment)
Insufficient support for cavities and cores |
Make correction for insufficient support for cavities and cores. |
Mold not sealing-off (Cause: equipment)
Poor parting line or mating surfaces. |
Repair cavities and cores out of line |
Mold not sealing-off (Cause: setting value)
Insufficient clamping condition |
Adjust clamping force (too low) |
Mold not sealing-off (Cause: setting value)
Insufficient clamping condition |
Adjust cylinder temperature (too low) |
Mold not sealing-off (Cause: setting value)
Insufficient clamping condition |
Check clamping capacity of machine against projected area of the molding parts |
