◆ Common Causes
- •Insufficient clamp force
- •Excessive injection pressure or hold pressure
- •Worn or damaged parting line surface
- •Insufficient mold rigidity
- •Melt temperature too high (viscosity drops)
◆ Solutions
- ✓Increase clamp force or reduce projected area
- ✓Reduce injection pressure and hold pressure
- ✓Repair parting line surface
- ✓Reduce injection speed
- ✓Lower melt temperature
◆ Resin-Specific Notes
PA
Low viscosity and semi-crystalline → prone to flash. Ensure sufficient clamp force.
PPS
Very flash-prone. Ensure sufficient clamp force.
LCP
Extremely low viscosity. Highest flash risk. Mold precision is critical.
PC
High viscosity, but flash possible at elevated temperatures.
PP
Low viscosity. Watch for flash.
◆ Resins Prone to This Defect
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This content is a field-reference summary. Final judgment requires on-site engineer verification.