← Defect Guide
Flow Mark
Wavy or streaky marks along the flow direction, mainly from low mold temperature or injection speed.
◆ Common Causes
- •Mold temperature too low (especially early shots)
- •Injection speed too low
- •Melt temperature too low
- •Flow restriction at gate/runner
- •Insufficient warm-up
◆ Solutions
- ✓Raise mold temperature (into recommended range)
- ✓Increase injection speed
- ✓Raise melt temperature and injection pressure
- ✓Consider enlarging the gate
- ✓Warm up before judging early shots
◆ Resin-Specific Notes
PP
Prone to waviness at low mold temperature. Secure mold temp.
ABS
Improves well with mold temperature and speed.
PC
High viscosity. Adequate melt and mold temperature.
◆ Resins Prone to This Defect
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This content is a field-reference summary. Final judgment requires on-site engineer verification.