← Defect Guide
Jetting
High-velocity melt jetting from the gate creates serpentine marks on the part surface.
◆ Common Causes
- •Injection speed too high
- •Gate size too small
- •Poor gate location (direct injection into open space)
- •Melt temperature too low
◆ Solutions
- ✓Reduce injection speed (1st stage)
- ✓Enlarge gate size
- ✓Change gate location or direction
- ✓Raise melt temperature
- ✓Multi-stage injection (start slow)
◆ Resin-Specific Notes
General
Placing a wall opposite the gate suppresses jetting.
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This content is a field-reference summary. Final judgment requires on-site engineer verification.