← Defect Guide
Stringing/Drooling
Resin drawing into thin strings from the nozzle (stringing) or drooling as droplets before the mold opens.
◆ Common Causes
- •Nozzle temperature too high
- •Insufficient decompression (suck-back)
- •Melt temperature too high
- •Nozzle orifice too large or worn
- •Insufficient nozzle-tip cooling
◆ Solutions
- ✓Lower nozzle temperature
- ✓Increase decompression (suck-back)
- ✓Lower melt temperature
- ✓Review reverse-taper nozzle or orifice size
- ✓Adjust nozzle-tip temperature profile
◆ Resin-Specific Notes
PA
Low viscosity and semi-crystalline → drools easily. Manage decompression and nozzle temp.
PP
Low viscosity. Watch for excessive nozzle temperature.
PE
Low viscosity. Prone to stringing.
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This content is a field-reference summary. Final judgment requires on-site engineer verification.