← Defect Guide
Short Shot
Incomplete filling — the product is not fully formed. End sections or thin walls remain unfilled.
◆ Common Causes
- •Insufficient injection pressure/speed
- •Melt temperature too low (high viscosity)
- •Undersized gate or runner
- •Poor venting (trapped air)
- •Insufficient shot size (metering)
◆ Solutions
- ✓Increase injection pressure and 1st-stage speed
- ✓Raise nozzle/barrel temperature
- ✓Enlarge gate or improve runner
- ✓Add or clean vents
- ✓Increase metering stroke
◆ Resin-Specific Notes
PA
Semi-crystalline: sharp viscosity change with temperature. Temperature control is critical.
PBT
Fast crystallization. Ensure adequate gate size.
PC
High viscosity. Requires high temperatures (280–320°C).
ABS
Relatively easy to process, but temperature management required.
LCP
Extremely low viscosity. Short shot is rare.
◆ Resins Prone to This Defect
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This content is a field-reference summary. Final judgment requires on-site engineer verification.