| Possible Cause |
Possible Solution |
| Available melt volume is insuffiecient. |
Increase injection fill time.
Make sure nozzle and runners are clear
of obstructions.
Increase front barrel zone temperature.
Increase nozzle temperature.
Verify operation of non-return check valve
on screw. |
| Mold has high pressure drop. |
Increase overall injection speed
Increase back pressure.
Increase hold pressure.
Try a higher flow grade.
Add gates. |
| Mold function is incorrect. |
In multi-cavity molds, be sure all gate
sizes are uniform to prevent unbalanced
melt flow.
Check part design to make sure there are
no restrictions.
Make sure mold is vented correctly and
vents are clear. |
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