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Nozzle Drooling

Bubbles, Voids
Possible Cause Suggested Remedy
Nozzle temperature too hot a. Reduce nozzle temperature
b. Decrease melt temperature
c. Reduce back pressure
d. Increase screw decompression
e. Use enough screw RPM’s to allow screw to recover using approximately 90% of the cooling time
Wrong nozzle design Use reverse taper nozzle
Moisture in material a. Review material handling to eliminate moisture pick up
b. Dry material prior to moulding
c. Use hopper dryers