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Cracking, Crazing

Cracking, Crazing
Possible Cause Suggested Remedy
Packing excessive material into the mould a. Decrease packing pressure
b. Decrease shot size
c. Increase transfer position (to lower injection peak pressure)
d. Decrease injection time
Non-uniform or too cold a mould temperature a. Increase mould temperature
b. Supply uniform cooling to the cavity
Knockout system poorly designed Redesign knockout system for balanced ejection forces
Inadequate draft angles or excessive undercuts Rework mould