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• Sticking in Core - plastic injection troubleshooter
• Description:
At end of cycle, the moulding does not release from the mould but sticks on the core (male mould side).
• Causes:
machine
· injection pressure too high
mould
· core too hot
· core bending
· creation of vacuum - especially on thin-walled parts
material
· (none)
• Actions:
1st
check cycle time: cooling
2nd
decrease injection pressure
3rd
decrease injection hold time
4th
decrease second pressure time
5th
adjust feed for constant cushion
6th
decrease mould-closed time
7th
increase core temperature
8th
decrease cylinder and nozzle temperature
9th
check mould for undercuts and/or insufficient draft
10th
check mould for bending: rule of thumb is 1:5 for core diameter to core length
contact:
jmfalcao@moldplast.com
