- molds and plastics  injection troubleshooter -

• Stringing - plastic injection troubleshooter

• Description:

Stringing is the appearance of a thin plastic string coming from the sprue.

• Causes:

· back pressure too high
· nozzle temperature too high

mould · wrong sprue
material · insufficient melt strength

• Actions:

1st. use suck back: only for crystalline materials
2nd. lower back pressure
3rd. lower or increase nozzle temperature
4th. use different temperature profile
5th do not use sprue breaks

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