- molds and plastics  injection troubleshooter -



• Record Grooves - plastic injection troubleshooter


• Description:

Resembles the grooves of gramophone records. At slow speed - as material nears cold tool - it loses its flow (below HDT) before actual contact. The melt that follows flows over cooled melt, though repeat the cycle.


• Causes:
machine · injection speed too low
· injection pressure too low
mould · mould too cold
· different texture on mould halves - polished vs coarse grain
material · melt too cold


• Actions:

1st. increase injection speed
2nd. increase injection pressure
3rd. increase melt temperature
4th. increase mould temperature
5th check mould textures


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