Injection Molding
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Cushion Control in PBT '2079851475616104452
Fenómeno do problema
The cushion (melt reserve) at the front end of the barrel is insufficient or unstable.
Análise das causas
The metering stroke is set improperly; the non-return ring is worn and leaks; the back pressure is insufficient and the melt density is low.
Solução
Ensure the cushion amount is 3-6mm; check and replace the non-return ring; appropriately increase the back pressure.
Conclusão principal
The PBT cushion is the reserve of holding pressure.
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