Injection Molding
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Cushion Control in PBT '2079851475616104452
Fenómeno del problema
The cushion (melt reserve) at the front end of the barrel is insufficient or unstable.
Análisis de la causa
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.
Solución
Ensure the cushion amount is 3-6mm; check and replace the non-return ring; appropriately increase the back pressure.
Conclusión clave
The PBT cushion is the reserve of holding pressure.
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