Molds & Tooling
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Product has sink marks, unstable dimensions, or flash
Fenómeno del problema
The product has sink marks, unstable dimensions, or flash, related to the holding pressure setting
Análisis de la causa
Holding pressure insufficient, producing sink marks
Holding pressure time too short, insufficient shrinkage compensation
Holding pressure too long, stress concentration at the gate area
Holding pressure switchover too early, dimension fluctuation
Holding pressure too high, flash
Solución
Increase holding pressure to 80-120MPa
Holding pressure time 15-30s, according to gate freezing time
Reasonably set the holding pressure switchover point
Avoid excessive holding pressure producing flash
Adjust holding pressure according to the cellulose acetate butyrate shrinkage rate 0.4-0.6%
Conclusión clave
Holding pressure needs to be set according to shrinkage rate and gate freezing time
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