Molds & Tooling
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Excessive PPO Holding Pressure and Cooling Time
Fenómeno del problema
After conventionally extending holding pressure and cooling for PPO thick-walled parts, internal stress increases and demolding becomes difficult, and cycle efficiency is low.
Análisis de la causa
PPO process characteristics require that holding pressure and cooling time cannot be too long; amorphous materials freeze quickly, and excessively long holding pressure has no feeding benefit and only increases stress; excessive cooling lengthens the cycle and wastes capacity.
Solución
①Limit holding pressure time to gate freezing; ②minimize cooling time according to demolding rigidity requirements; ③high-pressure high-speed injection combined with short holding pressure; ④verify dimensional stability through cycle optimization.
Conclusión clave
The short holding pressure and short cooling process orientation of PPO is opposite to that of crystalline materials; understanding the freezing characteristics of amorphous materials is key; cycle optimization cannot come at the expense of quality.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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