Injection Molding
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PA12 Injection Pressure and Holding Pressure Strategy
Fenómeno del problema
【Problem phenomenon】PA12 products alternately showed large stress from over-holding and sink marks from insufficient compensation
Análisis de la causa
PA12 injection pressure can be used up to 100MPa, but low holding pressure combined with high melt temperature is recommended; high holding pressure introduces internal stress, while the crystallization volume shrinkage of semi-crystalline materials must be compensated
Solución
Set injection pressure according to flow needs with an upper limit of 100MPa; adopt a low-value long-time strategy for holding pressure; make the runner and gate dimensions large enough to compensate for crystallization shrinkage; perform stress testing on internal-stress parts
Conclusión clave
PA12 requires high-pressure filling and low holding pressure compensation, and the runner and gate must be large enough to compensate for crystallization shrinkage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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