Injection Molding
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PA12 Injection Pressure and Holding Pressure Strategy
Problem Phenomenon
【Problem phenomenon】PA12 products alternately showed large stress from over-holding and sink marks from insufficient compensation
Cause Analysis
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
Solution
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
Key Takeaway
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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