Injection Molding
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PCABS holding pressure ratio setting
Problem Phenomenon
【Problem Phenomenon】PC/ABS holding pressure improper, sink marks and internal stress problems alternate
Cause Analysis
Holding pressure is 50-70% of injection pressure: compensates 0.5-0.7% shrinkage to prevent sink marks; excessive holding pressure introduces internal stress, especially sensitive in the PC phase; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Set holding pressure at 50-70%; extend time in thick-wall areas; reduce holding pressure for internal stress parts with annealing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC/ABS holding pressure 50-70%, balancing sink marks and stress at both ends; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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