Injection Molding
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PC holding pressure and sink mark stress
Problem Phenomenon
【Problem Phenomenon】PC holding pressure improper, sink marks and internal stress problems alternate
Cause Analysis
PC shrinkage rate 0.5-0.7% is small but holding pressure shrinkage compensation is still needed; holding pressure is 40-60% of injection; excessive holding pressure introduces internal stress, especially PC is sensitive
Solution
Holding pressure set at 40-60%; thick-wall rib positions delayed; internal stress parts lower holding pressure with annealing；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC holding pressure 40-60%, balancing sink marks and stress at both ends；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence；Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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