Injection Molding
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PCL holding pressure and sink marks
Problem Phenomenon
PCL '2079851475616104452 holding pressure is improper, causing sink marks or internal stress, and thick-walled parts are difficult to manage.
Cause Analysis
PCL holding pressure balances shrinkage compensation and stress; holding pressure demand of thick-walled parts; time-pressure curve; gate freezing; shrinkage characteristics.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Holding pressure and time optimization; ②Special management of thick-walled parts; ③Gate design; ④Balance of sink marks and stress.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PCL holding pressure management is a balance of quality and stress; thick-walled parts are a challenge; curve optimization is based on testing.；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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