Molds & Tooling
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Improper Application of Vacuum Venting for PEEK
Problem Phenomenon
After the PEEK mold is equipped with vacuum venting, melt is sucked into the venting channels and blocks them, or improper vacuum timing instead entrains air — the defect is not eliminated and new failures are added.
Cause Analysis
When the vacuum venting start timing does not match the filling phase, the vacuum is not established before the melt front arrives or is not closed in time after the melt arrives; improperly designed venting channel dimensions are easily invaded by melt.
Solution
①Set the vacuum start-stop timing according to the filling phase; ②Use labyrinth or valve structures for venting channels to prevent melt intrusion; ③Adjust the vacuum degree in stages rather than the bigger the better; ④Regularly clean the venting channels.
Key Takeaway
Vacuum venting is an effective means for PEEK trapped-air treatment but requires fine control; timing and channel design determine success or failure; simple add-on installation does not equal correct use.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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