Injection Molding
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LCP Screw Wear and Check Ring Leakage
Problem Phenomenon
【Problem Phenomenon】After long-term use of glass-fiber-filled LCP, metering is unstable and product weight fluctuates; inspection shows wear of the screw and check ring, and melt backflow during injection
Cause Analysis
High-glass-fiber-content LCP strongly wears the screw and barrel; after wear, the check ring seal fails, and during injection and holding stages the melt flows back through the gap, causing the actual shot volume to fluctuate; the Celanese troubleshooting chapter lists a special section on check ring leakage
Solution
Regularly measure the gap between the screw and the check ring, and replace with wear-resistant bimetallic parts as soon as it is out of tolerance; when metering is unstable, first do a backflow test; select wear-resistant coated screws for high-filled grades
Key Takeaway
Glass-fiber LCP is highly abrasive; check ring leakage can disguise itself as process fluctuation and must be regularly checked; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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