Molds & Tooling
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PEEK Tiger Stripe Pattern and Pulsating Flow
Problem Phenomenon
【Problem Phenomenon】Tiger stripe patterns with alternating light and dark appear on the surface of PEEK products, distributed periodically
Cause Analysis
Pulsating melt flow causes alternating light and dark gloss: low melt temperature and mold temperature or too small a gate makes filling advance intermittently; plasticizing feed pulsation is also an inducement; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Increase melt temperature and mold temperature to improve flow continuity; enlarge the gate size; check plasticizing stability and back pressure setting to eliminate feed pulsation; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Tiger stripes originate from pulsating flow; raising temperature and enlarging the gate restore continuous filling; 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 in the future
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