Molds & Tooling
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PEEK Snake Skin Pattern and Flow Marks
Problem Phenomenon
【Problem Phenomenon】Snake-skin-like flow marks and ripples appear on the surface of PEEK products, with uneven gloss
Cause Analysis
Excessive flow speed and poor cavity design make the melt front unstable, forming snake skin patterns; when melt temperature and mold temperature are low, the front frozen film ruptures and produces flow marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Reduce the injection speed and optimize the cavity flow pattern; increase melt temperature and mold temperature to improve front stability; make the runner in the gate area transition smoothly to reduce disturbance; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Snake skin pattern is a front instability signal; steady filling is better than lowering temperature and increasing speed; 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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