Molds & Tooling
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Transparent Low-Crystallinity Surface Layer of PEEK
Problem Phenomenon
[Problem Phenomenon] The core of PEEK products is milky white and highly crystalline while the surface layer is transparent and low-crystallinity, and the surface chemical resistance does not meet the standard
Cause Analysis
At a mold temperature of 150-160℃, the cavity surface is quenched to form a low-crystallinity transparent skin layer, while the core cools slowly and crystallizes fully; the uneven performance between the skin layer and the core affects chemical resistance and wear appearance
Solution
Raise the mold temperature to 180℃ to fully crystallize the surface layer; when the mold temperature cannot be raised, anneal after molding to increase the surface crystallinity; the transparent appearance and performance requirements need to be weighed in advance
Key Takeaway
A transparent surface layer is a signal of low crystallinity — raise the mold temperature or anneal to make up the surface performance; after confirming effectiveness, solidify 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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