Molds & Tooling
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Uneven Surface Gloss of PEEK
Problem Phenomenon
The surface gloss of PEEK products is inconsistent, partly bright and partly dull, with obvious differences between different areas of the same shot, and appearance parts are judged unqualified.
Cause Analysis
Uneven cavity surface temperature causes differences in crystallization state, and gloss changes accordingly; inconsistent cavity polishing grades and surface microscopic defects caused by poor venting also manifest as gloss differences.
Solution
①Map the cavity temperature distribution and balance the water channels; ②Unify the cavity polishing grade; ③Improve venting to eliminate surface gas marks; ④Stabilize holding pressure to avoid local over-packing or under-packing.
Key Takeaway
PEEK gloss is a surface mapping of mold temperature uniformity; mold temperature management for appearance parts is more stringent than for structural parts; tracing gloss differences should measure temperature first and then check polishing.
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