Molds & Tooling
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Poor EVOH Surface Gloss
Problem Phenomenon
EVOH product surface gloss <60%, below the 80% requirement, dull appearance
Cause Analysis
Mold surface rough Ra>0.4μm; EVOH crystallinity high, surface microcrystals scatter light; cooling rate improper
Solution
1) Polish mold to Ra<0.1μm mirror finish; 2) Increase mold temperature to delay crystallization and reduce scattering; 3) Add nucleating agent to control crystal size
Key Takeaway
Poor gloss is caused by mold roughness and crystalline scattering; polishing mold and controlling crystallization are key
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