Molds & Tooling
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EVA surface gloss is poor
Problem Phenomenon
EVA product surface gloss <60%, below the 80% requirement, with dull appearance
Cause Analysis
Rough mold surface Ra>0.4μm; high EVA crystallinity with surface microcrystals scattering light; improper cooling rate
Solution
1) Polish the 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 rough mold and crystalline scattering; polishing the mold and controlling crystallization are key
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