Molds & Tooling
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Poor PVA surface gloss
Fenómeno do problema
PVA product surface gloss <60%, below the 80% requirement, dull appearance
Análise das causas
Mold surface rough Ra>0.4μm; high PVA crystallinity, surface microcrystals scatter light; improper cooling rate
Solução
1) Polish mold to Ra<0.1μm mirror finish; 2) Raise mold temperature to delay crystallization and reduce scattering; 3) Add nucleating agent to control crystal size
Conclusão principal
Poor gloss is caused by mold roughness and crystallization scattering; polishing the mold and controlling crystallization are the key
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