Material Drying
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Cloudy marks on the surface of PET injection molded parts
Fenómeno do problema
Cloudy white spots or blurry areas appear on the surface of PET products, especially in transparent products.
Análise das causas
The mold surface has oil stains or release agent residues; moisture in the melt is not completely removed; excessive injection speed introduces air.
Solução
Clean the mold surface to remove oil stains; strengthen drying (dew point ≤-40°C); reduce injection speed and improve venting; select low-volatility additives.
Conclusão principal
PET surface cloudy marks originate from contaminants, moisture or additive migration.
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