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