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