Molding Process
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High Haze of LDPE Film
Problembeschreibung
LDPE film has poor transparency and is hazy.
Ursachenanalyse
Internal haze comes from large crystallite size, external haze comes from surface roughness (melt fracture/uneven cooling); low melt temperature and slow air ring cooling both increase haze.
Lösung
①Raise melt temperature; ②air ring quenching to reduce surface crystallization; ③avoid melt fracture (raise die temperature); ④select high-transparency grades.
Wichtigste Erkenntnis
Haze is divided into internal and external: adjust crystallization internally and surface externally.
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