Molding Process
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High Haze of LDPE Film
Problem Phenomenon
LDPE film has poor transparency and is hazy.
Cause Analysis
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.
Solution
①Raise melt temperature; ②air ring quenching to reduce surface crystallization; ③avoid melt fracture (raise die temperature); ④select high-transparency grades.
Key Takeaway
Haze is divided into internal and external: adjust crystallization internally and surface externally.
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