Processing Machinery
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LLDPE film haze process optimization
Problem Phenomenon
Attempts to reduce LLDPE film haze through process means have limited effect.
Cause Analysis
Fast cooling can reduce crystallite size and lower haze; but the haze lower limit determined by the LLDPE molecular structure is higher than LDPE.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Strong cold air rapid cooling; ②appropriately lower the frost line; ③raise melt temperature to improve plasticization; ④switch to mLLDPE for demanding occasions.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Process can optimize but hardly breaks through the material limit; transparent applications should directly select metallocene grades.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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