Processing Machinery
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LLDPE film haze process optimization
Fenómeno del problema
Attempts to reduce LLDPE film haze through process means have limited effect.
Análisis de la causa
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.
Solución
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.
Conclusión clave
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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