Processing Machinery
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LLDPE film transparency limitation
Problem Phenomenon
LLDPE film haze is higher than LDPE film; transparent packaging is limited.
Cause Analysis
The regularity of the LLDPE molecular structure makes its crystalline morphology different from LDPE, so the inherent haze is high; process can partially improve it but hardly reach the LDPE level.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Optimize cooling with fast cooling to suppress crystallization; ②appropriately raise melt temperature to improve plasticization; ③evaluate mLLDPE or blending for high-transparency needs; ④manage customer expectations.
Key Takeaway
LLDPE transparency is limited by the material's nature; mLLDPE is an upgrade option balancing strength and transparency.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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