Extrusion & Post
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LLDPE film tensile strength advantage realization
Problem Phenomenon
Film strength does not meet expectations, failing to reflect LLDPE's tensile strength advantage.
Cause Analysis
LLDPE molecular chain orientation requires a suitable stretching process; improper blow-up ratio and draw ratio leave the strength potential unrealized.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Optimize the blow-up ratio and draw ratio combination; ②appropriately reduce the die gap to enhance orientation; ③control cooling and setting; ④test bidirectional strength for verification.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE's strength advantage must be activated by the process; orientation management is the key to realizing performance.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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