Processing Machinery
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LLDPE film longitudinal tear
Problem Phenomenon
Longitudinal tear strength is low, affecting bag-making use.
Cause Analysis
LLDPE longitudinal tear is sensitive to the draw ratio; an excessive draw ratio actually reduces longitudinal tear.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Optimize the draw ratio to balance bidirectional properties; ②test tear anisotropy; ③adjust the blow-up ratio when necessary; ④verify formulation effects.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE tear properties show obvious anisotropy; bidirectional balance testing is a key point of process verification.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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