Extrusion & Post
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LLDPE blown film gel particles
Problem Phenomenon
Gel particles and fish eyes scattered on the film surface; high-end packaging film customers reject.
Cause Analysis
LLDPE plasticization requires stronger mixing shear; unmelted particles, cross-linked gel, and impurities enter the film with the melt forming visible defects.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Use a barrier screw with a mixing section; ②increase screen precision and replace regularly; ③clean die head dead spots; ④strengthen raw material inspection.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE has higher requirements on screw plasticization capability than LDPE; equipment upgrading and enhanced filtration are the core of gel particle control.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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