Extrusion & Post
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LLDPE film stretch wrap film
Problem Phenomenon
Stretch wrap film stretch ratio and retractive force are unstable.
Cause Analysis
Stretch wrap film has high requirements for extensional rheological properties; the tackifier in the formulation and the LLDPE grade selection affect performance.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Select a stretch wrap film dedicated grade; ②optimize the tackifier system; ③stabilize the stretching process; ④test stretch retraction performance.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Stretch wrap film is a high-value-added application of LLDPE; a dedicated formulation is the performance foundation.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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