Extrusion & Post
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LLDPE film stretch wrap film
Fenómeno do problema
Stretch wrap film stretch ratio and retractive force are unstable.
Análise das causas
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.
Solução
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.
Conclusão principal
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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