Extrusion & Post
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LLDPE blown film bubble breakage
Problembeschreibung
Bubble breakage is frequent after increasing output or increasing the LLDPE proportion.
Ursachenanalyse
LLDPE melt strength is insufficient to withstand high stretching; when the blow-up ratio and draw ratio are too large, the bubble is pulled apart.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Lösung
①Blend in LDPE to increase melt strength; ②reduce the blow-up ratio and draw ratio; ③control extrusion output; ④stabilize cooling.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Wichtigste Erkenntnis
Bubble breakage is the main constraint on increasing the LLDPE proportion; blending modification balances performance and stability better than reducing output.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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