Extrusion & Post
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LLDPE blown film bubble breakage
Fenómeno do problema
Bubble breakage is frequent after increasing output or increasing the LLDPE proportion.
Análise das causas
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.
Solução
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.
Conclusão principal
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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