Extrusion & Post
1 views
LLDPE blown film bubble breakage
Problem Phenomenon
Bubble breakage is frequent after increasing output or increasing the LLDPE proportion.
Cause Analysis
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.
Solution
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.
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!