Extrusion & Post
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PBAT film bubble swaying
Problem Phenomenon
The PBAT blown film bubble sways left and right or rotates, increasing the risk of thickness unevenness and broken holes.
Cause Analysis
Uneven air output from the air ring; imbalance of internal and external pressure of the film bubble; ambient temperature and airflow interference; haul-off rollers not parallel; low PBAT melt strength and weak anti-disturbance ability.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Homogenize and seal the air ring air volume; ②optimize the film bubble internal cooling system; ③protect the production environment from wind; ④correct haul-off roller parallelism; ⑤configure a film bubble stabilization cage.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Air ring uniformity is the foundation of PBAT film bubble stability; ambient airflow is often overlooked; the stabilization cage is a low-cost and effective device.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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