Extrusion & Post
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PBAT uneven thickness
Problem Phenomenon
The transverse and longitudinal thickness deviation of PBAT film is large, affecting use performance and cost, causing disputes when customers price by weight.
Cause Analysis
Uneven die gap; uneven air ring cooling; extrusion output fluctuation; film bubble eccentricity; unstable haul-off speed; low PBAT melt strength amplifies process fluctuations.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Adjust die gap uniformity; ②homogenize air ring air volume; ③stabilize extrusion pressure and temperature; ④correct film bubble centering; ⑤stably control haul-off speed.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Die and air ring are the equipment-related main causes of PBAT uneven thickness; low melt strength makes the process window narrower; automatic thickness measurement feedback is a modern means.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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