Extrusion & Post
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PBAT melt index too low and processing difficult
Problem Phenomenon
PBAT melt flow index is too low, plasticization is difficult, extrusion pressure is high, and output is limited.
Cause Analysis
PBAT molecular weight too high or crosslinked; plasticization temperature insufficient; screw shear insufficient; filler addition too high; lubricant insufficient.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Increase plasticization temperature; ②optimize screw shear; ③add lubricant to improve flow; ④control filler addition; ⑤evaluate grade change.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Temperature and shear adjustment are the main means for PBAT melt index too low; lubricant is auxiliary; grade selection is fundamental.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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