Material Drying
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PLA Pre-crystallization Anti-sticking
Problem Phenomenon
PLA pellets agglomerate after heating in the drying tower, forcing the production line to shut down for cleaning
Cause Analysis
Amorphous PLA softens and sticks above the glass transition temperature; the pre-crystallization process at 78±2℃×45-60 minutes induces a crystallinity of 30-35%, and only after raising the softening point can it withstand the drying temperature
Solution
①Pre-crystallization at 78±2℃×45-60 minutes, low-speed stirring to prevent sticking; ②Stepped heating 65℃→78℃→70℃ matching the crystallization exotherm curve; ③After the crystallinity reaches 30-35%, transfer to drying
Key Takeaway
Pre-crystallization is the pre-process of PLA drying; the 78℃ stepped heating method saves 22% energy compared with the constant temperature method and prevents sticking; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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