Material Drying
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PLA Drying Temperature 80-90℃
Problem Phenomenon
After the drying temperature is too high, PLA pellets stick and agglomerate, blocking the drying tower discharge port
Cause Analysis
PLA glass transition temperature is about 60℃; amorphous pellets soften and stick at the drying temperature; the drying temperature of amorphous PLA must not exceed 45-50℃, and 80-90℃ can only be used after pre-crystallization
Solution
①Amorphous PLA drying temperature ≤45℃; ②After pre-crystallization, 80-90℃×4 hours; ③Crystallization equipment equipped with anti-sticking; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA drying temperature depends on the crystallization state; low-temperature pre-crystallization before crystallization is the iron rule to prevent sticking and tower blockage; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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