Material Drying
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PLA High-Temperature Processing 50ppm
Problem Phenomenon
PLA products processed at high temperature or with long residence become more severely brittle; the same drying conditions fail
Cause Analysis
When the processing temperature is higher than 240℃ or the residence time is long, the hydrolysis degradation window is wider, and the moisture requirement tightens from 100ppm to below 50ppm to avoid a decrease in number-average molecular weight
Solution
①For high-temperature processes, tighten the drying standard to 50ppm; ②Shorten the melt residence time; ③Re-evaluate the drying capacity for processes exceeding 240℃; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA's moisture red line tightens with temperature; processes above 240℃ must implement 50ppm-level ultra-strict drying; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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