Material Drying
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PLA Anti-rehumidification After Drying
Problem Phenomenon
Properly dried PLA re-absorbs moisture during conveying and in the hopper, and the extruded product performance fluctuates
Cause Analysis
PLA absorbs moisture quickly; dried material exposed to air rapidly re-absorbs moisture; connecting the drying hopper directly to the extruder with nitrogen sealing can control the moisture content increment within 5ppm
Solution
①Connect the drying hopper directly to the extruder to shorten exposure; ②Nitrogen sealing to prevent rehumidification; ③Moisture content increment <5ppm as the acceptance index of the feeding system; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA anti-rehumidification requires accounting for the increment; direct connection plus nitrogen sealing makes the 5ppm increment the design index of the feeding system; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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