Material Drying
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PLA Shutdown Handling
Problem Phenomenon
After shutdown PLA degrades in the barrel, and products embrittle and discolor at restart
Cause Analysis
PLA retained material during shutdown undergoes hydrolysis and thermal degradation in parallel at the residual temperature; degraded material contaminates products at restart; long shutdown should replace the barrel; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Replace the barrel with PE or PP before a long shutdown; ②Discharge the first few shots at restart; ③Evaluate replacement for shutdown over 30 minutes; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA shutdown handling follows the same rules as polyester; PE/PP replacement is the standard action to prevent degradation contamination; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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