Material Drying
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Undried PLA Runs Better Instead
Problem Phenomenon
Undried PLA '2079851475616104452 fills completely instead, but after drying it cannot fill, and operators are confused
Cause Analysis
Hydrolytic viscosity reduction of undried PLA improves flowability and reduces pressure drop, so filling is complete instead, but the products show dark halo degradation signs; dried material has high viscosity and large pressure drop, requiring process adjustment to compensate
Solution
①Do not judge drying qualification by filling ease; ②After drying, increase temperature or pressure to compensate for viscosity; ③A dark halo is a degradation alarm, immediately stop using this batch of material; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The undried illusion of PLA is a classic trap; improved flowability precisely indicates that the molecular weight has been destroyed by hydrolysis; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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