Extrusion & Post
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PLA Lactic Acid Smoke Precipitation
Problem Phenomenon
There is sour-smelling smoke in the PLA extrusion workshop, and white substance condenses on the cooling roll and die head surfaces
Cause Analysis
PLA high-temperature degradation generates lactic acid monomer through intramolecular transesterification, forming lactic acid smoke; lactic acid vapor condenses and precipitates on equipment surfaces, contaminating products and corroding equipment
Solution
①Lower the processing temperature to reduce lactic acid generation; ②Strengthen workshop and die head exhaust; ③Regularly clean the condensate on cooling rolls and die head; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Lactic acid smoke is a visual signal of PLA degradation; cooling, exhaust, and cleaning in a three-pronged approach protect personnel and products; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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