Material Drying
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PLA Drying 0.01% Red Line
Problem Phenomenon
Silver streaks and bubbles appear in PLA products, melt viscosity decreases, products become brittle with insufficient strength
Cause Analysis
PLA is a hygroscopic polyester; residual moisture catalyzes hydrolysis during melt processing, and the molecular weight decreases irreversibly; industrial standards require moisture to be reduced below 100ppm before processing, and conventional drying to below 250ppm (0.025%)
Solution
①Dehumidifying drying to a moisture content target of <0.01% (100ppm), release at <0.025%; ②Drying air dew point ≤-40℃, air volume >0.03m³/h per kg/h; ③Actual measurement verification with a moisture meter
Key Takeaway
100ppm is the golden red line for PLA processing; hydrolytic viscosity reduction is irreversible, and drying must be quantified to the ppm level rather than based on experience; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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