Processing Machinery
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PLA thermal degradation yellowing
Problem Phenomenon
Products yellow and become brittle, with reduced performance.
Cause Analysis
PLA has low thermal stability; excessive processing temperature or excessive residence time triggers thermal degradation; compared with traditional plastics, PLA begins to degrade at lower temperatures.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Control melt temperature at the lower limit of the 170~200℃ window; ② shorten barrel residence time; ③ lower screw speed to reduce shear heat; ④ avoid long-time shutdown with heat preservation.
Key Takeaway
PLA's thermal degradation threshold is lower than conventional plastics; low temperature and short time are the basic principles of its processing.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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