Material Drying
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PPO Drying Temperature Over 150℃ Discoloration
Problem Phenomenon
【Problem Phenomenon】To improve drying efficiency, the baking temperature is raised, and the color of PPO pellets and products changes
Cause Analysis
PPO drying temperature must not exceed 150℃, otherwise the material color changes; high-temperature drying causes thermal oxidative discoloration, natural and light-colored parts are especially sensitive; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Drying temperature is strictly controlled within the grade recommended range and does not exceed 150℃; light-colored parts take the lower temperature limit with extended time; ovens are regularly calibrated for actual temperature; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
150℃ is the discoloration red line for PPO drying; rather extend time than raise temperature; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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