Material Drying
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PMMA Drying Temperature Window
Problem Phenomenon
PMMA pellets yellow after drying at 110℃, and light transmittance of injection molded lenses decreases
Cause Analysis
PMMA dried for a long time above 100℃ undergoes thermal-oxidative aging and yellowing, and the light transmittance of optical parts is directly damaged; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
PMMA drying controlled at 70-90℃ for 4-8 hours; optical grade takes the 70-80℃ low-temperature long-time route; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
PMMA drying should be low temperature and long time, and optical grade especially must control the upper limit; 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 similar future problems.
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