Molds & Tooling
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PMMA First Article Temperature Confirmation
Problem Phenomenon
Production starts immediately after machine startup, and the first batch of lenses exceeds optical distortion limits
Cause Analysis
At startup, mold temperature and material temperature are not balanced, and optical surfaces are extremely sensitive to temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Wait 15 minutes after startup for temperatures to stabilize; measured melt temperature and mold temperature must reach the standard; mass production after first article optical inspection; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Optical part startup must include temperature balancing plus first article optical verification; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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