Processing Machinery
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PMMA Melt Actual Measurement
Problem Phenomenon
The set temperature is the same, but the degree of yellowing differs between batches
Cause Analysis
The actual melt temperature deviates from the set value, and yellowing is sensitive to the actual 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
Regularly measure the melt temperature of air shots; correct the settings with measured values; record the correlation between yellowing and melt temperature; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Yellowing control is based on the measured melt temperature; 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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