Processing Machinery
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PMMA Melt Temperature Too Low
Problem Phenomenon
PMMA melt temperature set at 190℃, products have severe flow marks and are brittle
Cause Analysis
Too-low temperature gives high melt viscosity and high filling shear stress, and products have large internal stress and surface flow marks; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
Raise melt temperature to 210-240℃; thin-wall long-flow parts take the upper limit; combine with mold temperature increase; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The PMMA temperature lower limit ensures plasticization and flow, and too low is equally harmful; 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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