Processing Machinery
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PMMA Barrel Residual Material
Problem Phenomenon
After PMMA shutdown, the first shots after restarting always have degradation spots
Cause Analysis
Residual material retained in the barrel during shutdown oxidizes and degrades, and mixes into products at restart; 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
Empty the barrel before shutdown; after restarting, make air shots until the extrudate is normal; clean after long-term shutdown; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Barrel emptying at shutdown is a standard action to prevent degradation spots; 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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