Processing Machinery
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PVC Screw Speed
Problem Phenomenon
After increasing the screw speed, degradation spots in PVC products increased
Cause Analysis
Higher speed increases shear heat, raising the actual melt temperature; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Control screw speed at medium-low speed; output is guaranteed by time, not by speed; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PVC screw speed should be low rather than high; 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 problems in the future
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