Processing Machinery
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PVC Screw Speed
Fenómeno del problema
After increasing the screw speed, degradation spots in PVC products increased
Análisis de la causa
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
Solución
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
Conclusión clave
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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