Processing Machinery
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PVC Flow Mark
Fenómeno do problema
Wavy flow marks on PVC product surface
Análise das causas
The melt front cools quickly and flows unstably, and PVC's high viscosity aggravates flow marks; 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
Solução
Increase melt temperature and speed; appropriately raise mold temperature; improve gate position; 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
Conclusão principal
Flow marks are improved by raising both temperature and speed; 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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