Processing Machinery
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PVC Burnt
Fenómeno do problema
Brown burnt marks at corners of PVC products
Análise das causas
Adiabatic compression of trapped gas causes local overheating, and PVC's low degradation temperature makes it more prone to burning; 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
Open vents of 0.01-0.02mm at the burnt position; reduce final-stage speed; recheck temperature; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
For PVC burnt, venting and cooling are applied together; 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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