Processing Machinery
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PVC Startup Procedure
Problem Phenomenon
Startup after several days shutdown, first batch products dense yellow spots and black specks
Cause Analysis
Residual material in barrel stays and degrades, directly mixed into products at startup; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Empty barrel before startup and replace with purging material; mass production after first piece qualified; long shutdown thorough cleaning; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC startup first discharges residual material, first piece must be inspected; 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 later
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