Processing Machinery
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PVC Shutdown Handling
Problem Phenomenon
After weekend shutdown, Monday startup first few shots batch discoloration, cleaning takes half a day
Cause Analysis
During shutdown, residual PVC in barrel continuously degrades; at restart degraded material contaminates first batch; long shutdown must replace barrel to prevent residual decomposition; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Replace barrel with PE/PP before shutdown; ②Empty first few shots at restart; ③Long shutdown cool barrel and replace; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVC shutdown procedure same principle as POM; replacement and emptying is standard action, omitting it means batch accident; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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