Processing Machinery
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PVC First-Piece Temperature Confirmation
Problem Phenomenon
Production started immediately after machine startup, and the first batch of products degraded and turned yellow
Cause Analysis
Temperature was not balanced at startup, and local hot spots were not exposed; 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
Solution
After startup, let the temperature stabilize for 10 minutes; air-shot to check the melt strand; mass production after the first piece passes; 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
Key Takeaway
PVC startup must include temperature balance plus first-piece verification; 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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