Processing Machinery
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PVC Black Specks
Problem Phenomenon
Black specks appear on light-colored PVC products
Cause Analysis
Carbonized material at dead spots falls off, or material change cleaning is not thorough; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry materials, and it should be confirmed first during troubleshooting
Solution
Disassemble and clean to remove dead spots; material change cleaning procedure; black speck trend monitoring; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
Black specks are eradicated by disassembly cleaning and procedures; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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