Processing Machinery
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PVDF Shutdown and Cleaning Procedure
Problem Phenomenon
【Problem Phenomenon】After PVDF shutdown and restart, black speck carbonized material appears, and cleaning is not thorough with repeated contamination
Cause Analysis
During shutdown, residual material in the barrel continues to be heated, degraded and carbonized, and flakes off to contaminate upon restart; the risk is doubled for flame-retardant material and high-temperature shutdown; Arkema requires emptying before shutdown and standardized cleaning
Solution
Empty the barrel before shutdown and clean with non-flame-retardant material or HDPE; for long shutdowns, reduce temperature and keep warm rather than standby at high temperature; increase inspection intensity for the first batch after startup; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Shutdown emptying plus standardized cleaning is the iron rule for preventing black specks, and high-temperature standby is a major taboo; 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 subsequent similar problems
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