Processing Machinery
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POM black speck outbreak at startup after shutdown
Problem Phenomenon
After several hours of shutdown and restart, black specks appear concentrated in the first few dozen shots, then gradually decrease.
Cause Analysis
During shutdown, POM retained in the barrel degrades and carbonizes, and after startup the carbide is discharged successively with the melt; the longer the shutdown and the higher the heat preservation, the more severe the carbonization.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Replace the POM in the barrel with cleaning compound before shutdown; ②lower the barrel heat preservation temperature during shutdown; ③scrap the first few shots after startup; ④shorten unnecessary shutdowns.
Key Takeaway
Shutdown management is the key link in POM black speck control; standardized operation of cleaning before shutdown and lowering heat preservation can avoid batch scrapping at each startup.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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