Processing Machinery
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PA66 barrel cleaning temperature
Problem Phenomenon
After PA66 switches to light-colored material, black specks appear for a long time, repeated cleaning ineffective
Cause Analysis
Previous high-temperature material carbonized in barrel dead corners, conventional-temperature cleaning cannot bring it out, carbonized spots keep falling off; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Clean with dedicated purging material at 280℃; stubborn cases: disassemble and clean screw and nozzle; production change plan sorted by color from light to dark; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Dead-corner carbonized material needs mechanical cleaning, production sequencing can also reduce contamination; 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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