Processing Machinery
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PA6 Barrel Purging Temperature
Problem Phenomenon
After PA6 production ends, the next material is directly used to push out the residue, and black specks persist for a long time after material change
Cause Analysis
PA6 melt temperature is high, and residual material carbonizes in the dead corners of the barrel; directly pushing out with new material has low purging efficiency, and carbonized spots fall off one after another forming black specks; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Before shutdown, purge the barrel with purging compound or HDPE at 260°C to completely expel the PA6 residue; purge and cool down before long-term shutdown; disassemble and clean the screw and nozzle to remove accumulated material in dead corners
Key Takeaway
High-temperature material shutdown purging must be thorough, and carbonized material in dead corners is the main source of black specks; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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