Processing Machinery
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PA66 barrel temperature zoning
Problem Phenomenon
PA66 poor plasticizing entrains unmelted particles, local product strength low
Cause Analysis
Barrel temperature gradient set unreasonably; when compression zone temperature is insufficient, material not fully molten enters the metering zone, screw shear insufficient to remedy; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Barrel gradient set as rear 260℃, middle 275℃, front 285℃; back pressure 0.5-1.0MPa to strengthen plasticizing; regularly check screw wear
Key Takeaway
Reasonable temperature gradient plus appropriate back pressure is the guarantee of PA66 plasticizing quality; 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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