Processing Machinery
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PCABS screw speed and shear
Problem Phenomenon
【Problem Phenomenon】PC/ABS screw high-speed shear generates heat, melt discolors and loses strength
Cause Analysis
Medium-low screw speed is appropriate: high-speed shear heat degrades the PC phase; back pressure 5-15MPa to ensure uniform plasticization is enough, too high accumulates shear heat; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Control screw speed at medium-low; back pressure 5-15MPa; for discoloration, first check speed and back pressure; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC/ABS screw medium-low speed with appropriate back pressure, shear heat is an invisible killer; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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