Processing Machinery
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ASA screw speed too high overheating
Problem Phenomenon
When ASA is produced at high screw speed, the measured melt temperature exceeds the standard, the product shows signs of degradation, the displayed temperature is normal but the melt temperature is out of control.
Cause Analysis
Although ASA can withstand medium-high screw speeds and high shear (Plastribution), shear heat generated by excessive speed makes the actual melt temperature exceed the set value; the displayed temperature cannot reflect shear heat generation.
Solution
①Debug the upper limit within the medium-high screw speed range; ②use measured melt temperature as the basis for speed setting; ③coordinate with low back pressure to reduce shear heat superposition; ④immediately reduce speed for verification when melt temperature exceeds the standard.
Key Takeaway
ASA's shear tolerance must be verified with measured melt temperature; melt temperature out of control with normal display is a hidden risk; the combination of low back pressure and high speed is safer.
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