Processing Machinery
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PEI Screw Shear Overheating
Problem Phenomenon
Excessive PEI screw speed causes shear overheating, triggering material degradation; the actually measured melt temperature exceeds the standard while the gauge shows normal.
Cause Analysis
PEI screw speed should be controlled at 20~60rpm; excessive speed easily causes shear overheating and triggers degradation; back pressure of 1~5MPa is appropriate, and too high increases melt temperature; deep-flight, low compression ratio (1.5~2.5:1) screws suit high viscosity.
Solution
①Control screw speed at 20~60rpm; ②keep back pressure at a low level of 1~5MPa; ③select a deep-flight, low compression ratio screw; ④verify shear heat with actually measured melt temperature.
Key Takeaway
The 20~60rpm and 1~5MPa back pressure in PEI screw management are quantitative guidance; low-shear configuration protects heat-sensitive materials; actual temperature measurement prevents gauge display distortion.
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