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Mark A. Spalding, Joseph Dooley, and Kun Sup Hyun
Dow Plastics
The Dow Chemical Company
Midland, MI, 48667
The size of flight radii on the screw channel is important for the proper performance of a single-screw extruder. SPI guidelines state that the root radii should not be less than half the depth of the channel. Improper design or fabrication, however, often results in radii that are less than half that for the metering and transition sections, leading to regions with long residence time and material degradation. For optimal solids conveying, however, the effect of flight radii is considerably more complicated. This paper will present experimental and numerical data that indicate how to specify the flight radii for all sections of the screw.
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Effects of Light Radii Size on the Performance of Single Screw Extruders, 1999 Polymers, Laminations
