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Design and operation of screen packs
Author(s) -
Carley James F.,
Smith Wayne C.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760180513
Subject(s) - pressure drop , materials science , body orifice , extrusion , rheometer , volumetric flow rate , mechanics , range (aeronautics) , orifice plate , flow (mathematics) , ranging , mechanical engineering , engineering drawing , computer science , composite material , engineering , rheology , physics , telecommunications
A method is presented for calculating the pressure drop in a polymer melt flowing through single or packed screens from orifice‐rheometer data, screen dimensions and flow rate. A design plot encompassing standard square‐woven and twilled‐dutch screens greatly simplifies the calculation. The design relationships are based on the assumption that, for the narrow range of shear usually encountered in a screen pack, the flow behavior is adequately represented by the power law. These relationships were developed from theoretical arguments and wide‐ranging experimental evidence reported elsewhere (1). Several examples involving screen packs in extrusion service are worked out in detail, The quantitative implications of the screen‐pack equations for extruder scale‐up are discussed.