This paper presents a simplified drainage model applicable to twin wire and top wire formers. The design model presented here is predicated on twin wire models previously published in the literature. The model is applicable to formers that employ multi-blade and counter-blade dewatering elements. The model predicts wire deflections, pressure pulses, mat thicknesses and dewatering rates. One unique feature of this design model is that it includes variable fiber mat resistance coefficients.
Results are presented for three design configurations of blades used industrially on twin wire formers. The pressure pulses and drainage rates predicted by the model compare favorably with previously published work. The inclusion of counter-blades in the design of top wire units increases the magnitude of the pressure pulse emanating from the blades. The model also suggests that as the fibrous mat builds on the wire, the magnitude of the pressure pulse in the vicinity of the blades increase and this increase can lead to mat disruption.
Product code: spg03131Author: Wildfong, V., Genco, J.
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