Rotating disc wood chip refiner

Details Rotating disc wood chip refiner Rotating disc wood chip refiner

D - Textiles, Paper

21

D

92/43

D21D 1/00 (2006.01) D21D 1/30 (2006.01)

Patent

CA 1207572

ABSTRACT An improved rotating disc wood chip refiner would provide the required pulsating cavitation regime , but would use less than 50% of the energy consumed by usual rotating disc wood chip refiners with square, sharp-edged radial bar/slot profiles, due to 3 minimum energy conditions. First, a resonating cavity model of wood refining is tuned for least energy and agrees with Atack's classic obser- vations of wood fibers (1). Second, a low fluid-dynamic drag radial bar profile would require less than 50% of the usual square bar-drag energy, see Hoerner (2). Third, a pressure recovery radial slot profile would require less than 50% of the usual square slot drag energy, see Adkins(3). References 1. D.N.Atack and W.D.May, Fracture of Wood, Pulp and Paper Mag Canada, 64C, T75-83, 119, 1963. 2. S.F.Hoerner, Fluid Dynamic Drag, New Jersey, 1965. 3. R.C.Adkins et al, The Hybrid Diffusser, ASME Jour.Eng. Power Vol. 103, Jan. 1981.

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