(57) Apparatus for pulping paper making stock at high consistencies, e.g. 10 percent to
25 percent solids, includes a tub having a cylindrical wall (10) and a rotor (20)
constructed and arranged to apply primarily pumping force to the stock which causes
it to travel outwardly to and upwardly along the tub wall (10). This climbing stock
is continuously subdivided and directed back into the tub, and a feed screw (40) extending
vertically upward from the rotor (20) assures continuous circulation which develops
zones of intense hydraulic sheer constituting the major force for effecting the desired
defiber- . ing.
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