Apparatus for pulping paper making stock at high consistencies
AssigneeThe Black Clawson Company
InventorsEarl T. Blakley, Paul G. Marsh
Life of this patent
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Abstract
Apparatus for pulping paper making stock at high consistencies, e.g. 10 percent to 25 percent solids, includes a cylindrical tub and a rotor constructed and arranged to apply primarily pumping force to the stock which causes it to travel outwardly to and upwardly along the tub wall. This climbing stock is continuously subdivided and directed back into the tub, and a feed screw extending vertically upward from the rotor assures continuous circulation which develops zones of intense hydraulic sheer constituting the major force for effecting the desired defibering.
Claims10
Pulping apparatus for defibering paper making stock at high consistencies, comprising:
- (a) a tub having an upwardly extending cylindrical wall and open at the top thereof to receive stock to be defibered,
- (b) a rotor mounted for rotation on a vertical axis in the center of the bottom of said tub,
- (c) drive means constructed to rotate said rotor only in a single predetermined direction,
- (d) said rotor including vanes each having a single working surface facing in said direction of rotation for responding to rotation of said rotor by impelling high consistency pulp stock within said tub toward said tub wall with sufficient force to climb said wall,
- (e) baffle means on said wall positioned to redirect said climbing stock back toward the center of said tub,
- (f) feed screw means mounted on said rotor for rotation therewith in said direction and including flight means responsive to said rotation to force stock downwardly for impact by said vanes, and
- (g) valve means in the bottom of said tub for dumping the contents of said tub.
Dependencies are inferred from the claim text.