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AssigneeThe Black Clawson Company
InventorJoseph W. Couture
Estimating the term…
Pulping apparatus for pulping high consistency paper pulp includes a tub having a bottom wall and a generally cylindrical side wall extending upwardly therefrom, and a rotor mounted centrally of the bottom wall for rotation about a vertical axis and having a hub portion, a plurality of vanes extending generally radially outwardly from the hub and having pumping and defibering faces thereon, and a plurality of helical screw flights extending upwardly from the hub. Each flight has a concave undersurface such that rotation of the rotor in the presence of high consistency pulp causes the screw flights to draw pulp inwardly toward the axis of rotation and push it downwardly to the defibering faces of the vanes, and the outer surface of each flight being convexly curved and of substantially greater surface are than its undersurface to provide an air foil effect further tending to draw pulp into the path of the undersurface of the following flight. The screw flights preferably include trailing portions having raised peripheral ridges extending upwardly therefrom to prevent stock from flowing outwardly from the rotor until it reaches the vicinity of the vanes. The trailing portions of the screw flights preferably have a width, measured in a radial direction, which is substantially the same as the length of the vanes such that pulp can be pushed downwardly and outwardly into the entire path of the working faces of the vanes.
Apparatus for pulping high consistency paper pulp comprising:
In apparatus for pulping high consistency paper pulp of the type including a tub with a generally horizontal bottom wall and a side wall of generally cylindrical section extending upwardly from said bottom wall and forming a pulping chamber therewith, the combination of:
Dependencies are inferred from the claim text.