Apparatus for screening paper fiber stock
AssigneeThe Black Clawson Company
InventorDonald F. Lehman
Life of this patent
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Abstract
In screening apparatus for paper making fiber incorporating a cylindrical screen member provided with screening perforations which are either cylindrical or slotted in section, the perforations are characterized by greater flow area on the inlet side of the cylinder than on the accepts side of the cylinder. More specifically, each of the screening perforations includes a generally funnel-shaped portion on the inlet side of the cylinder which leads to a short parallel sided portion on the accepts side of the cylinder.
Claims6
Screening apparatus for paper making stock comprising, a pressure housing, a cylindrical screening member dividing the interior of said housing into an inlet chamber and an accepts chamber and having multiple screening perforations therethrough, and a rotor mounted for rotation in said housing and including vane means for preventing plugging of said perforations, and further characterized by the fact that said perforations are of greater flow area on the surface of said screening member facing said inlet chamber than on the accepts side of said screening member.
Dependencies are inferred from the claim text.