Back to results
US 5,591,336 AGranted
Apparatus for dewatering and or washing papermaking stock
AssigneeThe Black Clawson Company
InventorsPeter Seifert, David E. Chupka, Terry L. Bliss
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeThe Black Clawson Company
InventorsPeter Seifert, David E. Chupka, Terry L. Bliss
Estimating the term…
Improved apparatus for dewatering or washing a suspension of paper pulp in which first and second rolls are rotatably mounted with an endless loop of wire tensioned around the rolls, and in which a headbox delivers a pulp suspension to be thickened or washed and positioned with an outlet to discharge the pulp suspension into or onto the wire as it approaches the first roll, and in which the washed or dewatered pulp is collected after it has passed between the wire and a second roll, in which the first roll has a central shaft, and screw flighting on the shaft formed in left and right-hand sections are terminated at cylindrical discs mounted at opposite ends of the shaft, and in which the screw flighting has a depth which is substantially greater than the maximum thickness of the pulp layer and in which the aggregate open area between the screw flights is substantially greater than the cross-sectional area of the headbox outlet to assure that the spaces between the flights can be no more than partially filled with a pulp suspension during operation.
In an apparatus for dewatering or washing a suspension of paper pulp in water, including a frame, first and second rolls rotatably mounted in spaced relation in said frame, an endless loop of wire tensioned around said rolls in wrapping relation with a substantial portion of the circumference thereof and cooperating therewith to define a space bounded by said rolls and opposed connecting runs of said wire, a headbox mounted on said frame in said space and including an outlet slot for the pulp suspension to be thickened, said headbox being so positioned that said outlet slot discharges the pulp suspension onto said wire approaching or wrapping said first roll, means for driving at least one of said rolls to cause said wire to travel around said rolls at a speed effecting the development of centrifugal force, and causing liquid to be expressed through the portion of said wire wrapping each of said rolls and thereby to cause partially dewatered pulp to collect on the inner surface of said wire, and a pulp collector mounted on said frame in said space between said wire runs in position to collect said partially dewatered pulp, the improvement comprising:
In apparatus for dewatering or washing a paper pulp in a suspension of pulp and water in which first and second rolls are rotatably mounted in spaced relation to each other on a frame, and an endless loop of wire is tensioned around said rolls and defining a space bounded by said rolls and the opposed interconnecting runs of said wire, a headbox having a outlet positioned to direct pulp suspension to be treated by said apparatus into an entry zone defined by said first roll and a portion of a run of the wire approaching and wrapping said first roll, including a motor for driving at least one of the rolls to cause said wire to travel therearound, at a speed effecting the development of centrifugal force and causing liquid to be expressed through the portion of the wire wrapping each of the rolls, thereby to cause a partially dewatered pulp layer to collect on the inner surface of the wire, and including means in the space between the wire runs, positioned to collect partially dewatered pulp from the second roll, the improvement comprising:
Dependencies are inferred from the claim text.