Paper making and fiber liberation – Apparatus – With beating – refining – and/or disintegrating means
Patent
1998-06-08
2000-03-14
Fiorilla, Christopher A.
Paper making and fiber liberation
Apparatus
With beating, refining, and/or disintegrating means
162272, D21D 100
Patent
active
060368187
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pulp-dewatering roll press.
BACKGROUND OF THE INVENTION
One problem with roll presses resides in the uneven outfeed from the press. Many attempts have thus been made to rectify such outfeed pulsations, without successfully solving the problem, however. In this regard, attempts have been made to solve the problem by improving the disintegrating capacity of the pulp disintegrating screw, although without any great success. Instead, attention has been concentrated on the pulp cake that forms above the roll nip in the space between the rolls and the pulp disintegrating screw.
An object of the present invention is therefore to solve the aforesaid problem and to achieve an essentially even outfeed from the press.
SUMMARY OF THE INVENTION
These and other objects have now been achieved by the invention of pulp-dewatering apparatus comprising a pair of press rolls rotatably mounted adjacent to each other in order to provide a nip region therebetween, a rotatable pulp disintegrating screw rotatably disposed above the nip region, whereby pulp fed through the nip region is directed towards the pulp disintegrating screw to be further disintegrated and transported thereby, a first doctor bar associated with one of the pair of press rolls, a second doctor bar associated with the other of the pair of press rolls, the first doctor bar including a first doctor blade for removing pulp from the surface of the one of the pair of press rolls, and the second doctor bar including a second doctor blade for removing pulp from the surface of the other of the pair of press rolls, one of the first and second doctor blades being disposed adjacent to the nip region below the pulp disintegrating screw whereby the space between the pair of press rolls and the pulp disintegrating screw in which pulp cake can form is substantially reduced.
In accordance with one embodiment of the pulp-dewatering apparatus of the present invention, the pulp disintegrating screw includes a center of rotation, and the one of the first and second doctor blades is disposed at least partially below the center of rotation of the disintegrating screw.
In accordance with another embodiment of the pulp-dewatering apparatus of the present invention, the space between the pair of press rolls and pulp disintegrating screw has a predetermined configuration, and the one of the first and second doctor bars has a cross-sectional shape corresponding to the predetermined configuration whereby the doctor bar fills a substantial portion of the space.
In accordance with another embodiment of the pulp-dewatering apparatus of the present invention, the apparatus includes first and second seals disposed at opposite ends of the pair of press rolls for sealing the ends of the pair of press rolls, and the one of the first and second doctor bars is at least partially suspended from one of the first and second seals.
In accordance with another embodiment of the pulp-dewatering apparatus of the present invention, the apparatus includes first and second support beams for supporting the first and second doctor bars, and the one of the first and second doctor bars is supported by a corresponding one of the first and second support beams, and the apparatus includes a cover plate provided between the one of the first and second doctor bars and the corresponding one of the first and second support beams extending along the periphery of the pulp disintegrating screw whereby the space between the first and second pressure rolls and the pulp disintegrating screw for passage of the pulp is further reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention can be more fully appreciated with reference to the following detailed description, which, in turn, refers to the drawings in which:
FIG. 1 is a side, cross-sectional view of a conventional roll press according to the prior art;
FIG. 2 is a schematic representation of the apparatus shown in FIG. 1 demonstrating the formation of a pulp cake therein;
FIG. 3 is a partial, side
REFERENCES:
patent: 1322489 (1919-11-01), Howard
patent: 3261741 (1966-07-01), Bidwell
patent: 3772144 (1973-11-01), Luthi et al.
Fiorilla Christopher A.
Sunds Defibrator Industries AB
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