Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-09-14
1990-02-13
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
68205R, 162 60, 210401, 210406, D21C 906, B01D 3338
Patent
active
049004000
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to apparatus for treating a pulp suspension with a treatment liquid.
The supply of treatment liquid is affected by a plurality of liquid supply devices located above the belt. Each such supply device normally sprays a liquid both in the direction in which the belt is running, and in the opposite direction thereagainst. In order to make maximum use of the liquid flow, half of it is thus directed in either direction. Unfortunately, the liquid applied countercurrently has a tendency to mix with the liquid content of the pulp instead of displacing the pulp, primarily because of the large impulse against the pulp web created thereby.
The same problem may occur in connection with the concurrent application of liquid, when the flow is too great. It is desirable to apply the maximum amount of liquid with each such distribution device. However, in view of the above difficulties, the supply of treatment liquid must be restricted, thereby restricting the production therewith. A need, therefore exists for more efficient application of the treatment liquid, and an increase in the production of treated liquid pulp.
SUMMARY OF THE INVENTION
In accordance with the present invention, one embodiment addresses these needs by providing an apparatus for treating the pulp suspension with a treatment liquid comprising a continuous liquid pervious belt for receiving the pulp suspension and moving the pulp suspension through a treatment zone in a predetermined direction. The treatment liquid supply means is located above the continuous belt in the treatment zone for supplying treatment liquid onto the pulp suspension as it travels through the treatment zone, and collection means are located below the continuous belt for receiving liquid passing through the pulp suspension. The treatment liquid supply means comprises a treatment liquid feed pipe for supplying a flow of the treatment liquid and distribution means for dividing that flow of treatment liquid into first and second flow components. The first flow component is disposed in the predetermined direction in which the belt is travelling, and the second flow component is disposed counter to that predetermined direction. Deflecting means are supplied for deflecting the second flow component into that predetermined direction, along with application means comprising first and second plate members for applying the first and second flow components onto the pulp suspension respectively, whereby the amount of the treatment liquid supplied to the pulp suspension is controlled.
In accordance with one embodiment of the present invention, the distribution means which are substantially symmetrical to the feed pipe. Preferably, the treatment liquid supply means extends across the entire width of the belt.
In accordance with another embodiment of the present invention, each of the first and second plate members includes at least one gap for supply of at least a portion of the first and second flow components therethrough. Preferably, first and second plate members are provided, including guide lip means associated with each of said at least one gap associated therewith. More preferably, guide lip means are also provided, located at the downstream edge of said at least one gap.
In accordance with another embodiment of the present invention, guide lip means are provided obliquely disposed with respect to said first and second plate members. Preferably, each of the first and second plate members includes end guide lip means at the ends of the plate members, and more preferably, the end guide lip means are obliquely disposed with respect to the first and second plate members.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of an apparatus in accordance with the present invention.
FIG. 2 is a cross-sectional view of the apparatus shown in FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The nature of the present invention can be more fully appreciated and understood with reference to the following
REFERENCES:
patent: 2185868 (1940-01-01), Schaefer
patent: 4569762 (1986-02-01), Gaudfrin
patent: 4657637 (1987-04-01), Lindstrom
Berg Jan-Erik
Gudmundsson Per E. W.
Lindstrom Alf I.
Hastings Karen M.
Sunds Defibrator Aktiebolag
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