Textiles: fluid treating apparatus – Machines – With successive fluids and plural tubs
Patent
1988-07-13
1990-10-09
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
With successive fluids and plural tubs
68 22R, 68 44, 68181R, 68200, D06B 508
Patent
active
049613260
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the treatment of a material, in particular a web of material or pulp, made to pass between at least two endless permeable belts, in particular screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the material being passed between the belts, conveniently after passing a compression zone, advantageously a wedge-shaped compression zone, along at least one, in particular at least two containers serving for the supply or discharge of a treatment medium, for instance a washing fluid, a bleaching agent or other chemicals, this (these) container(s) being provided on at least a portion of its (their) surface(s) facing the belts and the material with openings for the treatment fluid and the material, after passing the container(s), optionally being conveyed to a compression zone, and these containers optionally being arranged in series one behind the other and advantageously being connected to inlets and outlets for various treatment media, for instance water and/or bleaching chemicals, possibly of various parameters or values of state, for instance various concentrations or various pressures.
It is common to wash cellulosic pulp and semi-pulp on rotary drum washers and flat Fourdrinier-type "long screen" washers. It is a disadvantage of these systems that with rotary drum washers, several of these must be arranged in series and the "long screen" washers are bulky. Both systems use vacuum to compressed air necessitating high installation investments and causing high energy consumption in use. The washing performance is rather good, but due to the dilution factor that is e.g. in a range of from 1 to 3.5, the fresh water need for the washing is relatively high. The said systems use displacement washing zones connected in series and run under use of a countercurrent. Even gravity washers have been suggested.
According to the invention, the disadvantages previously described can be largely eliminated by providing, in particular for a countercurrent treatment, advantageously for a countercurrent displacement washing, that the belts with the material lodged therebetween are made to pass in approximately horizontal loops, undulatios or the like, at least one of these loops or the like being passed around a container and two or more of said loops or the like passed individually from below around two or more of the containers and over at least one reversing roller, compression roller, through press nips or the like which are arranged on at least one container side, in the case of two or more containers between said containers, the treatment fluid inthe container(s) optionally being pressurized so that it can flow through the container openings to the belts and the material under pressure. The loop- or undulation-shaped path of the belts and the material results in a considerable reduction of the construction length of such washing apparatus or the like. If a treatment fluid which is pressurized instead of under vacuum is used for the operation, a considerable saving in energy is obtained in addition. The degree of effectiveness of the washing operation is increased by the straining or squeezing achieved by means of the reversing rollers, compression rollers or press nips. Moreover, the requirement of fresh treatment fluid is considerable reduced.
Conveniently, the treatment containers are arranged in particular at about equal level spacially from one another and in travel direction of the belts one behind the other, reversing rollers, compression rollers or press nips advantageously being provided and the direction of material transport between the containers. The degree of effectiveness can be particularly increased by providing for the belts with the material to be made to pass along the lateral walls of the, in particular deep, containers which are provided in this area with openings for the treatment fluid, in particular for the discharge of the treatment fluid. But under certain circumstances, it is
REFERENCES:
patent: 1794039 (1931-02-01), Silvano et al.
patent: 2555673 (1951-06-01), Beatty
patent: 3203207 (1965-08-01), Poncelet
patent: 3292397 (1966-12-01), Wooliever
patent: 4246669 (1981-01-01), Davis
patent: 4324116 (1982-04-01), Davis
Resch Franz
Sbaschnigg Johann
Coe Philip R.
Maschinenfabrik Andritz Actiengesellschaft
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