Textiles: fluid treating apparatus – Machines – With successive fluids and plural tubs
Patent
1988-07-13
1990-06-26
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
With successive fluids and plural tubs
68 22R, 68 44, 68181R, 68200, D06B 508
Patent
active
049361180
DESCRIPTION:
BRIEF SUMMARY
Suject of the invention is an apparatus or device for treating material, in particular a web of said material or matter, carried between at least two endless premeable belts, for instance screen belts or the like transport means, preferably for displacement washing of a filter cake or for washing fibrous materials, in which the material is carried between said belts, in particular after passing a pressure zone, preferably a wedge-like compression zone, along at least two containers, being in particular arranged at the same height each one after the other as viewed in the direction of movement of said belts, in a distance from each other and above the said belts and serving for supplying a treatment medium, e.g. a washing fluid, a bleaching agent or other chemicals, wherein the said material is guided onto a compression roller or like device being arranged between the said containers after having passed individual containers and wherein the said containers may be arranged in series and may be connected with supply and withdraw lines for various treatment media, e.g. water and/or bleaching chemicals that may be moved according to various parameters or conditions, e.g. varying concentration or varying pressure.
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 or 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. within range of from 1 to 3,5, the fresh water need for the washing is relatively high. The said systems use displacement washihg zones connected in series and being run using a counter-current. Even gravity washers have been suggested yet. Even with the apparatus for washing cellulosic pulp as disclosed in the U.S. Pat. No. 2,356,285, vacuum is applied on the lower part of the belt. This is highly energy-consuming and necessitates costly apparative provisions as special seals must be provided at said lower face of the belt. This apparatus appears the more complicated by the fact that the washing fluid containers being arranged above the said screen belts are bottomless, so that special seals must be provided also with regard to the upper belt.
The invention offers, among other advantages, a far-reaching remedy for the above drawbacks, in that, particularly for the purpose of countercurrent treatment, preferably countercurrent displacement washing, the said belts carrying between themselves the said material are moved through at least one zone in which treatment fluid under pressure is conveyed from above to said belts and the material from pressurized containers having one or more wall portions--particularly its bottom portions--with openings and contacting the said upper belt, in which below the said lower belt there is substantially normal, atmospheric or environmental pressure, and in which they are after that moved through straining zones formed by pressing guiding rollers, compression rollers, press nips or the like arranged spaced apart and supported independently from said pressurized containers, wherein advantageously the said belts carrying the said material are also contacting said wall portions of at least one pressurized container having openings.
By the inventive feature to build up the necessary difference in pressure by suppling the treatment fluid from above under pressure (pressurized containers) and providing for atmospheric pressure below the said belts, and by bottom portions or the like in said pressurized containers arranged above the belts and only having openings for conveying the treatment fluid to the belts and the material in between so that the said pressure difference can be maintained, all the above drawbacks of the apparatus according to U.S. Pat. No. 2,356,285 are obviated. An additional
REFERENCES:
patent: 1185766 (1916-06-01), Brunger
patent: 1794039 (1931-02-01), Silvano et al.
patent: 2356285 (1944-08-01), Street
patent: 4324116 (1982-04-01), Davis
Resch Franz
Sbaschnigg Johann
Coe Philip R.
Maschinenfabrik Andritz Actiengesellschaft
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