| 摘要 |
PCT No. PCT/AT87/00053 Sec. 371 Date Jul. 13, 1988 Sec. 102(e) Date Jul. 13, 1988 PCT Filed Sep. 16, 1987 PCT Pub. No. WO88/02045 PCT Pub. Date Mar. 24, 1988.The invention relates to an apparatus or device for the treatment of a material, in particular a web of material or pulp, made to pass between at least two endless permeable belts, for instance screen belts or the like conveying means, preferably for the displacement washing of a filter cake or for washing fibrous matter, the material being passed between the belts along at least two containers serving for the supply of a treatment medium, for instance a washing fluid, a bleaching agent or other chemicals. It is the object of the invention to provide a compact apparatus of this type at simultaneous good effectiveness. This object is achieved according to the invention by passing the belts with the material lodged therebetween, in particular for a countercurrent treatment, preferably for a countercurrent displacement washing, first through one or several zone(s) in which pressurized treatment fluid is fed from the top to the belts and the material from pressurized containers with one or more wall portion(s), in particular bottom(s), provided with openings and contacting the upper belt, in which zones there is essentially normal air pressure or atmospheric pressure or environmental pressure underneath the lower belt and subsequently through straining zones formed by pressing reversing rollers, compression rollers, press nips or the like arranged spacially from the pressurized containers and supported separately from these. |
