US3616660A - Apparatus for washing fibrous material - Google Patents

Apparatus for washing fibrous material Download PDF

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Publication number
US3616660A
US3616660A US826873A US3616660DA US3616660A US 3616660 A US3616660 A US 3616660A US 826873 A US826873 A US 826873A US 3616660D A US3616660D A US 3616660DA US 3616660 A US3616660 A US 3616660A
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Prior art keywords
web
liquid
drum
washing
zone
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US826873A
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English (en)
Inventor
Gosta Ingemar Ingermarsson
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Metso Fiber Karlstad AB
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Karlstad Mekaniska Ab
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
    • B01D33/644—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure plates, membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
    • B01D33/646—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/801—Driving means, shaft packing systems or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/804—Accessories integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/282—Filtering elements with a horizontal rotation or symmetry axis

Definitions

  • Apparatus for washing a fibrous, cellulosic material suspended in a liquid comprises a drum having a shell pervious to the suspension liquid and substantially nonpervious to the fibrous material, a member defining a webforming zone along the portion of the drum, a liquid pervious member defining a Washing zone along a second portion of the shell and a flexible foraminous belt trained around the drum within the members and mounted for movement with the drum surface.
  • the suspension liquid is introduced at the upstream end of the web-forming zone between the foraminous belt and the drum surface.
  • the member defining the web-forming zone is formed and positioned such that the web-forming zone is tapered in the direction of rotation of the drum, and thus under the influence of the pressure supply of the suspension, the fibrous material is drained inwardly through the shell and a web is formed on the drum surface.
  • Wash liquid is supplied under pressure from outside the liquid pervious member defining the washing zone and displaces suspension liquid from the web.
  • the liquids expressed and dis placed from the web are conducted away from inside the drum.
  • the liquid pervious member defining the washing zone is so formed and positioned relative to the drum surface that the thickness of the web is maintained at all points throughout the washing zone at a value not greater than the thickness of the web at any point in the web forming zone. Consequently, the fibrous material is not allowed to expand in the washing zone.
  • the apparatus also comprises a press roll downstream of the washing zone for dewatering the web and a device for removing the web from the apparatus.
  • This invention relates to apparatus for washing fibrous material suspended in a liquid and is particularly adapted for washing fibrous, cellulosic material.
  • Wood pulp and other materials containing cellulose are treated to liberate and yield cellulose by first cooking a suspension of the material in a liquid, usually water, such as in a pulp digester.
  • the suspension liquid is then separated from the fibers to the greatest extent possible.
  • the liquids separated from the cellulosic fibers are recovered.
  • the process of recovery of useful substances includes an evaporation step, and it is therefore advantageous to minimize the quantities of liquids utilized in the cellulose recovery process to the utmost extent.
  • One aspect of the recovery of the cellulose involves washing it after removing suspension liquid, and it is desirable to limit the amount of washing liquid.
  • the fibrous suspension from the digester is first diluted to a suitable consistency and is introduced into a vessel or trough.
  • a rotatable filter drum is partially immersed in the vessel or trough, and the hydrostatic pressure difference between the inside of the drum and the suspension liquid causes the liquid to drain through the drum shell and a web to be formed on the drum surface.
  • washing liquid is sprayed through the material and is drained through the drum shell.
  • the fibrous web is removed from the drum surface.
  • An amount of liquid equal to the amount of washing liquid sprayed onto the web is removed from the vessel or trough, while the remaining liquid is circulated back to the input to the filter washer and used to dilute the incoming fibrous suspension.
  • a filter-type washer One of the principal disadvantages of a filter-type washer is the requirement for circulating large quantities of liquid to form the web on the drum surface.
  • the equipment required is expensive and also requires a large amount of space.
  • the apparatus is subject to foaming problems.
  • Another important disadvantage is that the fibrous web, at the time that washing liquid is sprayed on it, has a relatively low solids content, so that lumen liquids and some liquids present in the voids between the fibers are not effectively removed by the washing.
  • the fibers of the fibrous web are relatively mobile, and the movement of the fibers tends to reduce the effectiveness of washing.
  • press-washing Another type of washing is so-called press-washing.
  • press-washing the suspension of fibrous material is diluted and then introduced into a pressing device, usually a screw press.
  • the pressing of the fibrous material yields a fibrous material having a high solid content, and lumen liquid generally participates in the wash process.
  • press-washing process requires less washing liquid.
  • the press-washing process has the disadvantage of requiring several stages of pressing, and the equipment tends to be complex and subject to mechanical difficulties.
  • a novel and improved apparatus for washing fibrous material such as cellulosic material
  • a novel and improved apparatus for washing fibrous material that overcomes the disadvantages associated with presently known devices of the above types and provides important advantages in its own right, such as requiring a minimum of wash liquid, producing a fibrous material substantially free of any remaining suspension liquid, and producing a fibrous material having a high dry content.
  • the apparatus is relatively trouble-free, and thus requires a minimum of maintenance and shut-down time.
  • the apparatus comprises a rotatable drum having a shell pervious to the liquid and substantially non-pervious to the fibrous material to be washed, a member positioned adjacent to the drum and defining a tapered web-forming zone extending over a portion of the drum circumference and a liquid pervious member defining with the drum surface a washing zone downstream from the web-forming zone and extending over a second portion of the drum surface.
  • a flexible, foraminous belt such as wire mesh belt, is trained around the drum within the two members and is arranged to rotate with the drum surface.
  • the fibrous suspension to be washed is introduced under pressure to the upstream end of the webforming zone between the drum surface and the foraminous belt, and as the drum surface and belt converge through the tapered web-forming zone, suspension liquid is expressed from the fibrous material into the drum, thus resulting in the formation of a web of fibrous material between the drum shell and the foraminous belt.
  • the member defining the web-forming zone is pervious to liquid, and the fibrous material drains outwardly through the belt and members. Liquid expressed outwardly may be collected in a collector tray or chamher.
  • the liquid-pervious member defining the washing zone is maintained in predetermined spaced relation to the drum surface and is formed, preferably with a curvature matching that of the drum shell, such that the thickness of the web as it traverses the washing zone is maintained at a value or values not in excess of the minimum thickness of the web in the forming zone. Consequently, there is no opportunity for the fibrous web to expand, thus resulting in displacement of the fibers which might affect efiicient washing, in the washing Z0116.
  • a washing liquid (usually water) is preferably supplied to the washing zone under pressure, a housing being associated with the liquid pervious member to define a washing liquid supply chamber outwardly of the washing zone and having one or more inlets.
  • a press roll adjacent the downstream end of the washing zone urges the wire and web against the drum surface to express wash liquid from the web into the drum, and the suspension liquid expressed from the fibrous material in the web-forming zone and displaced from the web in the washing zone, as well as the washing liquid removed by the press are withdrawn from within the drum. After pressing, the web is removed and disinte- 7 of the web. Moreover, the confinement of the fibrous material between the drum surface and wire, which is backed up by the member, allow the application of relatively high pressure to the web near the downstream end of the web-forming zone so that the web produced in the web-forming zone has a relatively high dry content. Consequently, the amount of washing liquid required to displace the remanent liquid is minimized in the apparatus.
  • the wash liquid may be supplied under a relatively high pressure, thereby providing effective displacement of the liquids from the web and into the drum. Moreover, because the Web is not permitted to expand and is carried between conjointly moving surfaces, the opportunity for displacement and relative movements of the fibers is substantially eliminated, thereby enhancing the effectiveness of the washing.
  • the washing zone may be divided into two or more circumferential sections. Clean washing liquid is supplied to the downstream section, and the liquid displaced from the web in the downstream washing section is separately collected within the drum and is supplied to the next upstream washing section. For example, if there are three sections, clean washing liquid is supplied to the downstream section, and the liquid displaced into the drum is collected and supplied as a washing liquid for the intermediate section. The liquid displaced into the drum in the intermediate section is collected within the drum and is delivered as the wash liquid to the upstream section. This arrangement is particularly advantageous from the standpoint of minimum washing liquid requirements.
  • the member defining the web-forming zone is preferably formed and positioned, relative to the drum surface, so that the thickness of the Web-forming zone decreases linearly in the direction of rotation of the drum.
  • the web-forming zone is designed to provide a web dryness at the end of the zone of at least 18 percent, and preferably on the order of 33 percent. A dryness of approximately 18 percent means that substantially all liquid in the void spaces between the fibers and also a part of the lumen liquid, is removed. At a solids content of..33v percent all lumen liquid has been removed.
  • the drying efficiency is a function of the ratio of the volume of washing liquid to the volume of suspension liquid retrained in the web.
  • the higher the solid content in the web formed in the forming zone the less the washing liquid to obtain a given washing efliciency.
  • the apparatus makes it possible to increase washing efiiciency significantly with a given amount of washing liquid.
  • FIG. 1 is an end sectional view in generally schematic form, showing one embodiment of the invention.
  • FIG. 2 is an end view, also generally schematic, of another embodiment of the invention.
  • the embodiments of the apparatus shown in the drawing comprise a drum 3, which is mounted for rotation about a shaft 1 and is provided with a perforated shell 5, such as a shell provided by a perforated body covered with a foraminous wire.
  • the shell is, of course, permeable to liquids but is substantially impermeable to the fibrous material to be treated.
  • a foraminous belt 7, such as a wire mesh is looped around the major portion of the drum surface, and is arranged to move conjointly with the drum surface in spaced relation. Beginning at the point near where the belt 7 is led to the drum surface and extending to over a portion of the drum surface in spaced relation is a first rigid member, such as a curved plate 9, that defines with the drum surface a web-forming zone 13.
  • the plate may be non-pervious to liquid but preferably is liquid-pervious, for example, by virtue of perforations.
  • the plate 9 is formed and positioned relative to the drum surface to define a convergent web-forming zone 13 that diminishes in thickness in the direction of rotation of the drum surface, preferably as a linear function of the distance measured along the drum surface.
  • a rigid liquidpervious member 11, which may also be a perforated plate, extends from a point adjacent the end of the plate 9 over another portion of the drum surface, in particular the major portion of the remaining part of the drum encompassed by the wire 7, and is formed and positioned relative to the drum surface to define a washing zone 15.
  • a collector or casing 19 In spaced relation outwardly of the plate 9 is a collector or casing 19 having an outlet 21, and associated with the plate 11 is a housing 25 having one or more inlet couplings 27 for introducing wash liquid into the wash liquid supply chamber.
  • the plates 9 and 11 are mounted on the casings l9 and 25, and the casings are preferably connected together by a pin 29.
  • the casings are carried by adjustable devices 31 that provide for positioning the liquid-pervious members 9 and 11 in desired predetermined positions relative to the drum.
  • the devices 31 are mechanisms that are responsive to pressures acting on the members 9 and 11, such as hydraulic cylinders, and they are arranged to provide controllable pressures for particular operating conditions of the apparatus.
  • the foraminous belt 7 is arranged to travel through the apparatus in engagement with the members 9 and 11 and is led away from the drum around a press roll 37 located downstream from the end of the washing zone.
  • the wire then leads to a carrier roll 39, turns around a. tension roll 41 and is led back to the drum by another carrier roll 39'.
  • the suspension of fibrous material to be washed is introduced between the wire 7 and the drum surface through a distribution box 43 located within the run of the wire from the press roll 37 back to the roll 39, the distribution box having a slice that provides delivery of the fibrous stock uniformly across the length of the drum.
  • Flexible seals 45 are located at the inlet from the slice to seal the space between the drum surface and the wire. Also within the run of the wire 7 between the press roll 37 and the.
  • roll 39 is a conveyor screw 47 for removing the web from the apparatus.
  • the ends of the drum are closed by end walls appropriately sealed to the drum and the members 9 and 11 to confine the web-forming zone and washing zone, and drains 51 are provided through the end walls to remove liquids from within the drum.
  • the embodiments further include apparatus for controlling the thickness of the fibrous web, such apparatus including an instrument 53, which may be any suitable mechanical, electro-mechanical or electronic device for detecting changes in the position of the member 11 in response to any change in thickness of the web.
  • the instrument 53 is connected (as represented by the line 55) to a controller 57, and the controller operates a servovalve 59 of an appropriate type in the supply conduit.
  • controller 57 a controller 57
  • Many types of control systems are well known to those skilled in the art, and therefore the details of a particular system need not be described or shown herein. Suffice it to say that a change in thickness of the web owing to some variation in the operating conditions will produce an adjustment in the supply of stock appropriate to return the web thickness to a desired value.
  • the apparatus of FIG. 1 operates in the following manner.
  • the fibrous suspension is supplied to the distribution box 43 at a predetermined rate, as described above, and it is evenly distributed across the inlet end of the webforming zone 13.
  • the suspension is delivered under pressure so that it is forced into the converging space between the wire 7 and the surface of the drum 5.
  • the wire moves conjointly with the drum surface due to friction between the drum surface and fibrous webs and the web and wire.
  • As the fibrous material sandwiched between the drum surface and wire moves along the forming zone, it is drained under positive pressure outwardly through the wire and the plate 9. Liquid expressed outwardly is collected by the casing 19 and is removed through the outlet 21.
  • the suspension is also drained inwardly into the drum through the drum shell, and the liquid is removed through the outlets 51.
  • the fibrous material progressively drains, it is formed into a web between the drum shell and the wire 7.
  • the pressure generated in the fibrous material along the forming zone is sufficient to cause the web to leave the forming zone with a relatively high solids content, say at least 18 percent and preferably on the order of 33 percent.
  • the web of fibrous material is then conducted from the web-forming zone 13 to the washing zone where it comes under the influence of the pressure of the plate 11 which, as described above, is positioned to maintain a web thickness not in excess of the minimum thickness achieved in the web-forming zone.
  • Washing liquid is supplied under pressure through the inlet 27 to the washing liquid supply chamber formed by the casing and is forced into the web, thereby displacing suspension liquid then entrained in the web and causing the suspension liquid to drain through the shell of the drum into the interior for removal through the outlets 51.
  • the devices 31 maintain the pressure throughout the washing zone at a substantially constant value, so that the dry content of the web in the washing zone remains substantially constant.
  • the web still sandwiched between the wire and drum shell, then passes through the nip formed by the press roll 37 and drum is dewatered, say to a dryness of on the order of 50 percent.
  • the press roll 37 may be a solid roll, it is advantageous to use a perforated suction press roll 37 so that dewatering of the web takes place not only inwardly through the drum shell but outwardly through the wire 7 and into the press roll 37.
  • the web is then delivered to the conveyor screw and is removed by the conveyor screw from the apparatus, the process of removal also resulting in breaking up the web and discharging the fibrous material in bulk form for further processing.
  • the apparatus of FIG. 2, as mentioned above, is substantially the same as the embodiment of FIG. 1.
  • the embodiment of FIG. 2 has a modified washing system.
  • the washing zone 15 is divided into three sections 63, 63 and 63", each washing section having a separate casing defining a separate wash liquid supply chamber and provided with a separate connection 27, 65, and 67, respectively.
  • Located within the drum inwardly of the sections 63 and 63 are separate collectors 69 and 71, each of which has an outlet 73 and 75, respectively.
  • the collector 69 serves the intermediate washing section 63'
  • the collector 71 serves the downstream section 63" as well as overlapping the press roll 37 so that liquid expressed from the web by the press roll 37 is collected in it.
  • clean wash liquid is supplied to the downstream wash section 63" through the inlet 67 and washes the web in the manner described above in connection with the embodiment of FIG. 1 by displacing liquid then entrained in the web and forcing the entrained liquid through the drum shell into the collector 71.
  • the liquid displaced into the collector 71, together with the liquid expressed from the web by the press roll 37, is collected and withdrawn through the outlet and is sup plied under pressure to the inlet 65 of the intermediate wash section 63.
  • This wash liquid washes the web, in the manner described above, and the liquid collected in the collector 69 is withdrawn to the outlet 73 and is supplied under pressure to the inlet 27 to the first or upstream wash section 63, again washing the web and displacing liquid from the web through the shell and into the interior of the drum where it is removed through the main outlet 51.
  • FIGS. 1 and 2 are provided with liquid-pervious members 9 defining the webforming zone, a solid member may be substituted, thus providing drainage of the web only inwardly through the shell.
  • the embodiment of FIG. 2 may be further modified by omitting one of the three units or sections of the washing zone or by adding additional sections.
  • Apparatus for washing a fibrous material suspended in a liquid comprising a drum having a shell pervious to the liquid and substantially non-pervious to the fibrous material; means for rotating the drum, means including a rigid curved plate-like member positioned to encompass a substantial segment of the drum shell and defining a web forming zone along a portion of the periphery of the drum shell, the forming zone being a space bet-ween the drum and member and being tapered in the direction of rotation of the drum, means including a rigid curved liquid-pervious plate-like member positioned to encompass a substantial segment of the drum surface and defining along a second portion of the drum surface downstream from the first portion, relative to the direction of rotation of the drum, a washing zone, a flexible foraminous belt trained around the drum within the rigid member and the liquid-pervious member and mounted for movement with the drum surface, means for introducing the suspension of fibrous material in a liquid at the upstream end, relative to the direction of rotation of the drum, of the web-forming zone between the
  • Apparatus according to claim 1 further comprising a press means downstream from the wash zone for urging the belt and web against the drum surface to express washing liquid from the web prior to its removal from the apparatus.
  • the means for introducing washing liquid to the washing zone comprises a housing in spaced relation to the said liquidpervious member defining the Washing zone, the housing defining a wash liquid supply chamber and having at least one inlet for receiving washing liquid.
  • Aparatus according to claim 11 wherein the means for introducing the suspension liquid to the web-forming zone is a slice adapted to supply the suspension liquid uni formly across the web-forming zone longitudinally of the drum.
  • the washing zone comprises at least two circumferential sections including an upstream section and a downstream section and wherein the means for supplying washing liquid to the washing zone includes a first supply means for supplying wash liquid to the upstream section and second supply means for supplying wash liquid to the downstream section.
  • first and second supply means include housing members in spaced relation to the rigid liquid-pervious member and defining, respectively, first and second supply chambers outwardly of the respective first and second sections of the washing zone and at least one inlet communicating with each of the said first and second supply chambers for supply of washing liquid thereto' 11.
  • Apparatus according to claim lit further comprising collector means within the drum inwardly of the downstream. washing zone section for collecting liquids expressed and displaced from the web in the said downstream washing zone section, means coupled to said collector for removing liquids therefrom, and wherein the first supply means receives liquid from the said collector means.
  • the washing zone includes three contiguous circumferential sections, and further comprising casings associated with the rigid liquid-pervious member defining individual washing liquid supply chambers associated with each of said three sections, at least one wash inlet associated with each supply chamber, a collector located inwardly of each of the downstream two of the three sections for receiving liquids expressed and displaced from the web in each such two sections, means associated with the last downstream collector for removing liquids therefrom and introducing them to the intermediate section, and means associated with the collector for the intermediate section for removing liquids therefrom and introducing such liquids to the upstream section.
  • Apparatus according to claim 12 further comprising a press roll downstream of the downstream wash zone section for urging the wire and web against the drum surface to express liquid from the web, and wherein the downstream collector is positioned to receive liquids expressed from the web by the pres roll.
  • Apparatus according to claim 1 further comprising means for monitoring the thickness of the web and producing a signal indicative thereof, and means responsive to the signal for controlling the thickness of the web.
  • Apparatus according to claim 14 wherein the means for controlling the thickness of the Web comprising means responsive to the said control signal for varying the rate of delivery of suspension material to the web-forming zone.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
US826873A 1968-05-24 1969-05-22 Apparatus for washing fibrous material Expired - Lifetime US3616660A (en)

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SE7004/68A SE318183B (fi) 1968-05-24 1968-05-24

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US (1) US3616660A (fi)
JP (1) JPS5018082B1 (fi)
CS (1) CS150261B2 (fi)
DE (1) DE1926516A1 (fi)
NO (1) NO134564C (fi)
SE (1) SE318183B (fi)
SU (1) SU402179A3 (fi)

Cited By (18)

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Publication number Priority date Publication date Assignee Title
US3878698A (en) * 1971-12-14 1975-04-22 Karlstad Mekaniska Ab Apparatus for forming and washing a fibrous web
FR2384061A1 (fr) * 1977-03-18 1978-10-13 Ingersoll Rand Co Laveur de pate a papier
US4217170A (en) * 1977-11-18 1980-08-12 Ingersoll-Rand Company Pulp washer discharging a low consistency pulp slurry
US4501040A (en) * 1980-02-06 1985-02-26 Escher Wyss Gmbh Method and apparatus for washing stock suspensions by removing undesired material through an endless wire
EP0173519A1 (en) * 1984-08-16 1986-03-05 Miply Equipment Inc. Method and apparatus for pressure saturation of substrate
US4686005A (en) * 1980-02-06 1987-08-11 Escher Wyss Gmbh Method of washing stock suspensions by removing undesired material through an endless revolving wire
US4740305A (en) * 1986-10-23 1988-04-26 Miller Ray R Method and apparatus for treatment of a permeable web with a fluid
US4750340A (en) * 1985-10-31 1988-06-14 Kamyr Ab Apparatus for treating a fibre suspension
US4826555A (en) * 1986-02-28 1989-05-02 Miply Equipment, Inc. Method and apparatus for compressing a self-supported web
US5186791A (en) * 1988-10-28 1993-02-16 The Black Clawson Company Apparatus for thickening pulp and paper stock
US5382327A (en) * 1988-10-28 1995-01-17 The Black Clawson Company Apparatus for thickening pulp and paper stock
US5384014A (en) * 1988-11-30 1995-01-24 The Black Clawson Company Apparatus and method for thickening pulp and paper stock
CN1061114C (zh) * 1996-03-07 2001-01-24 Lg电子株式会社 全自动洗衣机的隔离洗装置
WO2004025019A1 (en) * 2002-09-16 2004-03-25 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Process and arrangement for replacing intra-fiber liquid in fibers with a replacement liquid
US20080061011A1 (en) * 2004-07-09 2008-03-13 Hans-Peter Schmid Filter With Resuspension Of Solids
WO2008088279A1 (en) * 2007-01-16 2008-07-24 Metso Paper, Inc. Device and method for washing and dewatering cellulose pulp
US8556087B2 (en) * 2005-06-03 2013-10-15 Metso Paper, Inc. Arrangement for the treatment of cellulose pulp in a washing apparatus arranged with a reinforcing frame
US11613484B2 (en) * 2015-05-29 2023-03-28 Anaergia Inc. Organics recovery from dry fraction

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
EP0162179A1 (de) * 1984-05-21 1985-11-27 Sulzer-Escher Wyss Gmbh Verfahren zum Waschen von aus Altpapier gewonnenen Faserstoffsuspensionen sowie Vorrichtung zur Ausführung des Verfahrens
US4986881A (en) * 1989-06-28 1991-01-22 Kamyr, Inc. Method and apparatus for liquid treatment of and liquid extraction on a paper pulp
SE533686C2 (sv) * 2009-04-09 2010-12-07 Andritz Oy Press för avvattning av en suspension, samt sätt för rengöring av denna

Cited By (22)

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US3878698A (en) * 1971-12-14 1975-04-22 Karlstad Mekaniska Ab Apparatus for forming and washing a fibrous web
FR2384061A1 (fr) * 1977-03-18 1978-10-13 Ingersoll Rand Co Laveur de pate a papier
US4217170A (en) * 1977-11-18 1980-08-12 Ingersoll-Rand Company Pulp washer discharging a low consistency pulp slurry
US4501040A (en) * 1980-02-06 1985-02-26 Escher Wyss Gmbh Method and apparatus for washing stock suspensions by removing undesired material through an endless wire
US4686005A (en) * 1980-02-06 1987-08-11 Escher Wyss Gmbh Method of washing stock suspensions by removing undesired material through an endless revolving wire
EP0173519A1 (en) * 1984-08-16 1986-03-05 Miply Equipment Inc. Method and apparatus for pressure saturation of substrate
US4588616A (en) * 1984-08-16 1986-05-13 Miply Equipment Inc. Method and apparatus for pressure saturation of substrate
US4750340A (en) * 1985-10-31 1988-06-14 Kamyr Ab Apparatus for treating a fibre suspension
US4826555A (en) * 1986-02-28 1989-05-02 Miply Equipment, Inc. Method and apparatus for compressing a self-supported web
WO1988003046A1 (en) * 1986-10-23 1988-05-05 Miller Ray R Method and apparatus for treatment of a permeable web with a fluid
US4740305A (en) * 1986-10-23 1988-04-26 Miller Ray R Method and apparatus for treatment of a permeable web with a fluid
US5186791A (en) * 1988-10-28 1993-02-16 The Black Clawson Company Apparatus for thickening pulp and paper stock
US5382327A (en) * 1988-10-28 1995-01-17 The Black Clawson Company Apparatus for thickening pulp and paper stock
US5384014A (en) * 1988-11-30 1995-01-24 The Black Clawson Company Apparatus and method for thickening pulp and paper stock
CN1061114C (zh) * 1996-03-07 2001-01-24 Lg电子株式会社 全自动洗衣机的隔离洗装置
WO2004025019A1 (en) * 2002-09-16 2004-03-25 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Process and arrangement for replacing intra-fiber liquid in fibers with a replacement liquid
US20060124259A1 (en) * 2002-09-16 2006-06-15 Asa Samuelsson Process and arrangement for replacing intra-fiber liquid in fibers with a replacement liquid
US20080061011A1 (en) * 2004-07-09 2008-03-13 Hans-Peter Schmid Filter With Resuspension Of Solids
US7807060B2 (en) * 2004-07-09 2010-10-05 Bhs-Sonthofen Gmbh Filter with resuspension of solids
US8556087B2 (en) * 2005-06-03 2013-10-15 Metso Paper, Inc. Arrangement for the treatment of cellulose pulp in a washing apparatus arranged with a reinforcing frame
WO2008088279A1 (en) * 2007-01-16 2008-07-24 Metso Paper, Inc. Device and method for washing and dewatering cellulose pulp
US11613484B2 (en) * 2015-05-29 2023-03-28 Anaergia Inc. Organics recovery from dry fraction

Also Published As

Publication number Publication date
NO134564B (fi) 1976-07-26
SE318183B (fi) 1969-12-01
DE1926516A1 (de) 1970-01-02
NO134564C (fi) 1976-11-03
JPS5018082B1 (fi) 1975-06-26
CS150261B2 (fi) 1973-09-04
SU402179A3 (fi) 1973-10-12

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