WO1980000460A1 - Appareil de lavage sous vide a deux courroies - Google Patents

Appareil de lavage sous vide a deux courroies Download PDF

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Publication number
WO1980000460A1
WO1980000460A1 PCT/US1979/000577 US7900577W WO8000460A1 WO 1980000460 A1 WO1980000460 A1 WO 1980000460A1 US 7900577 W US7900577 W US 7900577W WO 8000460 A1 WO8000460 A1 WO 8000460A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
liquid
belts
vacuum
mat
Prior art date
Application number
PCT/US1979/000577
Other languages
English (en)
Inventor
S Davis
Original Assignee
Envirotech Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Envirotech Corp filed Critical Envirotech Corp
Publication of WO1980000460A1 publication Critical patent/WO1980000460A1/fr

Links

Classifications

    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
    • D06B3/02—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fibres, slivers or rovings
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B5/00—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating
    • D06B5/02—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through moving materials of indefinite length
    • D06B5/04—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through moving materials of indefinite length through slivers or rovings

Definitions

  • the present invention relates to machines for washing paper stock pulp and other vacuum-filterable materials.
  • paper stock pulp is formed by digesting wood chips in the presence of various chemicals in a heated pressure vessel. After discharge from the pressure vessel, the paper stock pulp must be washed and filtered to separate the wood fibers from the digested chemicals.
  • materials such as waste paper and ground- wood, although not digested with chemicals, must neverthe ⁇ less be washed.
  • preparation and manufacture of other vacuum-filterable materials such as gold and uranium ores, sugar and phosphoric acid includes washing the materials with either water or chemicals. Conventional systems for washing such vacuum-filterable materials are known.
  • the primary object of the present invention is to provide an improved machine to wash paper stock pulp and other vacuum-filterable materials.
  • vacuum-filterable encompasses materials which, when covering a filtering surface, allow liquid to pass there ⁇ through when a pressure differential is applied.
  • pulp is used herein as a synonym for vacuum-filterable materials.
  • a more specific object of the present invention is to provide an improved machine for washing pulp which operates without re-pulping of the pulp stock.
  • Figure 1 is a side elevation of a machine according to the present invention shown schematically;
  • Figure 2 is a side elevation which schematically illustrates a particular modification of a machine according to the present invention.
  • Figure 3 is a side elevation which schematically illustrates another modification of a machine according to the present invention.
  • a machine according to this invention includes a horizontally-disposed drum 10.
  • the drum 10 includes a cylindrical sidewall 12 and end walls 14.
  • the cylindrical sidewall is perforated, say by small spaced-apart apertures, not shown.
  • Workers skilled in this art will readily recognize that the sidewall of the drum, instead of being perforated, could be comprised of a wedgewire grid or other conventional support means which permit liquid flow communication with the interior of the cylindrical sidewall 12.
  • the illustrated end walls 14 are nonforaminate; however, in practice they can be perforated or the like to reduce their weight.
  • Axle members, not shown, are fixed to the end walls 14, and are supported for rotation outboard of the drum by stationary pillow blocks or other journal means.
  • a rotary valve 20 with port 22 is formed in the axle members of the drum 10 in fluid-flow ' communication with radially-extending filtrate conduits 24 disposed within the drum 10.
  • the conduits 24 are connected to the aper ⁇ tures in the sidewall 12.
  • Such a structure is conven- tional.
  • the rotary valve communicates with the conduits 24 to permit liquid to flow through the apertures in the sidewall 12 and thence from the drum via the port 22.
  • the port 22 is coupled to a vacuum means to apply vacuum to the apertures via conduits 24.
  • open tank 30 is mounted below the drum 10.
  • the tank 30 is constructed and posi ⁇ tioned to encompass approximately the lower half of the drum 10 and to contain a substantial quantity of liquid exterior of the drum.
  • a liquid inlet means, such as a conduit 32 is connected in communication with the tank 30 to carry wash liquor thereinto.
  • the wash liquor may simply be fresh water while in other instances it may be aqueous solution of particular chemicals or non-aqueous solvent.
  • the machine in Figure 1 further includes feed means which, in the illustrated embodiment by way of example, comprises a horizontal vacuum pan 34 of conventional construction which is mounted to the left of the drum 10.
  • a conventional suction-producing device not shown, is connected in communication with the interior of the vacuum pan to draw liquid therefrom via a conduit 36.
  • a distribution box 38 Above the vacuum pan 34 is mounted a distribution box 38, which also can be understood to be of conventional construction.
  • the feed means could, alternatively, comprise other conventional means for forming a pulp mat on a belt. For example, some forming means are illustrated in Figures 2 and 3 and discussed below.
  • Two endless filter belts 50 and 52 are trained around the drum 10 as illustrated in Figure 1. More particularly, the endless belts are trained to pass around part of the drum 10 in face-to-face relationship to each other and to pass around a plurality of roller members.
  • the endless belts should be understood to comprise conventional porous belts of the type which are well known in the filtration art, and the roller members are rigid, hollow cylinder disposed on bearings to rotate about their axes.
  • the upper belt 50 is trained around rollers 54-58; and the lower belt 52 is trained around rollers 40, 42 and 60-68.
  • Conventional drive means are connected to rotatably drive the drum 10 and, thus, to cause the two endless belts 50 and 52 to travel together at equal speeds in the directions indicated by the arrows in Figure 1.
  • the drive means can be connected to drive a selected roller such as roller 40.
  • the rollers 56 and 64 are positioned to separate the upper and lower belts after the belts have passed around the drum 10 and, at the opposite end of the machine, rollers 54 and 42 are located to reunite the belts in face-to-face relationship after the lower belt 52 travels between the distribution box 38 and vacuum pan 34.
  • roller 60 can be adjusted to determine the extent to which the belts 50 and 52 wrap around the drum.
  • at least one roller in both the upper and lower sets of belts is movably mounted so that the tensions of the belts can be selec ⁇ tively adjusted.
  • conventional means for laterally aligning the belts are normally provided.
  • expression means are located between rollers 60 and 64 to express liquid from the pulp mat.
  • the expression means includes three
  • OMPI rollers 70 located in a triangular array adjacent roller 62.
  • a third belt 72 is trained around the rollers 70 above the belts 50 and 52 where they traverse roller 62.
  • the uppermost roller 70 can be positioned vertically to create a predetermined tension in the belt 72.
  • This expression means is conventional and known alternatives can be employed to apply pressure to the pulp mat to express liquid therefrom.
  • Collection trough 74 is disposed below roller 62 to collect liquid and carry it to disposal via line 76.
  • the illustrated spray means include spray nozzles 80 located adjacent the upper belt 50 between rollers 54 and 58 and adjacent the lower belt 52 between rollers 66 and 68. Collection means 82 are located beneath the nozzles 80 to collect liquid.
  • conventional spray means can also be utilized to wash the pulp.
  • spray nozzles 81 are located adjacent the upper part of the drum to spray liquid onto the belts and the pulp mat.
  • a vacuum-filterable material such as paper stock containing digestion chemicals
  • That material is then discharged onto the belt 52 as it travels across the vacuum pan 34.
  • Suction applied through the vacuum pan 34 draws liquid from the pulp, leaving a sheet or mat of partially dewatered pulp lying on the belt 52.
  • the withdrawn liquid, or filtrate is discharged from the machine.
  • the lower belt 52 after passage across the vacuum pan, meets the upper belt 50 in face-to-face rela ⁇ tionship and, thus, the mat of pulp is held between the two belts.
  • the pulp mat is about one-quarter to one inch in thickness.
  • the two belts 50 and 52 after passing through the liquid in the tank 30 remain next to the drum 10 for a predetermined part of the rotation of the drum and exposed to the air. During this time the vacuum inside the drum pulls liquid from the pulp mat to dry the pulp. Option ⁇ ally, additional liquid is sprayed onto the pulp mat at this time. Thereafter the belts leave the drum and travel over roller 60 and then between roller 62 and belt 70. During this stage, the pulp mat is squeezed between the belts due to the tension in the upper belt 70, and liquid is expressed from the pulp. Next, the upper and lower belts 50 and 52 are moved apart by the guide rollers 56 and 60 to expose the washed pulp mat. The pulp mat is then discharged from the machine by suitable means, not shown, such as a doctor blade or the like.
  • a machine according to this embodiment includes five horizontally-disposed drums 110, 112, 114, 116 and 118 which are mounted in spaced-apart, side-by-side relationship.
  • the five illustrated drums 110-118 are essentially the same in construction and operation as drum 10 shown in Figure 1 and described above.
  • a plurality open tanks 30 are mounted one below each of the respective drums 110, 112 and 116.
  • the tanks 30 associated with drums 112 and 116 are connected by an inclined plate 119 located beneath drum 114 so that liquid falling from drum 114 falls onto the plate and flows into tank 30.
  • a liquid inlet means such as a conduit 32 is connected in communication with the tank 30 associated with drum 116 to carry wash liquor into the tank.
  • the wash liquor may simply be fresh water while in other instances it may be a solution of particular chemicals.
  • the flow of wash liquid is countercurrent to the direction of travel of pulp material through the machine.
  • Liquid-carrying means are coupled to the drums 114-118 to convey liquid therefrom into tank 30 associated with drum 112.
  • the liquid-carrying means includes a plurality of pipes 120 coupled to the ports 22 of drums 114-118.
  • the pipes 120 are coupled in fluid-flow communication to the inlet of vacuum pump 122, and the outlet of the vacuum pump is coupled via line 123 to tank 30 associated with drum 112.
  • Liquid-carrying means including pipe 124 and vacuum pump 126 is coupled to drum 112 to produce a vacuum in the drum and convey liquid therefrom to disposal.
  • the rotary valve 20 of drum 110 includes two ports 127 and 128 coupled to pumps 129 and 130 respectively.
  • the port 127 communicates with the apertures in the wall
  • the port 128 communicates with the apertures above the liquid which are in contact with the pulp mat.
  • Such a structure is a conventional means to permit the liquid from the tank to be kept separate from the liquid and air removed from the pulp above the liquid.
  • vacuum means other than pumps are substituted for pumps 122, 126, 129 and 130.
  • Some pulps contain chemicals which contain soap-like chemicals which foam when pumped.
  • conven ⁇ tional vacuum receiving means are substituted for the pumps.
  • Conventional vacuum-receiving means for example, comprise a tank with a vacuum pump connected to its top, and liquid inlet means and discharge means connected near the bottom. Thereby the liquid is removed from the lower part of the tank after it has settled, and foaming is reduced or eliminated.
  • the machine in Figure 2 further includes feed means which, in the illustrated embodiment by way of example, comprises tank 30 associated with drum 110 and inlet conduit 132 coupled to the tank.
  • feed means which, in the illustrated embodiment by way of example, comprises tank 30 associated with drum 110 and inlet conduit 132 coupled to the tank.
  • the two endless belts 50 and 52 are trained around the drums in zig-zag fashion. More particularly, the endless belts are trained to pass under the drums 112 and 116, and over drums 110, 114 and 118.
  • the upper belt 50 is trained around a set of rollers 140; below the machine, the lower belt 52 is trained around a set of rollers 142.
  • Conven- tional drive means are connected to rotatably drive at least one of the drums and, thus, to cause the two endless belts 50 and 52 to travel together at equal speeds in the directions indicated by the arrows in Figure 2.
  • the upper and lower sets of rollers are positioned to separate the upper and lower belts after the belts have passed under the drum 116 and, at the opposite end of the
  • the lower set of rollers 142 is positioned so that the lower belt 52 passes around the portion of the drum 110 beneath the surface of the liquid in the tank 30 associated with that drum.
  • at least one roller in both the upper and lower sets is ovably mounted so that the tensions of the belts can be selectively adjusted. The tensions need not be the same.
  • the upper belt 50 is preferably at greater tension than the lower belt 52. This causes the compressive force on the pulp mat to be greater when the mat passes over the drums 114 and 118 than when it passes under the drums 112 and 116.
  • the belt 52 moves with the drum 110 out of the liquid and vacuum is still applied to the drum 110 to remove additional liquid from the pulp and hold the mat on the belt 52.
  • the lower belt 52 after traversing a predetermined part of the drum 110, meets the upper belt 50 in face-to-face relationship and, thus, the mat of pulp fibers is gripped between the two belts.
  • liquid from the first wash tank 30 passes through the pulp mat between the two belts and then flows into the interior of the first wash drum 112.
  • This flow of liquid through the pulp mat occurs because of the differential in the pressure between the interior and exterior of the wash drum 11; the differential head is provided and sustained by the pump 126 which continuously draws liquid from the interior of the drum 112 by vacuum.
  • the flow of liquid through the pulp mat serves to wash the pulp and, in some instances, also increases the moisture content of the pulp mat because some of the wash liquid is absorbed by the pulp.
  • the two belts 50 and 52 after passing under the drum 112, then pass over the drum 114.
  • vacuum is applied to the drum 114 by pump 122 to remove liquid from the pulp.
  • Optional sprays 80 spray wash water onto the pulp to futher wash it. Liquid falling from drum 114 is collected on the plate 119 and flows into tank 30.
  • the two endless belts 50 and 52 carry the pulp mat into the second tank 30 and then under the drum 116.
  • the pulp mat undergoes a second wash like the one described above.
  • the belts 50 and 52 are moved apart by the roller 140 and drum 118 to expose the washed pulp mat.
  • Vaccum applied to drum 118 dries the pulp mat, which is then discharged from the machine by suitable means, such as a doctor blade 144 or the like.
  • a machine according to this invention can include more than two tank and drum combinations depending upon the number of stages of washing which are required for a particular application.
  • the illustrated means includes a drum 10 which is the same in construction and operation as drum 10 shown in Figure 1 and described above.
  • Lower belt 52 is trained to cover approximately the upper half of the drum 10, and the upper belt 50 is located to meet the lower belt on the drum 10 about 90 degrees clockwise of the point of tangency of the lower belt 52 with the drum.
  • a feed means 150 is conventional and is located adjacent the drum near the exposed surace of the belt 52. In operation, vacuum-filterable material is applied to the belt 52 through feed means 150 while a vacuum is maintained within the drum to remove .water and form a pulp mat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'appareil et le procede pour le lavage de matieres premieres pour pate a papier et autres materiaux filtrables sous vide comprend un tambour laveur (10) monte dans une cuve (30). Deux courroies de filtration (50 et 52) sans fin sont disposees de maniere a passer autour du tambour de lavage (10) et au travers du liquide de lavage dispose dans la cuve. Une natte de pate a papier est formee entre les deux courroies de filtration sans fin (50 et 52) et transportee sur le tambour de lavage (10) et au travers de la cuve (30) pour y etre lavee. La liqueur de lavage est aspiree par le vide au travers de la natte de pate a papier pendant qu'elle circule autour du tambour (10) lavant ainsi cette natte de pate a papier. Lorsque cette pate a ete lavee elle est retiree d'entre les deux courroies (50 et 52).
PCT/US1979/000577 1978-08-18 1979-08-03 Appareil de lavage sous vide a deux courroies WO1980000460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93477378A 1978-08-18 1978-08-18
US934773 1978-08-18

Publications (1)

Publication Number Publication Date
WO1980000460A1 true WO1980000460A1 (fr) 1980-03-20

Family

ID=25466044

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US1979/000577 WO1980000460A1 (fr) 1978-08-18 1979-08-03 Appareil de lavage sous vide a deux courroies
PCT/US1979/000638 WO1980000461A1 (fr) 1978-08-18 1979-08-16 Laveuse par aspiration a double courroie

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US1979/000638 WO1980000461A1 (fr) 1978-08-18 1979-08-16 Laveuse par aspiration a double courroie

Country Status (9)

Country Link
AU (1) AU533130B2 (fr)
BE (1) BE878288A (fr)
CA (1) CA1111297A (fr)
ES (1) ES483455A1 (fr)
FR (1) FR2433610A1 (fr)
IT (1) IT1122494B (fr)
MX (1) MX148686A (fr)
WO (2) WO1980000460A1 (fr)
ZA (1) ZA794094B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4708773A (en) * 1984-09-12 1987-11-24 Mitsubishi Jukogyo Kabushiki Kaisha Impermeable plate for uniformly dispersing paper raw material in a twin wire paper former

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT387379B (de) * 1982-03-01 1989-01-10 Andritz Ag Maschf Einrichtung zur rueckbefeuchtung des filterkuchens an entwaesserungsmaschinen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76401C (fr) *
US899440A (en) * 1905-12-29 1908-09-22 Walter Erben Apparatus for extracting grease and potash salts from wool.
US1432319A (en) * 1921-04-08 1922-10-17 Brandwood John Apparatus for the dyeing and other treatment of textile fibers in the loose state
US2745712A (en) * 1953-10-22 1956-05-15 Improved Machinery Inc Process for countercurrent washing of cooking liquor out of pulp
US3488983A (en) * 1964-11-21 1970-01-13 Patentdienst Anst Apparatus for the wet treatment of materials
DE2121722A1 (en) * 1971-05-03 1972-11-23 Vepa Ag, Riehen, Basel (Schweiz) Impregnating appts - partic for uniformly impregnating a binding agent into fleece
US3770374A (en) * 1970-02-21 1973-11-06 Vepa Ag Process for the continuous steam treatment of staple fiber
US3806405A (en) * 1968-09-13 1974-04-23 Gelder Zonen Papierfab Van Method of applying a binder to a wetlaid fibrous web
US3834869A (en) * 1971-08-04 1974-09-10 Creusot Loire System for dispersing fibers in suspension including air laying web,conditioning fibers in web,dispersing web in liquid
US3857261A (en) * 1973-08-27 1974-12-31 Riggs & Lombard Inc Textile scouring range
DE1967079A1 (de) * 1969-02-25 1977-07-14 Vepa Ag Vorrichtung zum nassbehandeln von bahnfoermigen, zugempfindlichen guetern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR549694A (fr) * 1923-02-16
NO136891B (no) * 1973-01-10 1977-08-15 Stranger Johannessen Per Fremgangsm}te og apparat til kontinuerlig fortrengningsvasking av stoffmasser som inneholder en v{ske.
NO154136C (no) * 1977-11-21 1986-07-23 Envirotech Corp Maskin for vasking av papirmasse o.l.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL76401C (fr) *
US899440A (en) * 1905-12-29 1908-09-22 Walter Erben Apparatus for extracting grease and potash salts from wool.
US1432319A (en) * 1921-04-08 1922-10-17 Brandwood John Apparatus for the dyeing and other treatment of textile fibers in the loose state
US2745712A (en) * 1953-10-22 1956-05-15 Improved Machinery Inc Process for countercurrent washing of cooking liquor out of pulp
US3488983A (en) * 1964-11-21 1970-01-13 Patentdienst Anst Apparatus for the wet treatment of materials
US3806405A (en) * 1968-09-13 1974-04-23 Gelder Zonen Papierfab Van Method of applying a binder to a wetlaid fibrous web
DE1967079A1 (de) * 1969-02-25 1977-07-14 Vepa Ag Vorrichtung zum nassbehandeln von bahnfoermigen, zugempfindlichen guetern
US3770374A (en) * 1970-02-21 1973-11-06 Vepa Ag Process for the continuous steam treatment of staple fiber
DE2121722A1 (en) * 1971-05-03 1972-11-23 Vepa Ag, Riehen, Basel (Schweiz) Impregnating appts - partic for uniformly impregnating a binding agent into fleece
US3834869A (en) * 1971-08-04 1974-09-10 Creusot Loire System for dispersing fibers in suspension including air laying web,conditioning fibers in web,dispersing web in liquid
US3857261A (en) * 1973-08-27 1974-12-31 Riggs & Lombard Inc Textile scouring range

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4708773A (en) * 1984-09-12 1987-11-24 Mitsubishi Jukogyo Kabushiki Kaisha Impermeable plate for uniformly dispersing paper raw material in a twin wire paper former

Also Published As

Publication number Publication date
FR2433610B1 (fr) 1983-10-14
AU533130B2 (en) 1983-11-03
AU4970679A (en) 1980-02-21
IT1122494B (it) 1986-04-23
MX148686A (es) 1983-06-01
WO1980000461A1 (fr) 1980-03-20
ES483455A1 (es) 1980-09-01
IT7925092A0 (it) 1979-08-13
ZA794094B (en) 1980-08-27
BE878288A (fr) 1979-12-17
CA1111297A (fr) 1981-10-27
FR2433610A1 (fr) 1980-03-14

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