WO2002048449A2 - Washing machine for cellulose fibers - Google Patents

Washing machine for cellulose fibers Download PDF

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Publication number
WO2002048449A2
WO2002048449A2 PCT/EP2001/014508 EP0114508W WO0248449A2 WO 2002048449 A2 WO2002048449 A2 WO 2002048449A2 EP 0114508 W EP0114508 W EP 0114508W WO 0248449 A2 WO0248449 A2 WO 0248449A2
Authority
WO
WIPO (PCT)
Prior art keywords
drum
machine
suspension
drums
cellulose fibers
Prior art date
Application number
PCT/EP2001/014508
Other languages
French (fr)
Other versions
WO2002048449A3 (en
Inventor
Franco Aver
Original Assignee
Comer Spa
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 Comer Spa filed Critical Comer Spa
Priority to AU2002234563A priority Critical patent/AU2002234563A1/en
Publication of WO2002048449A2 publication Critical patent/WO2002048449A2/en
Publication of WO2002048449A3 publication Critical patent/WO2002048449A3/en

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
    • 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
    • B01D33/044—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious 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
    • B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
    • B01D33/41—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in series connection
    • 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
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • 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

Definitions

  • the present invention relates to a washing machine for cellulose fibers used in papermaking industry.
  • a first selection of the cellulose fibers consists in separating the polluting particles contained in the stock that are particularly relevant when the starting material is for instance waste paper.
  • Such a separation is obtained by a washing operation carried out by special machines called washers, generally comprising a couple of drums, at least one of said drums being powered, a closed loop of wire provided with gauged holes being wound around the drums.
  • the couple of drums comprises a grooved drum having a plurality of circumferential parallel grooves and a smooth drum provided with a doctor board under which there is a recovery container for the washed cellulose fibers.
  • the cellulose fibers are dispersed in a water based solution with a maximum concentration of 1% contained in a tank.
  • This tank communicates with a headbox whose slice is arranged parallel to the axis of the drums inside the closed loop of the perforated wire and facing the zone where the perforated wire begins to bewound on the grooved drum.
  • the solution of cellulose fibers coming out from the headbox penetrates between wire and grooved drum and rotates together with drum adhering thereto for the wire winding length.
  • a drawback of the above mentioned washers of known type consists in that the drums, in order to eject efficiently water and contraries contained in the suspension, are being rotated at high speed so that the high centrifugal force causes also the short cellulose fibers to pass through the holes of the wire and are therefore removed together with contraries. This is a particularly relevant problem when suspensions comprising waste paper are being treated, in which the percentage of short fibers is very high.
  • Another drawback consists in that during the washing operation the longer and heavier cellulose fibers in view of the centrifugal force are distributed on the drums close to the wire contact surface, so as to form a mesh preventing the total ejection of water and contraries.
  • a last but not least drawback consists in that the above mentioned prior art machines washing considerable amounts of cellulose fibers in a short time, have big dimensions and therefore require much room.
  • the present invention aims at overcoming the above mentioned drawbacks.
  • a first object of the invention is to provide a washing machine for cellulose fibers in which the amount of short cellulose fibers ejected together with the contraries is considerably reduced.
  • Another object of the invention is to provide a machine that can eject a greater quantity of water and contraries in comparison with known machines of the same size and output.
  • a further object is to drastically reduce the position of long fibers on the wire surface that in the conventional machines reduces ejection of water and contraries.
  • a washing machine for a suspension of cellulose fibers in a liquid that according to the main claim comprises:
  • - means conveying said suspension to the starting zone of contact between said flexible wire and a first drum of said at least one couple of drums; - means for collecting the liquid containing said contraries coming from the washing operation of said suspension;
  • the perforated surface of said first drum is covered by a filtering mat cooperating with the perforated flexible wire.
  • a further water release occurs by the squeezing action produced by the wire and the second drum between which the washed suspension is contained.
  • the conveyance means for the suspension to be washed consist of a known headbox whose slice is facing the starting zone of contact between wire and the first drum.
  • the liquid and the contraries ejected from the cellulose suspension by the combined action of centrifugal force and squeezing action, are collected in containers, one being arranged inside the first drum and the other outside it.
  • the washed cellulose fibers left adhering to the wire are squeezed by the contact with the second drum, from which they are scraped and collected by gravity in a screw taking them away from the machine.
  • the machine of the invention allows to eject water and polluting particles without ejecting the short cellulose fibers as well.
  • the first drum discharges water and polluting particles both outside and inside, so that it is possible to obtain the same degree of suspension washing although the drum is rotating to a surface speed lower relative to drums of equivalent machine of the prior art.
  • the machine of the invention allows a uniform distribution of long fibers on the filtering surface, reducing their resistance to water ejection.
  • FIG. 1 is a side view of the machine of the invention
  • - Fig. 2 is a top plan view of the machine of Fig. 1 ; and - Fig. 3 is front view of the machine of Fig. 1.
  • the washing machine for cellulose fibers of the invention generally indicated with reference numeral 1 , comprises a frame 2 supporting a first drum 3 and a second drum 4 defining parallel and horizontal longitudinal axes X, Y respectively, on which a closed loop of flexible wire 5 provided with microholes is wound.
  • the first drum 3 as shown particularly in Fig. 3, has a central shaft 3a which is being rotated by driving means generally indicated with numeral 6.
  • the drum is further supported at the opposite end relative to the central shaft 3a by four grooved rollers 7 belonging to a plane generally orthogonal to its longitudinal axis X and supporting the drum at a circular ring 8 belonging to said drum.
  • Said driving means 6 comprise a motor 6a coupled to a driving unit consisting of a first pulley 6b fixed to the motor 6, a second pulley 6c fixed to the central shaft 3a and a driving belt 6d wound between said pulleys.
  • the flexible wire 5 is moved counterclockwise as indicated by the arrow 9, being moved by friction on the first drum 3 and being wound on the second drum 4 which however is idle and is supported by a central shaft 4a.
  • a filtering mat 10 is also wound and is interposed between the surface of the first drum 3 and the flexible wire 5 contributing to the washing operation of the cellulose fibers as it will be explained below.
  • the machine comprises also conveyance means for the suspension of cellulose fibers to be washed, generally indicated with numeral 11 , consisting of a headbox 12 whose slice 13 is facing the starting zone 14 of contact between the flexible wire 5 and the first drum 3.At second drum 4 there is at least a doctor board 16 which is in contact with the lateral surface 4b of the second drum 4 and is inclined to collection means for the washed fibers generally indicated with numeral 20.
  • These collection means as shown in greater detail also in fig. 2 comprise a container 21 arranged parallel to the axes X, Y of both drums 3, 4, inside which a screw 22 is rotating, extracting laterally the washed fibers along the direction Z shown in Fig. 2.
  • the lateral surface 3b of the first drum 3 is provided with through microholes.
  • the cellulose fibers come to the upper part of the second drum 4 where they are contacted by the doctor board 16 removing them from the surface of the drum and causing the fibers to fall by gravity inside the collection means 20 where the screw 22 moves them laterally away from the machine.
  • the rotation speed of the first drum 3 may be decreased and consequently the quantity of short cellulose fibers being lost by centrifugal force can be drastically reduced.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Paper (AREA)

Abstract

A washing machine (1) for a suspension (S) of cellulose fibers in a liquid is disclosed comprising: a couple of drums (3, 4) between which a closed loop of a flexible wire (5) provided with microholes is wound; conveyance means (11) of the suspension (S) arranged at the starting zone (14) of contact between the flexible wire (5) and a first drum (3); collection means (25, 26) of the liquid containing the contraries coming from the washing operation of the suspension (S); collection means (20) of the washed fibers arranged at a second drum (4), wherein the lateral surface (3b) of the first drum (3) is provided with through microholes.

Description

WASHING MACHINE FOR CELLULOSE FIBERS
The present invention relates to a washing machine for cellulose fibers used in papermaking industry.
It is well known that different stocks of cellulose fibers are used for making paper, whose chemical, physical and mechanical features must be carefully selected because they are decisive to define the quality of the paper being made.
A first selection of the cellulose fibers consists in separating the polluting particles contained in the stock that are particularly relevant when the starting material is for instance waste paper.
Such a separation is obtained by a washing operation carried out by special machines called washers, generally comprising a couple of drums, at least one of said drums being powered, a closed loop of wire provided with gauged holes being wound around the drums. The couple of drums comprises a grooved drum having a plurality of circumferential parallel grooves and a smooth drum provided with a doctor board under which there is a recovery container for the washed cellulose fibers. At start of the washing operation the cellulose fibers are dispersed in a water based solution with a maximum concentration of 1% contained in a tank.
This tank communicates with a headbox whose slice is arranged parallel to the axis of the drums inside the closed loop of the perforated wire and facing the zone where the perforated wire begins to bewound on the grooved drum. The solution of cellulose fibers coming out from the headbox penetrates between wire and grooved drum and rotates together with drum adhering thereto for the wire winding length.
In this operative stage the solution in view of the centrifugal force induced by the drum rotation, releases water and contraries of small size passing through the gauged holes of the wire and collected outside the machine. Therefore the suspension loses water and contained contraries not by squeezing but by centrifugal force induced thereon by the drum rotation, causing water and contraries to pass through the gauged holes of the wire. Subsequently the cellulose fibers adhering to the wire are delivered to the smooth drum where they are pressed so as to remove therefrom a further quantity of water, now by squeezing. At the end of the compression, when the wire leaves the smooth drum, the cellulose fibers result to be washed and adhere to the drum. The fibers are then removed from the drum through a scraping band and is recovered inside a container where they fall by gravity. A drawback of the above mentioned washers of known type consists in that the drums, in order to eject efficiently water and contraries contained in the suspension, are being rotated at high speed so that the high centrifugal force causes also the short cellulose fibers to pass through the holes of the wire and are therefore removed together with contraries. This is a particularly relevant problem when suspensions comprising waste paper are being treated, in which the percentage of short fibers is very high. Another drawback consists in that during the washing operation the longer and heavier cellulose fibers in view of the centrifugal force are distributed on the drums close to the wire contact surface, so as to form a mesh preventing the total ejection of water and contraries.
A last but not least drawback consists in that the above mentioned prior art machines washing considerable amounts of cellulose fibers in a short time, have big dimensions and therefore require much room. The present invention aims at overcoming the above mentioned drawbacks. A first object of the invention is to provide a washing machine for cellulose fibers in which the amount of short cellulose fibers ejected together with the contraries is considerably reduced.
Another object of the invention is to provide a machine that can eject a greater quantity of water and contraries in comparison with known machines of the same size and output.
A further object is to drastically reduce the position of long fibers on the wire surface that in the conventional machines reduces ejection of water and contraries.
Said objects are attained with a washing machine for a suspension of cellulose fibers in a liquid that according to the main claim comprises:
- at least a couple of drums between which a closed loop of a flexible wire provided with microholes is wound;
- means conveying said suspension to the starting zone of contact between said flexible wire and a first drum of said at least one couple of drums; - means for collecting the liquid containing said contraries coming from the washing operation of said suspension;
- means to collect the washed fibers arranged at a second drum of said at least one couple of drums, and is characterized in that the lateral surface of said first drum is provided with through microholes.
According to a preferred embodiment that will be described hereinafter, the perforated surface of said first drum is covered by a filtering mat cooperating with the perforated flexible wire.
Release of water and contraries contained in the suspension, occurs by the combined action of the centrifugal force induced on the suspension by rotation of the first drum pushing contraries and water outside the drum and by the squeezing action produced by the mutual contact between mat and wire pushing contraries and water inside the drum.
A further water release occurs by the squeezing action produced by the wire and the second drum between which the washed suspension is contained.
As to the conveyance means for the suspension to be washed, they consist of a known headbox whose slice is facing the starting zone of contact between wire and the first drum.
The liquid and the contraries ejected from the cellulose suspension by the combined action of centrifugal force and squeezing action, are collected in containers, one being arranged inside the first drum and the other outside it.
The washed cellulose fibers left adhering to the wire are squeezed by the contact with the second drum, from which they are scraped and collected by gravity in a screw taking them away from the machine. Advantageously the machine of the invention allows to eject water and polluting particles without ejecting the short cellulose fibers as well.
Indeed as the first drum is perforated, it discharges water and polluting particles both outside and inside, so that it is possible to obtain the same degree of suspension washing although the drum is rotating to a surface speed lower relative to drums of equivalent machine of the prior art.
Still advantageously the machine of the invention allows a uniform distribution of long fibers on the filtering surface, reducing their resistance to water ejection.
The above mentioned objects and advantages will be better understood from reading the description of the preferred embodiment of the invention which is given as an illustrative and non limiting example with reference to the accompanying sheets of drawings in which:
- Fig. 1 is a side view of the machine of the invention;
- Fig. 2 is a top plan view of the machine of Fig. 1 ; and - Fig. 3 is front view of the machine of Fig. 1.
As shown in Figs. 1 to 3, the washing machine for cellulose fibers of the invention generally indicated with reference numeral 1 , comprises a frame 2 supporting a first drum 3 and a second drum 4 defining parallel and horizontal longitudinal axes X, Y respectively, on which a closed loop of flexible wire 5 provided with microholes is wound.
The first drum 3 as shown particularly in Fig. 3, has a central shaft 3a which is being rotated by driving means generally indicated with numeral 6. The drum is further supported at the opposite end relative to the central shaft 3a by four grooved rollers 7 belonging to a plane generally orthogonal to its longitudinal axis X and supporting the drum at a circular ring 8 belonging to said drum.
Said driving means 6 comprise a motor 6a coupled to a driving unit consisting of a first pulley 6b fixed to the motor 6, a second pulley 6c fixed to the central shaft 3a and a driving belt 6d wound between said pulleys. The flexible wire 5 is moved counterclockwise as indicated by the arrow 9, being moved by friction on the first drum 3 and being wound on the second drum 4 which however is idle and is supported by a central shaft 4a. On the first drum 3 a filtering mat 10 is also wound and is interposed between the surface of the first drum 3 and the flexible wire 5 contributing to the washing operation of the cellulose fibers as it will be explained below. The machine comprises also conveyance means for the suspension of cellulose fibers to be washed, generally indicated with numeral 11 , consisting of a headbox 12 whose slice 13 is facing the starting zone 14 of contact between the flexible wire 5 and the first drum 3.At second drum 4 there is at least a doctor board 16 which is in contact with the lateral surface 4b of the second drum 4 and is inclined to collection means for the washed fibers generally indicated with numeral 20.
These collection means as shown in greater detail also in fig. 2 comprise a container 21 arranged parallel to the axes X, Y of both drums 3, 4, inside which a screw 22 is rotating, extracting laterally the washed fibers along the direction Z shown in Fig. 2. According to the invention the lateral surface 3b of the first drum 3 is provided with through microholes.
It has to be noted that in the machine there are collection means for the liquid containing the contraries arising from the washing operation of suspension S, comprising a first container 25 arranged outside and under both rotary drums
3, 4 and a second container 26 arranged inside the first filtering drum 3.
Inside the first drum 3 there are also scraping means 27 keeping clean its internal surface.
In operation during rotation of the first drum 3, the suspension of fibers S contained between the first drum 3 and the flexible wire 5 undergoes a centrifugation action.
Water and contraries contained therein are therefore ejected by centrifugal force outward through the microholes of the flexible wire 5.
Water and contraries coming out to the outside are collected in the first container 25 falling by gravity thereinto.
At the same time the suspension of fibers undergoes also a compression process to the filtering mat 10 through which further contraries also mixed with water are passing, falling by gravity inside the second container 26 arranged inside the first drum 3. The washed cellulose fibers remain adhering to the inner wall of the lower run
5a of the flexible wire 5 conveying the fibers in contact with the lateral surface
4b of the second drum 4 where they undergo a further loss of water by compression between the second drum 4 and the flexible wire 5.
Then the cellulose fibers come to the upper part of the second drum 4 where they are contacted by the doctor board 16 removing them from the surface of the drum and causing the fibers to fall by gravity inside the collection means 20 where the screw 22 moves them laterally away from the machine.
By acting with the two filtering surfaces in mutual contact, that is filtering mat
23 in combination with the flexible wire 5 provided with microholes, the rotation speed of the first drum 3 may be decreased and consequently the quantity of short cellulose fibers being lost by centrifugal force can be drastically reduced.
Moreover the deposition of long fibers preventing ejection of water and contraries is avoided as well.
From the foregoing one can see that the machine of the invention attains the intended objects. The machine may obviously be carried out in any size and possible modifications not shown and not mentioned when falling within the scope of the appended claims, should be considered covered by the present patent.

Claims

1) A washing machine (1 ) for a suspension (S) of cellulose fibers in a liquid comprising:
- at least a couple of drums (3, 4) between which a closed loop of a flexible wire (5) provided with microholes is wound;
- conveyance means (11) of said suspension (S) arranged at the starting zone (14) of contact between said flexible wire (5) and a first drum (3) of said at least a couple of drums;
- collection means (25, 26) of the liquid containing said contraries coming from the washing operation of said suspension (S);
- collection means (20) of the washed fibers arranged at a second drum (4) of said at least a couple of drums, characterized in that the lateral surface (3b) of said first drum (3) is provided with through microholes. 2) The machine (1 ) according to claim 1 ) characterized in that said collection means of the liquid containing said contraries comprise a first container (25) arranged outside and under said drums (3, 4) and a second container (26) arranged inside said first drum (3).
3) The machine (1 ) according to claim 1 ) characterized by comprising also a filtering mat (10) wound on the outer lateral surface (3b) of said first drum (3).
4) The machine (1 ) according to claim 1 ) characterized in that said first drum (3) has a central shaft (3a) coupled to driving means (6) adapted to rotate the drum and supported at the opposite end by grooved rollers (7) all arranged on a plane generally orthogonal to said central shaft (3a), and supporting said first drum (3) at a circular ring (8) provided on said drum.
5) The machine (1 ) according to claim 4) characterized in that said driving means (6) comprise a motor (6a) coupled to a driving unit consisting of a first pulley (6b) fixed to said motor (6), a second pulley (6c) fixed to said central shaft (3a) and a driving belt (6d) wound between said pulleys.
6) The machine (1 ) according to claim 1 ) characterized by comprising at least a doctor board (16) arranged in contact with the lateral surface (4b) of said second drum (4) and inclined to said collection means (20).
7) The machine (1 ) according to claim 1 ) or 6) characterized in that said collection means (20) comprise a container (21 ) arranged parallel to said drums (3, 4), a screw (22) being arranged inside said container.
8) The machine (1 ) according to claim 1 ) characterized in that said conveyance means (11 ) of said suspension (S) consist of a headbox (12).
9) The machine (1 ) according to claim 1 ) characterized in that said first drum (3) is provided inside with scraping means (27) arranged in contact with its inner surface.
PCT/EP2001/014508 2000-12-12 2001-12-11 Washing machine for cellulose fibers WO2002048449A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002234563A AU2002234563A1 (en) 2000-12-12 2001-12-11 Washing machine for cellulose fibers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI2000A000273 2000-12-12
IT2000VI000273A IT1315565B1 (en) 2000-12-12 2000-12-12 MACHINE FOR WASHING CELLULOSE FIBER

Publications (2)

Publication Number Publication Date
WO2002048449A2 true WO2002048449A2 (en) 2002-06-20
WO2002048449A3 WO2002048449A3 (en) 2002-11-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/014508 WO2002048449A2 (en) 2000-12-12 2001-12-11 Washing machine for cellulose fibers

Country Status (3)

Country Link
AU (1) AU2002234563A1 (en)
IT (1) IT1315565B1 (en)
WO (1) WO2002048449A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7344380B2 (en) 2002-09-13 2008-03-18 Magcode Ag Method and device for producing an electrical connection of sub-assemblies and modules

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722793A (en) * 1986-07-03 1988-02-02 The Black Clawson Company Apparatus and method for thickening pulp and paper stock
US5133832A (en) * 1991-07-08 1992-07-28 The Black Clawson Company Process and system for preparation of waste paper stock with short and long fiber fractionation
US5591336A (en) * 1988-10-28 1997-01-07 The Black Clawson Company Apparatus for dewatering and or washing papermaking stock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4722793A (en) * 1986-07-03 1988-02-02 The Black Clawson Company Apparatus and method for thickening pulp and paper stock
US5591336A (en) * 1988-10-28 1997-01-07 The Black Clawson Company Apparatus for dewatering and or washing papermaking stock
US5133832A (en) * 1991-07-08 1992-07-28 The Black Clawson Company Process and system for preparation of waste paper stock with short and long fiber fractionation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7344380B2 (en) 2002-09-13 2008-03-18 Magcode Ag Method and device for producing an electrical connection of sub-assemblies and modules

Also Published As

Publication number Publication date
IT1315565B1 (en) 2003-02-18
AU2002234563A1 (en) 2002-06-24
ITVI20000273A1 (en) 2002-06-12
WO2002048449A3 (en) 2002-11-14

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