EP0659933A1 - Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier et dispositif pour la mise en oeuvre du procédé - Google Patents

Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier et dispositif pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0659933A1
EP0659933A1 EP94402821A EP94402821A EP0659933A1 EP 0659933 A1 EP0659933 A1 EP 0659933A1 EP 94402821 A EP94402821 A EP 94402821A EP 94402821 A EP94402821 A EP 94402821A EP 0659933 A1 EP0659933 A1 EP 0659933A1
Authority
EP
European Patent Office
Prior art keywords
block
motor
drainage
fibrous suspension
fabric
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP94402821A
Other languages
German (de)
English (en)
French (fr)
Inventor
Daniel Haulot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chleq Frote et Cie
Original Assignee
Chleq Frote et Cie
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 Chleq Frote et Cie filed Critical Chleq Frote et Cie
Publication of EP0659933A1 publication Critical patent/EP0659933A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable

Definitions

  • the first drainage carried out in the area of the drainage elements is regular and progressive.
  • a drip roller is commonly used installed between two series of suction boxes.
  • This roller has the effect of modifying the distribution of the fibers in the sheet being formed, but to obtain the optimum effect of this drip roller, the fibrous suspension must be present at the entrance of the roller at a well determined concentration. .
  • the invention proposes to overcome these drawbacks by ensuring continuous adjustment of a movable or deformable draining element body, in an angular range of 0 to 4 °, so as to adapt the draining capacity of each element to the needs of each product produced, and to maintain constant the predetermined drip curves, so that the sheet being formed is presented at the entry of the drip roller with the desired concentration, thereby obtaining the desired air.
  • a main object of the present invention therefore consists in a process for controlling and adjusting the drainage of a fibrous suspension on a forming table of a paper machine comprising a fine fabric which is unrolled continuously and receives said suspension distributed by a head box, draining elements arranged under the fabric ensuring a first draining of the fibrous suspension, followed by wet boxes and boxes suction which completes the drainage, process by which the angles of the surface of the drainage elements are continuously adjusted relative to the surface of the fabric during the first phase of sheet formation as a function of the control of the levels of vacuum in the suction boxes and in the wet boxes downstream of said drainage elements and according to the measurement of the concentration of the fibrous suspension on the fabric of manufacture.
  • Another main object of the present invention consists of a device for implementing said method according to which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a forming table of a paper, the profiled part being a block that can be moved relative to a fixed profiled block with respect to the forming table to continuously give a variable angle of the ceramic coating relative to the fabric receiving the fibrous suspension.
  • the block is movable on the profiled block under the action of a motor engaged with the pivoting block, elastic means holding said blocks against each other, and the position of the end of the ceramic coating remains constant by relative to the canvas, whatever the angle of adjustment.
  • the elastic means consist of a metal clip or U-shaped stirrup.
  • the invention consists of a device for implementing said method in which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a training table of a paper, the profiled part being a deformable block having a one-piece extruded profile, the lower part of which is fixed with respect to the forming table and the upper part of which swivels slightly to continuously give a variable angle of the ceramic coating relative to to the canvas receiving the fibrous suspension.
  • the block is deformable under the action of a motor acting on the upper part of the block.
  • the active part of the motor is a deformable enclosure actuated by a thermodilatable device or a mechanical jack, or else it is a rack moving along a fixed element under the action of a cylinder also actuated by a thermodilatable device.
  • a control computer is connected to the motors of the drip elements, to the wet boxes and to the suction boxes as well as to concentration sensors of the fibrous suspension.
  • Figure 1 a schematic elevational view of a training table of a paper machine.
  • Figure 2 a sectional view on a larger scale of a standard profile of a drip element.
  • FIGS. 6a, 6b schematic views of alternative hydraulic versions of the motor of a drip element.
  • Figure 7 a schematic view of a mechanical version of the motor of a drip element.
  • Figure 8 an enlarged view of a rack of said motor element.
  • Figure 9 a schematic view of a paper machine training table with its control computer.
  • FIG. 1 illustrates the conventional profile of a forming table of a paper machine in which an endless cloth 5 rotates continuously between a head roller 2 and a driving roller 3 passing alternately above and below return rollers 4 which ensure its guidance and its tension.
  • the canvas is maintained by a succession of equipment, namely an entry marble 6, a series of boxes of draining elements designated as a whole by the reference 1 , wet boxes 7, suction boxes 8 between which a drip roller 9 is inserted and finally a suction cylinder 20 upstream of the driving roller 3.
  • FIG. 2 shows a standard profile of a drip element 1 in which one can recognize a block 10 serving as a support for an upper covering 11 made of ceramic, a block which is profiled at its lower part to adapt to a holding box not shown. It can be seen that the upper face 12 of the covering 11 forms an angle ⁇ - in the present case of the order of 4 ° - with the endless cloth 5.
  • FIG. 3a shows an example of a draining element 1 according to the invention in which the same parts are designated by the same references.
  • the block 10 serving as a support for the ceramic coating 11 rests on a second profiled block 13 which can be installed on the holding box and which is therefore fixed with respect to the training table.
  • the block 10 can pivot relative to this second block 13 thanks to an articulation 14 located on the side.
  • Each of the blocks (10, 13) has a lateral notch 15 serving as a housing for a ring 16 for blocking a clip 17 - a sort of spring blade which holds the blocks applied against each other.
  • a motor 18 resting on the block 13, and in engagement with the pivoting block 10 can impart to the latter a slight rotation around the articulation 14, which causes the modification of the angle of the surface 12 of the ceramic coating 11 relative to to the canvas.
  • FIG. 3b differs in that the articulation 14 is replaced by a particular profile of the block 13 which has a chute 34 with rounded walls inside which can slide a leg 35 which makes part of the block 10.
  • the motor 18 can therefore modify the angle ⁇ by spreading (on the left in the figure) the block 13, since the leg 35 can slide in the guide trough 34.
  • the position of the end A of the ceramic coating remains constant with respect to the fabric, whatever the angle ⁇ of adjustment.
  • FIGS 4 and 5 show alternative embodiments of the device shown in Figure 3.
  • the blocks 10 and 13 form between them a profiled cell 19 inside which a metal stirrup 21 in the shape of a U, comes out and ensures the connection between the two blocks.
  • a motor element 18 is housed between the branches of the stirrup 21 and, as in the previous case, it can give the block 10 a slight rotation with respect to the fixed block 13 which modifies the angle of the ceramic coating 11 by compared to the canvas.
  • the block 10 is deformable and has a one-piece extruded profile comprising the reservations necessary for fixing the ceramic coating 11, as well as for fixing to the supports of the box which hold the draining elements. It also has a central cell 19 containing a motor 18 which acts in an equivalent way by slightly pivoting the upper part of the block 10 while the lower part remains fixed with respect to the training table.
  • the motor element 18 can be produced in a hydraulic version or in a mechanical version.
  • FIG. 6a shows that the active part of the motor is a deformable enclosure 22 connected by a capillary 23 to a jack 24 actuated by a thermodilatable device 25 against the force of a small return spring 26 .
  • the deformable enclosure 22 is connected to a hydraulic cylinder 24 actuated by a mechanical cylinder, not shown, itself by an electric motor.
  • the capillary 23 leads to a capacity of thermodilatable fluid 25 subjected to a heating resistor 27.
  • a control computer 28 controls the two thermodilatable capacities, the hydraulic fluid at the deformable enclosure 22 being controlled by pressure (FIG. 6a), or by temperature (FIG. 6b).
  • the mobile element of the motor is a rack 29 which moves along a fixed element 30 under the action of a jack 31 connected by a capillary 23 to an actuator 25 of the kind described above.
  • a control computer 28 also controls this actuator.
  • the fixed element is internally serrated to hang the rack.
  • the rack 29 could move along the fixed element 30 under the action of an endless screw actuated by an electric or compressed air motor.
  • the fixed element 30 is not serrated but balls 32 ensure the locking of the rack 29.
  • the racks shown are double but they could be simple, according to another embodiment.
  • FIG. 9 The method for controlling the drainage of the fibrous suspension on the forming table is illustrated in FIG. 9.
  • the control computer 28 receives information, on the one hand on the angle of the ceramic coatings with respect to the fabric 5, for all of the draining elements 1, on the other hand on the vacuum control both at level of the wet boxes 7 as of the suction boxes 8 upstream of the drip roller 9.
  • the computer also receives detectors 33, on either side of said boxes, a signal representative of the continuous measurements at these two places of the concentration of fibrous suspension on the forming fabric.
  • the comparison of the measurement signal with a reference signal results in the formation of a comparison signal, on the basis of which the angles of the drip elements and of the valves controlling the vacuum of the suction boxes are adjusted. It is advantageous that the reference signal can take any value within a determined range so that the setting of the drip elements and the vacuum valves is only changed for a minimum variation of the concentration of the fibrous suspension on the fabric .

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  • Paper (AREA)
EP94402821A 1993-12-16 1994-12-08 Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier et dispositif pour la mise en oeuvre du procédé Withdrawn EP0659933A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9315153A FR2714088B1 (fr) 1993-12-16 1993-12-16 Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier et dispositif pour la mise en Óoeuvre du procédé.
FR9315153 1993-12-16

Publications (1)

Publication Number Publication Date
EP0659933A1 true EP0659933A1 (fr) 1995-06-28

Family

ID=9454014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402821A Withdrawn EP0659933A1 (fr) 1993-12-16 1994-12-08 Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier et dispositif pour la mise en oeuvre du procédé

Country Status (6)

Country Link
EP (1) EP0659933A1 (fi)
JP (1) JPH0827690A (fi)
CA (1) CA2137979A1 (fi)
FI (1) FI945939A (fi)
FR (1) FR2714088B1 (fi)
NO (1) NO944836L (fi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040016A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040025A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040032A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040021A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040020A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5220278B2 (ja) 2006-01-27 2013-06-26 任天堂株式会社 ゲーム装置および手書き入力プログラム

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497420A (en) * 1967-01-30 1970-02-24 Huyck Corp Continuously variable hydrofoils for papermaking wires
FR2012871A1 (fi) * 1968-07-12 1970-03-27 Voith
GB2194257A (en) * 1986-08-20 1988-03-02 Voith Gmbh J M Support unit for endless wire in papermaking machine
CH672155A5 (en) * 1986-12-01 1989-10-31 Leopold Sonntag Paper-making water extraction film - has pressure control to eliminate random vacuum at entry
DE4019921A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Stationaere stuetzvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497420A (en) * 1967-01-30 1970-02-24 Huyck Corp Continuously variable hydrofoils for papermaking wires
FR2012871A1 (fi) * 1968-07-12 1970-03-27 Voith
GB2194257A (en) * 1986-08-20 1988-03-02 Voith Gmbh J M Support unit for endless wire in papermaking machine
CH672155A5 (en) * 1986-12-01 1989-10-31 Leopold Sonntag Paper-making water extraction film - has pressure control to eliminate random vacuum at entry
DE4019921A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Stationaere stuetzvorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040016A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040025A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040032A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040021A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
DE102008040020A1 (de) 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
US8168042B2 (en) 2008-06-30 2012-05-01 Voith Patent Gmbh Bar arrangement for a machine for the production of a fibrous web

Also Published As

Publication number Publication date
NO944836D0 (no) 1994-12-14
FR2714088A1 (fr) 1995-06-23
JPH0827690A (ja) 1996-01-30
FI945939A0 (fi) 1994-12-16
NO944836L (no) 1995-06-19
FI945939A (fi) 1995-06-17
CA2137979A1 (fr) 1995-06-17
FR2714088B1 (fr) 1996-02-16

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