EP0031445B1 - Procédé pour agir sur une nappe de fibres pré-égouttée sur un tamis, et appareil pour la mise en oeuvre du procédé - Google Patents

Procédé pour agir sur une nappe de fibres pré-égouttée sur un tamis, et appareil pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0031445B1
EP0031445B1 EP80107179A EP80107179A EP0031445B1 EP 0031445 B1 EP0031445 B1 EP 0031445B1 EP 80107179 A EP80107179 A EP 80107179A EP 80107179 A EP80107179 A EP 80107179A EP 0031445 B1 EP0031445 B1 EP 0031445B1
Authority
EP
European Patent Office
Prior art keywords
filter
water
screen
surface pressure
extraction device
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.)
Expired
Application number
EP80107179A
Other languages
German (de)
English (en)
Other versions
EP0031445A1 (fr
Inventor
Sylvia Schmidt
Hansdieter Eckert
Wolfgang Holzinger
Dietrich Holle
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.)
Andreas Kufferath KG
Neue Bruderhaus Maschinenfabrik GmbH
Original Assignee
Andreas Kufferath KG
Neue Bruderhaus Maschinenfabrik GmbH
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 Andreas Kufferath KG, Neue Bruderhaus Maschinenfabrik GmbH filed Critical Andreas Kufferath KG
Priority to AT80107179T priority Critical patent/ATE12274T1/de
Publication of EP0031445A1 publication Critical patent/EP0031445A1/fr
Application granted granted Critical
Publication of EP0031445B1 publication Critical patent/EP0031445B1/fr
Expired 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper

Definitions

  • the invention relates to a method for reorienting the fibers in the top layer of a pre-dewatered nonwoven fabric lying on a first screen, in which the nonwoven fabric comes into contact with the second screen of the nonwoven fabric facing away from the first screen within a selectable distance a screen roller wraps around a part of its circumference, is subjected to surface pressure, and a device for performing this method.
  • a screen roller exerted a surface pressure on the pre-dewatered nonwoven fabric lying on a first screen in a section which is located between two register rollers which are spaced apart in the running direction of the first screen and which support the first screen.
  • the first screen therefore has a slope between the two register rollers to the deepest point below the screen roller and rises again from here diagonally upwards to the upper vertex of the second register roller.
  • the lower run of an endless second sieve runs parallel to this rising section of the first sieve and is guided around the sieve roller and a rubber roller arranged at a distance therefrom.
  • the screen roller Although a part of the screen roller is thrown out of the water, which has accumulated as a result of the surface pressure above the nonwoven fabric, and is collected and removed with the help of a drip pan, it is located above the second screen up to the point where it is from the nonwoven fabric lifts off, another accumulation of the water that emerged from the nonwoven fabric as a result of the surface pressure. In connection with the lack of surface pressure, this means that the reorientation achieved during surface pressure is sometimes lost again.
  • the second screen is in contact with the nonwoven fabric substantially longer than this could be the screen roll, and although the distance over which the second screen contacts the nonwoven fabric is varied to some extent by changing the depth of deflection of the first screen can, the reorientation achievable with this known method is therefore insufficient.
  • FR-A-2 350 422 It is also known (FR-A-2 350 422) for dewatering the nonwoven fabric formed on a lower wire, in particular a multi-layer paper web, to press a self-contained, revolving upper wire against the upper side of the nonwoven fabric and to previously guide it over a roller, whose jacket has an open surface so that it can absorb water and store it temporarily.
  • a water suction device following the sieve roller in the running direction of the lower wire, which has suction boxes, that water can be sucked through the top wire which, due to the surface pressure which the top wire exerts on the nonwoven fabric in the section abutting a screen contact surface of the suction device exit.
  • Such a dewatering device is not suitable and is also not intended for reorienting the fibers of a pre-dewatered nonwoven fabric.
  • the fibers cannot be reoriented because the water emerging from the nonwoven fabric as a result of the surface pressure is immediately sucked off by means of the suction box.
  • the invention has for its object to provide a method for reorienting the fibers in the top layer of a pre-dewatered nonwoven fabric, that is, to improve the randomness of these fibers and to even out the fiber distribution, which is also effective at different and in particular at high machine speeds.
  • This object is achieved by a method having the features of claim 1.
  • the length of the distance over which the second screen exerts a surface pressure on the nonwoven fabric can be changed and, furthermore, at least a part of the water which has emerged from the nonwoven fabric is forced to pass through the second within the period during which the surface pressure is effective
  • the sieve is discharged through it, on the one hand, the fibers can be given the time required for reorientation at any machine speed and, on the other hand, after the reorientation, but before the second sieve is lifted off the nonwoven fabric, the fibers can be fixed by forcibly removing the water , so that the reorientation achieved cannot be lost in whole or in part.
  • the forced removal of the water emerging from the nonwoven fabric under the influence of the surface pressure through the second sieve also prevents that the fiber layer achieved is changed again by water drops, which may hit the fiber fleece.
  • the water discharged upwards through the second sieve is expediently separated from entrained air, so that water and air can then be discharged separately from one another.
  • the invention is also based on the object of providing a device for carrying out the method according to the invention.
  • This object is achieved by a device having the features of claim 3.
  • the surface pressure introduced by the screen roller is continued in this device thanks to the screen contact surface of the water suction device.
  • the distance over which the surface pressure is effective can be adapted to the requirements.
  • the fixation of the reoriented fibers is also ensured, since the water suction device forcibly discharges the water through the second sieve even within the area in which the surface pressure is effective.
  • the device has the features of claim 4. Not only the time span or distance over which the surface pressure can be maintained can be changed here.
  • the surface pressure of the fleece generated by means of the water suction device can also be set independently of the surface pressure generated by means of the screen roller.
  • the device can therefore be adapted particularly well to different requirements, for which a separate adjustment of the screen roller and the water suction device as well as a common adjustment may be necessary. These adjustment options are also advantageous with regard to the reproducibility of the results. In addition, the adjustment work can be carried out without difficulty.
  • At least one known drainage element can be arranged in the region of the water suction device on the side of the first sieve facing away from it.
  • a device for influencing the uppermost layer of a pre-dewatered nonwoven fabric, which lies on a long wire, not shown, which is guided horizontally in a known manner, has a frame, designated as a whole by 1, in order to be able to be arranged over the long wire and the nonwoven fabric lying thereon that overlaps the fourdrinier sieve from above and, as in the exemplary embodiment, is fastened to the table carrying the fourdrinier sieve or to a foundation.
  • two supports 2 and 3 are provided on each side, which support an upper frame 4, the two side rails of which run at least approximately parallel to the lateral edges of the wire.
  • a support frame 5 engaging between these supports is pivotally mounted with a horizontal axis extending transversely to the longitudinal direction of the fourdrinier wire, the two side rails of which are extended beyond the end remote from the pivot axis.
  • These two mutually parallel extensions are formed by two arms 6 which are firmly connected to the support frame 5 and which, as the figure shows, extend obliquely downwards from the support frame 5 between the two supports 3 and have a bearing 7 on each slide 22 wear for a screen roller whose axis is parallel to the pivot axis of the rocker formed from the support frame 5 and the arms 6.
  • the slides 22 which can be displaced in the longitudinal direction of the arms 6 are displaced in the exemplary embodiment via a spindle which can be driven by a motor 23 and are held in the selected position.
  • one end of a tab 9 is articulated with an axis parallel to the pivot axis of the support frame 5, the other end of which is articulated to a pivot frame 10 pivotably mounted in the upper frame 4.
  • the pivot axis of the pivot frame 10, which lies parallel to the pivot axis of the support frame 5, is provided in the area of the one cross member, while in the area of the other cross member near the two side members, a pneumatic working cylinder 11 acts from below, by means of which the pivoting position of the pivot frame 10 within the pivot range can be set to any value.
  • the swing arm consisting of the support frame 5 and the arms 6 can therefore be pivoted with the aid of the pneumatic working cylinder 11, which makes it possible to press the screening roller 8 more or less strongly against the fleece lying on the fourdrinier wire.
  • a suction box 12 is arranged which is delimited on its underside facing the Fourdrinier sieve by a base plate 13 which has numerous water passage openings and the underside of which forms the contact surface for a second sieve 14 .
  • the lowest point of the slightly cylindrical curved contact surface is approximately in the middle of the base plate. From here, the contact surface rises against the screen roller 8, that is, counter to the direction of travel of the wire, in such a way that the plane defined by this section of the contact surface touches the screen roller 8. Accordingly, the other section of the contact surface of the base plate 13 rises slightly towards the end facing away from the screen roller 8.
  • the suction box 12 has separate drain lines 15 and 16 for water and air. Furthermore, the suction box 12 is attached to the supporting frame 5 in a height-adjustable manner by means of threaded bolts 17.
  • One of the threaded bolts 17 is, as the figure shows, arranged on each side of the suction box 12 near the front or rear edge of its cover, so that not only height adjustment but also inclination adjustment of the suction box is possible with the help of the threaded bolts 17 is, which engage in an adjusting bush in the support frame 5.
  • the second screen 14 is an endless Fourdrinier wire, which is brought up from above in an approximately vertical direction to the screen roller 8 and is then deflected in an approximately horizontal direction. Then the second sieve 14 runs over the underside of the base plate 13, which has the consequence that it has a slightly falling and then a slightly rising course to the lowest point of the underside of the base plate 13.
  • a driven roller 18 carried by the rear supports 2 deflects the second screen 14 upward to a first deflection roller 19 which is arranged above and supported by the frame 4 and which is used to tension the second screen 14 about a distance from its axis of rotation Pivot axis 20 can be pivoted upward by motor.
  • the second screen 14 then runs over a second deflection roller 21, which deflects it back to the screen roller 8.
  • the swing arm and the sieve roller 8 carried by it are adjusted with the aid of the pneumatic working cylinder 11 so that the nonwoven fabric is removed from the sieve roller 8 and the second sieve 14 guided over them experiences a certain compression.
  • a water film is formed on both sides of the fleece, which has a substantially lower consistency than the fiber fleece before it is exposed to the surface pressure between the second-Si -eb 14 and the wire.
  • the suction box 12 is set so that the surface pressure exerted on the nonwoven fabric is also maintained between the screen roller and the base plate 13 of the suction box 12 and in the area of this base plate. Therefore, the water that emerges from the nonwoven fabric under the influence of the surface pressure cannot re-enter the nonwoven after leaving the screen roller 8.
  • the water is partially sucked up through the bottom plate 13 by means of the suction box 12, with the result that the fibers of the top layer, which have been reoriented, are fixed to such an extent that they no longer change their position, specifically even if the surface pressure stops after the fleece has left the area below the base plate 13.
  • the sieve roller 8 and the suction box 12 can be raised or lowered at the same time, whereby the sieve roller and the suction box can be brought back into the same position with respect to the wire without difficulty after lifting that they had previously taken, which makes setting the device much easier.
  • the suction effect of the suction box 12 can be varied in order to suck the water up from the fleece with the required intensity.
  • the fourdrinier sieve is guided in the area below the base plate 13 over at least one known drainage element which discharges the water downwards with adjustable strength.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Artificial Filaments (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Claims (6)

1. Procédé pour changer l'orientation des fibres de la couche limite supérieure d'une nappe de fibres prédéshydratée située sur un premier tamis, dans lequel ta nappe degrés est soumise à une compression surfacique au moyen d'un second tamis venant temporairement, à l'intérieur d'une étendue sélectionnable dans l'installation, sur le côté de la nappe de fibres qui est opposé au premier tamis et qui entoure un tambour de filtrage sur une partie de sa périphérie, caractérisé en ce que sur toute l'étendue sélectionnable, la compression surfacique est maintenue au moyen du second tamis guidé le long d'une surface de guidage et, à l'intérieur d'une période de temps pendant laquelle la compression surfacique agit, au moins une partie de l'eau séparée de la nappe de fibres est évacuée de façon forcée au travers du second tamis.
2. Procédé selon la revendication 1, caractérisé en ce que l'eau évacuée vers le haut au travers du second tamis est séparée de l'air entraîné avec elle et ensuite l'eau et l'air sont évacués séparément l'un de l'autre.
3. Appareil pour la mise en oeuvre du procédé selon la revendication 1, comportant un second tamis sans fin (14) pouvant être appliqué sur la nappe de fibres formée sur un premier tamis et qui est guidé autour d'un tambour de filtrage (8) exerçant la compression surfacique, caractérisé en ce qu'à l'intérieur du second tamis (14) est placé un dispositif d'aspiration d'eau (12) qui comporte une surface de guidage de tamis permettant l'application d'une compression surfacique à la nappe de fibres et en ce que le tambour de filtrage (8) et/ou le dispositif d'aspiration d'eau (12) sont maintenus sur un dispositif porteur (5, 6, 9, 10,11) avec un espacement mutuel réglable dans le sens de déplacement du premier tamis.
4. Appareil selon la revendication 3, caractérisé en ce que le dispositif porteur comporte une coulisse (5, 6) pourvue d'un dispositif de pivotement (9, 10, 11), pouvant être bloquée dans des positions angulaires sélectionnables et sur laquelle est monté le tambour de filtrage (8) et en ce que le dispositif d'aspiration d'eau (12) est relié à la coulisse (5, 6) par l'intermédiaire d'un dispositif de retenue (17) permettant un changement de sa position par rapport à la coulisse (5, 6) et au second tamis (14).
5. Appareil selon la revendication 3 ou 4, caractérisé en ce que le dispositif d'aspiration comporte au moins un caisson d'aspiration (12) qui est pourvu de conduits séparés (15, 16) d'évacuation d'eau et d'air.
6. Appareil selon une des revendications 3 à 5, caractérisé en ce qu'il est prévu, dans la zone du dispositif d'aspiration d'eau (12) et sur le côté du premier tamis qui est opposé à celui-ci, au moins un élément d'assèchement connu.
EP80107179A 1979-12-19 1980-11-19 Procédé pour agir sur une nappe de fibres pré-égouttée sur un tamis, et appareil pour la mise en oeuvre du procédé Expired EP0031445B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107179T ATE12274T1 (de) 1979-12-19 1980-11-19 Verfahren zur beeinflussung eines vorentwaesserten faservlieses auf einem sieb und vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2951183A DE2951183C2 (de) 1979-12-19 1979-12-19 Vorrichtung zur Beeinflussung einer vorentwässerten Fasersuspension
DE2951183 1979-12-19

Publications (2)

Publication Number Publication Date
EP0031445A1 EP0031445A1 (fr) 1981-07-08
EP0031445B1 true EP0031445B1 (fr) 1985-03-20

Family

ID=6088953

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107179A Expired EP0031445B1 (fr) 1979-12-19 1980-11-19 Procédé pour agir sur une nappe de fibres pré-égouttée sur un tamis, et appareil pour la mise en oeuvre du procédé

Country Status (6)

Country Link
US (1) US4370200A (fr)
EP (1) EP0031445B1 (fr)
JP (1) JPS5696989A (fr)
AT (1) ATE12274T1 (fr)
DE (1) DE2951183C2 (fr)
FI (1) FI70148C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688900A1 (fr) 1994-06-17 1995-12-27 Valmet Paper Machinery Inc. Gorge d'entrée dans la zone à double toile d'une section de formage hybride pour une machine à papier

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170091A (ja) * 1984-09-12 1986-04-10 三菱重工業株式会社 紙原料の均一分散装置
WO1992014880A1 (fr) * 1991-02-25 1992-09-03 Ab Nordiska Egoutteurfabriken Dispositif de treillis superieur
CN107268320B (zh) * 2017-06-19 2023-08-08 杭州华旺新材料科技股份有限公司 一种节能环保型水印辊除水雾装置
CN110735351A (zh) * 2019-11-21 2020-01-31 中冶美利云产业投资股份有限公司 一种配有顶网成型器的长网造纸机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1107065B (de) * 1954-07-23 1961-05-18 St Annes Board Mill Co Ltd Langsiebpapiermaschine
DE1147470B (de) * 1954-04-06 1963-04-18 St Annes Board Mill Co Ltd Vorrichtung zum Herstellen von Bahnen aus Papier, Pappe od. dgl.
FR2141385A5 (fr) * 1971-07-01 1973-01-19 Finckh Metalltuch Maschf
DE2531839A1 (de) * 1974-07-18 1976-02-05 Valmet Oy Doppelsiebteil in einer papiermaschine
FR2350422A1 (fr) * 1976-05-04 1977-12-02 Australian Paper Manufacturers Perfectionnements a l'elimination de l'eau de suspensions de fibres
GB2003952A (en) * 1977-09-06 1979-03-21 Beloit Walmsley Ltd Improvements relating to forming machines for paper webs
US4146424A (en) * 1977-06-08 1979-03-27 Beloit Corporation Twin wire former with wire orientation control

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1331313U (fr)
US2890149A (en) * 1949-10-31 1959-06-09 J M Voith G M B H Maschinenfab Method and apparatus for making paper
GB819487A (en) * 1956-05-12 1959-09-02 St Annes Board Mill Co Ltd Improvements in or relating to paper and board making machines
DE1116966B (de) * 1956-06-12 1961-11-09 St Annes Board Mill Co Ltd Langsiebmaschine zum Herstellen von Papier- od. dgl. Faserstoffbahnen
US2977277A (en) * 1957-07-15 1961-03-28 Pusey & Jones Corp Method and apparatus for making a web of fibrous material
US3846232A (en) * 1973-03-23 1974-11-05 Valmet Oy Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll
FI70739C (fi) 1977-04-28 1986-10-06 Valmet Oy Banbildningsenhet vid framstaellning av flerskiktskartong
AU3948178A (en) * 1977-09-06 1980-03-06 Beloit Walmsley Ltd Forming machines for paper webs
JPS5446908A (en) * 1977-09-13 1979-04-13 Beloit Corp Paper web forming apparatus
AT359368B (de) 1978-01-16 1980-11-10 Escher Wyss Gmbh Doppelsiebpapiermaschine
FI64958C (fi) 1978-02-07 1984-02-10 Valmet Oy Banformare med dubbelvira foer en pappersmaskin

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1147470B (de) * 1954-04-06 1963-04-18 St Annes Board Mill Co Ltd Vorrichtung zum Herstellen von Bahnen aus Papier, Pappe od. dgl.
DE1107065B (de) * 1954-07-23 1961-05-18 St Annes Board Mill Co Ltd Langsiebpapiermaschine
FR2141385A5 (fr) * 1971-07-01 1973-01-19 Finckh Metalltuch Maschf
DE2531839A1 (de) * 1974-07-18 1976-02-05 Valmet Oy Doppelsiebteil in einer papiermaschine
FR2350422A1 (fr) * 1976-05-04 1977-12-02 Australian Paper Manufacturers Perfectionnements a l'elimination de l'eau de suspensions de fibres
US4146424A (en) * 1977-06-08 1979-03-27 Beloit Corporation Twin wire former with wire orientation control
GB2003952A (en) * 1977-09-06 1979-03-21 Beloit Walmsley Ltd Improvements relating to forming machines for paper webs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688900A1 (fr) 1994-06-17 1995-12-27 Valmet Paper Machinery Inc. Gorge d'entrée dans la zone à double toile d'une section de formage hybride pour une machine à papier

Also Published As

Publication number Publication date
DE2951183A1 (de) 1981-07-09
FI803923L (fi) 1981-06-20
JPS5696989A (en) 1981-08-05
EP0031445A1 (fr) 1981-07-08
FI70148B (fi) 1986-02-28
US4370200A (en) 1983-01-25
FI70148C (fi) 1990-06-12
ATE12274T1 (de) 1985-04-15
DE2951183C2 (de) 1984-05-10

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