EP0031445A1 - Process for acting upon a pre-drained fibrous tissue on a screen, and device for carrying out the process - Google Patents

Process for acting upon a pre-drained fibrous tissue on a screen, and device for carrying out the process Download PDF

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Publication number
EP0031445A1
EP0031445A1 EP80107179A EP80107179A EP0031445A1 EP 0031445 A1 EP0031445 A1 EP 0031445A1 EP 80107179 A EP80107179 A EP 80107179A EP 80107179 A EP80107179 A EP 80107179A EP 0031445 A1 EP0031445 A1 EP 0031445A1
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EP
European Patent Office
Prior art keywords
screen
water
sieve
screen roller
surface pressure
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.)
Granted
Application number
EP80107179A
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German (de)
French (fr)
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EP0031445B1 (en
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.)
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Application filed by Andreas Kufferath KG, Neue Bruderhaus Maschinenfabrik GmbH filed Critical Andreas Kufferath KG
Priority to AT80107179T priority Critical patent/ATE12274T1/en
Publication of EP0031445A1 publication Critical patent/EP0031445A1/en
Application granted granted Critical
Publication of EP0031445B1 publication Critical patent/EP0031445B1/en
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 influencing a pre-dewatered nonwoven fabric on a screen, in which the nonwoven fabric is temporarily subjected to surface pressure by means of a second screen, and to an apparatus for carrying out such a method.
  • a surface pressure is exerted on a pre-dewatered nonwoven fabric lying on a four-wire screen by means of an eisseur, which either consists of only one screen roller or a screen roller arranged within a self-contained, revolving screen, in order to either watermark the nonwoven fabric to provide or to reorient the top fiber layer for the purpose of equalization.
  • an eisseur which either consists of only one screen roller or a screen roller arranged within a self-contained, revolving screen, in order to either watermark the nonwoven fabric to provide or to reorient the top fiber layer for the purpose of equalization.
  • the invention has for its object to provide a method for influencing the pre-dewatered nonwoven fabric on a sieve and in particular for reorienting the top fiber layer of such a nonwoven fabric, which can better maintain the effect achieved by the pressure treatment of the nonwoven fabric than the known methods.
  • This object is achieved by a method having the features of claim 1.
  • the water is discharged separately from air, because this achieves a better result than when water and air are discharged together.
  • 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 4, since the water suction device arranged within the second sieve in addition to the sieve roller is able, with the help of its sieve contact surface, to continue the compression of the nonwoven fabric coming from the sieve roller and thereby the water squeezed out of the fleece to the extent necessary to suction through the second sieve.
  • the suction device preferably has the features of claim 5, since a suction box is particularly suitable for water drainage and, because of the separate drain lines for water and air, is particularly good and trouble-free Fixation of the fibers is achievable. If water is also to be discharged in the opposite direction, that is to say through the first sieve, then at least one known drainage element need only be arranged opposite the water suction device.
  • both the screen roller and the water suction device are mounted on a support device so as to be adjustable relative to the second screen, preferably in such a way that the distance between the water suction device and the screen roller can also be changed.
  • the surface pressure of the fleece generated by means of the water suction device can then be set independently of the surface pressure generated by means of the screen roller, by means of which the time period in which the fleece is influenced can also be changed. On the other hand, this time period depends on the distance between the water suction device and the screen roller, which can also be changed.
  • the device can therefore be particularly easily adapted to different requirements, which may require a separate adjustment of the screen roller and the water suction device as well as a common adjustment.
  • a structurally particularly simple design of the carrying device consists in providing a rocker provided with a swivel device and lockable in a selectable swivel position, in which the screen roller is preferably slidably mounted. For such adjustment of the screen roller, the rocker and, optionally, the screen roller is thus moved relative to the swing arm.
  • the water suction device is connected to the rocker arm by means of a holding device which permits a change in its position relative to the rocker arm and possibly to the screen roller, so that the screen roller and suction device can also be adjusted independently of one another.
  • a device for influencing the top layer of a previously dewatered fibrous web, which lies on a non g represents estell- th in a known manner horizontally guided wire has to be placed over the Langs.ieb and lying on it non-woven fabric to an as Entire with 1 frame, which 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 to carry for a screen roller, the axis of which 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 bar, while in the area of the other cross bar near the two side bars each a pneumatic working cylinder 11 acts from below, by means of which the pivot 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 cylinders 11, which makes it possible to press the screen 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 screen 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 a height adjustment but also an inclination adjustment of the suction box is possible with the help of the threaded bolts 17 is, which engage in an adjustment sleeve in the support frame 5.
  • the second screen 14 is an endless Fourdrinier wire, which is brought up to the screen roller 8 from above in an approximately vertical direction and is then deflected in an approximately horizontal direction. Then the second sieve 14 runs over the underside of the bottom 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 bottom 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 sieve 14 then runs over a second order Steering roller 21, which redirects it 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.
  • the result of this is that 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 sieve 14 and the wire.
  • the suction box 12 is adjusted so that the surface pressure exerted on the nonwoven fabric is also maintained between the screen roller and the bottom plate 13 of the suction box 12 and in the area of this bottom 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 by means of the suction box 12 through the bottom plate 13, with the result that the fibers of the top layer, which have been reoriented, are fixed so far 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 screen roller 8 and the suction box 12 can be raised or lowered at the same time, whereby the screen roller and the suction box can be brought back into the same position with respect to the wire without difficulty after lifting that they have previously taken, which is essential to the setting of the device facilitated.
  • 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 previously known drainage element which discharges the water downwards with adjustable strength.

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

Abstract

A method and apparatus are disclosed for influencing the fibers in the uppermost layer of a fibrous web lying on a screen, for example, in applying a watermark or evening the surface of the web, wherein a surface compression is exerted on the web by a screen roller and a second screen guided around the screen roller. The surface compression is maintained over a variable time period and causes a water film to appear on the upper surface of the web, in which the fiber density is much less than in the web prior to the surface compression. This water layer is forcibly aspirated from the web and the fibers therein thus experience a reorientation and become set in desired positions.

Description

Die Erfindung betrifft ein Verfahren zur Beeinflussung eines vorentwässerten Faservlieses auf einem Sieb, bei dem das Faservlies mittels eines zweiten Siebes vorübergehend einer Flächenpressung ausgesetzt wird, sowie eine Vorrichtung zur Durchführung eines solchen Verfahrens.The invention relates to a method for influencing a pre-dewatered nonwoven fabric on a screen, in which the nonwoven fabric is temporarily subjected to surface pressure by means of a second screen, and to an apparatus for carrying out such a method.

Bei den bekannten Verfahren dieser Art wird mittels eines Egoutteurs, der entweder nur aus einer Siebwalze oder einer innerhalb eines in sich geschlossenen, umlaufenden Siebes angeordneten Siebwalze besteht, auf ein auf einem Langsieb liegendes, vorentwässertes Faservlies eine Flächenpressung ausgeübt, um entweder das Faservlies mit Wasserzeichen zu versehen oder um eine Umorientierung der obersten Faserschicht zum Zwecke einer Vergleichmäßigung zu bewirken. Nachteilig ist bei diesen Verfahren, daß die Zone, in welcher die Flächenpressung erfolgt, nicht frei wählbar ist, sondern einerseits von der Maschinengeschwindigkeit und andererseits vom Durchmesser der Egoutteur-Walze abhängt,dem Grenzen gesetzt sind, Ein weiterer wesentlicher Nachteil der bekannten Verfahrens besteht darin, daß die Fixierung der umorientierten Fasern lediglich dadurch erfolgt, daß sich die Siebwalze oder das zusammen mit ihr umlaufende Sieb wieder vom Faservlies trennt. Dabei kann aber die erzielte Umorientierung wieder teilweise rückgängig gemacht werden. Überdies entstehen, insbesondere bei hohen Maschinengeschwindigkeiten, dadurch Schwierigkeiten, daß ein Teil des Wassers in dem Gewebe der Egoutteur-Walze oder des Siebes zunächst verbleibt und dann in Form von Tropfen abgeschleudert wird, welche auf das soeben umorientierte Faservlies treffen und dadurch ebenfalls die erzielte Faserlage wieder verändern.In the known methods of this type, a surface pressure is exerted on a pre-dewatered nonwoven fabric lying on a four-wire screen by means of an egoutteur, which either consists of only one screen roller or a screen roller arranged within a self-contained, revolving screen, in order to either watermark the nonwoven fabric to provide or to reorient the top fiber layer for the purpose of equalization. The disadvantage of this method is that the zone in which the surface pressure is applied cannot be freely selected, but depends on the one hand on the machine speed and on the other hand on the diameter of the roller, which are subject to limits. Another major disadvantage of the known methods is that that the fixation of the reoriented fibers only takes place in that the screen roller or the screen running with it separates again from the nonwoven fabric. However, the reorientation achieved can be partially reversed. Moreover, especially at high machine speeds, difficulties arise because a part of the water initially remains in the fabric of the egoutteur roller or the sieve and is then spun off in the form of drops which hit the fiber fleece which has just been reoriented and thereby also the fiber position achieved change again.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Beeinflussung des vorentwässerten Faservlieses auf einem Sieb und insbesondere zur Umorientierung der obersten Faserschicht eines solchen Vlieses zu schaffen, das besser als die bekannten Verfahren die durch die Druckbehandlung des Faservlieses erreichte Wirkung aufrechtzuerhalten vermag. Diese Aufgabe löst ein Verfahren mit den Merkmalen des Anspruches 1.The invention has for its object to provide a method for influencing the pre-dewatered nonwoven fabric on a sieve and in particular for reorienting the top fiber layer of such a nonwoven fabric, which can better maintain the effect achieved by the pressure treatment of the nonwoven fabric than the known methods. This object is achieved by a method having the features of claim 1.

Dadurch, daß während der Zeitspanne, in der das Faservlies einer Flächenpressung ausgesetzt ist, zwangsweise zumindest ein Teil des unter dem Einfluß der Flächenpressung aus dem Faservlies ausgetretenen Wassers abgeführt wird, und zwar zumindest zum Teil durch das zweite Sieb hindurch, wird eine zuverlässige Fixierung der Fasern erreicht. Die wählbare Zeitspanne, während deren die Flächenpressung aufrechtgehalten wird, ermöglicht dabei die Anpassung an unterschiedliche Maschinengeschwindigkeiten, weshalb das erfindungsgemäße Verfahren auch bei den höchsten Maschinengeschwindigkeiten anwendbar und voll wirksam ist. Vorteilhaft ist schließlich auch, daß das erfindungsgemäße Verfahren nicht darauf beschränkt ist, eine Umorientierung der obersten Faserschicht zu deren Vergleichmäßigung zu erzielen oder ein Wasserzeichen zu bilden. Das Abführen des Wassers durch das zweite Sieb hindurch, zu dem selbstverständlich auch ein gleichzeitiges Abführen des Wassers in der entgegengesetzten Richtung, also durch das erste Sieb hindurch, treten kann, sowie die wählbare Intensität der Wasserabfuhr lassen das erfindungsgemäße Verfahren auch mit Vorteil dann anwenden, wenn zusätzliche Masse wie Fasern oder Hilfsstoffe auf die oberste Faserschicht aufgebracht oder in sie eingebracht werden soll.Characterized in that during the period in which the nonwoven fabric is exposed to a surface pressure, at least some of the water which has exited from the nonwoven fabric under the influence of the surface pressure is forcibly discharged, at least partially through the second sieve, a reliable fixation of the Fibers reached. The selectable time period during which the surface pressure is maintained enables adaptation to different machine speeds, which is why the method according to the invention can be used and is fully effective even at the highest machine speeds. Finally, it is also advantageous that the method according to the invention is not restricted to realigning the uppermost fiber layer in order to make it uniform or to form a watermark. The removal of the water through the second sieve, to which a simultaneous removal of the water in the opposite direction, that is to say through the first sieve, can of course also occur, and the selectable intensity of the water removal can also be used to advantage in the method according to the invention, if additional mass such as fibers or auxiliaries is to be applied to or introduced into the uppermost fiber layer.

Besonders gute Ergebnisse lassen sich dann erzielen, wenn die Flächenpressung von oben her auf das Faservlies aufgebracht und zumindest ein Teil des ausgepressten Wassers zwangsweise nach oben abgeführt wird.Particularly good results can be achieved if the surface pressure is applied to the nonwoven fabric from above and at least part of the squeezed water is forcibly discharged upwards.

Bei einer bevorzugten Ausführungsform wird das Wasser getrennt von Luft abgeführt, weil hierdurch ein besseres Ergebnis als bei einer gemeinsamen Abführung von Wasser und Luft erzielt wird.In a preferred embodiment, the water is discharged separately from air, because this achieves a better result than when water and air are discharged together.

Der Erfindung liegt auch die Aufgabe zugrunde, eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens zu schaffen. Diese Aufgabe löst eine Vorrichtung mit den Merkmalen des Anspruches 4, da die innerhalb des zweiten Siebes zusätzlich zu der Siebwalze angeordnete Wasserabsaugvorrichtung in der Lage ist, mit Hilfe ihrer Siebanlagefläche die Komprimierung des von der Siebwalze kommenden Faservlieses fortzusetzen und dabei das aus dem Vlies ausgepresste Wasser im erforderlichen Umfange durch das zweite Sieb hindurch abzusaugen.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 4, since the water suction device arranged within the second sieve in addition to the sieve roller is able, with the help of its sieve contact surface, to continue the compression of the nonwoven fabric coming from the sieve roller and thereby the water squeezed out of the fleece to the extent necessary to suction through the second sieve.

Vorzugsweise weist die Absaugvorrichtung die Merkmale des Anspruches 5 auf, da ein Saugkasten für die Wasserabfuhr besonders geeignet ist und durch die getrennten Abflußleitungen für Wasser und Luft eine besonders gute und störungsfreie Fixierung der Fasern erreichbar ist. Soll auch Wasser in der entgegengesetzten Richtung, also durch das erste Sieb hindurch, abgeführt werden, dann braucht nur der Wasserabsaugvorrichtung gegenüberliegend wenigstens ein bekanntes Entwässerungselement angeordnet zu werden.The suction device preferably has the features of claim 5, since a suction box is particularly suitable for water drainage and, because of the separate drain lines for water and air, is particularly good and trouble-free Fixation of the fibers is achievable. If water is also to be discharged in the opposite direction, that is to say through the first sieve, then at least one known drainage element need only be arranged opposite the water suction device.

Bei einer bevorzugten Ausführungsform sind sowohl die Siebwalze als auch die Wasserabsaugvorrichtung relativ zum zweiten Sieb verstellbar an einer Tragvorrichtung gehaltert,und zwar vorzugsweise so, daß auch der Abstand zwischen der Wasserabsaugvorrichtung und der Siebwalze geändert werden kann. Es kann dann die mittels der Wasserabsaugvorrichtung erzeugte Flächenpressung des Vlieses unabhängig von der mittels der Siebwalze erzeugten Flächenpressung eingestellt werden, durch die auch die Zeitspanne verändert werden kann, in der das Vlies beeinflusst wird. Diese Zeitspanne ist andererseits vom Abstand zwischen Wasserabsaugvorrichtung und Siebwalze abhängig, der ebenfalls verändert werden kann. Die Vorrichtung kann daher besonders einfach an unterschiedliche Erfordernisse angepaßt werden, wozu eine separate Verstellung der Siebwalze und der Wasserabsaugvorrichtung ebenso wie eine gemeinsame Verstellung notwendig sein kann. Auch hinsichtlich der Reproduzierbarkeit der Ergebnisse sind diese Verstellmöglichkeiten von Vorteil. Eine konstruktiv besonders einfache Ausbildung der Tragvorrichtung besteht darin, eine mit einer Schwenkvorrichtung versehene und in wählbarer Schwenklage feststellbare Schwinge vorzusehen, in welcher die Siebwalze vorzugsweise verschiebbar gelagert ist. ZurzEinstellung der Siebwalze wird also die Schwinge und gegebenenfalls die Siebwalze relativ zur Schwinge bewegt. Die Wasserabsaugvorrichtung ist dabei über eine eine Veränderung ihrer Lage relativ zur Schwinge und gegebenenfalls zur Siebwalze gestattende Haltevorrichtung mit der Schwinge verbunden, so daß Siebwalze und Absaugvorrichtung auch unabhängig voneinander verstellt werden können.In a preferred embodiment, both the screen roller and the water suction device are mounted on a support device so as to be adjustable relative to the second screen, preferably in such a way that the distance between the water suction device and the screen roller can also be changed. The surface pressure of the fleece generated by means of the water suction device can then be set independently of the surface pressure generated by means of the screen roller, by means of which the time period in which the fleece is influenced can also be changed. On the other hand, this time period depends on the distance between the water suction device and the screen roller, which can also be changed. The device can therefore be particularly easily adapted to different requirements, which may require a separate adjustment of the screen roller and the water suction device as well as a common adjustment. These adjustment options are also advantageous with regard to the reproducibility of the results. A structurally particularly simple design of the carrying device consists in providing a rocker provided with a swivel device and lockable in a selectable swivel position, in which the screen roller is preferably slidably mounted. For such adjustment of the screen roller, the rocker and, optionally, the screen roller is thus moved relative to the swing arm. The water suction device is connected to the rocker arm by means of a holding device which permits a change in its position relative to the rocker arm and possibly to the screen roller, so that the screen roller and suction device can also be adjusted independently of one another.

Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Die einzige Figur zeigt eine Seitenansicht des Ausführungsbeispiels.The invention is explained in detail below using an exemplary embodiment shown in the drawing. The single figure shows a side view of the embodiment.

Eine Vorrichtung zur Beeinflussung der obersten Schicht eines vorentwässerten Faservlieses, das auf einem nicht dargestell- ten, in bekannter Weise horizontal geführten Langsieb liegt, weist, um über dem Langs.ieb und dem auf ihm liegenden Faservlies angeordnet werden zu können, ein als Ganzes mit 1 bezeichnetes Gestell auf, das das Langsieb von oben her übergreift und, wie im Ausführungsbeispiel, an dem das Langsieb tragenden Tisch oder an einem Fundament befestigt wird. Am vorderen und hinteren Ende des Gestelles 1 sind seitlich je zwei Stützen 2 und 3 vorgesehen, die einen oberen Rahmen 4 tragen, dessen beide Seitenholme zumindest annähernd parallel zu den seitlichen Rändern des Langsiebes verlaufen.A device for influencing the top layer of a previously dewatered fibrous web, which lies on a non g represents estell- th in a known manner horizontally guided wire has to be placed over the Langs.ieb and lying on it non-woven fabric to an as Entire with 1 frame, which 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. At the front and rear end of the frame 1, 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.

An den beiden in Laufrichtung des Langsiebes stromabwärts stehenden Stützen 2 ist ein zwischen diese Stützen eingreifender Tragrahmen 5 mit horizontaler und quer zur Längsrichtung des Langsiebes verlaufender Achse schwenkbar gelagert, dessen beide Seitenholme über das von der Schwenkachse entfernte Ende hinaus verlängert sind. Diese beiden zueinander parallelen Verlängerungen werden durch zwei fest mit dem Tragrahmen 5 verbundene Arme 6 gebildet, die, wie die Figur zeigt, vom Tragrahmen 5 aus sich schräg nach unten zwischen die beiden Stützen 3 hinein erstrecken und auf je einem Schlitten 22 je ein Lager 7 für eine Siebwalze zu tragen, deren Achse parallel zur Schwenkachse der aus dem Tragrahmen 5 und den Armen 6 gebildeten Schwinge liegt. Die in Längsrichtung der Arme 6 verschiebbaren Schlitten 22 werden im Ausführungsbeispiel über je eine von einem Motor 23 antreibbare Spindel verschoben und in der gewählten Position festgehalten.On the two supports 2 standing downstream in the running direction of the fourdrinier 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 to carry for a screen roller, the axis of which 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.

An das durch die Arme 6 verlängerte Ende der beiden Seitenholme des Tragrahmens 5 ist je das eine Ende einer Lasche 9 mit zur Schwenkachse des Tragrahmens 5 paralleler Achse angelenkt, deren anderes Ende an einen im oberen Rahmen 4 schwenkbar gelagerten Schwenkrahmen 10 angelenkt ist. Die parallel zur Schwenkachse des Tragrahmens 5 liegende Schwenkachse des Schwenkrahmens 10 ist im Bereich des einen Querholms vorgesehen, während im Bereich des anderen Querholms nahe der beiden Seitenholme von unten her je ein pneumatischer Arbeitszylinder 11 angreift, mittels dessen die Schwenklage des Schwenkrahmens 10 innerhalb des Schwenkbereiches auf jeden beliebigen Wert eingestellt werden kann. Die aus dem Tragrahmen 5 und den Armen 6 bestehende Schwinge kann deshalb mit Hilfe der pneumatischen Arbeitszylinder 11 geschwenkt werden, wodurch es möglich ist, die Siebwalze 8 mehr oder weniger stark gegen das auf dem Langsieb liegende Vlies zu pressen.At the end of the two side rails of the support frame 5, which end is extended by the arms 6, 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 bar, while in the area of the other cross bar near the two side bars each a pneumatic working cylinder 11 acts from below, by means of which the pivot 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 cylinders 11, which makes it possible to press the screen roller 8 more or less strongly against the fleece lying on the fourdrinier wire.

In dem Bereich zwischen den beiden Armen 6 einerseits und den hinteren Stützen 2 andererseits ist ein Saugkasten 12 angeordnet, der auf seiner dem Langsieb zugekehrten Unterseite von einer Bodenplatte 13 begrenzt ist, die zahlreiche Wasserdurchtrittsöffnungen hat und deren Unterseite die Anlagefläche für ein zweites Sieb 14 bildet. Wie die Figur zeigt, liegt die tiefste Stelle der leicht zylindrisch gekrümmten Anlagefläche etwa in der Mitte der Bodenplatte. Von hier aus steigt die Anlagefläche gegen die Siebwalze 8 hin, also entgegen der Laufrichtung des Langsiebes, an, und zwar so, daß die durch diesen Abschnitt der Anlagefläche definierte Ebene die Siebwalze 8 tangiert. Entsprechend steigt der andere Abschnitt der Anlagefläche der Bodenplatte 13 zu dem der Siebwalze 8 abgekehrten Ende hin etwas an.In the area between the two arms 6 on the one hand and the rear supports 2 on the other hand, a suction box 12 is arranged which is delimited on its underside facing the Fourdrinier screen 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 . As the figure shows, 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.

Der Saugkasten 12 hat getrennte Abflußleitungen 15 und 16 für Wasser bzw. für Luft. Ferner ist der Saugkasten 12 mittels Gewindebolzen 17 höhenverstellbar an den Tragrahmen 5 angehängt. Je einer der Gewindebolzen 17 ist, wie die Figur zeigt, an jeder Seite des Saugkastens 12 nahe dem vorderen bzw. dem hinteren Rand von dessen Deckel angeordnet, so daß nicht nur eine Höhenverstellung, sondern auch eine Neigungsverstellung des Saugkastens mit Hilfe der Gewindebolzen 17 möglich ist, die in je eine Verstellbuchse im Tragrahmen 5 eingreifen.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 a height adjustment but also an inclination adjustment of the suction box is possible with the help of the threaded bolts 17 is, which engage in an adjustment sleeve in the support frame 5.

Das zweite Sieb 14 ist ein endloses Langsieb, das von oben her in etwa vertikaler Richtung an die Siebwalze 8 herangeführt wird und dann in eine annähernd horizontale Richtung umgelenkt wird. Sodann läuft das zweite Sieb 14 über die Unterseite der Bodenplatte 13, was zur Folge hat, daß es bis zu der am tiefsten liegenden Stelle der Unterseite der Bodenplatte 13 einen leicht fallenden und danach einen leicht ansteigenden Verlauf hat. Eine von den hinteren Stützen 2 getragene, angetriebene Walze 18 lenkt das zweite Sieb 14 nach oben um zu einer ersten, oberhalb des Rahmens 4 angeordneten und von diesem getragene Umlenkwalze 19, die zum Spannen des zweiten Siebes 14 um eine im Abstand von ihrer Drehachse liegende Schwenkachse 20 nach oben motorisch geschwenkt werden kann. Anschließend läuft das zweite Sieb 14 über eine zweite Umlenkwalze 21, die es wieder zur Siebwalze 8 umlenkt.The second screen 14 is an endless Fourdrinier wire, which is brought up to the screen roller 8 from above in an approximately vertical direction and is then deflected in an approximately horizontal direction. Then the second sieve 14 runs over the underside of the bottom 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 bottom 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 sieve 14 then runs over a second order Steering roller 21, which redirects it to the screen roller 8.

Wenn beispielsweise mit Hilfe dieser Vorrichtung eine Vergleichmäßigung der obersten Faserschicht eines auf dem Langsieb der Papiermaschine liegenden Faservlieses vorgenommen werden soll, wird mit Hilfe der pneumatischen Arbeitszylinder 11 die Schwinge und die von ihr getragene Siebwalze 8 so eingestellt, daß das Faservlies von der Siebwalze 8 und dem über sie geführten zweiten Sieb 14 eine gewisse Kompression erfährt. Dies hat zur Folge, daß sich auf beiden Seiten des Vlieses ein Wasserfilm bildet, der eine wesentlich niedrigere Stoffdichte aufweist als das Faservlies, ehe es zwischen dem zweiten Sieb 14 und dem Langsieb der Flächenpressung ausgesetzt wird. Durch die Herabsetzung der Stoffdichte erhalten die Fasern der Vliesoberfläche so viel Bewegungsfreiheit, daß sie sich umorientieren können.If, for example, with the aid of this device, the uppermost fiber layer of a nonwoven fabric lying on the Fourdrinier of the paper machine is to be made, 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. The result of this is that 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 sieve 14 and the wire. By reducing the fabric density, the fibers of the nonwoven surface are given so much freedom of movement that they can reorient.

Der Saugkasten 12 wird so eingestellt, daß die auf das Faservlies ausgeübte Flächenpressung auch zwischen der Siebwalze und der Bodenplatte 13 des Saugkastens 12 sowie im Bereich dieser Bodenplatte aufrechterhalten bleibt. Daher kann das Wasser, das aus dem Faservlies unter dem Einfluß der Flächenpressung austritt, nicht nach dem Verlassen der Siebwalze 8 wieder in das Vlies eintreten. Das Wasser wird teilweise mittels des Saugkastens 12 durch die Bodenplatte 13 hindurch nach oben abgesaugt, was zur Folge hat, daß die Fasern der obersten Schicht, die sich umorientiert haben, so weit fixiert werden, daß sie nunmehr ihre Lage nicht mehr verändern, und zwar auch dann nicht mehr, wenn die Flächenpressung aufhört, nachdem das Vlies den Bereich unterhalb der Bodenplatte 13 verlassen hat.The suction box 12 is adjusted so that the surface pressure exerted on the nonwoven fabric is also maintained between the screen roller and the bottom plate 13 of the suction box 12 and in the area of this bottom 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 by means of the suction box 12 through the bottom plate 13, with the result that the fibers of the top layer, which have been reoriented, are fixed so far 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.

Durch ein Schwenken der aus dem Tragrahmen 5 und dem Rahmen 6 bestehenden Schwinge können gleichzeitig die Siebwalze 8 und der Saugkasten 12 angehoben oder abgesenkt werden, wodurch die Siebwalze und der Saugkasten nach einem Abheben ohne Schwierigkeiten wieder in die gleiche Position bezüglich des Langsiebes gebracht werden können, die sie zuvor eingenommen haben, was die Einstellung der Vorrichtung wesentlich erleichtert. Die Saugwirkung des Saugkastens 12 kann variiert werden, um mit der erforderlichen Intensität das Wasser vom Vlies nach oben abzusaugen.By pivoting the rocker consisting of the support frame 5 and the frame 6, the screen roller 8 and the suction box 12 can be raised or lowered at the same time, whereby the screen roller and the suction box can be brought back into the same position with respect to the wire without difficulty after lifting that they have previously taken, which is essential to the setting of the device facilitated. 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.

Sofern es erforderlich oder zweckmäßig ist, das Wasser auch nach unten abzusaugen, wird das Langsieb im Bereich unterhalb der Bodenplatte 13 über mindestens ein vorbekanntes Entwässerungselement geführt, welches das Wasser nach unten mit einstellbarer Stärke abführt.If it is necessary or expedient to also suck off the water downwards, the fourdrinier sieve is guided in the area below the base plate 13 over at least one previously known drainage element which discharges the water downwards with adjustable strength.

Claims (9)

1. Verfahren zur Beeinflussung eines vorentwässerten Faservlieses auf einem Sieb, bei dem das Faservlies mittels eines zweiten Siebes einer Flächenpressung ausgesetzt wird, dadurch gekennzeichnet, daß die Flächenpressung über eine wählbare Zeitspanne aufrechtgehalten wird und während dieser Zeitspanne von dem unter dem Einfluß der Flächenpressung aus dem Faservlies ausgetretenen Wasser zumindest ein Teil zwangsweise durch das zweite Sieb hindurch abgeführt wird.1. A method for influencing a pre-dewatered nonwoven fabric on a sieve, in which the nonwoven fabric is exposed to a surface pressure by means of a second sieve, characterized in that the surface pressure is maintained for a selectable period of time and during this period of time under the influence of the surface pressure from the Fiber fleece leaked water is at least partially forcibly discharged through the second sieve. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Flächenpressung von oben her auf das Faservlies aufgebracht wird und zumindest ein Teil des ausgepressten Wassers zwangsläufig nach oben abgeführt wird.2. The method according to claim 1, characterized in that the surface pressure is applied from above to the nonwoven fabric and at least part of the squeezed water is inevitably discharged upwards. 3. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Wasser getrennt von der Luft abgeführt wird.3. The method according to claim 2 or 3, characterized in that the water is removed separately from the air. 4. Vorrichtung zur Durchführung des Verfahrens gemäß Anspruch 1 mit einem an das auf einem ersten Sieb gebildete Faservlies anpreßbaren zweiten, in sich geschlossenen Sieb, das um eine Siebwalze herumgeführt ist und dessen Länge größer ist als der Umfang der Siebwalze, dadurch gekennzeichnet, daß das zweite Sieb (14) auch um eine Wasserabsaugvorrichtung (12) herumgeführt ist, die eine die von der Siebwalze (8) einge- leitete Flächenpressung fortsetzende Siebanlagefläche aufweist.4. Apparatus for carrying out the method according to claim 1 with a pressable to the nonwoven formed on a first screen second, self-contained screen, which is guided around a screen roller and whose length is greater than the circumference of the screen roller, characterized in that second wire (14) is also guided around a water suction device (12), the one that is of the screen roller (8) - has led surface pressure continuing Siebanlagefläche. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Absaugvorrichtung wenigstens einen Saugkasten (12) aufweist, der getrennte Abflußleitungen (15,16) für Wasser und Luft hat.5. The device according to claim 4, characterized in that the suction device has at least one suction box (12) which has separate drain lines (15, 16) for water and air. 6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß im Bereich der Wasserabsaugvorrichtung (12) auf der ihr abgekehrten Seite des ersten Siebes ebenfalls wenigstens ein vorbekanntes Entwässerungselement angeordnet ist.6. The device according to claim 4 or 5, characterized in that in the area of the water suction device (12) on the side facing away from the first screen also little least a known drainage element is arranged. 7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Siebwalze (8) und/oder die Wasserabsaugvorrichtung (12) relativ zum zweiten Sieb (14) verstellbar an einer Tragvorrichtung (5,6,9,10,11) gehaltert sind.7. Device according to one of claims 4 to 6, characterized in that the screen roller (8) and / or the water suction device (12) relative to the second screen (14) adjustable on a support device (5,6,9,10,11) are supported. 8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß die Siebwalze (8) und/oder die Wasserabsaugvorrichtung (12) mit verstellbarem Abstand voneinander an der Tragvorrichtung (5,6,9,10,11) gehaltert sind.8. Device according to one of claims 4 to 7, characterized in that the screen roller (8) and / or the water suction device (12) are held at an adjustable distance from each other on the support device (5,6,9,10,11). 9. Vorrichtung nach Anspruch 7 oder 8,dadurch gekennzeichnet, daß die Tragvorrichtung eine mit einer Schwenkvorrichtung (9,10,11) versehene und in wählbarer Schwenkstellung feststellbare Schwinge (5,6) aufweist, an welcher die Siebwalze (8) gelagert ist, und daß die Wasserabsaugvorrichtung (12) über eine eine Veränderung ihrer Lage relativ zur Schwinge und zum zweiten Sieb gestattende Haltevorrichtung (17) mit der Schwinge verbunden ist.9. Apparatus according to claim 7 or 8, characterized in that the carrying device has a swing arm (5, 6) provided with a swivel device (9, 10, 11) and lockable in a selectable swivel position, on which the screen roller (8) is mounted, and that the water suction device (12) is connected to the rocker arm via a holding device (17) which permits a change in its position relative to the rocker arm and to the second sieve.
EP80107179A 1979-12-19 1980-11-19 Process for acting upon a pre-drained fibrous tissue on a screen, and device for carrying out the process Expired EP0031445B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107179T ATE12274T1 (en) 1979-12-19 1980-11-19 METHOD FOR INFLUENCE A PRE-DEWATERED FIBER WEB ON A SCREEN AND DEVICE FOR CARRYING OUT THE METHOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2951183 1979-12-19
DE2951183A DE2951183C2 (en) 1979-12-19 1979-12-19 Device for influencing a pre-drained fiber suspension

Publications (2)

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EP0031445A1 true EP0031445A1 (en) 1981-07-08
EP0031445B1 EP0031445B1 (en) 1985-03-20

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EP80107179A Expired EP0031445B1 (en) 1979-12-19 1980-11-19 Process for acting upon a pre-drained fibrous tissue on a screen, and device for carrying out the process

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US (1) US4370200A (en)
EP (1) EP0031445B1 (en)
JP (1) JPS5696989A (en)
AT (1) ATE12274T1 (en)
DE (1) DE2951183C2 (en)
FI (1) FI70148C (en)

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CN110735351A (en) * 2019-11-21 2020-01-31 中冶美利云产业投资股份有限公司 fourdrinier paper-making machine with top-wire former

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Also Published As

Publication number Publication date
FI70148B (en) 1986-02-28
DE2951183C2 (en) 1984-05-10
FI803923L (en) 1981-06-20
DE2951183A1 (en) 1981-07-09
ATE12274T1 (en) 1985-04-15
EP0031445B1 (en) 1985-03-20
FI70148C (en) 1990-06-12
JPS5696989A (en) 1981-08-05
US4370200A (en) 1983-01-25

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