EP0761874A2 - Device for making multilayer paper or cardboard - Google Patents

Device for making multilayer paper or cardboard Download PDF

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Publication number
EP0761874A2
EP0761874A2 EP96112594A EP96112594A EP0761874A2 EP 0761874 A2 EP0761874 A2 EP 0761874A2 EP 96112594 A EP96112594 A EP 96112594A EP 96112594 A EP96112594 A EP 96112594A EP 0761874 A2 EP0761874 A2 EP 0761874A2
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EP
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Prior art keywords
sieve
forming
strips
screen
angle
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Granted
Application number
EP96112594A
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German (de)
French (fr)
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EP0761874B1 (en
EP0761874A3 (en
Inventor
Heinz Steckenreuter
Helmut Stoerr
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Voith Patent GmbH
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Voith Sulzer Papiermaschinen GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a device for producing a multilayer paper or cardboard according to the preamble of claim 1.
  • Devices of this type have the advantage that the layers can be formed separately. However, this can lead to so-called gap strength problems, in particular in the case of multilayer cardboard, i.e. to problems regarding the adhesion between the layers.
  • the attached twin wire formers are also very complex, both in terms of the device, as well as the space and energy requirements.
  • the invention is therefore based on the object of creating a device of the type mentioned at the outset in which the advantages of influencing the formation, the high gap strength and the ply bond can be achieved with relatively little effort.
  • the device according to the invention has the essential advantage that the forming roll ensures optimum sheet formation and, due to the centrifugal forces in the forming roll area, the fine substances which support the rubber effect are brought very early to the later rubber side of the upper layer.
  • the subsequent, relatively steep downward double-wire section with forming strips favors the removal of water. You can work on the strips completely without or with little negative pressure, since the falling water essentially only has to be redirected.
  • the former is easy to regulate and requires little energy. So it is achieved with relatively simple means that when bringing together the upper and lower layers establish a high gap strength without the formation being adversely affected.
  • the forming strips in the downward part of the twin wire former can be attached to one or both sides. As is known, such strips are pressed against the sieves in such a way that they change their course. This results in pressure and suction on the fiber suspension layer between the sieves.
  • the fine substances important for gushing can be concentrated in the side of the upper layer that will later be used for gushing by means of controlled negative pressure and / or sensitively adjustable forming strips on the outer screen.
  • a reduced L / Q ratio can be generated by forming roll dewatering, that is the strength ratio of the dry web, measured lengthways, in relation to the cross-measured strength.
  • FIG. 1 shows an example of a twin wire former 3 belonging to the device according to the invention.
  • An inner wire 4 and an outer wire 5 are brought together in the area of the forming roller 8. Introduces into this area of the gusset Headbox 1 a suspension jet 9.
  • the two screens 4 and 5 and the suspension layer located between them are dewatered on the forming roller 8 essentially in the course of the wrap angle ⁇ . Part of the water can be thrown through the outer sieve 5 into the water pan 14.
  • the twin wire is then guided tangentially away from the forming roller 8, it essentially having a downward direction.
  • forming strips 10 and 11 are attached on both sides, ie in the inner wire 4 and in the outer wire 5. However, strips on both sides are not always necessary.
  • strips 11 mounted in the outer sieve 5 can be made movable and elastically supported towards the sieve.
  • the water passing through the sieves on the strips is collected in water tanks 12 and 13, respectively.
  • the water pan 12 located in the inner sieve 4 can be provided with a negative pressure. This additional effort is only necessary in special cases.
  • the two sieves are separated, the fiber layer being held on the inner sieve 4 and, when deflected, deposited on the lower layer 7 formed on the primary longitudinal sieve 2 via the deflecting roller 15.
  • the resulting multi-layer web remains on the primary longitudinal screen 2, while the inner screen 4 is lifted off and returned to the forming roller 8.
  • a suction box 16 can favor the holding of the layers on the primary longitudinal screen 2.
  • Fig. 2 the headbox 1 and 1 'is shown very schematically in two extreme positions. It can be seen that the surface normal N is drawn on the beam 9, which forms a plane. This surface normal N takes the angle ⁇ to the vertical V1 (left side of the figure). The right side of the figure shows a perpendicularly formed suspension beam 9 ', the normal N' of which forms an angle ⁇ 'to the vertical V1.
  • the sector 12 is shown in FIG. 3. It is limited by an angle ⁇ with respect to the vertical V2 inwards and by an angle ⁇ 'with respect to the vertical V2 outwards.
  • the two screens 4 and 5 are to take a course in this area which lies within the sector 12.
  • the sieves run in a meandering manner between forming strips 10, 11 arranged on both sides of the sieves, as is exaggeratedly shown in FIG. 4.
  • the deflection H of the sieves can be seen between adjacent, opposing forming strips 10 and 11, shown here by arrows on the outer sieve 5.
  • the upper layer 6 formed in the twin-wire former is held on the inner wire 4 after the wire separation and then placed on the lower layer 7. This arrangement is optimal in most cases for solving the task.
  • FIG. 7 shows a favorable technical design of the separating suction device 17. It is realized by dividing the water tub 12 and placed under negative pressure. It contains several sieve guide strips 18.

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Abstract

The assembly for the prodn. of multi-layer paper or cardboard has a double fourdrinier (3) with the leading end formed by the inner fourdrinier (4) passing round a paper-formation roller (8) with an outer dia. of at least 800 mm. The suspension stream (9) at the roller (8) forms an angle with the vertical between -60 degrees where the suspension stream is directed upwards and +90 degrees where the steam is directed downwards. On leaving the roller (8), the inner (4) and outer (5) fourdriniers adopt a path at the forming bars (10,11) which is aligned downwards and, within a sector (12), deviates from the verticals by max. 10 degrees to the inner fourdrinier side and max. 45 degrees to the outer fourdrinier side.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for producing a multilayer paper or cardboard according to the preamble of claim 1.

Vorrichtungen dieser Art haben den Vorteil, daß die Lagen separat gebildet werden können. Dabei kann es jedoch, insbesondere bei mehrlagigem Karton, zu sogenannten Spaltfestigkeitsproblemen kommen, d.h. zu Problemen hinsichtlich der Haftung zwischen den Lagen. Auch sind die aufgesetzten Doppelsiebformer sehr aufwendig, sowohl bezüglich der Vorrichtung, als auch des Platz- und Energiebedarfes.Devices of this type have the advantage that the layers can be formed separately. However, this can lead to so-called gap strength problems, in particular in the case of multilayer cardboard, i.e. to problems regarding the adhesion between the layers. The attached twin wire formers are also very complex, both in terms of the device, as well as the space and energy requirements.

Daher liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Gattung zu schaffen, bei der mit relativ wenig Aufwand die Vorteile der Formationsbeeinflussung, der hohen Spaltfestigkeit und des Plybond realisierbar sind.The invention is therefore based on the object of creating a device of the type mentioned at the outset in which the advantages of influencing the formation, the high gap strength and the ply bond can be achieved with relatively little effort.

Dies wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 beschriebenen Maßnahmen erreicht.This is achieved according to the invention by the measures described in the characterizing part of claim 1.

Die erfindungsgemäße Vorrichtung hat den wesentlichen Vorteil, daß durch die Formierwalze eine optimale Blattbildung erfolgt und infolge der Zentrifugalkräfte im Formierwalzenbereich die die Gautschwirkung unterstützenden Feinstoffe sehr früh an die spätere Gautschseite der oberen Lage gebracht werden. Die anschließende relativ steil abwärts führende Doppelsiebstrecke mit Formierleisten begünstigt das Abführen von Wasser. Dabei kann an den Leisten ganz ohne oder mit geringem Unterdruck gearbeitet werden, da das herabstürzende Wasser im wesentlichen nur umgelenkt werden muß. Der Former ist leicht zu regeln und erfordert wenig Energieaufwand. So wird insgesamt mit relativ einfachen Mitteln erreicht, daß sich beim Zusammenbringen der oberen mit der unteren Lage eine hohe Spaltfestigkeit einstellt, ohne daß die Formation negativ beeinflußt worden ist.The device according to the invention has the essential advantage that the forming roll ensures optimum sheet formation and, due to the centrifugal forces in the forming roll area, the fine substances which support the rubber effect are brought very early to the later rubber side of the upper layer. The subsequent, relatively steep downward double-wire section with forming strips favors the removal of water. You can work on the strips completely without or with little negative pressure, since the falling water essentially only has to be redirected. The former is easy to regulate and requires little energy. So it is achieved with relatively simple means that when bringing together the upper and lower layers establish a high gap strength without the formation being adversely affected.

Die Formierleisten im abwärts gerichteten Teil des Doppelsiebformers können auf einer oder auf beiden Seiten angebracht sein. Bekanntlich werden solche Leisten derart gegen die Siebe angedrückt, daß sie deren Verlauf verändern. Dadurch erfolgen Druck- und Sogwirkung auf die zwischen den Sieben befindliche Fasersuspensionsschicht.The forming strips in the downward part of the twin wire former can be attached to one or both sides. As is known, such strips are pressed against the sieves in such a way that they change their course. This results in pressure and suction on the fiber suspension layer between the sieves.

Die zur Vergautschung wichtigen Feinstoffe können durch gesteuerten Unterdruck und/oder feinfühlig verstellbare Formierleisten am Außensieb mit besonders guter Wirkung in der später zur Vergautschung dienenden Seite der oberen Lage konzentriert werden.The fine substances important for gushing can be concentrated in the side of the upper layer that will later be used for gushing by means of controlled negative pressure and / or sensitively adjustable forming strips on the outer screen.

Als dem Sieb zugewandte Hüllfläche von hintereinanderliegenden Leisten ist sowohl eine gerade als auch eine konvexe Kontur möglich. Erfindungsgemäß kann durch Formierwalzenentwässerung ein verringertes L/Q-Verhältnis erzeugt werden, ist das das Festigkeitsverhältnis der trockenen Bahn, längs gemessen, ins Verhältnis gesetzt zur quergemessenen Festigkeit.Both a straight and a convex contour are possible as the enveloping surface of the strips facing the sieve. According to the invention, a reduced L / Q ratio can be generated by forming roll dewatering, that is the strength ratio of the dry web, measured lengthways, in relation to the cross-measured strength.

Die Erfindung wird beschrieben und erläutert anhand von schematischen Zeichnungen in Seitenansicht. Dabei zeigen:

Fig. 1
Beispiel für die erfindungsgemäße Vorrichtung;
Fig. 2
Erläuterungen zur Festlegung der Parameter im Bereich der Formierwalze;
Fig. 3+4
desgleichen im Bereich des Doppelsiebs nach der Formierwalze;
Fig. 5+6
weitere Formen des Erfindungsgegenstandes;
Fig. 7
eine Variante im Detail.
The invention is described and explained with reference to schematic drawings in side view. Show:
Fig. 1
Example of the device according to the invention;
Fig. 2
Explanations for defining the parameters in the area of the forming roller;
3 + 4
likewise in the area of the twin wire after the forming roll;
5 + 6
further forms of the subject matter of the invention;
Fig. 7
a variant in detail.

Die Fig. 1 zeigt ein Beispiel eines zur erfindungsgemäßen Vorrichtung gehörenden Doppelsiebformers 3. Ein Innensieb 4 und ein Außensieb 5 werden im Bereich der Formierwalze 8 zusammengeführt. In diesen Bereich des Siebzwickels führt ein Stoffauflauf 1 einen Suspensionsstrahl 9 ein. Die beiden Siebe 4 und 5 sowie die dazwischen befindliche Suspensionsschicht werden auf der Formierwalze 8 im wesentlichen im Verlauf des Umschlingungswinkels ∂ entwässert. Ein Teil des Wassers kann dabei durch das Außensieb 5 in die Wasserwanne 14 abgeschleudert werden. Das Doppelsieb wird anschließend von der Formierwalze 8 tangential weggeführt, wobei es im wesentlichen eine abwärtsführende Richtung hat. In der hier gezeigten Ausführungsform sind auf beiden Seiten, d.h. im Innensieb 4 und im Außensieb 5, Formierleisten 10 bzw. 11 angebracht. Beidseitig angebrachte Leisten sind aber nicht immer erforderlich. Mit Vorteil können im Außensieb 5 angebrachte Leisten 11 zum Sieb hin beweglich und elastisch abgestützt ausgeführt sein. In an sich bekannter Weise wird das an den Leisten durch die Siebe hindurchtretende Wasser in Wasserwannen 12 bzw. 13 aufgefangen. In besonderen Fällen kann z.B. die im Innensieb 4 liegende Wasserwanne 12 mit einem Unterdruck versehen sein. Dieser zusätzliche Aufwand ist aber nur in Sonderfällen notwendig. Nach Verlassen des Formierleistenbereiches werden die beiden Siebe getrennt, wobei die Faserschicht am Innensieb 4 gehalten und bei Umlenkung über die Umlenkwalze 15 auf die auf dem Primärlangsieb 2 gebildete untere Lage 7 abgelegt wird. Die so entstandene Mehrlagenbahn verbleibt auf dem Primärlangsieb 2, während das Innensieb 4 abgehoben und zur Formierwalze 8 zurückgeführt wird. Ein Saugkasten 16 kann das Halten der Lagen auf dem Primärlangsieb 2 begünstigen.1 shows an example of a twin wire former 3 belonging to the device according to the invention. An inner wire 4 and an outer wire 5 are brought together in the area of the forming roller 8. Introduces into this area of the gusset Headbox 1 a suspension jet 9. The two screens 4 and 5 and the suspension layer located between them are dewatered on the forming roller 8 essentially in the course of the wrap angle ∂. Part of the water can be thrown through the outer sieve 5 into the water pan 14. The twin wire is then guided tangentially away from the forming roller 8, it essentially having a downward direction. In the embodiment shown here, forming strips 10 and 11 are attached on both sides, ie in the inner wire 4 and in the outer wire 5. However, strips on both sides are not always necessary. Advantageously, strips 11 mounted in the outer sieve 5 can be made movable and elastically supported towards the sieve. In a manner known per se, the water passing through the sieves on the strips is collected in water tanks 12 and 13, respectively. In special cases, the water pan 12 located in the inner sieve 4 can be provided with a negative pressure. This additional effort is only necessary in special cases. After leaving the forming strip area, the two sieves are separated, the fiber layer being held on the inner sieve 4 and, when deflected, deposited on the lower layer 7 formed on the primary longitudinal sieve 2 via the deflecting roller 15. The resulting multi-layer web remains on the primary longitudinal screen 2, while the inner screen 4 is lifted off and returned to the forming roller 8. A suction box 16 can favor the holding of the layers on the primary longitudinal screen 2.

In Fig. 2 ist sehr schematisch der Stoffauflauf 1 bzw. 1' in zwei extremen Lagen gezeigt. Man sieht, daß auf dem Strahl 9, der eine Ebene bildet, die Flächennormale N eingezeichnet ist. Diese Flächennormale N nimmt zur vertikalen V1 den Winkel α (linke Seite der Figur) ein. Die rechte Seite der Figur zeigt einen senkrecht gebildeten Suspensionsstrahl 9', dessen Normale N' zur vertikalen V1 einen Winkel α' bildet.In Fig. 2 the headbox 1 and 1 'is shown very schematically in two extreme positions. It can be seen that the surface normal N is drawn on the beam 9, which forms a plane. This surface normal N takes the angle α to the vertical V1 (left side of the figure). The right side of the figure shows a perpendicularly formed suspension beam 9 ', the normal N' of which forms an angle α 'to the vertical V1.

In Fig. 3 ist der Sektor 12 eingezeichnet. Er wird begrenzt durch einen Winkel β bezüglich der Vertikalen V2 nach innen und durch einen Winkel β' bezüglich der Vertikalen V2 nach außen. Die beiden Siebe 4 und 5 sollen in diesem Bereich einen Verlauf einnehmen, der innerhalb des Sektors 12 liegt.The sector 12 is shown in FIG. 3. It is limited by an angle β with respect to the vertical V2 inwards and by an angle β 'with respect to the vertical V2 outwards. The two screens 4 and 5 are to take a course in this area which lies within the sector 12.

Zwischen beidseitig der Siebe angeordneten Formierleisten 10, 11 verlaufen die Siebe mäanderförmig, wie es übertrieben in Fig. 4 dargestellt ist. Man erkennt zwischen benachbarten, sich gegenüberstehenden Formierleisten 10 und 11 die Ablenkung H der Siebe, hier durch Maßpfeile am Außensieb 5 gezeigt.The sieves run in a meandering manner between forming strips 10, 11 arranged on both sides of the sieves, as is exaggeratedly shown in FIG. 4. The deflection H of the sieves can be seen between adjacent, opposing forming strips 10 and 11, shown here by arrows on the outer sieve 5.

Eine weitere Variante in der Anordnung ist denkbar, wenn zwar die obere Lage 6 auf dem Innensieb 4 gehalten wird, wie in Fig. 1 gezeigt, der Formierleistenbereich jedoch eine Krümmung hat, die entgegen der Formierwalze 8 ist (Fig. 5). Diese spezielle Form bringt bei sonst gleichen Verhältnissen einen größeren Umschlingungswinkel δ an der Formierwalze 8 mit sich. Ein Trennsauger 17 hält dabei die Faserschicht am Innensieb 4.Another variant in the arrangement is conceivable if the upper layer 6 is held on the inner wire 4, as shown in FIG. 1, but the forming strip area has a curvature that is opposite to the forming roller 8 (FIG. 5). This special shape brings about a larger wrap angle δ on the forming roller 8 with otherwise the same conditions. A separating suction device 17 holds the fiber layer on the inner wire 4.

In den in Fig. 1 und 5 gezeigten Ausführungsformen des Erfindungsgegenstandes wird die im Doppelsiebformer gebildete obere Lage 6 nach der Siebtrennung auf dem Innensieb 4 gehalten und anschließend auf die untere Lage 7 abgelegt. Diese Anordnung ist in den meisten Fällen zur Lösung der gestellten Aufgabe optimal.In the embodiments of the subject matter of the invention shown in FIGS. 1 and 5, the upper layer 6 formed in the twin-wire former is held on the inner wire 4 after the wire separation and then placed on the lower layer 7. This arrangement is optimal in most cases for solving the task.

Wie die Fig. 6 zeigt, ist aber auch eine Umkehrung dieses Prinzips in der Art möglich, daß nach der Trennung des Innensiebs 4 vom Außensieb 5 die obere Lage 6 auf dem Außensieb 5 verbleibt und von diesem auf die untere Lage 7 abgelegt wird.As shown in FIG. 6, a reversal of this principle is also possible in such a way that after the separation of the inner sieve 4 from the outer sieve 5, the upper layer 6 remains on the outer sieve 5 and is deposited by the latter onto the lower layer 7.

In Fig. 7 ist eine günstige technische Ausführung des Trennsaugers 17 dargestellt. Er wird durch Abteilen von der Wasserwanne 12 realisiert und unter Unterdruck gesetzt. Er enthält mehrere Siebführungsleisten 18.FIG. 7 shows a favorable technical design of the separating suction device 17. It is realized by dividing the water tub 12 and placed under negative pressure. It contains several sieve guide strips 18.

Claims (16)

Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons mit einem Primärlangsieb (2) und einem darüber angeordneten, als Gapformer ausgebildeten Doppelsiebformer (3) mit einem Innensieb (4) und einem Außensieb (5) sowie mit im Doppelsiebbereich an mindestens einem dieser Siebe anliegenden, den Siebverlauf ändernden Formierleisten (10,11), wobei der Doppelsiebformer (3) eine obere Lage (6) des mehrlagigen Papiers oder Kartons bildet und auf eine untere Lage (7) ablegt, indem die beiden Siebe (4 und 5) wieder getrennt werden und die obere Lage (6) am Innensieb (4) oder Außensieb (5) zum Primärlangsieb (2) weitergeführt wird,
dadurch gekennzeichnet,
daß a) der Doppelsiebformer (3) anfangs eine vom Innensieb (4) umschlungene Formierwalze (8) mit mindestens 800 mm Außendurchmesser aufweist, b) der Winkel (α), den die auf den Suspensionsstrahl (9) gefällte Normale (N) bei dessen Auftreffen auf die Formierwalze (8) zur Vertikalen (V1) bildet, zwischen - 60o (Suspensionsstrahl aufwärts gerichtet) und + 90o (Suspensionsstrahl abwärts gerichtet) beträgt, c) Innensieb (4) und Außensieb (5) nach der Formierwalze (8) im Bereich der Formierleisten (10,11) einen Verlauf einnehmen, der abwärts gerichtet ist und dabei innerhalb eines Sektors (12) liegt, der zur Innensiebseite in einem Winkel (β) von maximal 10o und zur Außensiebseite in einem Winkel (β') von maximal 45o von der Vertikalen (V2) abweicht. Device for producing a multi-ply paper or cardboard with a primary longitudinal screen (2) and a double screen former (3) arranged above it, designed as a gap former, with an inner screen (4) and an outer screen (5), and with in the twin screen area adjacent to at least one of these screens Forming strips (10, 11) changing the course of the sieve, the twin-wire former (3) forming an upper layer (6) of the multilayer paper or cardboard and depositing it on a lower layer (7) by separating the two sieves (4 and 5) again and the upper layer (6) on the inner sieve (4) or outer sieve (5) is continued to the primary longitudinal sieve (2),
characterized by
that a) the twin-wire former (3) initially has a forming roll (8) with at least 800 mm outside diameter, which is wrapped around the inner wire (4), b) the angle (α) that the normal (N) falling on the suspension jet (9) forms when it hits the forming roller (8) to the vertical (V1), between - 60 o (suspension jet directed upwards) and + 90 o (Suspension jet directed downwards), c) inner sieve (4) and outer sieve (5) after the forming roller (8) in the region of the forming strips (10, 11) take a course which is directed downward and lies within a sector (12) which is at an angle to the inner sieve side (β) of a maximum of 10 o and to the outer screen side at an angle (β ') of a maximum of 45 o from the vertical (V2). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Winkel (α), den die auf den Suspensionsstrahl (9) gefällte Normale (N) bei dessen Auftreffen auf die Formierwalze (8) zur Vertikalen (V1) bildet, zwischen - 10o (Suspensionsstrahl leicht aufwärts gerichtet) und + 90o (Suspensionsstrahl abwärts gerichtet) beträgt.Device according to claim 1,
characterized by
that the angle (α) that the normal (N) falling on the suspension jet (9) forms when it hits the forming roller (8) to the vertical (V1), between - 10 o (suspension jet directed slightly upwards) and + 90 o (Suspension jet directed downwards). Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß in dem abwärts gerichteten Bereich des Dopppelsiebes beidseitig Formierleisten (10 und 11) angebracht sind.Device according to claim 1 or 2,
characterized by
that in the downward area of the double screen forming strips (10 and 11) are attached on both sides. Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß die Siebe im Bereich der Formierleisten (10, 11) einen mäanderförmigen Lauf bilden.Device according to claim 3,
characterized by
that the sieves form a meandering course in the area of the forming strips (10, 11). Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
daß die Mäanderform durch Ablenkung (H) der Siebe an benachbarten, sich gegenüberliegenden Formierleisten (10,11) im Bereich zwischen 0,5 und 5 mm entsteht.Device according to claim 4,
characterized by
that the meander shape is created by deflecting (H) the sieves on adjacent, opposing forming strips (10, 11) in the range between 0.5 and 5 mm. Vorrichtung nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet,
daß mehrere zu einem Sieb gehörende, in Laufrichtung direkt hintereinander angeordnete Formierleisten (10,11) an ihrer dem Sieb zugewandten Seite, in Sieblaufrichtung gesehen, eine gewölbte Hüllkurve bilden.Device according to claim 1, 2, 3, 4 or 5,
characterized by
that a plurality of forming strips (10, 11) belonging to a sieve and arranged directly behind one another in the running direction form an arched envelope curve on their side facing the sieve, viewed in the running direction of the sieve. Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet,
daß die Wölbung der Hüllkurve dieselbe Krümmungsrichtung hat wie die Formierwalze (8).Apparatus according to claim 6,
characterized by
that the curvature of the envelope curve has the same direction of curvature as the forming roller (8). Vorrichtung nach Anspruch 1, 2, 3, 4, 5, 6 oder 7,
dadurch gekennzeichnet,
daß der Umschlingungswinkel (∂) von beiden Sieben (4, 5) an der Formierwalze (8) 10o bis 180o beträgt.Device according to claim 1, 2, 3, 4, 5, 6 or 7,
characterized by
that the wrap angle (∂) of both screens (4, 5) on the forming roller (8) is 10 o to 180 o . Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß der Umschlingungswinkel (∂) von beiden Sieben (4, 5) an der Formierwalze (8) 10o bis 100o beträgt.Device according to claim 8,
characterized by
that the wrap angle (∂) of both screens (4, 5) on the forming roller (8) is 10 o to 100 o . Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß im Bereich von wenigstens 90 % der Formierleisten (10,11) kein Unterdruck angelegt ist.Device according to claim 1 or 2,
characterized by
that no vacuum is applied in the area of at least 90% of the forming strips (10, 11). Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß an keiner der Formierleisten (10, 11) Unterdruck angelegt ist.Apparatus according to claim 10,
characterized by
that no pressure is applied to any of the forming strips (10, 11). Vorrichtung nach Anspruch 3, 4 oder 5,
dadurch gekennzeichnet,
daß die am Außensieb (5) anliegenden Formierleisten (11) zum Sieb hin beweglich und elastisch abgestützt sind.Device according to claim 3, 4 or 5,
characterized by
that the forming strips (11) resting on the outer sieve (5) are movably and elastically supported towards the sieve. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß in Laufrichtung hinter den Formierleisten (10, 11) am Innensieb (4) ein Trennsauger (17) anliegt, in dessen Wirkungsbereich das Außensieb (5) abgeführt wird.Device according to one of the preceding claims,
characterized by
that in the direction of travel behind the forming strips (10, 11) on the inner wire (4) a separating suction device (17) rests, in the effective area of which the outer wire (5) is removed. Vorrichtung nach Anspruch 13,
dadurch gekennzeichnet,
daß der Trennsauger (17) als Baueinheit mit der die Formierleisten (10) am Innensieb (4) aufnehmenden Wasserwanne (12) ausgebildet ist, wobei durch Abtrennung im Trennsauger (17) ein anderer Unterdruck als in der Wasserwanne (12) möglich ist.Device according to claim 13,
characterized by
that the vacuum cleaner (17) as a unit with which the molding strips (10) on Inner tray (4) receiving water tray (12) is formed, wherein a different vacuum than in the water tray (12) is possible by separation in the suction pad (17). Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß an der Formierwalze (8) im Umschlingungsbereich ein Unterdruck nach innen angelegt ist.Device according to one of the preceding claims,
characterized by
that a vacuum is applied to the forming roller (8) in the wrap area. Vorrichtung nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
daß die obere Lage (6) der unteren Lage (7) so zugeführt wird, daß nach der Trennung des Innensiebes (4) vom Außensieb (5) die obere Lage am Innensieb (4) gehalten und dann auf die untere Lage (7) abgelegt wird.Device according to one of the preceding claims,
characterized by
that the upper layer (6) of the lower layer (7) is fed so that after the separation of the inner sieve (4) from the outer sieve (5) the upper layer is held on the inner sieve (4) and then placed on the lower layer (7) becomes.
EP96112594A 1995-08-23 1996-08-03 Device for making multilayer paper or cardboard Revoked EP0761874B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19530983 1995-08-23
DE19530983A DE19530983B4 (en) 1995-08-23 1995-08-23 Device for producing a multilayer paper or cardboard

Publications (3)

Publication Number Publication Date
EP0761874A2 true EP0761874A2 (en) 1997-03-12
EP0761874A3 EP0761874A3 (en) 1998-01-14
EP0761874B1 EP0761874B1 (en) 2001-06-13

Family

ID=7770172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96112594A Revoked EP0761874B1 (en) 1995-08-23 1996-08-03 Device for making multilayer paper or cardboard

Country Status (3)

Country Link
US (1) US5788816A (en)
EP (1) EP0761874B1 (en)
DE (1) DE19530983B4 (en)

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EP1398412A1 (en) * 2002-09-13 2004-03-17 Voith Paper Patent GmbH Method and twin wire former for producing a fibrous web
DE10303464A1 (en) * 2003-01-29 2004-09-30 Voith Paper Patent Gmbh Papermaking process has two de-watering sieve belts running back-to-back and tangentially deflected at the mid-point by a transverse wiper blade

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DE19651493A1 (en) * 1996-12-11 1998-06-18 Voith Sulzer Papiermasch Gmbh Sieve section and method for forming a multi-layer fibrous web
DE19803591A1 (en) 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Twin-wire former
DE19903943A1 (en) * 1999-01-28 2000-08-03 Voith Sulzer Papiertech Patent Method and device for forming a fibrous web
DE19949354A1 (en) * 1999-10-13 2001-04-19 Voith Paper Patent Gmbh Assembly for the prodn of a multi-layer paper/cardboard web has a number of web formation zones with their stock inlets for secondary layers to be laid on the primary layer with bonding between them
DE19950806A1 (en) * 1999-10-21 2001-04-26 Voith Paper Patent Gmbh Twin wire former
DE10161056A1 (en) * 2001-12-12 2003-06-26 Voith Paper Patent Gmbh Wire section
DE102007015638A1 (en) * 2007-03-31 2008-10-02 Voith Patent Gmbh Machine for producing a tissue web, in particular a tissue machine
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DE10303464A1 (en) * 2003-01-29 2004-09-30 Voith Paper Patent Gmbh Papermaking process has two de-watering sieve belts running back-to-back and tangentially deflected at the mid-point by a transverse wiper blade

Also Published As

Publication number Publication date
DE19530983A1 (en) 1997-02-27
EP0761874B1 (en) 2001-06-13
US5788816A (en) 1998-08-04
DE19530983B4 (en) 2006-04-27
EP0761874A3 (en) 1998-01-14

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