EP2753752B1 - Machine for producing a fibrous web comprising a device for transferring and stabilizing the fibrous web - Google Patents

Machine for producing a fibrous web comprising a device for transferring and stabilizing the fibrous web Download PDF

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Publication number
EP2753752B1
EP2753752B1 EP12733462.1A EP12733462A EP2753752B1 EP 2753752 B1 EP2753752 B1 EP 2753752B1 EP 12733462 A EP12733462 A EP 12733462A EP 2753752 B1 EP2753752 B1 EP 2753752B1
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EP
European Patent Office
Prior art keywords
web
fabric
machine according
roll
suction
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EP12733462.1A
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German (de)
French (fr)
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EP2753752A1 (en
Inventor
Daniel Gronych
Ute Lukschanderl
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2753752A1 publication Critical patent/EP2753752A1/en
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    • 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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one 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
    • D21F2/00—Transferring continuous webs from wet ends to press sections

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular a paper, board or tissue web comprising a device for transferring and stabilizing a moving fibrous web, wherein the fibrous web along the web running path is initially in a first sandwich area between a web-issuing and a web-receiving covering , Then in a transfer section is only on the web-receiving clothing and then located in a second sandwich area between the web-receiving and another stringing and wherein a standing Saugerelement is provided on the web-facing side of the web-receiving fabric, the at least one suction zone in the first sandwich area and at least has a suction zone in the region of the transfer line.
  • the device can be used, for example, in pulp, paper, board or tissue machines.
  • Such devices are known with standing sucking element for transferring a fibrous web from one to another covering, for example WO 2009/118449 A1 and from WO 2009/065433 A1 , Since the standing nipple elements cause wear on the clothing, it is not possible to apply as high a negative pressure for transfer as when using pickup suction rollers or suction rollers as separation rollers.
  • negative pressures of p 0.2 - 0.6 bar below normal pressure quite common. Due to the lower negative pressure in standing suction elements, however, the transfer of the fibrous web is then often not so reliable. In particular, the edges can cause web run problems and breaks in subsequent machine groups. Therefore, the previously known devices with upright vacuum elements are also used only in very slow manufacturing machines and at very high basis weight of the fibrous web, eg in cardboard.
  • the object of the invention is to develop a simple, reliable and low-wear device for transfer and stabilization, in which the Fiber web, especially at the edges is better managed and less web running problems occur, but still less wear on the fabrics is caused.
  • a stabilizing element is provided with a convex surface on the web-facing side of the web-receiving clothing after the nipple element, so that together with the nipple a predominantly or fully curved Bahnlaufweg results from the end of the first sandwich area at least up to a point A, which is between 20 and 150 mm, preferably between 20 and 100 mm, before the beginning of the second sandwich area.
  • a point A which is between 20 and 150 mm, preferably between 20 and 100 mm, before the beginning of the second sandwich area.
  • the convex curvature of the stabilizing element adjoins directly after the curvature of the teat element without a straight line extending therebetween.
  • the suction element is preferably pivotable and / or linearly adjustable, so that at least one operating position and a raised position are adjustable.
  • the sucker element can be designed as a separating sucker, i. If the fibrous web is led a longer distance between two fabrics and then to be taken over on one of the two fabrics. Here, the fabrics run at substantially the same speed.
  • the sucker element can also be designed as a pickup sucker, which is the case when the web is only briefly passed between two clothing to pass the web from one to the other clothing. Here it is helpful and also possible that the web-receiving clothing has a slightly higher speed than the web-dispensing clothing.
  • the stabilizing element can also be carried out with negative pressure acted upon.
  • a higher negative pressure is adjustable than in the stabilizing element. This will e.g. only a higher negative pressure applied directly at the web transfer, while in the other areas only a lower negative pressure is sufficient.
  • the negative pressure should preferably be in the range between 10 and 40 kPa, more preferably between 10 and 30 kPa.
  • the negative pressure if it is evacuated, should preferably be between 0.5 and 20 kPa, more preferably between 0.5 and 15 kPa.
  • the aspiration of the sucker element is preferably carried out by the direct connection to a suction source.
  • the stabilizing element can either be aspirated by the direct connection to a suction or it is generated in the stabilizing element by means of a corresponding Blas KunststoffdĆ¼se a negative pressure or the stabilizing element is connected to the sucker element, that the stabilizing element is indirectly sucked.
  • the stabilization element can also have a plurality of zones which can be acted upon with different negative pressure and are arranged one after the other in the web running direction.
  • a driven roller may be arranged in the clothing loop of the web-receiving clothing preferably in the running direction directly after the stabilizing element. It may be advantageous if the wrapping of the fabric on the driven roller is at least 40 Ā°, more preferably at least 70 Ā°.
  • a speed difference of at least + 0.2%, more preferably of at least + 0.5%, between the web-dispensing and web-receiving clothing and / or between the web-receiving and the other Covering is adjustable.
  • the surface of the teat element or of the stabilizing element which comes into contact with a string, is not damaged or worn too quickly, the surface may preferably consist of a temperature-resistant, in particular also temperature-shock-resistant material, in particular ceramic.
  • the side of the sucker element and the stabilization element facing the clothing has openings, in particular slots and / or bores, via which the negative pressure can act on the clothing and on the fibrous web.
  • the openings are in an area that is narrower than the width of the fabric.
  • the sucker element may have a convex surface on the side facing the clothing.
  • the suction element consists of several parts that are flexibly connected to each other, so that they can adapt to the contour of the guide roller and in particular can be adjusted or pressed something independently of each other.
  • the stabilizing element can be designed as a standing box. He is not moved in relation to the orbital movement of the clothing. Particular attention must be paid to wear in this design.
  • the stabilizing element may be designed as a rotating roller.
  • the rotating roller may in particular be equipped with a drive. Since this roller only as a stabilizing element without or only with a lower vacuum and not as a high vacuum roll, as it is necessary for the web separation or web transfer must be performed, it can be made simpler and thus cheaper.
  • the roller can be directly aspirated or indirectly, by being connected to the suction element via openings and is sucked by this with.
  • the sealing between roller and suction element is preferably carried out via sliding seals, for example via one or more blades which extend across the width, and over side shields, which may consist of plastic, preferably of PU, PE or Teflon.
  • a Grenz Kunststoffabstreifer for example in the form of a scraper blade provided, which repels entrained air from the roll shell, so that it is not introduced into the region of the suction element.
  • Sucker and the running as a rotating roller stabilization element can be connected, in particular by a common support body that they are jointly adjustable or swung.
  • the stabilizing element embodied as a rotating roller and / or the guide roller arranged opposite the concave suction element have a soft polymer cover or a soft polymer coating or a soft polymer surface, preferably one Softness of more than 0 P & J, more preferably of more than 3 P & J is equipped.
  • the stabilizing element designed as a rotating roller and / or the guide roller arranged opposite the concave suction element can have an open storage volume at the surface, in particular in the form of grooves, preferably with a groove depth between 1.5 and 15 mm and preferably with a groove width between 0.5 and 2 mm.
  • the inventive device can be particularly advantageous in a press section of a machine for producing a fibrous web, in particular a paper, board or tissue web with two separately standing, in the web running direction successively arranged press nips, each consisting of a press roll, in particular shoe press roll, and a counter roll will be used.
  • the device is provided between the two press nips, wherein the press section is designed so that the center of the press roll of the first press nip is equal to or higher than the center of the press roll of the second press nip and the center of the counter roll of the first press nip equal to or higher lies as the center of the counter roll of the second press nip.
  • the press section can be designed with two shoe press nips or with a roller nip and a shoe press nip. Likewise, a further press nip may be provided before or after the two press nips.
  • Fig.1 are the two press nips 7,8 a press section shown, which are each formed by a press roller 11,13 and a counter-roller 12,14.
  • the centers of the rolls of the first press nip 7 are each higher than the centers of the corresponding rolls of the second press nip 8.
  • the fibrous web 1 is taken over by a pickup suction roll 9 on the fabric 2 and thus in the press section.
  • the fibrous web 1 is dewatered in the first press nip 7 and then further transported a piece in the sandwich.
  • the convex Sucker 30 fixes the fibrous web 1 on the fabric 3 before the fabric 2 is lifted and is led away around the guide roller 16.
  • the separation point of the two fabrics 2 and 3 can be moved on the sucker element 30.
  • the transfer follows the transfer line, on which the fibrous web 1 is guided freely on the fabric 3.
  • the teat element 30 still extends a distance into the transfer section.
  • the standing convex stabilization element 40 so that there is a continuous curvature of the transfer path.
  • the fibrous web 1 is held by the web tension due to the curvature and, if present on the negative pressure of the stabilizing element 40, which may be lower than that of the sucker element 30, reliably on the fabric 3 until it is again passed between two fabrics 3 and 4.
  • the driven guide roll 17, which follows the next element in the string loop on the stabilizing element 40, pulls on the fabric 3, so that no compression caused by the braking action of the suction and stabilizing elements.
  • the clothing 4 can run faster than the clothing 3, preferably at least 0.2%, particularly preferably at least 0.5% faster.
  • the sandwich area between covering 3 and 4 again follows a transfer section on which the fibrous web 1 is guided freely on the covering 4.
  • the stabilizing element 41 connects, so that here too the curvature is maintained throughout until the fibrous web 1 between the fabric 4 and 5 is guided to the second press nip 8.
  • Adhering to the fabric 5, the fibrous web 1 is guided to the next transfer point and taken there by the pickup suction roll 10 on the fabric 6 of the next group.
  • the fabric 6 may be, for example, a felt of another press or a dryer fabric of the first dryer group.
  • both the arrangement of sucker element 30 and stabilizing element 40, as well as the arrangement of sucker element 31 and stabilizing element 41 represent a device according to the invention.
  • the fabric 2 is the web-dispensing, the fabric 3, the web-receiving and the clothing 4, the further clothing.
  • the fabric 3 is the web-dispensing, the fabric 4, the web-receiving and the fabric 5, the further clothing.
  • the coverings 2, 3, 4 are preferably felts, and the cover 5 is preferably a semipermeable or water-impermeable transfer belt.
  • the fabric 5 may alternatively be a felt.
  • lubricating spray pipes 50,51,52 are provided, which apply low pressure water to the inside of the fabrics just before they are pulled over the standing elements.
  • the spray tube can be equipped with several, possibly overlapping nozzles. It can also be moved oscillating in the transverse direction.
  • individual or all guide rollers 16, 17, 18, 19 should be adjustable and / or pivotable.
  • 1a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 40, to the beginning of the second sandwich area, which is formed by the fabric 3 and 4 on the sucker element 31.
  • a preferred length for the safety distance S a value between 20 and 150 mm, more preferably between 20 and 100 mm has been found.
  • Fig.2 a further embodiment of the invention is shown in which the sucker element 32 has a concave surface. This significantly reduces the friction to the clothing. About the employment or contact pressure on the guide roller 16 of the web travel path is still specified. Subsequent to the sucker element 32, the stabilizing element 42, which has changing radii of curvature, follows directly to keep the required space as small as possible. The transfer of the fibrous web 1 on the fabric 4 is carried out with a concave suction element 33, where it was previously performed in sandwich on the rotating stabilizing element 43. In this configuration, no appreciable speed differences between clothing 3 and 4 are possible.
  • 2a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 42, to the beginning of the second sandwich region, which is formed by the fabric 3 and 4 on the stabilizing element 43.
  • Figure 3 is an embodiment with a convex suction member 30 combined with a rotating roller as a stabilizing element 44.
  • the sucker member 30 is preferably designed so that it is as close as possible to the roller 44 and that the curvature of the transfer path on the roller 44 continues.
  • the roller 44 and suction member 30 may be connected so that the roller 44 is sucked by the suction member 30. They can also be connected in such a way that they can be swung together or moved together.
  • the transfer to covering 4 takes place with a further convex suction element 31. In the subsequent further transfer line the fibrous web 1 is held by a further roller as a stabilizing element 45.
  • 3a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 44, to the beginning of the second sandwich region, which is formed by the fabric 3 and 4 on the sucker element 31.
  • FIG 5 is an execution like after Figure 3 shown with convex suction elements 30,31, in which after stabilizing element 45 formed as a roller but still a stabilizing element 46 follows, so that even on the second transfer path, a predominantly or completely curved path running on the fabric 4 results.
  • the arrangement of suction element 31 and the stabilizing elements 45 and 46 is a device according to the invention.
  • FIG 6 again shows an embodiment similar to the Figure 4 with concave suction elements 32,34.
  • the stabilizing element 45 designed as a roller is followed by a stationary stabilizing element 46, so that a predominantly or completely curved path running on the covering 4 also results on the second transfer path.
  • the arrangement of suction element 34 and the stabilizing elements 45 and 46 is a device according to the invention.
  • the rotating stabilizing element 44 is the designed as a rotating roller stabilizing element 44 and the following guide roller 17 is shown with drive.
  • the rotating stabilizing element 44 or particularly preferably only the guide roller 17 may have a drive in order to ensure sufficient tension both in the Covering as well as in the fibrous web to provide.
  • the convex surface of the stationary stabilizing elements and / or the suction elements can also be formed by a plurality of transversely arranged strips, so that the predominantly curved track running path is achieved in a polygonal course.

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  • Treatment Of Fiber Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier-, Karton- oder Tissuebahn umfassend eine Vorrichtung zur Ɯbergabe und Stabilisierung einer laufenden Faserstoffbahn, wobei sich die Faserstoffbahn entlang des Bahnlaufweges zunƤchst in einem ersten Sandwichbereich zwischen einer bahnabgebenden und einer bahnaufnehmenden Bespannung befindet, dann in einer Transferstrecke nur auf der bahnaufnehmenden Bespannung liegt und danach sich in einem zweiten Sandwichbereich zwischen der Bahnaufnehmenden und einer weiteren Bespannung befindet und wobei ein stehendes Saugerelement auf der bahnabgewandten Seite der bahnaufnehmenden Bespannung vorgesehen ist, das wenigstens eine Saugzone im ersten Sandwichbereich und wenigstens eine Saugzone im Bereich der Transferstrecke aufweist.The invention relates to a machine for producing a fibrous web, in particular a paper, board or tissue web comprising a device for transferring and stabilizing a moving fibrous web, wherein the fibrous web along the web running path is initially in a first sandwich area between a web-issuing and a web-receiving covering , Then in a transfer section is only on the web-receiving clothing and then located in a second sandwich area between the web-receiving and another stringing and wherein a standing Saugerelement is provided on the web-facing side of the web-receiving fabric, the at least one suction zone in the first sandwich area and at least has a suction zone in the region of the transfer line.

Zum Einsatz kommen kann die Vorrichtung beispielsweise in Zellstoff-, Papier-, Karton- oder Tissuemaschinen.The device can be used, for example, in pulp, paper, board or tissue machines.

Bekannt sind solche Vorrichtungen mit stehendem Saugerelement zur Ɯbergabe einer Faserstoffbahn von einer auf eine andere Bespannung beispielsweise aus WO 2009/118449 A1 und aus WO 2009/065433 A1 . Da die stehenden Saugerelemente VerschleiƟ an den Bespannungen verursachen, kann kein so hoher Unterdruck zur Ɯbergabe angewandt werden wie bei der Verwendung von Pickup-Saugwalzen oder Saugwalzen als Trennwalzen. Hierbei sind UnterdrĆ¼cke von p= 0,2 - 0,6 bar unter dem Normaldruck durchaus Ć¼blich. Durch den geringeren Unterdruck bei stehenden Saugerelementen ist die Ɯbergabe der Faserstoffbahn dann allerdings oft nicht so zuverlƤssig. Insbesondere die RƤnder kƶnnen Bahnlaufprobleme und Abrisse in nachfolgenden Maschinengruppen verursachen. Deshalb werden die bisher bekannten Vorrichtungen mit stehenden Saugerelementen auch nur bei sehr langsamen Herstellmaschinen und bei sehr hohem FlƤchengewicht der Faserstoffbahn, z.B. bei Karton verwendet.Such devices are known with standing sucking element for transferring a fibrous web from one to another covering, for example WO 2009/118449 A1 and from WO 2009/065433 A1 , Since the standing nipple elements cause wear on the clothing, it is not possible to apply as high a negative pressure for transfer as when using pickup suction rollers or suction rollers as separation rollers. Here are negative pressures of p = 0.2 - 0.6 bar below normal pressure quite common. Due to the lower negative pressure in standing suction elements, however, the transfer of the fibrous web is then often not so reliable. In particular, the edges can cause web run problems and breaks in subsequent machine groups. Therefore, the previously known devices with upright vacuum elements are also used only in very slow manufacturing machines and at very high basis weight of the fibrous web, eg in cardboard.

Die Aufgabe der Erfindung ist es, eine einfache, zuverlƤssige und verschleiƟarme Vorrichtung zur Ɯbergabe und Stabilisierung zu entwickeln, bei der die Faserstoffbahn, insbesondere auch an den RƤndern besser gefĆ¼hrt wird und weniger Bahnlaufprobleme auftreten, aber trotzdem weniger VerschleiƟ an den Bespannungen verursacht wird.The object of the invention is to develop a simple, reliable and low-wear device for transfer and stabilization, in which the Fiber web, especially at the edges is better managed and less web running problems occur, but still less wear on the fabrics is caused.

Die Aufgabe wird erfindungsgemƤƟ dadurch gelƶst, dass ein Stabilisierungselement mit konvexer OberflƤche auf der bahnabgewandten Seite der bahnaufnehmenden Bespannung nach dem Saugerelement vorgesehen ist, so dass sich zusammen mit dem Saugerelement ein Ć¼berwiegend oder vollstƤndig gekrĆ¼mmter Bahnlaufweg ergibt vom Ende des ersten Sandwichbereiches mindestens bis zu einer Stelle A, die sich zwischen 20 und 150 mm, bevorzugt zwischen 20 und 100 mm, vor dem Beginn des zweiten Sandwichbereiches befindet. Besonders bevorzugt schlieƟt sich die konvexe KrĆ¼mmung des Stabilisierungselementes direkt nach der KrĆ¼mmung des Saugerelementes ohne dazwischen liegende gerade Strecke an.The object is achieved in that a stabilizing element is provided with a convex surface on the web-facing side of the web-receiving clothing after the nipple element, so that together with the nipple a predominantly or fully curved Bahnlaufweg results from the end of the first sandwich area at least up to a point A, which is between 20 and 150 mm, preferably between 20 and 100 mm, before the beginning of the second sandwich area. Particularly preferably, the convex curvature of the stabilizing element adjoins directly after the curvature of the teat element without a straight line extending therebetween.

Es wurde erkannt, dass ein wesentlicher Nachteil der Anordnungen nach dem Stand der Technik in der geraden oder Ć¼berwiegend geraden Transferstrecke nach der Ɯbergabe an die bahnaufnehmende Bespannung besteht. Auch mit zusƤtzlicher Besaugung auf der geraden Strecke kann Randaufstehen, Randzupfen und -flattern nicht sicher verhindert werden. Erst durch die erfindungsgemƤƟ Ć¼berwiegend gekrĆ¼mmte BahnfĆ¼hrung, insbesondere wenn sie auf der Transferstrecke vollstƤndig gekrĆ¼mmt mindestens bis zur Stelle A erfolgt, durch ein konvexes Stabilisierungselement werden die RƤnder aufgrund der sich ergebenden Normalkraft sicher an der bahnaufnehmenden Bespannung gehalten. Versuche haben gezeigt, dass das auch schon ohne Besaugung und Unterdruck im Stabilisierungselement funktioniert. Dadurch wird es mƶglich, auch bei hƶherer Produktionsgeschwindigkeit, z.B. Ć¼ber 1000 m/min, und/oder bei niedrigerem FlƤchengewicht der Faserstoffbahn, z.B. kleiner als 120 g/m2, problemlos eine Vorrichtung mit stehenden Saugerelementen zu verwenden, ohne dass Ć¼bermƤƟige Bahnlaufprobleme oder zu starker VerschleiƟ auftreten. FĆ¼r ein stehendes Saugerelement anstatt einer Saugwalze fĆ¼r die Bahnabnahme fallen sehr viel geringere Investitions- und Ersatzteilkosten und geringere Betriebskosten an.It has been recognized that a major disadvantage of the prior art arrangements is the straight or mostly straight transfer path after transfer to the web-receiving clothing. Even with additional aspiration on the straight line edge rising, edge plucking and fluttering can not be safely prevented. Only by virtue of the predominantly curved web guide according to the invention, in particular if it is completely curved on the transfer path to at least point A, by means of a convex stabilizing element are the edges securely held on the web-receiving clothing due to the resulting normal force. Experiments have shown that this works even without aspiration and negative pressure in the stabilizing element. This makes it possible, even at higher production speeds, for example, over 1000 m / min, and / or at lower basis weight of the fibrous web, for example, less than 120 g / m 2 , to use a device with standing teat elements without problems without excessive web running problems or heavy wear occur. For a standing vacuum cleaner element instead of a suction roller for the web acceptance much lower investment and spare parts costs and lower operating costs.

Der Sicherheitsabstand S zwischen der Stelle A, die das Ende der gekrĆ¼mmten BahnfĆ¼hrung markiert, und dem Beginn des zweiten Sandwichbereiches ist notwendig, damit beim Auftreten von Faserstoffbahnfetzen oder Batzen, wie es beim ƜberfĆ¼hren der Fall sein kann, weder die Bespannung noch die OberflƤchen der Sauger- oder Stabilisierungselemente beschƤdigt werden. Der Sicherheitsabstand S ist mit einer LƤnge in Bahnlaufrichtung von 20 bis 150 mm, bevorzugt von 20 bis 100 mm so gewƤhlt, dass ein ausreichender Abstand zwischen den festen OberflƤchen fĆ¼r den Durchgang von Faserstoffbahnfetzen oder Batzen gegeben ist und gleichzeitig keine Gefahr mehr besteht, dass auf dieser kurzen Strecke die RƤnder der Faserstoffbahn flattern oder aufstehen kƶnnen. Bei bisher bekannten AusfĆ¼hrungen ist der gerade gefĆ¼hrte Teil der Transferstrecke meist lƤnger als 1000 mm, was immer wieder zu erheblichen Bahnlaufstƶrungen fĆ¼hrt.The safety distance S between the point A, which marks the end of the curved track guide, and the beginning of the second sandwich area is necessary so that neither fibrous webs nor the surfaces of the nipples occur when fiber webs or chunks occur, as may be the case during transfer - or stabilizing elements are damaged. The safety distance S is chosen with a length in the web running direction of 20 to 150 mm, preferably from 20 to 100 mm so that a sufficient distance between the solid surfaces for the passage of fibrous web shreds or batzen is given and at the same time there is no longer a danger flutter the edges of the fibrous web or get up this short distance. In previously known embodiments, the straight part of the transfer line is usually longer than 1000 mm, which again and again leads to considerable web disturbances.

Das Saugerelement ist bevorzugt schwenkbar und/oder linear verstellbar, so dass zumindest eine Betriebsposition und eine abgehobene Position einstellbar sind. Das Saugerelement kann als Trennsauger ausgefĆ¼hrt sein, d.h. wenn die Faserstoffbahn eine lƤngere Strecke zwischen zwei Bespannungen gefĆ¼hrt wird und dann auf eine der beiden Bespannungen Ć¼bernommen werden soll. Hierbei laufen die Bespannungen mit im Wesentlichen gleicher Geschwindigkeit. Das Saugerelement kann auch als Pickup-Sauger ausgebildet sein, das ist dann der Fall, wenn die Bahn nur kurzzeitig zwischen zwei Bespannungen gefĆ¼hrt wird, um die Bahn von einer auf die andere Bespannung zu Ć¼bergeben. Hierbei ist es hilfreich und auch mƶglich, dass die bahnaufnehmende Bespannung eine etwas hƶhere Geschwindigkeit als die bahnabgebende Bespannung hat.The suction element is preferably pivotable and / or linearly adjustable, so that at least one operating position and a raised position are adjustable. The sucker element can be designed as a separating sucker, i. If the fibrous web is led a longer distance between two fabrics and then to be taken over on one of the two fabrics. Here, the fabrics run at substantially the same speed. The sucker element can also be designed as a pickup sucker, which is the case when the web is only briefly passed between two clothing to pass the web from one to the other clothing. Here it is helpful and also possible that the web-receiving clothing has a slightly higher speed than the web-dispensing clothing.

Die konvexe OberflƤche des Stabilisierungselementes kann auch durch eine Mehrzahl von quer angeordneten Leisten gebildet sein, so dass der Ć¼berwiegend gekrĆ¼mmte Bahnlaufweg in einem polygonfƶrmigen Verlauf erzielt wird.The convex surface of the stabilizing element can also be formed by a plurality of transversely arranged strips, so that the predominantly curved track running path is achieved in a polygonal course.

Um noch eine zusƤtzliche Normalkraft auf die Faserstoffbahn in Richtung Bespannung aufzubringen, kann das Stabilisierungselement auch mit Unterdruck beaufschlagbar ausgefĆ¼hrt werden.In order to apply an additional normal force to the fibrous web in the direction of clothing, the stabilizing element can also be carried out with negative pressure acted upon.

Durch einen geringeren Unterdruck wird eine geringere Luftmenge abgesaugt, was vorteilhaft fĆ¼r die Auslegung der Peripherie ist. Um bei geringer Absaugmenge und geringen Betriebskosten eine trotzdem optimale BahnfĆ¼hrung zu erreichen, kann es vorteilhaft sein, wenn im Betrieb mit Faserstoffbahn in wenigstens einer Saugzone des Saugerelements ein hƶherer Unterdruck einstellbar ist als in dem Stabilisierungselement. Dadurch wird z.B. nur direkt bei der BahnĆ¼bergabe ein hƶherer Unterdruck angewandt, wƤhrend in den anderen Bereichen nur ein geringerer Unterdruck ausreichend ist.By a lower negative pressure, a smaller amount of air is sucked, which is advantageous for the design of the periphery. In order to achieve a still optimal web guide with low suction and low operating costs, it may be advantageous if in operation with fibrous web in at least one suction zone of the sucker element, a higher negative pressure is adjustable than in the stabilizing element. This will e.g. only a higher negative pressure applied directly at the web transfer, while in the other areas only a lower negative pressure is sufficient.

FĆ¼r das Saugerelement und das weitere Saugerelement sollte der Unterdruck bevorzugt im Bereich zwischen 10 und 40 kPa, besonders bevorzugt zwischen 10 und 30 kPa liegen. FĆ¼r das Stabilisierungselement sollte der Unterdruck, falls es besaugt ist, bevorzugt zwischen 0,5 und 20 kPa, besonders bevorzugt zwischen 0,5 und 15 kPa liegen.For the sucker element and the further sucker element, the negative pressure should preferably be in the range between 10 and 40 kPa, more preferably between 10 and 30 kPa. For the stabilizing element, the negative pressure, if it is evacuated, should preferably be between 0.5 and 20 kPa, more preferably between 0.5 and 15 kPa.

Die Besaugung des Saugerelements erfolgt bevorzugt durch den direkten Anschluss an eine Absaugquelle. Das Stabilisierungselement kann entweder auch durch den direkten Anschluss an einen Absaugquelle besaugt werden oder es wird im Stabilisierungselement mithilfe einer entsprechenden BlasluftdĆ¼se ein Unterdruck erzeugt oder das Stabilisierungselement wird so mit dem Saugerelement verbunden, dass das Stabilisierungselement indirekt besaugt wird.The aspiration of the sucker element is preferably carried out by the direct connection to a suction source. The stabilizing element can either be aspirated by the direct connection to a suction or it is generated in the stabilizing element by means of a corresponding BlasluftdĆ¼se a negative pressure or the stabilizing element is connected to the sucker element, that the stabilizing element is indirectly sucked.

Das Stabilisierungselement kann auch mehrere mit unterschiedlichem Unterdruck beaufschlagbare und in Bahnlaufrichtung nacheinander angeordnete Zonen aufweisen.The stabilization element can also have a plurality of zones which can be acted upon with different negative pressure and are arranged one after the other in the web running direction.

Um die Bahnspannung der Faserstoffbahn und damit der RƤnder auf ausreichend hohem Niveau zu halten, kann eine angetriebene Walze in der Bespannungsschlaufe der bahnaufnehmenden Bespannung bevorzugt in Laufrichtung direkt nach dem Stabilisierungselement angeordnet sein. Dabei kann es vorteilhaft sein, wenn die Umschlingung der Bespannung auf der angetriebenen Walze mindesten 40Ā° besonders bevorzugt mindestens 70Ā° betrƤgt.In order to keep the web tension of the fibrous web and thus the edges at a sufficiently high level, a driven roller may be arranged in the clothing loop of the web-receiving clothing preferably in the running direction directly after the stabilizing element. It may be advantageous if the wrapping of the fabric on the driven roller is at least 40 Ā°, more preferably at least 70 Ā°.

Um die Bahnspannung noch besser einstellen zu kƶnnen, ist es von Vorteil, wenn eine Geschwindigkeitsdifferenz von mindestens +0,2%, besonders bevorzugt von mindestens +0,5% zwischen der bahnabgebenden und der bahnaufnehmenden Bespannung und/oder zwischen der bahnaufnehmenden und der weiteren Bespannung einstellbar ist.To be able to adjust the web tension even better, it is advantageous if a speed difference of at least + 0.2%, more preferably of at least + 0.5%, between the web-dispensing and web-receiving clothing and / or between the web-receiving and the other Covering is adjustable.

Eine zusƤtzliche Reduzierung der Investitions- und Betriebskosten ergibt sich, wenn ein weiteres stehendes Saugerelement im zweiten Sandwichbereich auf der bahnabgewandten Seite der weiteren Bespannung vorgesehen ist. Dadurch wird eine ansonsten dort Ć¼bliche Saugwalze mit hohem Unterdruck ebenfalls ersetzt.An additional reduction of the investment and operating costs results when another standing suction element is provided in the second sandwich area on the side facing away from the web of further covering. As a result, an otherwise customary suction roll with high negative pressure is also replaced.

Der VerschleiƟ der Bespannung kann noch deutlich reduziert werden, in Bahnlaufrichtung vor dem Saugerelement und/oder vor dem Stabilisierungselement ein Schmierspritzrohr oder eine Wassertasche zur Schmierung angeordnet ist. Das Schmierspritzrohr kann als Niederdruckspritzrohr ausgefĆ¼hrt sein, das Wasser gleichmƤƟig Ć¼ber der Saugerbreite oder der Bespannungsbreite auftrƤgt. Die Wassertasche muss so ausgefĆ¼hrt sein, dass sie immer wieder mit Wasser nachgefĆ¼llt wird und die Bespannung durchgƤngig befeuchtet wird. SelbstverstƤndlich kann auch vor einem weiteren Saugerelement vorteilhafterweise ein Schmierspritzrohr oder ein Wassertasche zur Schmierung angeordnet sein. Weiterhin kann es vorteilhaft sein, die Auf- und die Ablaufkanten des Saugerelements und/oder des Stabilisierungselements angefast oder abgerundet auszufĆ¼hren.The wear of the fabric can be significantly reduced, in the web running direction in front of the nipple element and / or before the stabilizing element a lubricating spray pipe or a water bag is arranged for lubrication. The lubricating spray pipe can be designed as a low-pressure spray pipe, which applies water evenly over the suction width or the width of the clothing. The water bag must be designed so that it is always refilled with water and the fabric is moistened throughout. Of course, before a further sucker element advantageously a lubricating spray pipe or a water bag for lubrication can be arranged. Furthermore, it may be advantageous to chamfer or round off the leading and trailing edges of the teat element and / or the stabilizing element.

Damit auch die OberflƤche des Saugerelements oder des Stabilisierungselements, die mit einer Bespannung in Kontakt kommt, nicht beschƤdigt oder zu schnell verschlissen wird, kann die OberflƤche bevorzugt aus einem temperaturbestƤndigen, insbesondere auch temperaturschock-bestƤndigem Material, insbesondere aus Keramik, bestehen. Die der Bespannung zugewandte Seite des Saugerelement und des Stabilisierungselements weist Ɩffnungen, insbesondere Schlitze und/oder Bohrungen auf, Ć¼ber die der Unterdruck auf die Bespannung und auf die Faserstoffbahn wirken kann. Die Ɩffnungen befinden sich in einem Bereich der schmƤler ist als die Breite der Bespannung.So that the surface of the teat element or of the stabilizing element, which comes into contact with a string, is not damaged or worn too quickly, the surface may preferably consist of a temperature-resistant, in particular also temperature-shock-resistant material, in particular ceramic. The side of the sucker element and the stabilization element facing the clothing has openings, in particular slots and / or bores, via which the negative pressure can act on the clothing and on the fibrous web. The openings are in an area that is narrower than the width of the fabric.

Das Saugerelement kann eine konvexe OberflƤche auf der der Bespannung zugewandten Seite aufweisen. Somit wird fĆ¼r einen dauernd zur gleichen Seite hin gekrĆ¼mmten Bahnlaufweg zwischen erstem und zweitem Sandwichbereich gesorgt, was vorteilhaft fĆ¼r die stabile BahnfĆ¼hrung ist aufgrund der wirkenden NormalkrƤfte.The sucker element may have a convex surface on the side facing the clothing. Thus, for a constantly curved to the same side web travel path between the first and second sandwich area provided, which is advantageous for the stable web guide due to the acting normal forces.

In einer weiteren bevorzugten AusfĆ¼hrung, die sich durch besonders wenig VerschleiƟ auszeichnet, kann die der Bespannung zugewandte OberflƤche des Saugerelements konkav ausgebildet sein und auf der Seite der bahnabgebenden Bespannung gegenĆ¼ber vom Saugerelement kann eine Leitwalze angeordnet sein, die bevorzugt in vertikaler und/oder horizontaler Richtung verstellbar ist. Durch die konkave Ausbildung wird die Reibung stark reduziert und durch die Leitwalze wird trotzdem ein vorgegebener Bahnlaufweg eingestellt. Durch die Verstellvorrichtung der Leitwalze kann sowohl eine Feinjustierung des Abstandes oder der Anpressung an das Saugerelement, sowie der Zwickelgeometrie bei der BahnĆ¼bergabe erfolgen, als auch beispielsweise eine Verstellung zwischen ƜberfĆ¼hr- und Betriebsposition.In a further preferred embodiment, which is characterized by particularly little wear, the covering surface of the suction element facing the covering may be concave and on the side of the web dispensing covering opposite the suction element, a guide roller may be arranged, preferably in the vertical and / or horizontal direction is adjustable. Due to the concave design, the friction is greatly reduced and the guide roller nevertheless sets a predetermined web travel path. By adjusting the guide roller both a fine adjustment of the distance or the contact pressure on the suction element, as well as the gusset geometry in the web transfer can be done, as well as, for example, an adjustment between transfer and operating position.

Um bei einer konkaven OberflƤche eine kontrollierte Anpressung und Abdichtung zu erreichen, kann es vorteilhaft sein, flexibel mit dem Kasten des Saugerelements verbundene Dichtleisten quer zum Bahnlaufweg vorzusehen, die sich an die Kontur der Leitwalze anpassen kƶnnen und die insbesondere angepresst werden kƶnnen. Das kann mit Federn, elastischen Elementen oder Ć¼ber pneumatische Elemente erzielt werden. Weiterhin kann auch das Saugerelement aus mehreren Teilen besteht, die flexibel miteinander verbunden sind, so dass sie sich an die Kontur der Leitwalze anpassen kƶnnen und insbesondere etwas unabhƤngig voneinander verstellt oder angepresst werden kƶnnen.In order to achieve a controlled contact pressure and sealing in a concave surface, it may be advantageous to provide flexible sealing strips connected transversely to the web running path with the box of the sucker element, which can adapt to the contour of the guide roll and which can in particular be pressed. This can be achieved with springs, elastic elements or pneumatic elements. Furthermore, the suction element consists of several parts that are flexibly connected to each other, so that they can adapt to the contour of the guide roller and in particular can be adjusted or pressed something independently of each other.

FĆ¼r eine besonders einfache und kostengĆ¼nstige Anordnung kann das Stabilisierungselement als stehender Kasten ausgefĆ¼hrt sein. Im Bezug auf die Umlaufbewegung der Bespannung wird er nicht mitbewegt. Bei dieser AusfĆ¼hrung muss besonders Augenmerk auf den VerschleiƟ gerichtet werden.For a particularly simple and inexpensive arrangement, the stabilizing element can be designed as a standing box. He is not moved in relation to the orbital movement of the clothing. Particular attention must be paid to wear in this design.

Um einen geringen Bauraum zu beanspruchen und eine flexible Festlegung der Zwickelgeometrie bei der BahnĆ¼bergabe zu ermƶglichen, kann die mit der Bespannung in Kontakt kommende OberflƤche des Stabilisierungselements mit wenigstens zwei verschiedenen Radien gekrĆ¼mmt sein.In order to claim a small space and to allow flexible determination of the gusset geometry in the web transfer, which comes into contact with the fabric surface of the stabilizing element can be curved with at least two different radii.

Alternativ kann das Stabilisierungselement als rotierende Walze ausgefĆ¼hrt sein. Dadurch wird der VerschleiƟ der Bespannung auf ein Minimum reduziert. Die rotierende Walze kann insbesondere mit einem Antrieb ausgerĆ¼stet sein. Da diese Walze nur als Stabilisierungselement ohne oder nur mit geringerem Unterdruck und nicht als Hochvakuumwalze, wie es fĆ¼r die Bahntrennung beziehungsweise BahnĆ¼bergabe notwendig ist, ausgefĆ¼hrt werden muss, kann sie einfacher und damit kostengĆ¼nstiger ausgefĆ¼hrt werden. Die Walze kann direkt besaugt werden oder indirekt, indem sie entsprechend mit dem Saugerelement Ć¼ber Ɩffnungen verbunden ist und von diesem mit besaugt wird. Die Abdichtung zwischen Walze und Saugerelement erfolgt bevorzugt Ć¼ber schleifende Dichtungen, beispielsweise Ć¼ber eine oder mehrere Klingen, die sich Ć¼ber der Breite erstrecken, und Ć¼ber seitliche Schilde, die aus Kunststoff, bevorzugt aus PU, PE oder Teflon bestehen kƶnnen.Alternatively, the stabilizing element may be designed as a rotating roller. As a result, the wear of the fabric is reduced to a minimum. The rotating roller may in particular be equipped with a drive. Since this roller only as a stabilizing element without or only with a lower vacuum and not as a high vacuum roll, as it is necessary for the web separation or web transfer must be performed, it can be made simpler and thus cheaper. The roller can be directly aspirated or indirectly, by being connected to the suction element via openings and is sucked by this with. The sealing between roller and suction element is preferably carried out via sliding seals, for example via one or more blades which extend across the width, and over side shields, which may consist of plastic, preferably of PU, PE or Teflon.

An der rotierenden Walze ist bevorzugt ein Grenzluftabstreifer, beispielsweise in Form einer Schaberklinge, vorgesehen, der vom Walzenmantel mitgeschleppte Luft abweist, so dass diese nicht in den Bereich des Saugelementes eingeschleppt wird.On the rotating roller is preferably a Grenzluftabstreifer, for example in the form of a scraper blade provided, which repels entrained air from the roll shell, so that it is not introduced into the region of the suction element.

Saugerelement und das als rotierende Walze ausgefĆ¼hrte Stabilisierungselement kƶnnen so verbunden sein, insbesondere durch einen gemeinsamen Tragkƶrper, dass sie gemeinsam verstellbar oder abschwenkbar sind.Sucker and the running as a rotating roller stabilization element can be connected, in particular by a common support body that they are jointly adjustable or swung.

Weiterhin kann es vorteilhaft sein, wenn das als rotierende Walze ausgefĆ¼hrte Stabilisierungselement und/oder die gegenĆ¼ber dem konkaven Saugerelement angeordnete Leitwalze mit einem weichen Polymerbezug oder einer weichen Polymerbeschichtung oder einer weichen PolymeroberflƤche, bevorzugt mit einer Weichheit von mehr als 0 P&J, besonders bevorzugt von mehr als 3 P&J ausgestattet ist.Furthermore, it can be advantageous if the stabilizing element embodied as a rotating roller and / or the guide roller arranged opposite the concave suction element have a soft polymer cover or a soft polymer coating or a soft polymer surface, preferably one Softness of more than 0 P & J, more preferably of more than 3 P & J is equipped.

Um mitgeschleppte Luft aufzunehmen und dadurch das Entstehen eines lokalen Ɯberdruckes zu vermeiden, kann das als rotierende Walze ausgefĆ¼hrte Stabilisierungselement und/oder die gegenĆ¼ber dem konkaven Saugerelement angeordnete Leitwalze ein offenes Speichervolumen an der OberflƤche aufweisen, insbesondere in Form von Rillen, bevorzugt mit einer Rillentiefe zwischen 1,5 und 15 mm und bevorzugt mit einer Rillenbreite zwischen 0,5 und 2 mm.In order to take entrained air and thereby avoid the formation of a local overpressure, the stabilizing element designed as a rotating roller and / or the guide roller arranged opposite the concave suction element can have an open storage volume at the surface, in particular in the form of grooves, preferably with a groove depth between 1.5 and 15 mm and preferably with a groove width between 0.5 and 2 mm.

Die erfindungsgemƤƟe Vorrichtung kann besonders vorteilhaft in einer Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier-, Karton-, oder Tissuebahn mit zwei separat stehenden, in Bahnlaufrichtung nacheinander angeordneten Pressnips, die jeweils aus einer Presswalze, insbesondere Schuhpresswalze, und einer Gegenwalze gebildet werden, eingesetzt werden. Dabei wird die Vorrichtung zwischen den beiden Pressnips vorgesehen, wobei die Pressenpartie so gestaltet ist, dass der Mittelpunkt der Presswalze des ersten Pressnips gleich hoch oder hƶher liegt als der Mittelpunkt der Presswalze des zweiten Pressnips und der Mittelpunkt der Gegenwalze des ersten Pressnips gleich hoch oder hƶher liegt als der Mittelpunkt der Gegenwalze des zweiten Pressnips. Dadurch kann ein besonders gute Geometrie der Bespannungszwickel an der Ɯbergabestelle und eine geeignete KrĆ¼mmung des Bahnlaufweges erzielt werden. Die Pressenpartie kann mit zwei Schuhpressnips oder mit einem Walzennip und einem Schuhpressnip ausgefĆ¼hrt sein. Ebenso kann vor oder nach den beiden Pressnips noch ein weiterer Pressnip vorgesehen sein.The inventive device can be particularly advantageous in a press section of a machine for producing a fibrous web, in particular a paper, board or tissue web with two separately standing, in the web running direction successively arranged press nips, each consisting of a press roll, in particular shoe press roll, and a counter roll will be used. The device is provided between the two press nips, wherein the press section is designed so that the center of the press roll of the first press nip is equal to or higher than the center of the press roll of the second press nip and the center of the counter roll of the first press nip equal to or higher lies as the center of the counter roll of the second press nip. As a result, a particularly good geometry of the clothing gusset at the transfer point and a suitable curvature of the web travel path can be achieved. The press section can be designed with two shoe press nips or with a roller nip and a shoe press nip. Likewise, a further press nip may be provided before or after the two press nips.

Anhand von bevorzugten AusfĆ¼hrungsbeispielen werden weitere vorteilhafte Merkmale der Erfindung erlƤutert unter Bezugnahme auf die Zeichnungen. Sie zeigen

in Fig.1
eine bevorzugte AusfĆ¼hrung der Vorrichtung mit konvexem Saugerelement und stehendem Stabilisierungselement in einer Pressenpartie
in Fig.1a
Detaildarstellung zum Sicherheitsabstand S fĆ¼r die eine bevorzugte AusfĆ¼hrung der Vorrichtung mit stehendem Stabilisierungselement
in Fig.2
eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit konkavem Saugerelement und stehendem Stabilisierungselement in einer Pressenpartie
in Fig.2a
Detaildarstellung zum Sicherheitsabstand S fĆ¼r die eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit stehendem Stabilisierungselement
in Fig.3
noch eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit konvexem Saugerelement und rotierendem Stabilisierungselement in einer Pressenpartie
in Fig.3a
Detaildarstellung zum Sicherheitsabstand S fĆ¼r die eine bevorzugte AusfĆ¼hrung der Vorrichtung mit rotierendem Stabilisierungselement
in Fig.4
noch eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit konkavem Saugerelement und rotierendem Stabilisierungselement in einer Pressenpartie
in Fig.5
noch eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit konvexem Saugerelement, rotierendem Stabilisierungselement und weiterem stehenden Stabilisierungselement in einer Pressenpartie
in Fig.6
noch eine weitere bevorzugte AusfĆ¼hrung der Vorrichtung mit konkavem Saugerelement, rotierendem Stabilisierungselement und weiterem stehenden Stabilisierungselement in einer Pressenpartie
On the basis of preferred embodiments , further advantageous features of the invention will be explained with reference to the drawings. they show
in Fig.1
a preferred embodiment of the device with a convex suction element and stationary stabilizing element in a press section
in Fig.1a
Detailed representation of the safety distance S for the one preferred embodiment of the device with stationary stabilizing element
in Fig.2
a further preferred embodiment of the device with a concave suction element and standing stabilizing element in a press section
in Fig.2a
Detailed representation of the safety distance S for the another preferred embodiment of the device with stationary stabilizing element
in Fig.3
Yet another preferred embodiment of the device with a convex suction element and a rotating stabilizing element in a press section
in Fig.3a
Detailed view of the safety distance S for a preferred embodiment of the device with a rotating stabilizing element
in Fig.4
Yet another preferred embodiment of the device with concave suction element and rotating stabilizing element in a press section
in Fig.5
Yet another preferred embodiment of the device with a convex suction element, rotating stabilizing element and further stationary stabilizing element in a press section
in Fig.6
Yet another preferred embodiment of the device with a concave suction element, rotating stabilizing element and further stationary stabilizing element in a press section

Nachfolgend werden die Figuren detaillierter beschrieben.The figures are described in more detail below.

In Fig.1 sind die beiden Pressnips 7,8 einer Pressenpartie dargestellt, die jeweils von einer Presswalze 11,13 und einer Gegenwalze 12,14 gebildet werden. Die Mittelpunkte der Walzen des ersten Pressnips 7 liegen jeweils hƶher als die Mittelpunkte der entsprechenden Walzen des zweiten Pressnips 8. Die Faserstoffbahn 1 wird von einer Pickup-Saugwalze 9 auf die Bespannung 2 und damit in die Pressenpartie Ć¼bernommen. Im Sandwich zwischen den Bespannungen 2 und 3 wird die Faserstoffbahn 1 im ersten Pressnip 7 entwƤssert und danach noch ein StĆ¼ck im Sandwich weitertransportiert. Das konvexe Saugerelement 30 fixiert die Faserstoffbahn 1 auf der Bespannung 3 bevor die Bespannung 2 abgehoben wird und um die Leitwalze 16 weggefĆ¼hrt wird. Durch die angedeutete Verstellung der Leitwalze 16 kann die Trennstelle der beiden Bespannungen 2 und 3 auf dem Saugerelement 30 verschoben werden. Nach der Ɯbergabe folgt die Transferstrecke, auf der die Faserstoffbahn 1 frei auf der Bespannung 3 gefĆ¼hrt wird. Das Saugerelement 30 erstreckt sich noch ein StĆ¼ck weit in die Transferstrecke hinein. Direkt im Anschluss befindet sich das stehende konvexe Stabilisierungselement 40, so dass sich eine durchgƤngige KrĆ¼mmung der Transferstrecke ergibt. Die Faserstoffbahn 1 wird durch die Bahnspannung aufgrund der KrĆ¼mmung und falls vorhanden Ć¼ber den Unterdruck des Stabilisierungselements 40, der niedriger als der des Saugerelements 30 sein kann, zuverlƤssig an der Bespannung 3 gehalten, bis sie wieder zwischen zwei Bespannungen 3 und 4 gefĆ¼hrt wird. Die angetriebene Leitwalze 17, die als nƤchstes Element in der Bespannungsschlaufe auf das Stabilisierungselement 40 folgt, zieht an der Bespannung 3, so dass keine Stauchung durch die Bremswirkung der Sauger- und Stabilisierungselemente entsteht.In Fig.1 are the two press nips 7,8 a press section shown, which are each formed by a press roller 11,13 and a counter-roller 12,14. The centers of the rolls of the first press nip 7 are each higher than the centers of the corresponding rolls of the second press nip 8. The fibrous web 1 is taken over by a pickup suction roll 9 on the fabric 2 and thus in the press section. In the sandwich between the fabrics 2 and 3, the fibrous web 1 is dewatered in the first press nip 7 and then further transported a piece in the sandwich. The convex Sucker 30 fixes the fibrous web 1 on the fabric 3 before the fabric 2 is lifted and is led away around the guide roller 16. By the indicated adjustment of the guide roller 16, the separation point of the two fabrics 2 and 3 can be moved on the sucker element 30. After the transfer follows the transfer line, on which the fibrous web 1 is guided freely on the fabric 3. The teat element 30 still extends a distance into the transfer section. Immediately following is the standing convex stabilization element 40, so that there is a continuous curvature of the transfer path. The fibrous web 1 is held by the web tension due to the curvature and, if present on the negative pressure of the stabilizing element 40, which may be lower than that of the sucker element 30, reliably on the fabric 3 until it is again passed between two fabrics 3 and 4. The driven guide roll 17, which follows the next element in the string loop on the stabilizing element 40, pulls on the fabric 3, so that no compression caused by the braking action of the suction and stabilizing elements.

Mithilfe des konvexen Saugerelements 31 wird die Faserstoffbahn 1 auf die Bespannung 4 Ć¼bernommen. Zwischen dem Stabilisierungselement 40 und dem Saugerelement 31 muss eine ausreichender Abstand vorhanden sein, so dass Fetzen und Batzen, die beispielsweise beim ƜberfĆ¼hren nach einem Abriss oder einem Stillstand entstehen kƶnnen, hindurchpassen, ohne dass die Bespannungen oder die OberflƤchen der Sauger- oder Stabilisierungselemente beschƤdigt werden. Dazu ist ein Sicherheitsabstand S, gemessen in Richtung des Bahnlaufweges, zwischen dem Ende der die Bespannung berĆ¼hrenden OberflƤche des Stabilisierungselementes 40 und dem Beginn des zweiten Sandwichbereiches auf dem Saugerelement 31 vorgesehen. Der Sicherheitsabstand S wird in der Fig.1a noch weiter erlƤutert.By means of the convex suction member 31, the fibrous web 1 is taken over on the fabric 4. There must be a sufficient distance between the stabilizing element 40 and the suction element 31 so that shreds and chunks, which may arise, for example, during transfer after a break or a standstill, pass through without damaging the clothing or the surfaces of the suction or stabilizing elements , For this purpose, a safety distance S, measured in the direction of the web travel path, between the end of the fabric-contacting surface of the stabilization element 40 and the beginning of the second sandwich region on the sucker element 31 is provided. The safety distance S is in the 1a further explained.

Um die Ɯbergabe der Faserstoffbahn 1 zu unterstĆ¼tzen und um die Bahnspannung wieder etwas zu erhƶhen, kann die Bespannung 4 schneller als die Bespannung 3 laufen, bevorzugt mindestens 0,2%, besonders bevorzugt mindestens 0,5% schneller. Nach dem Sandwichbereich zwischen Bespannung 3 und 4 folgt wieder eine Transferstrecke auf der die Faserstoffbahn 1 frei auf der Bespannung 4 gefĆ¼hrt wird. Nach dem Saugerelement 31 schlieƟt sich das Stabilisierungselement 41 an, so dass auch hier die KrĆ¼mmung durchgƤngig erhalten bleibt bis die Faserstoffbahn 1 zwischen Bespannung 4 und 5 zum zweiten Pressnip 8 gefĆ¼hrt wird. Auf der Bespannung 5 haftend wird die Faserstoffbahn 1 zur nƤchsten Ɯbergabestelle gefĆ¼hrt und dort von der Pickup-Saugwalze 10 auf die Bespannung 6 der nƤchsten Gruppe Ć¼bernommen. Die Bespannung 6 kann beispielsweise ein Filz einer weiteren Presse oder ein Trockensieb der ersten Trockengruppe sein.In order to support the transfer of the fibrous web 1 and to slightly increase the web tension again, the clothing 4 can run faster than the clothing 3, preferably at least 0.2%, particularly preferably at least 0.5% faster. After the sandwich area between covering 3 and 4 again follows a transfer section on which the fibrous web 1 is guided freely on the covering 4. After the sucker element 31, the stabilizing element 41 connects, so that here too the curvature is maintained throughout until the fibrous web 1 between the fabric 4 and 5 is guided to the second press nip 8. Adhering to the fabric 5, the fibrous web 1 is guided to the next transfer point and taken there by the pickup suction roll 10 on the fabric 6 of the next group. The fabric 6 may be, for example, a felt of another press or a dryer fabric of the first dryer group.

Sowohl die Anordnung aus Saugerelement 30 und Stabilisierungselement 40, als auch die Anordnung aus Saugerelement 31 und Stabilisierungselement 41 stellen eine erfindungsgemƤƟe Vorrichtung dar. Im ersten Fall ist die Bespannung 2 die bahnabgebende, die Bespannung 3 die bahnaufnehmende und die Bespannung 4 die weitere Bespannung. Und im zweiten Fall ist die Bespannung 3 die bahnabgebende, die Bespannung 4 die bahnaufnehmende und die Bespannung 5 die weitere Bespannung.Both the arrangement of sucker element 30 and stabilizing element 40, as well as the arrangement of sucker element 31 and stabilizing element 41 represent a device according to the invention. In the first case, the fabric 2 is the web-dispensing, the fabric 3, the web-receiving and the clothing 4, the further clothing. And in the second case, the fabric 3 is the web-dispensing, the fabric 4, the web-receiving and the fabric 5, the further clothing.

In dieser AusfĆ¼hrung sind die Bespannungen 2,3,4 bevorzugt Filze und die Bespannung 5 ist bevorzugt ein semipermeables oder wasserundurchlƤssiges Transferband. Die Bespannung 5 kann alternativ auch ein Filz sein.In this embodiment, the coverings 2, 3, 4 are preferably felts, and the cover 5 is preferably a semipermeable or water-impermeable transfer belt. The fabric 5 may alternatively be a felt.

Um die Reibung zwischen den Bespannungen und den stehenden Elementen zu reduzieren sind Schmierspritzrohre 50,51,52 vorgesehen, die mit Niederdruck Wasser auf die Innenseite der Bespannungen auftragen, kurz bevor sie Ć¼ber die stehenden Elemente gezogen werden. Um einen gleichmƤƟige Verteilung Ć¼ber der Breite zu erreichen, kann das Spritzrohr mit mehreren, eventuell sich Ć¼berlappenden DĆ¼sen ausgestattet sein. Es kann auch noch in Querrichtung oszillierend bewegt werden. Um die Umschlingwinkel der Bespannungen auf den Saugerelementen und Stabilisierungselementen einstellen zu kƶnnen, sollten einzelne oder alle Leitwalzen 16,17,18,19 verstellbar und/oder schwenkbar ausgefĆ¼hrt sein.In order to reduce the friction between the fabrics and the standing elements, lubricating spray pipes 50,51,52 are provided, which apply low pressure water to the inside of the fabrics just before they are pulled over the standing elements. In order to achieve an even distribution across the width, the spray tube can be equipped with several, possibly overlapping nozzles. It can also be moved oscillating in the transverse direction. In order to be able to set the wrap angles of the clothing on the teat elements and stabilizing elements, individual or all guide rollers 16, 17, 18, 19 should be adjustable and / or pivotable.

Fig.1a verdeutlicht den Sicherheitsabstand S, der sich von der Stelle A, dem Ablauf der Bespannung 3 vom Stabilisierungselement 40, bis zum Beginn des zweiten Sandwichbereiches, der durch die Bespannung 3 und 4 auf dem Saugerelement 31 gebildet wird, erstreckt. Als bevorzugte LƤnge fĆ¼r den Sicherheitsabstand S hat sich ein Wert zwischen 20 und 150 mm, besonders bevorzugt zwischen 20 und 100 mm herausgestellt. 1a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 40, to the beginning of the second sandwich area, which is formed by the fabric 3 and 4 on the sucker element 31. As a preferred length for the safety distance S, a value between 20 and 150 mm, more preferably between 20 and 100 mm has been found.

In Fig.2 ist eine weitere erfindungsgemƤƟe AusfĆ¼hrung gezeigt, bei der das Saugerelement 32 eine konkave OberflƤche aufweist. Dadurch wird die Reibung zur Bespannung deutlich reduziert. Ɯber die Anstellung oder Anpressung an die Leitwalze 16 wird der Bahnlaufweg trotzdem vorgegeben. Im Anschluss an das Saugerelement 32 folgt direkt das stehende Stabilisierungselement 42, das sich Ƥndernde KrĆ¼mmungsradien aufweist, um den benƶtigten Bauraum mƶglichst klein zu halten. Die Ɯbergabe der Faserstoffbahn 1 auf die Bespannung 4 erfolgt mit einem konkaven Saugerelement 33, wobei sie vorher im Sandwich Ć¼ber das rotierende Stabilisierungselement 43 gefĆ¼hrt wurde. In dieser Konfiguration sind keine nennenswerten Geschwindigkeitsunterschiede zwischen Bespannung 3 und 4 mƶglich.In Fig.2 a further embodiment of the invention is shown in which the sucker element 32 has a concave surface. This significantly reduces the friction to the clothing. About the employment or contact pressure on the guide roller 16 of the web travel path is still specified. Subsequent to the sucker element 32, the stabilizing element 42, which has changing radii of curvature, follows directly to keep the required space as small as possible. The transfer of the fibrous web 1 on the fabric 4 is carried out with a concave suction element 33, where it was previously performed in sandwich on the rotating stabilizing element 43. In this configuration, no appreciable speed differences between clothing 3 and 4 are possible.

Fig.2a verdeutlicht den Sicherheitsabstand S, der sich von der Stelle A, dem Ablauf der Bespannung 3 vom Stabilisierungselement 42, bis zum Beginn des zweiten Sandwichbereiches, der durch die Bespannung 3 und 4 auf dem Stabilisierungselement 43 gebildet wird, erstreckt. 2a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 42, to the beginning of the second sandwich region, which is formed by the fabric 3 and 4 on the stabilizing element 43.

Fig.3 ist eine AusfĆ¼hrung mit einem konvexen Saugerelement 30 kombiniert mit einer rotierenden Walze als Stabilisierungselement 44. Das Saugerelement 30 ist bevorzugt so ausgefĆ¼hrt, dass es mƶglichst nahe und passend an der Walze 44 angeordnet ist und dass sich die KrĆ¼mmung der Transferstrecke auf der Walze 44 fortsetzt. Walze 44 und Saugerelement 30 kƶnnen so verbunden sein, dass die Walze 44 vom Saugerelement 30 besaugt wird. Sie kƶnnen auch so verbunden sein, dass sie zusammen abschwenkbar oder verschiebbar sind. Die Ɯbergabe auf Bespannung 4 erfolgt mit einem weiteren konvexen Saugerelement 31. In der nachfolgenden weiteren Transferstrecke wird die Faserstoffbahn 1 von einer weiteren Walze als Stabilisierungselement 45 gehalten. Figure 3 is an embodiment with a convex suction member 30 combined with a rotating roller as a stabilizing element 44. The sucker member 30 is preferably designed so that it is as close as possible to the roller 44 and that the curvature of the transfer path on the roller 44 continues. The roller 44 and suction member 30 may be connected so that the roller 44 is sucked by the suction member 30. They can also be connected in such a way that they can be swung together or moved together. The transfer to covering 4 takes place with a further convex suction element 31. In the subsequent further transfer line the fibrous web 1 is held by a further roller as a stabilizing element 45.

Fig.3a verdeutlicht den Sicherheitsabstand S, der sich von der Stelle A, dem Ablauf der Bespannung 3 vom Stabilisierungselement 44, bis zum Beginn des zweiten Sandwichbereiches, der durch die Bespannung 3 und 4 auf dem Saugerelement 31 gebildet wird, erstreckt. 3a illustrates the safety distance S, which extends from the point A, the expiration of the fabric 3 from the stabilizing element 44, to the beginning of the second sandwich region, which is formed by the fabric 3 and 4 on the sucker element 31.

Fig.4 zeigt eine Ƥhnliche AusfĆ¼hrung wie Fig.3, bei der die konvexen Saugerelemente durch konkave Saugerelemente 32 und 34 ersetzt wurden. Die Stabilisierungselemente sind wieder als rotierende Walzen 44,45 ausgebildet. Figure 4 shows a similar embodiment as Figure 3 in which the convex suction elements have been replaced by concave suction elements 32 and 34. The stabilizing elements are again designed as rotating rollers 44, 45.

In Fig.5 ist eine AusfĆ¼hrung wie nach Fig.3 mit konvexen Saugerelementen 30,31 dargestellt, bei der nach dem als Walze ausgebildeten Stabilisierungselement 45 allerdings noch ein stehendes Stabilisierungselement 46 folgt, so dass sich auch auf der zweiten Transferstrecke ein Ć¼berwiegend oder vollstƤndig gekrĆ¼mmter Bahnlaufweg an der Bespannung 4 ergibt. Somit ist auch die Anordnung aus Saugerelement 31 und den Stabilisierungselementen 45 und 46 eine erfindungsgemƤƟe Vorrichtung.In Figure 5 is an execution like after Figure 3 shown with convex suction elements 30,31, in which after stabilizing element 45 formed as a roller but still a stabilizing element 46 follows, so that even on the second transfer path, a predominantly or completely curved path running on the fabric 4 results. Thus, the arrangement of suction element 31 and the stabilizing elements 45 and 46 is a device according to the invention.

Fig.6 zeigt wiederum eine AusfĆ¼hrung Ƥhnlich zu der nach Fig.4 mit konkaven Saugerelementen 32,34. Auch hier folgt dem als Walze ausgebildeten Stabilisierungselement 45 noch ein stehendes Stabilisierungselement 46, so dass sich ebenso auf der zweiten Transferstrecke ein Ć¼berwiegend oder vollstƤndig gekrĆ¼mmter Bahnlaufweg an der Bespannung 4 ergibt. Somit ist auch die Anordnung aus Saugerelement 34 und den Stabilisierungselementen 45 und 46 eine erfindungsgemƤƟe Vorrichtung. Figure 6 again shows an embodiment similar to the Figure 4 with concave suction elements 32,34. Here too, the stabilizing element 45 designed as a roller is followed by a stationary stabilizing element 46, so that a predominantly or completely curved path running on the covering 4 also results on the second transfer path. Thus, the arrangement of suction element 34 and the stabilizing elements 45 and 46 is a device according to the invention.

In den Figuren 3 , 4 , 5 und 6 ist das als rotierende Walze ausgefĆ¼hrte Stabilisierungselement 44 und die darauf folgende Leitwalze 17 mit Antrieb dargestellt. Weiterhin kann auch bevorzugt nur das rotierende Stabilisierungselement 44 oder besonders bevorzugt nur die Leitwalze 17 einen Antrieb aufweisen, um fĆ¼r eine ausreichende Spannung sowohl in der Bespannung als auch in der Faserstoffbahn zu sorgen. Die konvexe OberflƤche der stehenden Stabilisierungselemente und/oder der Saugerelemente kann auch durch eine Mehrzahl von quer angeordneten Leisten gebildet sein, so dass der Ć¼berwiegend gekrĆ¼mmte Bahnlaufweg in einem polygonfƶrmigen Verlauf erzielt wird.In the Figures 3 . 4 . 5 and 6 is the designed as a rotating roller stabilizing element 44 and the following guide roller 17 is shown with drive. Furthermore, preferably only the rotating stabilizing element 44 or particularly preferably only the guide roller 17 may have a drive in order to ensure sufficient tension both in the Covering as well as in the fibrous web to provide. The convex surface of the stationary stabilizing elements and / or the suction elements can also be formed by a plurality of transversely arranged strips, so that the predominantly curved track running path is achieved in a polygonal course.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
FaserstoffbahnFibrous web
22
erste Bespannungfirst stringing
33
zweite Bespannungsecond stringing
44
dritte Bespannungthird stringing
55
vierte Bespannungfourth stringing
66
fĆ¼nfte Bespannungfifth covering
77
erster Pressnipfirst press nip
88th
zweiter Pressnipsecond press nip
9, 109, 10
Pickup-SaugwalzePickup suction roll
11,1311.13
Presswalzepress roll
12, 1412, 14
Gegenwalzebacking roll
15,16,17,18,19,20,2115,16,17,18,19,20,21
Leitwalzeguide roll
2222
Antriebdrive
30, 3130, 31
konvexes Saugerelementconvex suction element
32,3432.34
konkaves Saugerelementconcave suction element
3333
konkaves weiteres SaugerelementConcave further suction element
40, 41, 42, 4640, 41, 42, 46
konvexes stehendes Stabilisierungselementconvex standing stabilizing element
43, 44, 4543, 44, 45
rotierendes Stabilisierungselementrotating stabilizing element
50,51,5250,51,52
SchmierspritzrohreLubricant sprayers
AA
Ablaufpunkt der Bespannung vom StabilisierungselementExpiration point of the covering from the stabilizing element
SS
Sicherheitsabstandsafety distance

Claims (16)

  1. Machine for producing a fibrous web, in particular a paper, board or tissue web, comprising a device for transferring and stabilizing a moving fibrous web (1), wherein, along the web running path, the fibrous web (1) is initially located in a first sandwich area between a web-delivering (2, 3) and a web-accepting fabric (3, 4), then lying only on the web-accepting fabric (3, 4) in a transfer section and after that being located between the web-accepting (3, 4) and a further fabric (4, 5) in a second sandwich area, and wherein a stationary suction element (30, 31, 32, 34) is provided on the side of the web-accepting fabric (3, 4) that faces away from the web, having at least one suction zone in the first sandwich area and at least one suction zone in the area of the transfer section, and wherein a stabilization element (40, 41, 42, 43, 44, 45, 46) with convex surface is provided on the side of the web-accepting fabric (3, 4) that faces away from the web, after the suction element (30, 31, 32, 34), so that, together with the suction element (30, 31, 32, 34), the result is a predominantly or completely curved web running path from the end of the first sandwich area at least as far as a point A which is located between 20 and 150 mm before the start of the second sandwich area, and wherein the convex curvature of the stabilization element (40, 41, 42, 43, 44, 45, 46) adjoins the curvature of the suction element (30, 31, 32, 34) preferably directly and without any straight section located in between.
  2. Machine according to Claim 1,
    characterized in that
    the point A is located between 20 and 100 mm before the start of the second sandwich area.
  3. Machine according to Claim 1 or 2,
    characterized in that
    the stabilization element (40, 41, 42, 43, 44, 45, 46) is designed such that vacuum can be applied.
  4. Machine according to Claim 3,
    characterized in that
    during operation with the fibrous web (1), a higher vacuum can be set in at least one suction zone of the suction element (30, 31, 32, 34) than in the stabilization element (40, 41, 42, 43, 44, 45, 46).
  5. Machine according to one of the preceding claims,
    characterized in that
    in the fabric loop of the web-accepting fabric (3) after the stabilization element (40, 41, 42, 43, 44, 45, 46) there is arranged a driven roll (17), around which the fabric (3) preferably wraps by at least 40%, particularly preferably at least 70%.
  6. Machine according to one of the preceding claims,
    characterized in that
    a further stationary suction element (31, 33, 34) is provided in the second sandwich area on the side of the further fabric (4) that faces away from the web.
  7. Machine according to one of the preceding claims,
    characterized in that
    the surface of the suction element (30, 31, 32, 34) and/or of the stabilization element (40, 41, 42, 43, 44, 45, 46) that comes into contact with a fabric consists of a temperature-resistant material, in particular of ceramic.
  8. Machine according to one of the preceding claims,
    characterized in that the surface of the suction element (32, 34) that faces the fabric is formed concavely and in that, on the side of the web-delivering fabric (2, 3) opposite the suction element (32, 34) there is arranged a guide roll (16), which is preferably adjustable in the vertical and/or horizontal direction.
  9. Machine according to Claim 8,
    characterized in that
    sealing strips are provided which are connected flexibly to the box of the suction element (32, 34), transversely with respect to the web running path, are able to adapt to the contour of the guide roll (16) and in particular can be pressed on.
  10. Machine according to either of Claims 8 and 9,
    characterized in that
    the suction element (32, 34) comprises a plurality of parts which are connected flexibly to one another, can adapt to the contour of the guide roll (16) and in particular can be pressed on.
  11. Machine according to one of the preceding claims,
    characterized in that
    the stabilization element is implemented as a stationary box (40, 41, 42, 43, 46).
  12. Machine according to Claim 11,
    characterized in that
    the surface of the stabilization element (40, 41, 42, 43, 46) that comes into contact with the fabric is curved with at least two different radii.
  13. Machine according to one of Claims 1 to 10,
    characterized in that
    the stabilization element is implemented as a rotating roll (44, 45), wherein the rotating roll (44, 45) can in particular be assigned a drive.
  14. Machine according to one of Claims 8 to 10 and 13,
    characterized in that
    the rotating roll (44, 45) and/or the guide roll (16) is/are equipped with a soft polymer covering or a soft polymer coating or a soft polymer surface, preferably having a softness of more than 0 P&J, particularly preferably of more than 3 P&J.
  15. Machine according to one of Claims 8 to 10 and 13 and 14,
    characterized in that
    the rotating roll (44, 45) and/or the guide roll (16) has/have an open storage volume on the surface, in particular in the form of grooves, preferably having a groove depth between 1.5 and 15 mm and preferably having a groove width between 0.5 and 2 mm.
  16. Machine for producing a fibrous web (1) according to one of the preceding claims, characterized by a press section comprising two separately located press nips (7, 8) arranged one after the other in the web running direction, which are each formed from a press roll (11, 13) in the form of a shoe press roll and a mating roll (12, 14), wherein a device for transferring and stabilizing the moving fibrous web is provided between the two press nips (7, 8), and wherein the centre of the shoe press roll (11) of the first press nip is located as high or higher than the centre of the shoe press roll (13) of the second press nip, and the centre of the mating roll (12) of the first press nip is located as high or higher than the centre of the mating roll (14) of the second press nip.
EP12733462.1A 2011-09-06 2012-07-03 Machine for producing a fibrous web comprising a device for transferring and stabilizing the fibrous web Active EP2753752B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110082159 DE102011082159A1 (en) 2011-09-06 2011-09-06 Device for transferring and stabilizing a fibrous web
PCT/EP2012/062879 WO2013034330A1 (en) 2011-09-06 2012-07-03 Device for transferring and stabilizing a fibrous web

Publications (2)

Publication Number Publication Date
EP2753752A1 EP2753752A1 (en) 2014-07-16
EP2753752B1 true EP2753752B1 (en) 2016-11-16

Family

ID=46489203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12733462.1A Active EP2753752B1 (en) 2011-09-06 2012-07-03 Machine for producing a fibrous web comprising a device for transferring and stabilizing the fibrous web

Country Status (4)

Country Link
EP (1) EP2753752B1 (en)
CN (1) CN103764907B (en)
DE (1) DE102011082159A1 (en)
WO (1) WO2013034330A1 (en)

Families Citing this family (4)

* Cited by examiner, ā€  Cited by third party
Publication number Priority date Publication date Assignee Title
AT15442U1 (en) 2015-03-26 2017-09-15 Voith Patent Gmbh press apparatus
DE102016218199A1 (en) 2016-09-22 2018-03-22 Voith Patent Gmbh Lubrication device for lubricating a belt
CN110612370B (en) * 2017-05-10 2022-01-28 ē¦ä¼Šē‰¹äø“åˆ©ęœ‰é™å…¬åø Production device and method for producing a fibrous web
KR101912591B1 (en) * 2018-06-18 2018-10-31 ģ£¼ģ‹ķšŒģ‚¬ ģ‚¼ģš°ė””ķ‹°ķ”¼ Coating device for dyeing processing

Family Cites Families (2)

* Cited by examiner, ā€  Cited by third party
Publication number Priority date Publication date Assignee Title
EP2217759B1 (en) * 2007-11-19 2011-06-29 Metso Paper, Inc. Device for transferring a paper web from a supporting fabric to another
FI127367B (en) 2008-03-28 2018-04-30 Valmet Technologies Inc Transfer suction box in a machine with fiber web

Non-Patent Citations (1)

* Cited by examiner, ā€  Cited by third party
Title
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Also Published As

Publication number Publication date
DE102011082159A1 (en) 2013-03-07
CN103764907A (en) 2014-04-30
EP2753752A1 (en) 2014-07-16
WO2013034330A1 (en) 2013-03-14
CN103764907B (en) 2015-09-16

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