EP2678471B1 - Section de presse d'une machine à fabriquer une bande de matière fibreuse - Google Patents

Section de presse d'une machine à fabriquer une bande de matière fibreuse Download PDF

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Publication number
EP2678471B1
EP2678471B1 EP11779404.0A EP11779404A EP2678471B1 EP 2678471 B1 EP2678471 B1 EP 2678471B1 EP 11779404 A EP11779404 A EP 11779404A EP 2678471 B1 EP2678471 B1 EP 2678471B1
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Prior art keywords
pressure
nip
roll
felt
pressing
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EP11779404.0A
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German (de)
English (en)
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EP2678471A1 (fr
Inventor
Daniel Gronych
Ute Lukschanderl
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the invention relates to a press section for dewatering in a machine for producing a fibrous web, in particular a paper, board or tissue web, with a shoe press nip formed by a press roll and a counter roll, wherein the press roll a rotating flexible jacket, a supporting stationary yoke, a pressing member and pressing means, and wherein the pressing means press the pressing member to the jacket and thus the jacket to the counter roll.
  • the fibrous web is passed through the nip together with a felt or between two felts.
  • a felt or between two felts By the pressing force with which the press roll and the counter roll are pressed against each other, water from the web is pressed into the felt.
  • Such a press section is known for example from the document EP 1072721 A1 , which describes a press section with only a single shoe press nip. It is also described that after the shoe press nip on the press felt a channel for collecting the squeezed out water, which is thrown off the jacket of the press roll, is provided.
  • the shoe press nip has an extended compared to simple Walzenpressnips press zone.
  • the nip length is synonymous with the length of the press zone, which is given by the pressing element, the so-called shoe.
  • the jacket is provided with grooves or blind holes. For very high dewatering volumes, an ever-increasing storage volume is needed and therefore coats with blind holes or with a combination of blind holes and grooves are used. At the same time, however, the coat must not mark with its pattern, whereby the optimization is limited.
  • the object of the invention is now to provide an improved press section for efficient drainage of higher amounts of water with as few press nips.
  • the shell of the press roll is grooved, wherein the length of the grooves in the circumferential direction is greater than the nip length, and characterized in that in the web running direction in front of the shoe press nip on the side of the press roll a drip pan is provided.
  • a high hydraulic pressure is generated, so that water also splashes against the web running direction in larger quantities from the nip.
  • the grooves in the web running direction must be longer than the nip length.
  • the water is injected back evenly over the web width, so that no displacements and no uneven drainage occur.
  • the water jet must now also be collected in a suitable collecting trough, so that the water can not flow back onto the felt and thus no deterioration of the moisture cross profile occurs.
  • the press section has only a single press nip and thus all water must be squeezed out in this shoe press nip.
  • the pressing element according to the invention is designed so that a pressure profile with a steep gradient in the inlet third, ie in the first third of the nip length, is generated.
  • the gradient G in the upstream third is described by the ratio of the pressure p after one third of the nip length to the peak pressure p max in the pressure profile based on the ratio 1/3.
  • the width of the grooves transversely to the web running direction is preferably 0.5-2 mm, so that there is no danger of marking the fibrous web. Furthermore, the Mantel prefers no blind holes to use the effect as well as possible.
  • the so-called tray drainage can be intensified in high-speed paper machines and can only be achieved at slow speeds.
  • trough drainage is called when the squeezed water is not transported mainly in felts from the nip and discharged to suction elements, but when the squeezed water is transported in the storage volume of the shell and the backing roll from the nip and then thrown into drip trays. This is particularly efficient because it reduces the rewet from a felt to the fibrous web.
  • the fibrous web can be more compacted overall, which in some paper webs such. Newsprint or packaging paper is desired to achieve a high nip strength.
  • the press section has a further shoe press nip, which is preferably downstream of the shoe press nip according to the invention in the web running direction, for example in so-called tandem presses, the total dewatering performance can be increased and thus drying energy can be saved in a subsequent dryer section.
  • the invention can be used particularly positively in press sections in which the shoe press nip is designed for a pressing force of at least 600 kN / m, preferably of at least 800 kN / m, since particularly much water is obtained here.
  • the press roll is arranged above the paper web and the counter roll below the paper web.
  • the shoe press nip is covered with two felts, a top felt and an underfelt, and the fibrous web between these two felts is passed through the nip.
  • the felt or felts can also be designed as drainage tapes.
  • the invention is also applicable if only one felt is present. Second, an impermeable belt may then be provided.
  • the shoe press nip is covered with a first felt, which lies in the nip between the fibrous web and press roll and which is designed with a predominantly non-woven basic structure, a so-called scrim, wherein the basic structure at least two layers, preferably at least three Has layers. Due to the relatively tightly packed non-woven basic structure in contrast to fabrics, a low internal storage volume in the felt is achieved. This promotes the drainage of the water from the felt into the grooves of the shell and enhances backfeeding against the web running direction. Such a type of felt is also referred to as a tub drainage type.
  • the basic structure should contain at least 2/3 non-woven portion and only a small amount of woven structure. The basic structure is responsible for the tensile strength of the felt in the web running direction and across the web running direction.
  • the shoe press nip is covered with a second felt which lies in the nip between the fibrous web and the counter-roller and which is designed with a predominantly woven basic structure, the basic structure having at least two layers, preferably at least three layers.
  • a second felt which lies in the nip between the fibrous web and the counter-roller and which is designed with a predominantly woven basic structure, the basic structure having at least two layers, preferably at least three layers.
  • Such felts are also referred to as a tube trough dewatering type.
  • a third layer may be provided, which is formed as a membrane, that is, as a perforated or perforated polymer film, or as a random web, that is, as a nonwoven without preferred fiber orientation.
  • the third layer can be arranged between the two thread layers of the basic structure or above or below the two thread layers. If the third layer is a random web, it is also possible for one or both thread layers to be embedded in the random web.
  • a first felt, together with the fibrous web and a second felt should wrap around the backing roll, at a length of at least 30 mm prior to the beginning of the nip, i. the press zone between press roll and counter roll.
  • a second felt should wrap around the mating roll at an angle of at least 10 ° relative to the backing roll before the nip begins.
  • the drip pan should have a jammed edge, so that no water can flow back from the tub, and it should have a drain and preferably also a suction, so that the water and possibly also spray can be reliably dissipated.
  • the trough preferably has a gradient behind the edge of the stowage, so that the water flows away from the shoe press nip. Furthermore, it makes sense for the removal of the large amount of water sprayed back against the web running direction, if the flow is so large that a quantity of water of at least 20 l per minute and per meter web width, preferably dissipated by at least 30 l per minute and per meter web width can be.
  • this corresponds to at least 160 l / min, preferably at least 240 l / min.
  • this corresponds to a proportion of more than 10%, preferably more than 16% based on the total in the press section squeezed amount of water.
  • the amount of water flowing back against the web running direction should preferably amount to at least 15%, particularly preferably at least 20%, of the total amount of water squeezed out upward.
  • the drip tray In order to be able to catch as much of the back-splashed water, the drip tray should have an inlet edge which has at most 20 mm, preferably at most 10 mm distance from a first felt. This is made possible by a corresponding arrangement of the drip pan.
  • the entire drip pan and / or the inlet edge is adjustable.
  • suitable pivoting and adjusting devices can be provided.
  • the distribution of the squeezed amount of water upwards and downwards or forwards and backwards depends strongly on the pressing force, the production speed and the basis weight of the fibrous web.
  • An additional possibility to contribute to a desired high hydraulic pressure in the grooves of the shell at the beginning of the shoe press nip is, when a smaller depth of the grooves is used of at most 1.5 mm, preferably at most 0.9 mm, particularly preferably 0, 7 mm.
  • a larger pressure pulse at the beginning can also be achieved if the pressing element is designed such that a two-zone pressure profile with two local pressure maxima can be generated, wherein the second pressure maximum in the web running direction should be higher than the first pressure maximum in order to achieve a good overall dewatering performance , Between the two pressure maxima, the pressure should be at least 5%, preferably at least 10%, particularly preferably at least 15% below the value of the first maximum pressure in a partial region.
  • the pressing element is preferably a continuous shoe width over the width of the web, which is pressed by a plurality of pressing elements, which are arranged side by side in the web running direction, is pressed.
  • the pressing elements are generally preferred hydraulic pressure elements.
  • the pressure profile can be adapted to different operating conditions.
  • These different operating conditions can be caused for example by changes in the basis weight of the fibrous web, the speed, the pressing force, the felt or the fiber raw material.
  • the pressing element can be advantageously pressed by at least two rows of pressing elements, which are arranged one behind the other in the web running direction. This allows the pressure profile adjusted accordingly become. This is especially true when a bending soft executed in the web running direction pressing element is used.
  • the pressing element can consist of two pressing elements which can be pressed against one another and are arranged one behind the other in the direction of web travel.
  • this solution is advantageous.
  • the shoe press nip 8 is formed by the upper press roll 2 and the lower counter roll 3.
  • the pressing element 4 shown here only in one piece is pressed by the pressing elements, not shown, from the inside against the mantle and thus produces an extended press nip.
  • the fibrous web 1 runs together with the first felt 5 and the second felt 6 through the press nip and is dehydrated there.
  • the pressed out by the special design of the grooved jacket of the press roll 2 already at the beginning and sprayed back against the web running direction water is in collected the drip pan 10.1 and derived via the drain 12.1. Any resulting spray mist is sucked out via the exhaust 14.1.
  • the drip pan is pivotable and adjustable via the adjusting 15.1 and 16.1.
  • the further collecting trough 20.1 surrounds the pressing roller 2 on a large part of the circumference, as is often found in conversions. Since the counter-roller 3 and the second felt 6 eject water, even after the counter-roller 3 below the felt 6 yet another, not shown here collecting tray can be provided.
  • Fig.2 shows a section with details of the drip pan 10.2. Shown is the storage edge 11, which prevents water can flow back to the felt 5 and the fibrous web 1, and the adjoining slope until the expiry 12.2.
  • the leading edge 13 has a distance c from the first felt 5.
  • the second felt 6 wraps around the counter roll 3 at an angle ⁇ before the beginning of the shoe press nips 8, synonymous with the press zone between the pressing element 4 and coat 7 of the press roll 2 and the counter roll 3. Der first felt 5 wraps together with the fibrous web 1 and the second felt 6, the counter roll 3 over a length b.
  • FIG. 3 represented a further embodiment of the invention, in which the drip pan 10.3 is combined in front of the shoe press nip 8 with the drip pan 20.3 after the shoe press nip 8.
  • the entire press roller 2 enclosed. It is advantageous if, as shown in the illustration, both collecting trays 10.3, 20.3 are adjustable. Serve the adjustment 15.3, 16.3, 25.3, 26.3.
  • a further collecting trough can be additionally provided after the counter-roller 3 on the underside of the second felt 6.
  • Figure 4 shows yet another embodiment with a drip pan 10.4 after the shoe press nip and another drip pan 20.4 in front of the shoe press nip, which is smaller, as you could provide for a new construction of a press section.
  • This version can be built very compact.
  • FIG. 5a and 5b Examples of a basic structure of a felt are shown.
  • 5a shows a nonwoven structure, a scrim of two layers 9a, 9b.
  • the layers are formed from threads which may consist of several monofilaments of twisted individual threads or consisting of multifilament threads or of multifilament threads.
  • 5 b shows in contrast a woven basic structure of a felt, also two-ply 9c, 9d.
  • a basic structure with two layers of thread and a third layer, which is formed as a membrane, or as a random web, is not shown separately, but can also be provided according to the invention.
  • 5c schematically represents a possible construction of a felt.
  • a three-layer non-woven basic structure 9a ', 9b', 9e and on the top and bottom each have a nonwoven layer 9f, 9f ', which itself may consist of several layers. It can be provided between the nonwoven layer 9f, 9f 'and the basic structure also further intermediate layers. Again, an additional membrane or a random web may be arranged in, on or under the basic structure, which are not shown.
  • In 6a is an example of a pressure profile p with steep gradient G shown in the upstream third. After one third of the nip length L, a pressure p1 / 3 is reached, which is disproportionate.
  • Figure 6b represents a possibility for a two-zone pressure profile p ', with a first local pressure maximum p max ' and a second local and at the same time absolute pressure maximum p max .
  • the first local pressure maximum ensures the controlled back-splash at the beginning of the nip and the second part of the pressing element, which together form the nip length L ', or a flexible pressing element with the nip length L', the height of the two local maxima can be controlled, so that an optimal dewatering is achieved,
  • a steep gradient G is preferably used between the first and the second local pressure maximum, there is an area in which the pressure is at least 5%, preferably at least 10%, particularly preferably at least 15% lower than the first pressure maximum p max '.

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Claims (14)

  1. Section de presse d'une machine à fabriquer une bande de matière fibreuse (1), pour égoutter notamment une bande de papier, de carton ou de papier tissu, comprenant une zone de pinçage à sabot (8) formée d'un rouleau de presse (2) et d'un rouleau conjugué (3), le rouleau de presse (2) présentant une enveloppe flexible périphérique (7), un joug stationnaire porteur, un élément de presse (4) et des dispositifs de pressage, et les dispositifs de pressage pressant l'élément de presse (4) contre l'enveloppe (7) et de ce fait l'enveloppe (7) contre le rouleau conjugué (3), et une cuve de réception (20.1, 20.3, 20.4) étant prévue après la zone de pinçage à sabot (8) dans le sens de mouvement de la bande, et une cuve de réception (10.1, 10.2, 10.3, 10.4) étant prévue avant la zone de pinçage à sabot (8) du côté du rouleau de pressage (2), l'enveloppe (7) étant rainurée,
    caractérisée en ce que la section de presse présente seulement une zone de pinçage unique, à savoir la zone de pinçage à sabot (8), et la longueur des rainures dans la direction périphérique est supérieure à la longueur de la zone de pinçage (L), et l'élément de presse (4) est réalisé de telle sorte qu'un profil de pression (p, p') puisse être produit dans la direction d'avance de la bande, lequel présente un gradient G dans le tiers côté entrée tel qu'au moins G = 1,35, G étant défini par G = (p1/3/pmax) / (1/3), p1/3 étant la pression après un tiers de la longueur de la zone pinçage (L) et pmax étant la pression de pointe dans le profil de pression (p, p').
  2. Section de presse selon la revendication 1,
    caractérisée en ce que
    la zone de pinçage à sabot (8) est tendue d'un premier feutre (5) qui est situé entre la bande de matière fibreuse (1) et le rouleau de presse (2), le premier feutre (5) étant réalisé avec une structure de base essentiellement non-tissée, que l'on appelle un canevas, et la structure de base présentant au moins deux couches (9a, 9b), de préférence au moins trois couches (9a', 9b', 9e).
  3. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la zone de pinçage à sabot (8) est tendue d'un deuxième feutre (6) qui est situé entre la nappe de matière fibreuse (1) et le rouleau conjugué (3), le deuxième feutre (6) étant réalisé avec une structure de base essentiellement tissée, et la structure de base présentant au moins deux couches (9c, 9d), de préférence au moins trois couches.
  4. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce
    qu'un premier feutre (5) conjointement avec la bande de matière fibreuse (1) et un deuxième feutre (6) entourent le rouleau conjugué (3) déjà avant le début de la zone de pinçage à sabot (8) entre le rouleau conjugué (3) et le rouleau de presse (2), à savoir sur une longueur (b) d'au moins 30 mm.
  5. Section de presse selon la revendication 3 ou 4,
    caractérisée en ce que
    le deuxième feutre (6) entoure le rouleau conjugué (3) déjà avant le début de la zone de pinçage à sabot (8) entre le rouleau conjugué (3) et le rouleau de presse (2), à savoir suivant un angle (α) d'au moins 10° par rapport au rouleau conjugué (3).
  6. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la cuve de réception (10.1, 10.2, 10.3, 10.4) disposée avant la zone de pinçage à sabot (8) présente une arête de retenue (11) et un écoulement (12.1, 12.2, 12.3, 12.4) et de préférence également une aspiration (14.1).
  7. Section de presse selon la revendication 6,
    caractérisée en ce que
    l'écoulement (12.1, 12.2, 12.3, 12.4) est réalisé sous forme suffisamment grande pour qu'une quantité d'eau d'au moins 20 1 par minute et par mètre de largeur de bande, de préférence d'au moins 30 1 par minute et par mètre de largeur de bande soit évacuée.
  8. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la cuve de réception (10.1, 10.2, 10.3, 10.4) disposée avant la zone de pinçage (8) comprend une arête d'entrée (13), la cuve de réception étant disposée ou ajustable de telle sorte que l'arête d'entrée (13) présente une distance d'au plus 20 mm, de préférence d'au plus 10 mm, au premier feutre (5).
  9. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'élément de presse (4) est réalisé de telle sorte qu'un profil de pression (p, p') puisse être produit dans la direction d'avance de la bande, lequel présente un gradient G dans le tiers du côté de l'entrée d'au moins G = 1,50, de préférence d'au moins G = 1,80.
  10. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la profondeur des rainures de l'enveloppe (7) vaut au plus 1,5 mm, de préférence au plus 0,9 mm, particulièrement préférablement au plus 0,7 mm.
  11. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'élément de presse (4) est réalisé de telle sorte qu'un profil de pression à deux zones (p') avec deux maxima de pression locaux puisse être généré, le deuxième maximum de pression dans la direction d'avance de la bande étant supérieur au premier maximum de pression.
  12. Section de presse selon la revendication 11,
    caractérisée en ce que
    l'élément de presse (4) est réalisé de telle sorte qu'un profil de pression (p, p') puisse être produit, pour lequel la pression dans une région partielle entre le premier maximum de pression et le deuxième maximum de pression soit inférieure d'au moins 5 %, de préférence d'au moins 10 %, particulièrement préférablement d'au moins 15 %, au premier maximum de pression.
  13. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce
    qu'au moins deux rangées d'éléments de pressage, disposés les uns derrière les autres dans la direction d'avance de la bande, sont prévues, lesquelles pressent l'élément de presse (4) contre l'enveloppe (7).
  14. Section de presse selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'élément de presse (4) se compose de deux éléments de presse partiels pouvant être pressés différemment l'un de l'autre, disposés l'un derrière l'autre dans la direction d'avance de la bande.
EP11779404.0A 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse Active EP2678471B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011004565A DE102011004565A1 (de) 2011-02-23 2011-02-23 Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn
PCT/EP2011/069519 WO2012113467A1 (fr) 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse

Publications (2)

Publication Number Publication Date
EP2678471A1 EP2678471A1 (fr) 2014-01-01
EP2678471B1 true EP2678471B1 (fr) 2018-03-14

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Country Link
EP (1) EP2678471B1 (fr)
CN (1) CN103403252B (fr)
DE (1) DE102011004565A1 (fr)
WO (1) WO2012113467A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
CN104818643B (zh) * 2015-05-12 2017-11-28 宁波亚洲浆纸业有限公司 用于靴式压榨的接水槽、靴式压榨装置及纸机
DE102017117227A1 (de) * 2017-07-31 2019-01-31 Voith Patent Gmbh Pressmantel und dessen Verwendung sowie Presswalze und Schuhpresse
DE102018119381A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Pressanordnung
CN109594394B (zh) * 2018-12-28 2020-11-17 苏州市相城区阳澄产业园发展有限公司 一种利用吸除浆湿翻转防变形压榨辊造纸机装置
US12060681B2 (en) 2019-05-03 2024-08-13 Voith Patent Gmbh Seamed felt and use of the seamed felt in a tissue machine
DE102019111441A1 (de) * 2019-05-03 2020-11-05 Voith Patent Gmbh Bespannung und Verwendung in einer Tissuemaschine
CN114960246A (zh) * 2022-06-06 2022-08-30 刘小贺 一种纤维素基复合抗菌材料的制备方法

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DE3410172C2 (de) 1983-03-23 1995-11-09 Valmet Paper Machinery Inc Langspaltpresse einer Papiermaschine
EP0854228A2 (fr) 1996-12-20 1998-07-22 Voith Sulzer Papiermaschinen GmbH Section de pressage
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DE19939893A1 (de) 1999-08-23 2001-03-01 Voith Paper Patent Gmbh Pressenanordnung
US6428874B1 (en) 2000-11-03 2002-08-06 Albany International Corp. Grooved long nip shoe press belt
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Also Published As

Publication number Publication date
CN103403252A (zh) 2013-11-20
DE102011004565A1 (de) 2012-08-23
EP2678471A1 (fr) 2014-01-01
CN103403252B (zh) 2016-08-17
WO2012113467A1 (fr) 2012-08-30

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