EP2678471A1 - 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

Info

Publication number
EP2678471A1
EP2678471A1 EP11779404.0A EP11779404A EP2678471A1 EP 2678471 A1 EP2678471 A1 EP 2678471A1 EP 11779404 A EP11779404 A EP 11779404A EP 2678471 A1 EP2678471 A1 EP 2678471A1
Authority
EP
European Patent Office
Prior art keywords
press
nip
press section
web
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11779404.0A
Other languages
German (de)
English (en)
Other versions
EP2678471B1 (fr
Inventor
Daniel Gronych
Ute Lukschanderl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2678471A1 publication Critical patent/EP2678471A1/fr
Application granted granted Critical
Publication of EP2678471B1 publication Critical patent/EP2678471B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • 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 Schuhpressnip formed from a press roll and a counter roll, wherein the press roll to a current flexible jacket, a supporting stationary yoke , A pressing element and pressing means, and wherein the pressing means press the pressing member to the shell 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 jackets are used with blind holes or with a combination of blind holes and grooves.
  • the coat must not mark with its pattern, whereby the optimization is limited.
  • the pressing force is too high or the press nip is overloaded hydraulically, water may splash out of the nip uncontrollably, which is always avoided as undesirable since this adversely affects the moisture profile or causes the paper web to slip.
  • the water in the nip should be pressed into the cavities of the shell and the felt and be thrown off the nip or sucked out of the felt.
  • coats with a large storage volume have always been developed for high dewatering volumes in order to achieve a low hydraulic pressure in the nip.
  • 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 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 transported in the storage volume of the shell and the backing roll from the nip and then spun in 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 present invention has a particularly advantageous effect if the press section has only a single press nip and thus all water in this nip press must be squeezed out. As a result, investment and operating costs can be saved, and nevertheless a high dewatering performance can be achieved.
  • 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 N ip between the fibrous web and press roll and which is executed with a predominantly non-woven basic structure, a so-called scrim, the basic structure m least two layers, preferably has at least three 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 1 0 ° relative to the backing roll before the nip begins.
  • the drip pan should have a jammed edge so that no water can flow back out of the sump, and it should have an outlet, and preferably also a suction, so that the water and possibly also spray mist can be reliably removed.
  • 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 sequence is so large that a quantity of water of at least 20 I 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 1 60 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. It is advantageous if the entire drip pan and / or the inlet edge is adjustable. For this purpose, suitable pivoting and adjusting devices can be provided.
  • the back-injected amount of water can be increased. This is possible when the pressing element 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 to one third of the nip length to the peak pressure p max in the pressure profile based on the ratio 1/3.
  • 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 in a partial region should be at least 5%, preferably at least 10%, particularly preferably 1 5% by the second highest pressure maximum.
  • 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 various operating conditions may, for example, arise from variations 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.
  • FIG. 4 shows yet another embodiment of a press section according to the invention
  • FIG. 5 a shows a schematic diagram of a basic structure that is woven in the same way
  • Fig.5b is a schematic plan view of a woven basic structure with two layers
  • Fig.5c schematic cross section of a felt with non-woven
  • Fig.6b Example of a two-zone pressure profile with two local pressure maxima The figures are described in more detail below.
  • the shoe press 8 is formed from the top press roll 2 and the bottom roll 3 at the bottom.
  • 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 devices 15.1 and 16.1.
  • 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 Fi lz 5 wraps together with the fibrous web 1 and the second felt 6, the counter roll 3 over a length b.
  • FIG. 3 represents a further embodiment according to the invention, in which the collecting trough 10.3 in front of the shoe press nip 8 is combined with the collecting trough 20.3 downstream of 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 devices 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.
  • Fig.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.
  • FIGS. 5a and 5b show examples of a basic structure of a felt.
  • 5a shows a non-woven 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.
  • FIG. 5 b in contrast, shows a woven basic structure of a felt, likewise two-ply 9 c, 9 d.
  • FIG. 5c schematically illustrates a possible construction of a felt.
  • FIG. 6 a shows an example of a pressure profile p with a steep gradient G in the inlet-side third. After one third of the nip length L, a pressure p1 / 3 is reached, which is disproportionate.
  • the gradient G is defined as
  • FIG. 6b illustrates a possibility for a two-zone pressure profile p ', with a first local pressure maximum p max ' and a second local and simultaneously absolute pressure maximum p max .
  • the first local pressure maximum ensures the controlled back-splash at the beginning of the nip
  • the height of the two local maxima can be controlled so that optimal drainage is achieved.
  • a steep gradient G is preferably used.
  • Pressure maximum there is a range in which the pressure is at least 5%, preferably at least 10%, more preferably at least 15% lower than the first pressure maximum p max '.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une section de presse d'assèchement dans une machine à fabriquer une bande de matière fibreuse (1), en particulier une bande de papier, de carton ou de papier mousseline, comprenant une ligne de contact de pressage à sabot (8) formée d'un cylindre de pressage (2) et d'un contre-cylindre (3), le cylindre de pressage (2) présentant une enveloppe flexible périphérique, un étrier porteur stationnaire, un élément de pressage (4) et des dispositifs de serrage, ces derniers serrant l'élément de pressage (4) contre l'enveloppe (7) et donc l'enveloppe (7) contre le contre-cylindre (3) et une cuvette collectrice (20.1, 20.3, 20.4) étant disposée après la ligne de contact de pressage à sabot (8) dans la direction de défilement de la bande; l'enveloppe (7) est cannelée, la longueur des cannelures dans la direction périphérique étant plus grande que la longueur de la ligne de contact (L) et une cuvette collectrice (10.1, 10.2, 10.3, 10.4) est disposée avant la ligne de contact de pressage à sabot (8) sur le côté du cylindre de pressage (2) de sorte qu'une grande quantité d'eau est projetée de la ligne de contact de pressage à sabot dans le sens inverse au sens de défilement de la bande et contribue à améliorer la capacité d'assèchement.
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 true EP2678471A1 (fr) 2014-01-01
EP2678471B1 EP2678471B1 (fr) 2018-03-14

Family

ID=44910215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11779404.0A Active EP2678471B1 (fr) 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse

Country Status (4)

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

Cited By (1)

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CN104818643A (zh) * 2015-05-12 2015-08-05 宁波中华纸业有限公司 用于靴式压榨的接水槽、靴式压榨装置及纸机

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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
WO2020224835A1 (fr) * 2019-05-03 2020-11-12 Voith Patent Gmbh Feutre piqué et utilisation de feutre piqué dans une machine à papier à usage sanitaire et domestique
DE102019111441A1 (de) * 2019-05-03 2020-11-05 Voith Patent Gmbh Bespannung und Verwendung in einer Tissuemaschine

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Publication number Priority date Publication date Assignee Title
CN104818643A (zh) * 2015-05-12 2015-08-05 宁波中华纸业有限公司 用于靴式压榨的接水槽、靴式压榨装置及纸机

Also Published As

Publication number Publication date
WO2012113467A1 (fr) 2012-08-30
DE102011004565A1 (de) 2012-08-23
CN103403252B (zh) 2016-08-17
CN103403252A (zh) 2013-11-20
EP2678471B1 (fr) 2018-03-14

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