WO2004079090A1 - Procede et dispositif de compression d'une bande de papier - Google Patents

Procede et dispositif de compression d'une bande de papier Download PDF

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Publication number
WO2004079090A1
WO2004079090A1 PCT/FI2004/050022 FI2004050022W WO2004079090A1 WO 2004079090 A1 WO2004079090 A1 WO 2004079090A1 FI 2004050022 W FI2004050022 W FI 2004050022W WO 2004079090 A1 WO2004079090 A1 WO 2004079090A1
Authority
WO
WIPO (PCT)
Prior art keywords
loading
nip
shoe element
pivot
loading means
Prior art date
Application number
PCT/FI2004/050022
Other languages
English (en)
Inventor
Markus Laitila
Original Assignee
Metso Paper, Inc.
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
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to DE112004000357T priority Critical patent/DE112004000357T5/de
Publication of WO2004079090A1 publication Critical patent/WO2004079090A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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

Definitions

  • the invention relates to a method for pressing a paper web, in which the paper web is guided through a nip formed between a moving ele- ment forming a flexible, endless structure and a counter roll, of which the moving element is a flexible shell or a belt loop, wherein the moving element is supported in the area of the nip against another roll from inside the roll with a shoe element.
  • the invention also relates to a press device for a paper web.
  • the term paper web also refers to such webs made of pulp, the basis weight of which is within a range where products are usually called by the term paperboard.
  • the paper web formed in the wire section is pressed at two points in the line of making paper or paperboard: in the press section, in which water is removed from the wet paper web by pressing, and in the calender, in which the surface is finished by applying pressure on the already relatively dry paper web.
  • a nip is formed by combining a soft- faced roll and a hard roll, which nip has some extension in the longitudinal direction of the machine, and thus the paper web to be calendered has a long retention time in the calender nip.
  • the shell of the soft-faced roll is made of a flexible belt
  • the hard-faced roll is a metal roll, which is a heated roll functioning as a thermoroll that brings heat to the web in the calendering.
  • the shell of the soft roll is loaded from inside the roll against the hard roll by a loading shoe, and as a result of this, the paper web travelling along the surface of the hard roll is pressed at a given pressure between the surfaces of the soft shell and the hard roll over a long distance in the nip.
  • the elastic shell can be compressed in its thickness direction in the area of the nip.
  • the belt forming the shell of the soft roll can be made of a suitable elastic polymer, such as polyurethane, and inside the belt there is a fabric that reinforces the same.
  • the calender is especially well suited for on-line calendering of printable paper or paper- board grades.
  • Said calender type is called a shoe calender, and it is known by the trademark "OptiDwell”.
  • OptiDwell One further embodiment of the same is described in the international publication WO 99/28551.
  • Extended nip presses comprising a shoe element with a concave surface in the press section, in turn, are disclosed in the Finnish patent 98843 and e.g. in the corresponding US patent 5,908,536, in the US patents 5,084,137, 5,262,011 , 5,639,351 , and in the international publication WO 99/19562.
  • hose roll inside a so-called hose roll there is a shoe element which is loaded against the inner surface of a flexible roll shell with a given force, and the web is guided together with one or two press felts through a nip formed between the hose roll and a counter roll.
  • the Finnish patent 65103 and the corresponding US patent 4,713,147 disclose a method for changing the location of the centre of gravity of the support force of the shoe element in the machine direction, wherein the distribution of the dewatering pressure in the longitudinal direction of the nip can be changed.
  • this idea is implemented by providing parallel pressurized fluid hoses, which load the shoe, with unequal pressures which can be adjusted independently of each other.
  • the method is primarily characterized in that the shoe element is supported, in the machine direction, at a first point to a fixed pivot and at a second point to a loading means, whose force effects the loading of the shoe element and, correspondingly, the pressure in the nip and the movement of the shoe element, with the pivot as a fulcrum.
  • the pivot is located in a fixed position with respect to the moving element passing through the nip and over the surface of the shoe element.
  • the pivot is supported to a stationary frame structure, such as the stationary shaft of the shoe roll.
  • the loading means which can be a uniform loading hose, or the like, extending in the cross-machine direction, or a row of loading cylinders extending in the cross-machine direction.
  • an adjustable tilt by which the pressure curve of the nip (the pressure distribution in the longitudinal direction of the nip) can be changed during the operation.
  • the shoe element can be designed to have such a surface facing the nip that it takes into account the turning movement taking place in relation to said pivot in the horizontal plane (in the plane perpendicular to the axes of the rolls).
  • the press device in turn, is characterized in that the shoe element is, in the machine direction, supported at a first point to a fixed pivot and at a second point to a loading means which is arranged to cause the loading of the shoe element in the direction towards the nip and the movement in relation to said pivot.
  • the loading means can be a hose placed in the cross-machine direc- tion, having an effect on the shoe element at substantially one point in the machine direction, and containing a pressurized medium whose pressure determines the loading force, or it can be a row of loading cylinders extending in a similar manner in the cross-machine direction, the loading being similarly caused by the pressure of the pressurized medium inside the cylinders.
  • the loading means may be supported to a stationary frame, in relation to which the pivot is also in a fixed position.
  • the shoe element may be fixed to a support plate, said loading means being provided at its opposite side and one edge of the support plate being arranged pivotable around said pivot.
  • the arrangements can be applied both in the press nips of the press section and in the calender nips of the calender, even though there are differences in the aforementioned sections of the papermaking process.
  • a considerable increase in the dry matter content takes place in the press section, in the press nips after the wire section typically from the level of 16 to 25 % to the level of 42 to 55 %.
  • the dry matter content of the ingoing paper is typically at least 85 %.
  • the flexible element which can be the shell of a so-called "hose roll” or a belt forming an endless loop, is capable of conforming to the shape of the guiding supporting surface of the shoe element when it travels over the surface.
  • the concept of an elast c moving element refers to such a shell or a looped belt that s capable of deforming under the effect of the loading pressure effecti ve in the nip, and produces a nip which extends in the travel direction of the web.
  • the loading means loads the shoe against a counter roll on the oppo- site side of the nip and thus affects the nip pressure.
  • the loading means is adjustable in a known manner, wherein it is possible to adjust the magnitude of the loading and thereby the nip pressure level.
  • Fig. 1 shows a side-view of a calender in which the invention can be used
  • Fig. 2 shows a side-view of an advantageous embodiment for arranging the loading in the calender of Fig. 1 ,
  • Fig. 3 shows a side-view of a second embodiment
  • Fig. 4 shows a side-view of a third embodiment
  • Fig. 5 shows a side-view of a fourth embodiment.
  • Fig. 1 shows a calender in which the invention can be used.
  • the paper web W is guided through a calender nip N formed between two rolls.
  • the lower first roll 1 comprises a shell 1 a made of an elastic flexible material, which rotates around the rotating axis of the calender roll.
  • the upper second roll 2 is a heated calender roll with a hard surface, for example a roll equipped with a metal shell, the surface of which is harder than the elastic flexible material of the shell.
  • the shell 1a that is elastic in its thickness direction (in the direction of the radius of the calender roll 1) is compressed in the shape defined by the shoe element 3 guiding the shell from inside and the surface of the second roll 1, thereby forming an extended nip N, in which the web W travels between the surface of the second roll 2 and the surface of the com- pressed shell 1a of the first roll 1.
  • the surface of the shoe element 3 that guides the shell is convex, and it forms a part of a cylinder extending in the direction of the rotation axis of the calender, whose radius of curvature and the corresponding centre of curvature is on the side of the first roll 1 from the nip N.
  • the radius of curvature R equals the inner radius of the first roll 1 , i.e. the centre of curvature and the rotation axis of the cylinder coincide.
  • the guiding surface of the shoe element 3, over which the shell 1a slides, may also be straight or concave, wherein in the latter case, the centre of curvature of the surface is on the side of the second roll 2.
  • the shoe element 3 is loaded against the inner surface of the shell 1a by a loading means which exerts an adjustable loading force F on the shoe element 3.
  • the loading means and the fixing of the shoe element 3 will be discussed below, that is, the cylinders can be hydraulic cylin- ders.
  • the loading means is supported to an axial supporting element E inside the roll 1.
  • Figure 2 shows the mounting of the shoe element 3 in more detail.
  • the shoe element 3 is arranged pivotable with respect to the pivot P in the horizontal plane.
  • the pivot P is supported to a support element E. Mechanically, the shoe element 3 moves in such a way in relation to the pivot P that the points of its supporting surface facing the nip move along circular paths with the pivot P as their centre point.
  • the shoe element 3 is mounted in such a way in relation to the pivot that it forms a kind of a single-arm lever whose fulcrum is said pivot P, the supporting surface of the shoe element 3 being on the same side of the pivot P.
  • the forces of the supporting surface at different points in its longitudinal direction (machine direction) are thus determined according to the torque calculated in relation to the pivot P.
  • the movement and simultaneously the loading force are produced by a loading means 4 effective between the shoe element 3 and the support element E.
  • the loading means 4 is located at a distance from the pivot P in the machine direction (direction of movement of the shell 1a).
  • the loading means 4 is an expanding loading hose placed in the cross-machine direction and containing a pressurized medium, preferably a fluid.
  • the mounting and support of the shoe element 3 are implemented by fixing it to a support plate 5, and the loading hose used as the loading means 4 on the opposite side of the plate is placed between the support plate 5 and the support element E.
  • the edge of the support plate is connected to the support element E by means of a joint which forms the above mentioned pivot P.
  • the shape of the shoe is concave, and it can be designed by taking into account the non-linear or "rotational" character of the loading movement.
  • the load return movement to the rest position can be effected, in the hose loading of Fig. 2, by means of gravity or, if necessary, by means of return springs (not shown).
  • the loading means 4 can also be used to adjust the tilting of the shoe element 3 in relation to a straight line parallel to the central axis of the roll, to influence the pressure curve in the nip N.
  • Figure 3 shows the mounting of the shoe element 3 according to another embodiment, with the same principle and possibilities of movement.
  • the loading hose is replaced with a row of cylinders driven by pressurized medium, extending in the cross- machine direction, and forming the loading means 4.
  • the cylinders are supplied with the pressurized medium, preferably hydraulic fluid, having a given pressure p and exerting, in a corresponding manner, the force F on the shoe element 3 and thereby producing the nip pressure in the nip.
  • the position of the press device, shown in Figs. 2 and 3, is such that the web W enters the nip from the side of the pivot P.
  • the loading mechanism formed by the shoe element 3 and the support plate 5 is located mirror-symmetrically, that is, the pivot P is on the exit side of the web.
  • Figure 4 shows, in a side view, the mounting of the shoe element according to a third embodiment of the invention.
  • the machine direction moving direction of the shell 1a
  • the pressures effective in the different loading means can be separately controlled.
  • the loading means 4 can also be used to implement different functions in such a way that one is used to implement the adjustment of the position (tilt) of the shoe element, or the fine adjustment of the loading.
  • the loading means 4 are expanding loading hoses placed in the cross-machine direction and containing a pressurized medium, preferably a fluid. The force is adjusted according to the above-described principle.
  • One of the loading means 4 can also be a series of hydraulic cylinders, according to the principle of Fig. 3. This alternative is illustrated in Fig. 5.
  • both loading means 4 consist of a series of hydraulic cylinders. There may also be more than two loading means in different locations in the machine direction (longitudinal direction of the nip N).
  • the shoe element 3 has a continuous supporting surface, and it has no static oil pocket or pressure pocket on its outer sur- face.
  • Lubricating oil can be supplied between the supporting surface of the shoe element 3 and the shell 1 a from the front edge of the shoe element , as illustrated by arrow L in Figs. 2 and 3.
  • the invention also covers the alternative that the lubricating oil is introduced via bores made through the shoe element, which open in a pocket formed on the supporting surface guiding the shell 1 a of the shoe element 3.
  • the front and rear edges of the shoe element are chamferred or rounded in shape, wherein the chamferred or rounded sections are not intended for sup- porting surfaces of the nip contact, but to ensure a problem-free sliding of the shell 1a on top of the supporting surface of the shoe element, and off the supporting surface.
  • the supporting surface of the shoe element 3 is a part of a continuous structure, meaning that it is not composed of separate blocks in the machine direction, which could be transferred closer to and further away from each other.
  • the supporting surface is turned as a single unit around said pivot P.
  • the rigidity of the support plate 5 bearing the shoe element 3 can be used to affect the even setting of the shoe element towards the nip.
  • the plate 5 may be solid in the cross-machine direction (direction of the shaft of the roll), or it may be composed of different parts in the cross-machine direction.
  • the flexible elastic element 1a is a roll shell, that is tubular or hose-like and fixed at its opposite ends to the ends of the roll which are journalled rotatable.
  • the roll shell is clearly wider than the shoe element supported to a static element inside the shell by means of loading devices, so that it can have a circular shape in its fixing point to the ends and can travel along a path determined by the supporting surface of the shoe element over the width of the nip line.
  • the flexible, elastic element is a belt instead of a roll shell, said belt forming an endless belt loop, wherein the belt is brought over the shoe element 3.
  • the support element E, to which the shoe element 3 is fixed and supported, is thus inside the belt loop.
  • the invention can also be applied in the press section, taking into account its special requirements.
  • the flexible hose-like shell 1a arranged rotatable, and the shoe element 3 guiding the same are used to construct the press nip in a way known from so-called extended nip structures.
  • the arrangement can be used to affect dewatering in the press nip. It is also possible to bring two press elements through the nip, which press elements are in the form of an endless felt or belt passed as a loop around the corresponding press roll.

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  • Paper (AREA)

Abstract

L'invention porte sur une presse de bande de papier comportant un élément mobile flexible (1a) formant une structure sans fin, et un contre-rouleau (2). A l'intérieur de l'élément mobile (1a) se trouve un sabot (3) maintenant l'élément mobile contre le contre-rouleau de manière à former une pince (N) dans le sens machine. Le sabot, qui repose en un premier point sur un pivot fixe (P), comporte en un deuxième point un dispositif de charge (4) qui applique le sabot (3) sur la pince en prenant appui sur ledit pivot.
PCT/FI2004/050022 2003-03-04 2004-03-02 Procede et dispositif de compression d'une bande de papier WO2004079090A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004000357T DE112004000357T5 (de) 2003-03-04 2004-03-02 Verfahren und Vorrichtung zum Pressen einer Papierbahn

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20030337 2003-03-04
FI20030337A FI114031B (fi) 2003-03-04 2003-03-04 Menetelmä paperirainan puristamiseksi ja paperirainan puristuslaite

Publications (1)

Publication Number Publication Date
WO2004079090A1 true WO2004079090A1 (fr) 2004-09-16

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ID=8565767

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2004/050022 WO2004079090A1 (fr) 2003-03-04 2004-03-02 Procede et dispositif de compression d'une bande de papier

Country Status (3)

Country Link
DE (1) DE112004000357T5 (fr)
FI (1) FI114031B (fr)
WO (1) WO2004079090A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005042834A1 (fr) * 2003-10-31 2005-05-12 Voith Paper Patent Gmbh Dispositif de pression
EP2085513A1 (fr) * 2008-01-31 2009-08-05 Voith Patent GmbH Unité de pression
WO2021032352A1 (fr) * 2019-08-20 2021-02-25 Voith Patent Gmbh Dispositif de maintien de bande
IT202000020926A1 (it) 2020-09-03 2022-03-03 A Celli Paper Spa Pressa a scarpa per carta e relativo metodo

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576682A (en) * 1983-03-23 1986-03-18 Valmet Oy Long-nip press for a paper making machine
US4713147A (en) * 1982-05-05 1987-12-15 Oy Tampella Ab Extended nip press with displaceable center of gravity for the supporting force
DE19607144A1 (de) * 1996-02-26 1997-08-28 Voith Sulzer Papiermasch Gmbh Preßvorrichtung
WO1999028551A1 (fr) * 1997-10-14 1999-06-10 Valmet Corporation Calandre munie d'une pince allongee

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713147A (en) * 1982-05-05 1987-12-15 Oy Tampella Ab Extended nip press with displaceable center of gravity for the supporting force
US4713147B1 (en) * 1982-05-05 1996-12-31 Valmet Paper Machinery Inc Extended nip press with displaceable centre of gravity for the supporting force
US4713147B2 (en) * 1982-05-05 1997-11-04 Valmet Paper Machinery Inc Extended nip press with displaceable center of gravity for the supporting force
US4576682A (en) * 1983-03-23 1986-03-18 Valmet Oy Long-nip press for a paper making machine
DE19607144A1 (de) * 1996-02-26 1997-08-28 Voith Sulzer Papiermasch Gmbh Preßvorrichtung
WO1999028551A1 (fr) * 1997-10-14 1999-06-10 Valmet Corporation Calandre munie d'une pince allongee

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005042834A1 (fr) * 2003-10-31 2005-05-12 Voith Paper Patent Gmbh Dispositif de pression
US7722744B2 (en) 2003-10-31 2010-05-25 Voith Paper Patent Gmbh Pressing device
EP2085513A1 (fr) * 2008-01-31 2009-08-05 Voith Patent GmbH Unité de pression
WO2021032352A1 (fr) * 2019-08-20 2021-02-25 Voith Patent Gmbh Dispositif de maintien de bande
CN114222710A (zh) * 2019-08-20 2022-03-22 福伊特专利有限公司 幅面固持装置
IT202000020926A1 (it) 2020-09-03 2022-03-03 A Celli Paper Spa Pressa a scarpa per carta e relativo metodo
WO2022048877A1 (fr) 2020-09-03 2022-03-10 A.Celli Paper S.P.A. Presse à sabot pour papier et procédé associé
CN116324086A (zh) * 2020-09-03 2023-06-23 亚赛利纸业设备股份公司 用于纸的靴式按压机和相关方法

Also Published As

Publication number Publication date
FI20030337A0 (fi) 2003-03-04
FI114031B (fi) 2004-07-30
DE112004000357T5 (de) 2006-01-19

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