EP1088936A2 - Dispositif pour la déshydratation d'une bande - Google Patents

Dispositif pour la déshydratation d'une bande Download PDF

Info

Publication number
EP1088936A2
EP1088936A2 EP00115691A EP00115691A EP1088936A2 EP 1088936 A2 EP1088936 A2 EP 1088936A2 EP 00115691 A EP00115691 A EP 00115691A EP 00115691 A EP00115691 A EP 00115691A EP 1088936 A2 EP1088936 A2 EP 1088936A2
Authority
EP
European Patent Office
Prior art keywords
rollers
material web
roller
pressure chamber
web
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
EP00115691A
Other languages
German (de)
English (en)
Other versions
EP1088936A3 (fr
EP1088936B1 (fr
Inventor
Joachim Dr. Grabscheid
Karl Josef Böck
Ulrich Begemann
Thomas Dr. Elenz
Peter Mirsberger
Hans Dr. Dahl
Hannes Dr. Vomhoff
David Beck
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 Paper 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
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1088936A2 publication Critical patent/EP1088936A2/fr
Publication of EP1088936A3 publication Critical patent/EP1088936A3/fr
Application granted granted Critical
Publication of EP1088936B1 publication Critical patent/EP1088936B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers

Definitions

  • the invention relates to a device for dewatering a material web, especially a paper or cardboard web, by driving out Water from the material web by means of gas pressure, with at least one of at least four parallel arranged limited pressure space, in which a compressed gas can be introduced and through which the material web can be passed is.
  • the compressed gas is pressed through the material web and in this way driven the water out of the material web.
  • the adjustability of the relative arrangement the geometry or the shape of the pressure chamber are changed. This creates the opportunity to determine the length of the distance that the Material web travels within the printing area, to vary in a targeted manner.
  • the Dwell time of the material web within the printing space on each desired value can be set.
  • the drainage device according to the invention is therefore particularly versatile and can be used for a variety of materials are used. In a machine for Production of a paper or cardboard web, for example, can only be done with a drainage device according to the needs different types of paper or cardboard are taken into account, by adjusting the relative roller positions required dwell time of the web to be dewatered within the pressure chamber is set.
  • the pressure chamber remains received as such. Only the geometry or the shape of the pressure chamber is changed by adjusting the rollers.
  • two opposing rollers each automatically make an adjustment movement at least one of the other two rollers can be tracked.
  • the two rollers lying opposite one another are each biased in contact with the other two rollers, whereby the distance between the other two rollers is adjustable.
  • the two preloaded rollers have a smaller one Have diameter than the other two rollers.
  • the pretensioning of the rollers can be carried out according to a variant of the invention can be achieved in that the pretensioned rollers each by at least a pretensioner is coupled to a fixed support are.
  • the prestressing devices can be elastically deformable, for example and e.g. be designed as compression spring assemblies, each support one end on the stationary support and the other End are connected to the respective roller.
  • the bias is Rolling achieved in that the rollers via at least one biasing device are coupled together.
  • the pretensioner for example elastically deformable and e.g. designed as a tension spring arrangement strives to move the two rollers towards each other whereby the two preloaded rollers against the other two rollers be pressed.
  • the pretensioners can also be hydraulic or pneumatic cylinders.
  • the fluid or Gas pressure the contact pressure of the rollers are specified, the Fluid or gas pressure in particular depending on that in the pressure chamber prevailing pressure by means of a control and / or regulating device can be adjusted.
  • adjustable pretensioners can in particular the mechanical pressure on the material web vary in the inlet gap and in the outlet gap of the pressure chamber, whereby a pre and / or Post-compression of the material web is made possible.
  • the prestressed Rolls in permanent contact with the other two rolls held so that at least one of the two during an adjustment movement other rollers follow the prestressed rollers of the adjustment movement can and at the end of the adjustment movement one of all four rollers limited Print room with the desired geometry or shape available is.
  • the object on which the invention is based is also achieved by a method for dewatering a material web, in particular one Paper or cardboard web, by expelling water from the material web by means of gas pressure in which at least one pressure chamber Pressurized gas is introduced and the material web is guided through the pressure chamber is, the effective range for adjusting the drainage capacity the pressure chamber, in particular its effective length, in the running direction the material web is changed.
  • the effective range can be changed of the printing area the dwell time of the material web in the printing area varies and in this way the drainage capacity in the desired one Way to be set.
  • the 1 comprises two large rollers 14, 16 and two small rollers 15, 17. The latter are also called cap rolls designated.
  • the four rollers 14-17 delimit a pressure chamber 12.
  • Compressed gas for example compressed air, are introduced into the pressure chamber 12, to generate a pressure "P" in the pressure chamber 12.
  • a web of material 10 to be drained for example a paper or Cardboard web, is guided in the direction B through the pressure chamber 12.
  • a band 22 of water-absorbent Material for example made of felt, and a membrane 26 are arranged.
  • Material web 10, felt 22 and membrane 26 pass through one of the lower roller 16 and the left small roller 17 formed nip 52 into the pressure chamber 12 and leave the pressure chamber 12 one formed by the lower roller 16 and the right small roller 15 Exit gap 53.
  • the dashed line at the lower roller 16 indicates that the roller 16 or its roller shell with a surface structure e.g. is provided in the form of grooves or blind holes.
  • the lower roller 16 is fixed to a roller support 62, which is also called Chair is called, stored such that they are rotated can, however, a translational movement perpendicular to its longitudinal extent not possible.
  • the opposite of the fixed roller 16 large roller 14, however, is - as indicated by the double arrow in Fig. 1 movable relative to a roller support or frame 64, that the distance between the two large rollers 14, 16th can be changed by moving the upper roller 14.
  • the two small rollers 15, 17 are each with a pretensioner 65, 63 coupled, which is supported on a fixed support 68, 66 is.
  • the biasing devices 65, 63, the z. B. each as The small rollers are compression spring assemblies 15, 17 are biased in contact with both large rollers 14, 16.
  • the pretensioners 65, 63 can each at the end regions of the rollers 15, 17 attack.
  • the pressure chamber 12 introduced pressure gas through the gas permeable membrane 26 and pressed through the material web 10 to be dewatered, whereby the water is driven out of the material web 10 and into the felt 22 becomes.
  • the removal of the water driven out of the material web 10 takes place through the felt 22 and the surface structure of the roller 16.
  • the membrane 26 creates a mechanical pressure on the surface the material web 10, whereby the drainage effect by the Compressed gas in the pressure chamber 12 is increased.
  • the configuration of the rollers 14-17 and thus the geometry or shape of the pressure chamber 12 is due to the distance between the two large rollers 14, 16 determined.
  • Each distance between the rollers 14, 16 corresponds to one from the material web 10 between the entrance gap 52 and the exit gap 53 drainage route to be covered and one - from the Dependent on web speed - dwell time of the material web 10 within the pressure chamber 12.
  • the upper roller 14 is placed on the lower one Roller 16 moves to or away from this, with the preloaded small Rollers 15, 17 due to their essentially free mobility Storage can follow this adjustment movement.
  • the possibility according to the invention for adjusting the drainage capacity allows changes to be taken into account in an advantageous manner, which affect the drainability of the material web 10, such as e.g. Changes in mass per unit area, i.e. the basis weight, the material web 10, changes in machine speed and / or changes in substance input.
  • the bias of the small rollers 15, 17 ensures that the small rollers 15, 17 in contact with both large ones at all times Rollers 14, 16 are located by the adjustment movement of the upper Roller 14 changing in terms of geometry or shape Pressure chamber 12 bounded by the four rollers 14-17 at all times is.
  • the drainage device according to the invention shown in FIG. 2 differs from that of FIG. 1 by the way in which the bias of the small rollers 15, 17 is achieved.
  • the rollers 15, 17 are connected to one another by a prestressing device 67 connected by which the rollers 15, 17 are drawn towards each other.
  • the pretensioning device 67 can be, for example Act tension spring arrangement.
  • the pretensioner 67 pulls the rollers 15, 17 in contact with both large rollers 14, 16, so that the Rollers 15, 17 follow an adjustment movement of the upper large roller 14 can and are in contact with both large rollers at all times 14, 16 are located.
  • the material web is 10, which enters the pressure chamber 12 through an inlet gap 55 and led out of the pressure chamber 12 through an outlet gap 53 between a drainage felt 22 and a membrane 26 arranged according to the embodiment of FIG. 1.
  • the biasing devices 65, 63 of the embodiment of Fig. 1 as well the biasing means 67 of the embodiment of FIG. 2 are each formed such that the biasing force exerted on the respective roller 15, 17 is substantially independent of the roll position, i.e. at any time, the small rollers 15, 17 are each at least approximately with a path-independent constant force against the two large rollers 14, 16 pressed.
  • the material web 10 is guided once through the pressure chamber 12. According to the invention, it is in principle also possible to run two passes of the To provide material web 10 through the pressure chamber 12, d. H. the material web 10 twice in succession through the pressure chamber 12.

Landscapes

  • Paper (AREA)
EP00115691A 1999-09-30 2000-07-21 Dispositif pour la déshydratation d'une bande Expired - Lifetime EP1088936B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19946971A DE19946971A1 (de) 1999-09-30 1999-09-30 Vorrichtung zur Entwässerung einer Materialbahn
DE19946971 1999-09-30

Publications (3)

Publication Number Publication Date
EP1088936A2 true EP1088936A2 (fr) 2001-04-04
EP1088936A3 EP1088936A3 (fr) 2001-09-05
EP1088936B1 EP1088936B1 (fr) 2004-07-14

Family

ID=7923916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00115691A Expired - Lifetime EP1088936B1 (fr) 1999-09-30 2000-07-21 Dispositif pour la déshydratation d'une bande

Country Status (3)

Country Link
US (1) US6381868B1 (fr)
EP (1) EP1088936B1 (fr)
DE (2) DE19946971A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159411A1 (de) 2001-12-04 2003-06-12 Voith Paper Patent Gmbh Vorrichtung zur Entwässerung einer Faserstoffbahn
US20030153443A1 (en) * 2002-02-11 2003-08-14 Beck David A. Elastic roller for a pressing apparatus
US7494563B2 (en) 2002-10-07 2009-02-24 Georgia-Pacific Consumer Products Lp Fabric creped absorbent sheet with variable local basis weight
US8673115B2 (en) 2002-10-07 2014-03-18 Georgia-Pacific Consumer Products Lp Method of making a fabric-creped absorbent cellulosic sheet
US7662257B2 (en) * 2005-04-21 2010-02-16 Georgia-Pacific Consumer Products Llc Multi-ply paper towel with absorbent core
US8293072B2 (en) 2009-01-28 2012-10-23 Georgia-Pacific Consumer Products Lp Belt-creped, variable local basis weight absorbent sheet prepared with perforated polymeric belt
US7416637B2 (en) * 2004-07-01 2008-08-26 Georgia-Pacific Consumer Products Lp Low compaction, pneumatic dewatering process for producing absorbent sheet
US7585388B2 (en) * 2005-06-24 2009-09-08 Georgia-Pacific Consumer Products Lp Fabric-creped sheet for dispensers
US8540846B2 (en) 2009-01-28 2013-09-24 Georgia-Pacific Consumer Products Lp Belt-creped, variable local basis weight multi-ply sheet with cellulose microfiber prepared with perforated polymeric belt
CA2735867C (fr) 2008-09-16 2017-12-05 Dixie Consumer Products Llc Feuille de base d'emballage alimentaire a microfibre de cellulose regeneree

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3315370A (en) * 1964-05-06 1967-04-25 Hikosaka Hiroshi Continuous dehydrating apparatus
DE2364346C3 (de) * 1973-12-22 1978-04-06 J.M. Voith Gmbh, 7920 Heidenheim Trockeneinrichtung für Papierbahnen o.dgl
FI772143A7 (fi) * 1977-07-08 1979-01-09 Tampella Oy Ab Laongzonspress foer pappersmaskin
CA1161678A (fr) * 1981-07-06 1984-02-07 David R. Webster Presse coucheuse a ventouses
US4675079A (en) * 1982-12-14 1987-06-23 Webster David R Multi-nip suction press with a four roller closed train
DE19613339C2 (de) * 1996-04-03 1998-11-12 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zum Trocknen einer Materialbahn
DE19627890A1 (de) * 1996-07-11 1998-01-15 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Entwässern einer Papierbahn

Also Published As

Publication number Publication date
EP1088936A3 (fr) 2001-09-05
EP1088936B1 (fr) 2004-07-14
DE19946971A1 (de) 2001-04-05
DE50007051D1 (de) 2004-08-19
US6381868B1 (en) 2002-05-07

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