EP0258759A1 - Presse humide pour la déshydratation de bandes de fibres - Google Patents

Presse humide pour la déshydratation de bandes de fibres Download PDF

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Publication number
EP0258759A1
EP0258759A1 EP87112153A EP87112153A EP0258759A1 EP 0258759 A1 EP0258759 A1 EP 0258759A1 EP 87112153 A EP87112153 A EP 87112153A EP 87112153 A EP87112153 A EP 87112153A EP 0258759 A1 EP0258759 A1 EP 0258759A1
Authority
EP
European Patent Office
Prior art keywords
press
belt
band
roller
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.)
Withdrawn
Application number
EP87112153A
Other languages
German (de)
English (en)
Inventor
Arnold F. Kienzl
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.)
Gummiwerke Becker AG
Original Assignee
Gummiwerke Becker AG
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 Gummiwerke Becker AG filed Critical Gummiwerke Becker AG
Publication of EP0258759A1 publication Critical patent/EP0258759A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a wet press for dewatering fibrous webs, for. B. a paper web, with a rotatable first press roller and an opposing counterpressure device in the form of a press shoe or a rotatable second press roll, the first press roll and the counterpressure device forming a press nip between them through which the fibrous web can be passed between sieves and / or felts.
  • Press rollers which consist of a steel core, which are covered with a softer, usually elastic rubber or plastic covering.
  • the coverings can be made by pouring on, rolling on or spraying on, the roller cores having to be carefully prepared in order to ensure a good adhesive bond between the roller core and the covering.
  • roller core For this purpose it is necessary in practice to clean and degrease the roller core, to subject it to a sandblasting treatment and to coat it with an adhesive which then establishes the connection between the roller core and the covering, which is applied under the action of heat.
  • press rolls of the type mentioned or their roll coverings have only a limited service life due to abrasion, so that the roll cover must be renewed in certain periods. On the one hand, this causes production downtimes due to the necessary change of Press rolls.
  • transport costs since the rolls cannot usually be re-occupied on the spot, but have to be transported to the coating plant. Because of the high weights and large dimensions of the rollers, these transport costs are considerable.
  • the object of the invention is therefore to provide a wet press of the type mentioned at the outset which improves the maintenance of the wet press while reducing transport and investment costs.
  • the solution according to the invention consists in designing a wet press of the type mentioned above in such a way that at least the first press roll consists of a cylindrical roll core made of metal and an endless belt which rotates around the roll core and is made of an elastomeric material, the diameter of the belt being greater than is that of the roll core.
  • the desired goal is achieved in a satisfactory manner, because the belt occupancy of the press roll can be replaced on the spot without the roll core needing to be removed. It is only necessary to pull off the old, processed covering axially and to install the new covering on the roller core.
  • the belt and / or the roll core has the crowning of the press roll.
  • the crowning can advantageously be ground on the belt alone, which can be processed much faster than the roll core, which will usually be made of steel.
  • the belt has a rough or profiled surface on its inside to support the rotating entrainment by the roller core.
  • the inside of the band can have a net-like structure or can be ribbed, serrated or nubbed.
  • the outside of the band made of elastomeric material is smooth in the usual way.
  • the endless belt is formed in one piece and consists of an optionally spliced or sewn or a seamless tube.
  • the workpiece can thus be processed as a flat structure and then formed into a tube.
  • the band can be produced as an endless tube on a mandrel.
  • the band expediently has a reinforcement which is incorporated into the elastomeric material, in particular rubber, rubber, nitriles and / or polyurethane.
  • the reinforcement can consist of a base fabric and an integrated reinforcement fabric of the band.
  • the reinforcement of the belt has a single-layer or multi-layer fabric made of monofilament filaments or threads with a wound core and consists of one or more of the materials polyamide, polyester, Kevlar and metal.
  • the belt of the wet press according to the invention has a high dimensional stability and is resistant to tension, abrasion and heat.
  • the tape expediently has an elastomeric coating or rubber coating with a layer thickness of 3 to 30 mm, preferably 10 to 20 mm.
  • the layer thickness is selected depending on the respective purpose.
  • the hardness of the elastomeric material of the band varies in the layer thickness of the covering from the inside to the outside, in order to meet the respective requirements in practice.
  • the hardness of the elastomeric material is initially constant over the layer thickness of the band from the inside to the outside and then gradually drops to a predetermined lower limit.
  • the hardness of the elastomeric material over the layer thickness of the strip is designed such that it first increases from the inside outwards from a predetermined lower limit value to a maximum and then decreases again, possibly up to the lower limit value.
  • the elastomeric material can be applied to the reinforcement of the band in various ways, for example by vulcanization or by casting, optionally in several casting passes.
  • the casting can, for. B. take place in several runs or with several casting heads, the mandrel production being particularly suitable.
  • layers of different hardness can be applied in succession or one above the other, so that the desired hardness profile of the covering results overall from the inside out.
  • the interior of the belt and / or the roll core is flushed with a liquid or gaseous coolant.
  • Water is a suitable liquid coolant, which flows through the interior of the roll core and thereby releases its cooling effect on the belt running over it.
  • a gaseous coolant it is also possible to apply a gaseous coolant to the interior of the belt by z. B. Blows cooling air from the inside against the belt.
  • the roll core has radial projections or guides as a holding device at its front ends. It can be z. B. are ring flanges that prevent the tape from running off the roll core.
  • the roller core has a greater axial length than the belt. If the axial length of the roller core is substantially greater than that of the belt, a spreader device can be dispensed with in most cases.
  • the roll core of the wet press according to the invention has a diameter of the order of 200 to 2000 mm, the diameter of the belt being 1.1 to 2 times the value of the roll core.
  • a guide or tensioning device is provided for the strip.
  • This can be, for example, a number of tensioning rollers which are attached in the interior of the belt.
  • the second press roll which forms the counterpressure device for the first press roll, also expediently has the same structure as the first press roll, with at least one of the press rolls being driven, but both press rolls can also be driven.
  • FIG. 1 The essential area of the wet press according to the invention is shown schematically in FIG. 1.
  • a first press roll 10 can be seen with an opposing counterpressure device which, in the embodiment shown, is designed as a second press roll 20.
  • the counterpressure device can also be designed in the form of a press shoe of a conventional type.
  • the first press roll 10 consists of a first roll core 12 made of metal, in most cases in practice from a steel cylinder, around which an endless belt 14 made of an elastomeric material is loosely wrapped.
  • the diameter of the belt 14 is larger than that of the roller core 12 in the manner shown.
  • the second press roll 20 also consists of a second roll core 22, around which a second endless belt 24 is loosely wrapped and, like the first belt 14, is made of an elastomeric material.
  • the two press rolls 10 and 20 form between them a press nip 38, through which a first felt 30 and a second felt 34 pass and between them carry a fibrous web 32 to be dewatered, for example a paper web, which is pressed out in the press nip 38, the moisture then from the felt 30 or 34 is recorded.
  • the guide device for the felts 30 and 34 is indicated schematically in FIG. 1 with a deflection roller 36. This guide device is designed in a conventional manner and is therefore not described in detail.
  • the reference numerals 26, 27 and 28 denote tensioning elements which are arranged in the interior of the band 24 and form a tensioning device for the band 24.
  • a tensioning device is expediently provided if the diameter of the band 24 is substantially larger than that of the associated roller core 22.
  • a corresponding tensioning device is also provided for the belt 14 if it has a correspondingly larger diameter than its associated roller core 12.
  • Corresponding clamping elements are not shown in FIG. 1 to simplify the drawing.
  • roller cores 12 and 22 and the belts 14 and 24 are shown with the same diameters in the arrangement according to FIG. 1, the invention is by no means restricted to such an embodiment. Rather, the diameters of the roll cores and the respective strips can also be designed differently.
  • the roller cores 12 and 14 will expediently have a diameter of the order of 200 to 2000 mm, while the diameter of the belt 14 or 24 has a value which is approximately 1.1 to 2 times the value of the roller core 12 or 14 matters.
  • the roller core 12 can have radial projections 16, 18 or ring flanges at its front ends, which act as guides and form a holding device for the associated belt 14. If the roller core 12 has a substantially greater axial length than the associated belt 14, such end guides can also be omitted.
  • the respective belt 14 or 24 is carried along by its associated roller core 12 or 22 by frictional engagement in the area of the press nip 38, the two roller cores 12 and 22 being rotatably supported about axes not shown.
  • the value of the press nip 38 can be set depending on the particular circumstances by changing the distance between the press rolls 10 and 20 or the roll cores 12 and 22.
  • the belt 14 or 24 is smooth on the outside and has a rough or profiled surface on the inside to support the rotating entrainment by the roller core 12 or 22.
  • the inside can have a net-like structure or can be ribbed, toothed or nubbed be trained to support this friction. If the heat generated by frictional engagement in the area of the press nip 38 is not sufficiently absorbed by the external environment a cooling device can be provided for the respective press rolls 10 and 20.
  • the interior of the belt 14 or 24 and / or the roller core 12 or 22 can be acted upon with a coolant.
  • the roller core can be flushed with water, for example, in order to dissipate the heat from the roller core and the belt lying thereon.
  • the band 14 or 24 can be suitably acted upon from the inside with a gaseous coolant, for example with cooling air.
  • band 14 is referred to below, the band 24 being designed in a corresponding manner.
  • the belt 14 on the roll core 12 is provided as an endless belt which is formed in one piece and forms a cylindrical tube which is either spliced or stitched or is seamless.
  • the band 14 expediently has a reinforcement which is incorporated into the elastomeric material, which is in particular rubber, rubber, nitriles and / or polyurethane.
  • the reinforcement expediently consists of a base fabric and an incorporated reinforcement fabric.
  • the fabric can be single-layer or multi-layer and can either consist of monofilament filaments or threads with a braided core.
  • Polyamide, polyester, Kevlar and / or metal threads are particularly suitable as materials. It is important in this context that the belt 14 has a high dimensional stability and is resistant to tensile, abrasion and heat, which inevitably occur under normal operating conditions.
  • the band 14 has an elastomeric coating or rubber coating with a layer thickness of the order of magnitude from 3 to 30 mm. In most practical cases, a layer thickness of 10 to 20 mm is suitable.
  • the elastomeric material can be applied to the reinforcement of the band 14 either by vulcanization or by casting, optionally in several casting passes. In this respect, the band can advantageously be manufactured on a mandrel.
  • the casting process can be carried out in several passes or with several casting heads arranged one behind the other in order to achieve the desired layer thickness of the covering on the belt 14.
  • the casting heads By suitably acting on the casting heads, it can be achieved that the hardness of the elastomeric material of the band 14 differs from the inside to the outside over the layer thickness of the covering.
  • the hardness in the layer thickness of the covering increases from a predetermined lower limit value A until a maximum value C of hardness is reached at approximately half the layer thickness. The hardness then decreases again to a lower value B towards the outside.
  • FIG. 4 Another exemplary embodiment is shown schematically in FIG. 4. It can be seen that the hardness in the coating of the belt 14 remains at a constant value D up to about half the layer thickness and then gradually drops outwards to a lower value E. Of course, the hardness can also be preselected in a different way for the coating of the strip 14 by charging the casting heads of the coating device accordingly.
  • both the belt 14 and the roll core 12 it is advantageously possible for both the belt 14 and the roll core 12 to have the crowning of the press roll 10.
  • the band 14 alone or predominantly has this crowning since it can be easily ground into the band 14.

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  • Paper (AREA)
EP87112153A 1986-09-01 1987-08-21 Presse humide pour la déshydratation de bandes de fibres Withdrawn EP0258759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3629736 1986-09-01
DE19863629736 DE3629736A1 (de) 1986-09-01 1986-09-01 Nasspresse zum entwaessern von faserstoffbahnen

Publications (1)

Publication Number Publication Date
EP0258759A1 true EP0258759A1 (fr) 1988-03-09

Family

ID=6308675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112153A Withdrawn EP0258759A1 (fr) 1986-09-01 1987-08-21 Presse humide pour la déshydratation de bandes de fibres

Country Status (3)

Country Link
EP (1) EP0258759A1 (fr)
DE (1) DE3629736A1 (fr)
FI (1) FI873770A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1251203A1 (fr) * 2001-04-18 2002-10-23 Stowe Woodward Aktiengesellschaft Bande pour presse à patin
DE102004011665A1 (de) * 2004-03-10 2005-10-06 Stowe Woodward Ag Integraler Schuhpressenbelt
US7005042B2 (en) 2001-09-17 2006-02-28 Stowe Woodward Ag Nip press belt

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9200438U1 (de) * 1992-01-16 1993-05-13 Eduard Küsters Maschinenfabrik GmbH & Co KG, 4150 Krefeld Walze
DE19905515A1 (de) * 1999-02-10 2000-08-17 Voith Sulzer Papiertech Patent Pressenanordnung
CN109274024B (zh) * 2017-07-18 2020-11-24 平高集团有限公司 一种筒体内部导体安装用小车

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306814A (en) * 1964-03-27 1967-02-28 Raybestos Manhattan Inc Paper making machine wringer apparatus
WO1982002567A1 (fr) * 1981-01-27 1982-08-05 Hauser Ludwig Rouleau de pressage pour materiau en bande
WO1984002726A1 (fr) * 1983-01-04 1984-07-19 Ahlstroem Oy Presse
DE3318984A1 (de) * 1983-05-25 1984-11-29 Fa. F. Oberdorfer, 7920 Heidenheim Herstellungsverfahren fuer zugfeste, undurchlaessige, biegsame baender insbesondere fuer pressen zum entwaessern von faserstoffbahnen
DE3600246A1 (de) * 1985-01-08 1986-07-10 Valmet Oy, Helsinki Verfahren und vorrichtung sowie riemenkomponente zum ausgleichen des pressdruckes eines papiermaschinenpressenspaltes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3386148A (en) * 1965-10-15 1968-06-04 Mount Hope Machine Company Inc Fluid bearing table roll
GB1066423A (en) * 1965-04-28 1967-04-26 Mount Hope Machinery Ltd Fluid bearing table roll
CH591025A5 (fr) * 1975-05-15 1977-08-31 Continental Gummi Werke Ag
DE2709915A1 (de) * 1977-03-08 1978-09-14 Finckh Maschf Presse zum entwaessern von faserstoffsuspensionen
GB1603547A (en) * 1978-05-18 1981-11-25 Beloit Corp Blanket for the production of extensible paper
DE3126492C2 (de) * 1981-06-30 1983-10-20 Escher Wyss AG, Zürich Preßwalze

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306814A (en) * 1964-03-27 1967-02-28 Raybestos Manhattan Inc Paper making machine wringer apparatus
WO1982002567A1 (fr) * 1981-01-27 1982-08-05 Hauser Ludwig Rouleau de pressage pour materiau en bande
WO1984002726A1 (fr) * 1983-01-04 1984-07-19 Ahlstroem Oy Presse
DE3318984A1 (de) * 1983-05-25 1984-11-29 Fa. F. Oberdorfer, 7920 Heidenheim Herstellungsverfahren fuer zugfeste, undurchlaessige, biegsame baender insbesondere fuer pressen zum entwaessern von faserstoffbahnen
DE3600246A1 (de) * 1985-01-08 1986-07-10 Valmet Oy, Helsinki Verfahren und vorrichtung sowie riemenkomponente zum ausgleichen des pressdruckes eines papiermaschinenpressenspaltes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1251203A1 (fr) * 2001-04-18 2002-10-23 Stowe Woodward Aktiengesellschaft Bande pour presse à patin
WO2002084020A1 (fr) * 2001-04-18 2002-10-24 Stowe Woodward Ag Bande de presse a patin
US7014734B2 (en) 2001-04-18 2006-03-21 Stowe Woodward Ag Shoe press belt
US7005042B2 (en) 2001-09-17 2006-02-28 Stowe Woodward Ag Nip press belt
DE102004011665A1 (de) * 2004-03-10 2005-10-06 Stowe Woodward Ag Integraler Schuhpressenbelt

Also Published As

Publication number Publication date
FI873770A (fi) 1988-03-02
FI873770A0 (fi) 1987-08-31
DE3629736A1 (de) 1988-03-03

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Inventor name: KIENZL, ARNOLD F.