EP1103654A2 - Verbesserungen bei Walzenbezügen - Google Patents

Verbesserungen bei Walzenbezügen Download PDF

Info

Publication number
EP1103654A2
EP1103654A2 EP00309226A EP00309226A EP1103654A2 EP 1103654 A2 EP1103654 A2 EP 1103654A2 EP 00309226 A EP00309226 A EP 00309226A EP 00309226 A EP00309226 A EP 00309226A EP 1103654 A2 EP1103654 A2 EP 1103654A2
Authority
EP
European Patent Office
Prior art keywords
roll
roll cover
bores
blind
cover
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
EP00309226A
Other languages
English (en)
French (fr)
Other versions
EP1103654A3 (de
EP1103654B1 (de
Inventor
Walter Reichel
Michael Weinzettl
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 Fabrics Blackburn Ltd
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 Fabrics Blackburn Ltd filed Critical Voith Fabrics Blackburn Ltd
Publication of EP1103654A2 publication Critical patent/EP1103654A2/de
Publication of EP1103654A3 publication Critical patent/EP1103654A3/de
Application granted granted Critical
Publication of EP1103654B1 publication Critical patent/EP1103654B1/de
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
    • D21F3/08—Pressure rolls
    • D21F3/083—Pressure rolls perforated
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

Definitions

  • the present invention relates to improvements in roll covers, applicable to all industrial rolls, but in particular to rolls used in the press-section or forming section of paper, pulp and board making machines.
  • a suction roll comprising a drilled shell and a suction box which is connected to a vacuum system and which pulls water through the drilled shell hence providing an easier escape route for the water pressed out of the paper.
  • most of the expressed water must still travel laterally to reach a drilled hole.
  • there is a limit to the pressure that can be applied by a hollow perforated shell therefore there is a reduced amount of water expressed in comparison to a plain roll.
  • suction rolls are also prone to stress fatigue and can cause shadow marking on the paper.
  • a grooved roll is usually solid and a higher pressure can be applied at the nip in comparison to a suction roll, therefore more water can be expressed.
  • the roll covers must be very hard to maintain groove integrity, and this can lead to damage of the paper.
  • the roll In a blind drilled roll, the roll is drilled with small closely spaced holes. These holes self clear/empty by the action of the centrifugal force. Because of the greater void volume in comparison to a grooved roll, there is a lower risk of the holes closing, hence the blind-drilled hole can be a softer roll than that of a grooved-roll and therefore create less damage to the paper.
  • the blind-drilled holes Due to the nip pressure, air and water are forced into the blind-drilled hole and in order to prevent a stress fracture line from developing in the rolls, the blind-drilled holes do not have a constant depth but have a variety of different depths. This has the drawback that varying back pressures can occur resulting in shadow marking of the sheet and a working of the press-felt which reduces its longevity, especially in the presence of abrasive fillings such as calcium carbonate.
  • suction holes are through bores extending all the way through the cover and mating with respective shell perforations. It is known to provide each through-bore with a diameter of 3mm which is equal to the diameter of the shell perforation.
  • the blind-drilled holes are bored into the land area between the suction holes and have a diameter of 2.2 mm. The grooves are cut into the surface in order to further boost the open area. The smaller diameter of the blind-drilled holes in comparison to that of the suction holes has prevailed because of the danger of causing the remaining land areas to be lacking in substance.
  • a roll cover for a roll comprising an outwardly presented work-contacting surface which has an even distribution of bores of equal cross-sectional area.
  • the bores comprise blind holes and a continuous circumferential groove extends helically in and about the roll cover surface and cuts through each of the blind bores.
  • the blind-drilled holes serve as temporary pressure relief vessels at the mid point of the nip when water is being expressed and the grooves provide additional open area for the water to thereby further improve the pressure distribution and thereby more readily compensate for bores of different depths with a consequent reduction in the incidence of shadow marking. Allowing the provision of different depths of grooves improves the integrity of the structure of the cover because of the further consequential reduction in hydraulic pressure leading to a further reduction in open area and increase in the surface integrity
  • a roll cover for a roll comprising an outwardly presented work contacting surface in which is provided a plurality of through bores and a plurality of blind-drilled holes, the cross-sectional area of each through bore being substantially the same as that of each blind-drilled hole.
  • the equal surface area of the through-bores in comparison to the blind-bores improves pressure distribution as described with subsequent improvement of surface integrity.
  • a continuous circumferential groove is provided in said work surface. This provides an additional path for the expressed water.
  • said groove connects the blind-bores and/or through bores.
  • the groove provides an additional channel for expressed water and thereby helps equalize pressure between the different depth of bores allowing the blind-bores to have a variety of depths and thereby reduce the occurrence of stress fractures.
  • the grooves did not cut through, or pass by a substantially number of the different bores.
  • the groove extends helically about the work surface.
  • the groove can provide a more constant or continuous pressure relief channel and connect a larger number of bores.
  • the groove has a semi-circular base. This has the advantage that it reduces frictional resistance to water flow therein.
  • each through bore is surrounded by an even distribution of blind-drilled holes and more preferably each through bore is not immediately adjacent another through bore.
  • the roll cover is provided on a homogeneous hollow shell.
  • the roll cover is provided on a perforated hollow shell. This allows drainage to the interior of the shell.
  • the through bores in the cover are aligned with a respective shell perforation to provide a suction hole in the roll.
  • each shell perforations is greater than the cross-sectional area of each through bore.
  • This allows the through bore to be reduced in diameter so as to be equal in size to the traditionally smaller blind-bores. This allowing a reduction in the surface open area with the advantages described above, whilst allowing the suction pressure to be maintained via the larger shell perforation which is enhanced by the reduced channel through the through bore.
  • suction means is provided within the shell to draw water through the suction holes.
  • the suction means is an internal foil within the suction roll the activation of which produces a suction pressure with the suction holes. This has the advantage of being a simple means of providing a suction pressure without the expense of providing and running a vacuum box or fan.
  • the foil is fixed and is located opposite the press-nip of the roll.
  • the press-nip can activate the foil allowing the suction pressure to be created adjacent the press-nip and thereby remove water flowing laterally from the nip.
  • activation means is provided in the roll to activate the foil.
  • This can be provided on the roll, if the foil is fixed with respect to the roll, or it can be fixed with regard to the roll if the foil rotates with the roll.
  • a suction roll comprising a perforated hollow drum and a foil within the drum whose activation creates a suction pressure at the perforations.
  • the suction roll further comprises a suction roll cover provided with through bores each of which connects with a respective shell perforation to provide suction holes in the roll.
  • the cover also comprises a plurality of blind-drilled holes and/or grooves.
  • a roll comprises a solid metal drum or shell 2 clad in a polyurethane shell cover 4.
  • the thickness of the cover is 21 mm and its outermost surface is provided with an equal distribution of blind-drilled holes 6 each having a diameter of 2.4 mm.
  • the blind-drilled holes have a plurality of depths namely, 5, 6 and 6.5 mm.
  • the blind-drilled holes 6 are interconnected by a circumferential groove 8 cut through each blind-drilled hole 6 and which groove 8 extends helically about the roll cover surface.
  • the grooves have a semi-circular base to reduce frictional resistance to water flow along them.
  • the roll of the first embodiment is modified in that the solid metal shell 2 comprises a plurality of equally distributed perforations 10 each having a diameter of 3 mm.
  • the cover is modified in that several of the blind-drilled holes are replaced by an equal distribution of through bores 12 each having a diameter of 2.4 mm and connecting with a respective perforation 10 to form a suction hole 14.
  • Each suction hole 14 is separated from an adjacent suction hole 14 by the interposition of a blind-drilled hole 6, such that each suction hole 14 is completely surrounded by an even distribution of blind drilled holes 6 as best illustrated in Fig. 5.
  • the hollow interior of the suction roll is provided with a standard suction box (not illustrated) to provide a vacuum at the suction holes 14.
  • the suction roll could be provided with a source of vacuum as illustrated in Fig. 6 which shows a diagrammatic cross-section of a roller 16, which comprises a cylindrical roller sleeve 4, end caps 18 and trunnions 20, 22.
  • Trunnion 20 is solid and serves only as a rotational bearing for the roller 16.
  • Trunnion 22 however has an axial bore 24 which extends along an axial shaft 26 of the roller, and the wall of the shaft 26 is pierced by a plurality of apertures 28 which connect the interior of the bore 24 with the internal volume of the roller 16.
  • a suction device such as a pump or fan is connected to the bore 24, so as to draw air, and entrained water from the surface of the roller 16, and thus from any wet material resting thereon, through the suction holes 14 and apertures 28.
  • the suction roll of the second embodiment is modified in that instead of creating a vacuum by means of a suction box or trunnion 24, an artificial vacuum is created by means of a fixed foil 30 in the interior of the suction roll 16.
  • paper 42 supported on press felt 34 passes between suction roll 16 and top roll 32 in order to express water from the paper.
  • the press-nip 36 created between the rolls activates the foil to produce a positive pressure pulse 38 and a negative pressure pulse 40 and thereby creates a vacuum to draw water into the interior of the roll 16 via the suction holes 14.
EP00309226A 1999-10-19 2000-10-19 Walze Expired - Lifetime EP1103654B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9924646.4A GB9924646D0 (en) 1999-10-19 1999-10-19 Improvements in roll covers
GB9924646 1999-10-19

Publications (3)

Publication Number Publication Date
EP1103654A2 true EP1103654A2 (de) 2001-05-30
EP1103654A3 EP1103654A3 (de) 2002-06-19
EP1103654B1 EP1103654B1 (de) 2006-06-21

Family

ID=10862946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00309226A Expired - Lifetime EP1103654B1 (de) 1999-10-19 2000-10-19 Walze

Country Status (4)

Country Link
EP (1) EP1103654B1 (de)
AT (1) ATE331071T1 (de)
DE (1) DE60028908T2 (de)
GB (1) GB9924646D0 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375742A1 (de) * 2002-06-21 2004-01-02 Voith Paper Patent GmbH Verfahren zur Herstellung einer Walze sowie Walze
DE10327248A1 (de) * 2003-06-17 2005-01-05 Voith Paper Patent Gmbh Walze, insbesondere Formierwalze
DE10341237A1 (de) * 2003-09-08 2005-03-24 Voith Paper Patent Gmbh Walze zur Herstellung und/oder Behandlung einer Faserstoffbahn und Verfahren zur Herstellung der Walze
EP1754822A2 (de) * 2005-08-19 2007-02-21 Voith Patent GmbH Verfahren zum Betreiben einer Pressenanordnung
WO2010097127A1 (de) * 2009-02-25 2010-09-02 Voith Patent Gmbh Walze
WO2011027031A1 (en) 2009-09-03 2011-03-10 Metso Paper, Inc. Roll shell and roll
DE102012200461A1 (de) 2012-01-13 2013-07-18 Voith Patent Gmbh Walzenbezug
EP2462279B1 (de) 2009-08-04 2016-08-31 Voith Patent GmbH Kombination eines pressfilzes mit einem presswalzenbezug und/oder einem saugwalzenbezug für eine papiermaschine
CN108660847A (zh) * 2018-05-15 2018-10-16 浙江永鑫特种纸有限公司 皱纹纸造纸机及造纸方法
CN108699771A (zh) * 2016-04-26 2018-10-23 斯托·伍德沃德许可有限责任公司 具有改善基面距离的通孔和盲钻孔图案的真空辊

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037527A2 (de) 2011-09-16 2013-03-21 Voith Patent Gmbh Kombination aus einem walzenbezug oder schuhpressenmantel mit einer papiermaschinenbespannung und verwendung einer derartigen kombination
DE102011086961A1 (de) 2011-11-23 2013-05-23 Voith Patent Gmbh Kombination aus einem Walzenbezug oder Schuhpressenmantel mit einer Papiermaschinenbespannung und Verwendung einer derartigen Kombination
DE102011084980A1 (de) 2011-10-21 2013-04-25 Voith Patent Gmbh Walze
DE202014003311U1 (de) 2014-04-22 2014-05-06 Voith Patent Gmbh Walze

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880711A (en) * 1973-09-12 1975-04-29 Jr Millard F Hayes Vacuum cylinder assembly having angled, tear-shaped, sieve supporting foils
US4366025A (en) * 1981-06-04 1982-12-28 Beloit Corporation Suction press roll
EP0241389A1 (de) * 1986-04-01 1987-10-14 GERLAND STOWE WOODWARD INDUSTRIES BV Société en nom collectif dite : Presswalze, insbesondere zum Eliminieren einer Flüssigkeit aus einem Blattmaterial wie einer fortlaufenden Papierbahn und Presse mit einer solchen Walze
DE19722638A1 (de) * 1997-05-30 1998-12-03 Voith Sulzer Papiermasch Gmbh Preßmantel für eine Preßvorrichtung
WO1999032713A1 (en) * 1997-12-10 1999-07-01 Valmet Corporation Roll for a paper or board machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880711A (en) * 1973-09-12 1975-04-29 Jr Millard F Hayes Vacuum cylinder assembly having angled, tear-shaped, sieve supporting foils
US4366025A (en) * 1981-06-04 1982-12-28 Beloit Corporation Suction press roll
EP0241389A1 (de) * 1986-04-01 1987-10-14 GERLAND STOWE WOODWARD INDUSTRIES BV Société en nom collectif dite : Presswalze, insbesondere zum Eliminieren einer Flüssigkeit aus einem Blattmaterial wie einer fortlaufenden Papierbahn und Presse mit einer solchen Walze
DE19722638A1 (de) * 1997-05-30 1998-12-03 Voith Sulzer Papiermasch Gmbh Preßmantel für eine Preßvorrichtung
WO1999032713A1 (en) * 1997-12-10 1999-07-01 Valmet Corporation Roll for a paper or board machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375742A1 (de) * 2002-06-21 2004-01-02 Voith Paper Patent GmbH Verfahren zur Herstellung einer Walze sowie Walze
DE10327248A1 (de) * 2003-06-17 2005-01-05 Voith Paper Patent Gmbh Walze, insbesondere Formierwalze
DE10341237A1 (de) * 2003-09-08 2005-03-24 Voith Paper Patent Gmbh Walze zur Herstellung und/oder Behandlung einer Faserstoffbahn und Verfahren zur Herstellung der Walze
EP1754822A2 (de) * 2005-08-19 2007-02-21 Voith Patent GmbH Verfahren zum Betreiben einer Pressenanordnung
EP1754822A3 (de) * 2005-08-19 2011-11-30 Voith Patent GmbH Verfahren zum Betreiben einer Pressenanordnung
WO2010097127A1 (de) * 2009-02-25 2010-09-02 Voith Patent Gmbh Walze
EP2462279B1 (de) 2009-08-04 2016-08-31 Voith Patent GmbH Kombination eines pressfilzes mit einem presswalzenbezug und/oder einem saugwalzenbezug für eine papiermaschine
WO2011027031A1 (en) 2009-09-03 2011-03-10 Metso Paper, Inc. Roll shell and roll
DE112010003537T5 (de) 2009-09-03 2012-08-30 Metso Paper, Inc. Walzenmantel und walze
DE102012200461A1 (de) 2012-01-13 2013-07-18 Voith Patent Gmbh Walzenbezug
CN108699771A (zh) * 2016-04-26 2018-10-23 斯托·伍德沃德许可有限责任公司 具有改善基面距离的通孔和盲钻孔图案的真空辊
CN108660847A (zh) * 2018-05-15 2018-10-16 浙江永鑫特种纸有限公司 皱纹纸造纸机及造纸方法

Also Published As

Publication number Publication date
GB9924646D0 (en) 1999-12-22
ATE331071T1 (de) 2006-07-15
EP1103654A3 (de) 2002-06-19
EP1103654B1 (de) 2006-06-21
DE60028908T2 (de) 2007-02-15
DE60028908D1 (de) 2006-08-03

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