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US20070272384A1 - Suction or Ventilation Roll - Google Patents

Suction or Ventilation Roll Download PDF

Info

Publication number
US20070272384A1
US20070272384A1 US10/575,184 US57518404A US2007272384A1 US 20070272384 A1 US20070272384 A1 US 20070272384A1 US 57518404 A US57518404 A US 57518404A US 2007272384 A1 US2007272384 A1 US 2007272384A1
Authority
US
United States
Prior art keywords
roll
cover
shell
pressure box
roll shell
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.)
Abandoned
Application number
US10/575,184
Other languages
English (en)
Inventor
Herbert Schrefl
Harald Graf-Muller
Josef Kerschbaumer
Erwin Gutlederer
Christoph Klarer
Klaus Wulz
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUTLEDERER, ERWIN, KERSCHBAUMER, JOSEF, KLARER, CHRISTOPH, SCHREFL, HERBERT, GRAF-MULLER, HARALD, WULZ, KLAUS
Publication of US20070272384A1 publication Critical patent/US20070272384A1/en
Abandoned 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
    • D21F3/10—Suction rolls, e.g. couch rolls

Definitions

  • the invention relates to a suction or blow roll for a machine for producing and/or finishing a paper, board, tissue or another fibrous web, having a rotatable perforated roll shell and at least one pressure region which extends over only part of the roll circumference and is formed by a stationary pressure box in the interior of the roll which is open toward the roll shell, the pressure box being connected to a negative or positive pressure source and being sealed off with respect to the roll shell by at least one sealing element.
  • air leakage in the region of the sealing elements can also lead to the development of noise.
  • one object of the invention to reduce the noise emission considerably with simple means in rolls of this type.
  • the object has been achieved in that, at least on one sealing element, an at least substantially air-impermeable cover running in the circumferential direction and arranged outside the pressure box and/or the roll shell adjoins or is arranged in the vicinity of a side wall of the at least one pressure box on the outer side of the roll shell, the cover either being in contact with the roll shell or having a spacing of less than 100 mm from the latter.
  • the cover is thus either totally air-impermeable or allows air through only to a low extent.
  • the cover is either arranged on the inner side of the roll shell, where it preferably adjoins a wall of the pressure box directly or, alternatively, the cover is fitted at a short distance from the wall of the pressure box.
  • the cover is made for the latter to extend outside the perforated roll shell. In this case, it projects as far as possible into the pocket between the roll shell and the belt which carries the fibrous web with it, in order to keep pressure losses as low as possible, or provision is made for the cover to reach the contact region between the belt and the roll shell, apart from a defined distance, in particular also a variable distance according to the invention.
  • Combinations of covers located on the inside and/or outside can be produced in accordance with this invention.
  • a negative pressure forms in the opening gap between the fibrous web or a belt supporting the latter and the roll at the end of the pressure region located in the direction of rotation and, in the case of suction rolls, counteracts ventilation of the perforation after the pressure region.
  • the distance between the cover and the roll shell should be less than 20 mm, preferably less than 10 mm.
  • the distance between roll shell and cover can be substantially the same everywhere or increase or decrease away from the pressure box or even fluctuate in the longitudinal and/or transverse direction of the machine.
  • cover adjoins a sealing element running approximately transversely with respect to the web running direction.
  • the air flow in the perforation can be reduced particularly considerably if a cover adjoins the end of the pressure box located in the direction of rotation.
  • the cover should extend over a circumferential region of at least 10 mm, preferably at least over a circumferential region of at least 100 mm and in particular more than 200 mm.
  • the cover extends in the circumferential direction over the entire region located outside the pressure box.
  • the cover extends axially over only part of the perforated region of the roll shell. This applies in particular to rolls having a plurality of pressure regions arranged axially beside one another.
  • the arrangement of the cover in the region of the pressure region with the highest negative or positive pressure may be sufficient.
  • an adjusting device by means of which a cover can be varied axially over its entire width or over part of its width with respect to its distance or its angle of attack in relation to the roll shell.
  • the adjusting device can be adjusted hydraulically, pneumatically or mechanically, for example.
  • the position may be adjusted by a control device which comprises a controller.
  • a control device which comprises a controller.
  • said controller acts via a signal variable on the adjusting device, which changes the position of a cover in accordance with the signal variable.
  • the controlled variable measured by the measuring device is, for example, the pressure in the pressure box or the moisture of the fibrous web or of the fabric or of the felt by which the fibrous web is carried.
  • a cover has a straight, curved, undulating, zigzag or irregularly broken terminating edge on only one transverse or longitudinal side or a plurality of sides.
  • the cover also has openings, for example in the form of drilled holes or apertures.
  • spacers in particular in the form of rods, wedges or strips, which can in particular be adjusted by the adjusting device.
  • a cover consists either of a single material or of a plurality of materials, in particular of a metal, a plastic and/or a composite material.
  • FIG. 1 shows a cross section of a roll with a plurality of covers
  • FIG. 2 shows a cross section of a roll with a continuous cover
  • FIG. 3 shows a cross section of a roll with two covers arranged on the inside and outside after the pressure box in the direction of rotation, and
  • FIG. 4 shows a cross section of a roll with the two covers according to FIG. 3 , which can be adjusted via spacers and an adjusting device.
  • the rolls shown in FIGS. 1-4 are suction rolls having a perforated, rotatable roll shell 1 , such as are used in paper machines, in particular in the former during sheet formation, in the press section and in the drying section.
  • suction rolls are wrapped around here by an air-permeable belt 3 , that is to say for example a fabric or a felt or a belt consisting of another material, and the fibrous web 2 located on the outside, the negative pressure region 9 being located in the wrap region.
  • This negative pressure region 9 is formed by a stationary pressure box 6 in the roll interior which is open toward the roll shell 1 .
  • the interior of the pressure box 6 is connected to a negative pressure source.
  • the pressure box 6 is sealed off completely with respect to the roll shell 1 by sealing elements 5 in the form of sealing strips.
  • the negative pressure of the pressure box 6 through the holes of the perforation of the roll shell 1 effects attraction of the fibrous web 2 by suction onto the air-permeable belt 3 in the pressure region 9 .
  • the axial sealing elements 7 are adjoined by air-impermeable covers 5 running in the circumferential direction. These covers 5 have only a small spacing of less than 10 mm from the roll shell 1 , the distance increasing away from the pressure box 6 . In another design, the distance between the roll shell 1 and one of the covers 5 or both covers 5 remains constant.
  • these covers 5 reduce air leakage and, at the outlet, the ventilation of the perforation from the interior of the roll. As a result, there is a considerable reduction in the emission of noise.
  • the ventilation of the perforation in which a negative pressure prevails at the exit from the pressure region 9 , can take place substantially only by means of an air flow 8 from outside.
  • This air flow 8 is already hindered by the water mist present in the region of the suction roll.
  • a negative pressure forms in the pocket opening between the belt 3 and the suction roll, which counteracts ventilation of the perforation to a considerable extent.
  • the ventilation takes place substantially more gradually and therefore without noise.
  • the cover 5 covers approximately a region of 25° and, at the outlet, of 50°.
  • FIG. 2 a design is shown in which the cover 5 extends in the circumferential direction over the entire region located outside the pressure box 6 . This entirely prevents ventilation from the inside, in particular when the distance between the cover 5 and the roll shell 1 lies in the range of a few millimeters or the cover 5 is even in contact with the roll shell 1 .
  • the covers 5 here extend over the entire perforated region of the roll shell 1 .
  • FIG. 3 in addition to the cover 5 , there is a further cover 10 on the outside of the roll shell 1 , in the pocket formed by the latter with the belt 3 .
  • the two covers 5 , 10 can preferably be adjusted via joints 11 and 12 .
  • spacers 13 , 14 are fitted to the cover 5 and spacers 15 , 16 to the cover 10 .
  • the spacers 13 to 16 consist either of plastic or metal; they may be configured in the shape of wedges; for example, they are wearing plastic parts which can easily be replaced.
  • the spacers 13 to 16 are formed either as rods or as sealing strips, in particular from sheet metal.
  • the sealing strips can also be present in addition to the spacers 13 to 16 .
  • the spacers 15 , 16 ensure the maintenance of the desired spacing between the roll shell 1 and the cover 10 , since the latter is attracted by the roll shell 1 on account of the low component section modulus.
  • the component section modulus characterizes the intensity of the deformation under external loading. In this case, a lower deformation signifies a high section modulus and vice versa.
  • the position of the covers 5 , 10 is changed by adjusting devices 17 and 18 . These are connected to the spacers 13 , 14 and 15 , 16 via pressure lines 19 , 20 , for example, so that the spacing of the covers 5 , 10 with respect to the roll shell 1 both at the leading end and the trailing end of the covers 5 , 10 can be changed hydraulically or pneumatically by means of a fluid medium (oil, water, air) supplied via the lines 19 , 20 . Alternatively or additionally, provision is made for the angle of attack of the covers 5 , 10 to be adjusted, the joints 11 , 12 being influenced by the devices 17 , 18 via appropriate lines.
  • a fluid medium oil, water, air
  • the devices 17 , 18 influence the positions as a result of the fact that there are mechanical adjusting means, for example in the form of threaded spindles.
  • the spacings of the devices 17 , 18 can be changed by means of appropriate configurations of the devices 17 , 18 either over the entire width of the covers 5 , 10 exclusively or else at points or in specific sections of the covers 5 , 10 .
  • distance regulation in the radial and/or axial direction is thus possible.
  • the devices 17 , 18 have signal variables applied to them by measuring devices, for example, it being possible, for example, for the sound level determined outside the roll or the pressure measured in the pressure box 6 to be used as controlled variable.

Landscapes

  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Massaging Devices (AREA)
  • External Artificial Organs (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US10/575,184 2003-10-10 2004-09-17 Suction or Ventilation Roll Abandoned US20070272384A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10347177.4 2003-10-10
DE10347177A DE10347177A1 (de) 2003-10-10 2003-10-10 Saug- oder Balswalze
PCT/EP2004/052226 WO2005035868A1 (de) 2003-10-10 2004-09-17 Saug- oder blaswalze

Publications (1)

Publication Number Publication Date
US20070272384A1 true US20070272384A1 (en) 2007-11-29

Family

ID=34428295

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/575,184 Abandoned US20070272384A1 (en) 2003-10-10 2004-09-17 Suction or Ventilation Roll

Country Status (8)

Country Link
US (1) US20070272384A1 (de)
EP (1) EP1673505B1 (de)
JP (1) JP2007508464A (de)
AT (1) ATE397121T1 (de)
BR (1) BRPI0414745B1 (de)
CA (1) CA2541861A1 (de)
DE (2) DE10347177A1 (de)
WO (1) WO2005035868A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008016875U1 (de) 2008-12-19 2009-03-05 Voith Patent Gmbh Dichtleiste

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2274641A (en) * 1938-02-07 1942-03-03 Abbott Suction roll
US2772606A (en) * 1955-07-29 1956-12-04 Joseph J Kelly Combination suction roll and silencing and cleaning means
US6328194B1 (en) * 1999-05-07 2001-12-11 Voith Sulzer Papiertechnik Patent Gmbh Device for handling a material web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509436A (en) * 1938-01-17 1939-07-17 Beloit Iron Work Suction roll for paper-making machines
GB736149A (en) * 1952-06-27 1955-09-07 Bowaters Dev & Res Ltd Device for reducing noise in suction apparatus of textile fabric drying machines, paper-making machines or the like
DE1149602B (de) * 1955-05-09 1963-05-30 Nat Res Council Schalldaempfer fuer Papiermaschinensaugwalzen
US2882969A (en) * 1956-09-26 1959-04-21 Int Paper Co Silencing means for paper machine suction rolls
DE19751283B4 (de) * 1997-11-19 2007-12-20 Voith Patent Gmbh Dichtungseinrichtung
DE20104572U1 (de) * 2001-03-16 2001-06-28 Voith Paper Patent GmbH, 89522 Heidenheim Saugwalzenanordnung
DE10214134A1 (de) * 2002-03-28 2003-10-09 Voith Paper Patent Gmbh Dichtungseinrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2274641A (en) * 1938-02-07 1942-03-03 Abbott Suction roll
US2772606A (en) * 1955-07-29 1956-12-04 Joseph J Kelly Combination suction roll and silencing and cleaning means
US6328194B1 (en) * 1999-05-07 2001-12-11 Voith Sulzer Papiertechnik Patent Gmbh Device for handling a material web

Also Published As

Publication number Publication date
WO2005035868A1 (de) 2005-04-21
CA2541861A1 (en) 2005-04-21
ATE397121T1 (de) 2008-06-15
EP1673505A1 (de) 2006-06-28
DE502004007303D1 (de) 2008-07-10
BRPI0414745A (pt) 2006-11-21
BRPI0414745B1 (pt) 2015-12-08
EP1673505B1 (de) 2008-05-28
JP2007508464A (ja) 2007-04-05
DE10347177A1 (de) 2005-05-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VOITH PATENT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHREFL, HERBERT;GRAF-MULLER, HARALD;KERSCHBAUMER, JOSEF;AND OTHERS;REEL/FRAME:018939/0250;SIGNING DATES FROM 20070206 TO 20070219

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION