WO2006117262A1 - Presse a long interstice de pression - Google Patents

Presse a long interstice de pression Download PDF

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Publication number
WO2006117262A1
WO2006117262A1 PCT/EP2006/060726 EP2006060726W WO2006117262A1 WO 2006117262 A1 WO2006117262 A1 WO 2006117262A1 EP 2006060726 W EP2006060726 W EP 2006060726W WO 2006117262 A1 WO2006117262 A1 WO 2006117262A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
roll
nip
diameter
extended
Prior art date
Application number
PCT/EP2006/060726
Other languages
German (de)
English (en)
Inventor
Andreas Meschenmoser
Thomas Augscheller
Peter Mirsberger
Andreas SCHÜTTE
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
Publication of WO2006117262A1 publication Critical patent/WO2006117262A1/fr

Links

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
    • D21F3/0218—Shoe presses

Definitions

  • the invention relates to an extended-nip press for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, consisting of a press roll with a flexible roll shell and a pressing element with a concave pressing surface which the roll shell for Forming an extended press nip presses to a cylindrical counter roll, wherein the diameter of the press roll is less than 1 m.
  • Such presses are often used in conversions and can replace conventional presses because of the small space required.
  • the object of the invention is therefore to allow for the smallest possible space requirement of the pressing arrangement, a higher pressing pulse.
  • this object is achieved in that the diameter of the counter roll is more than 0.8 m and the ratio between the length of the pressing surface in the web running direction and the diameter of the press roll is greater than 0.15.
  • the relatively large diameter of the counter roll ensures sufficient load capacity without excessive deflection of the same.
  • the larger diameter of the counter roll has a reduced curvature of the pressing surface and thus a lower load on the flexible roll shell result. This allows the pressing surface of the pressing elements as far - 2 -
  • the load on the roll shell of the press roll as a result of the deformation in the press nip area is reduced to a tolerable level if the diameter of the press roll is smaller than the diameter of the counter roll, since the result is a lower convex curvature of the press nip in the web running direction.
  • the average pressing pressure in the press nip should be greater than 2 MPa, preferably greater than 3 MPA and in particular greater than 4 MPa.
  • the pressing surface in the web running direction has a length of more than 80 mm, preferably more than 100 mm.
  • the pressing surface in the web running direction has a length of more than 140 mm, preferably more than 160 mm.
  • the advantages of the invention are obtained, above all, in presses in which the width of the press roll is less than 7.5 m, preferably less than 6.8 m and in particular less than 5.5 m , - 3 -
  • the press roll i. their roll mantle only only at most 0.6 m, preferably at most 0.5 m and in particular at most 0.4 m wider than the counter-roll, i. whose lateral surface must be.
  • FIG. 1 shows a schematic cross section through an extended-nip press
  • Figure 2 a side view of the extended nip press
  • FIG. 3 an illustration of the pressure pressure profile in the extended nip.
  • the extended press nip for dewatering a fibrous web 1, in particular a paper web in a paper machine, is formed by a cylindrical counter-roller 5 and a press roller 4 arranged above it.
  • the roller axles are mounted on both sides in a roller frame 10.
  • the fibrous web 1 passes through the press nip here by way of example together with a respective dewatering belt 2, 3 in the form of a press felt on both sides.
  • These drainage belts 2, 3 take up a large part of the water pressed in the press nip from the fibrous web 1 and transport it out of the press nip.
  • the press roll 4 has a flexible roll shell 9 made of fiber-reinforced plastic, which is pressed by a hydraulic pressing element 6 with concave pressing surface to the counter roll 5.
  • the pressing member 6 is formed as an axially extending press shoe. - A -
  • the counter roll 5 has a diameter of 1 m.
  • the pressing surface of the pressing element 6 has in the web running direction 11 has a length L of about 160 mm, so that the ratio between this length L and the diameter of the press roll 4 is 0.2.
  • the thus-dimensioned extended-nip press is a very compact press unit and is therefore ideal for the replacement of conventional press units with a short press nip.
  • the axis of rotation 8 of the roll mantle 9 of the press roll 4 is offset by an amount a against the web running direction 11 to the press plane 7 passing through the supports of the press roll 4 and the mating roll 5.
  • the width of the press roll 4 is about 6.5 m, which has a low deflection of the backing roll 5 result.
  • the roll mantle 9 Since the ends of the flexible roll mantle 9 of the press roll 4 are supported by cylindrical side windows 12, the roll mantle 9 requires a transition region from the concave shape of the press nip to the circular shape of the side window 12 shown in FIG.
  • This transition is also referred to as guy length li, l 2 and corresponds to the length by which the roll shell 9 of the press roll 4, the lateral surface of the counter roll 5 projects axially beyond.
  • This guy length li, l 2 can be the same or different lengths.
  • the press roll 4 projects beyond the counter roll 5 on both sides by the same length li, l 2 of approximately 25 cm, so that the press roll 4 is 0.5 m longer than the counter roll 5.

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  • Paper (AREA)

Abstract

L'invention concerne une presse à long interstice de pression, cette presse servant à sécher une bande (1) de papier, de carton, de papier de soie ou d'une autre matière fibreuse dans une machine pour produire et/ou façonner une telle bande. Cette presse comprend un rouleau presseur (4) présentant une enveloppe (9) flexible et un élément de pression (6) présentant une surface de pression concave, cet élément pressant l'enveloppe (9) contre un rouleau conjugué (5) cylindrique de façon à former un interstice de pression allongé. Le diamètre du rouleau presseur (4) est inférieur à 1 m. Selon l'invention, pour qu'une impulsion de pression relativement élevée puisse être obtenue malgré un encombrement extrêmement limité, le diamètre du rouleau conjugué (5) est supérieur à 0,8 m et le rapport entre la longueur (L) de la surface de pression dans le sens d'avance (11) de la bande et le diamètre du rouleau presseur (4) est supérieur à 0,15.
PCT/EP2006/060726 2005-04-30 2006-03-15 Presse a long interstice de pression WO2006117262A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510020219 DE102005020219A1 (de) 2005-04-30 2005-04-30 Langspaltpresse
DE102005020219.5 2005-04-30

Publications (1)

Publication Number Publication Date
WO2006117262A1 true WO2006117262A1 (fr) 2006-11-09

Family

ID=36497754

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/060726 WO2006117262A1 (fr) 2005-04-30 2006-03-15 Presse a long interstice de pression

Country Status (2)

Country Link
DE (1) DE102005020219A1 (fr)
WO (1) WO2006117262A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859081A2 (fr) * 1997-02-12 1998-08-19 Voith Sulzer Papiermaschinen GmbH Appareil de pressage pour déshumidifier ou satiner une bande fibreuse
US6254728B1 (en) * 1997-01-24 2001-07-03 Loith Sulzer Papiermaschinen Gmbh Method and machine for manufacturing a fibrous pulp web
US20020179270A1 (en) * 2001-06-01 2002-12-05 Gustafson Eric J. Shoe press belt with system for detecting operational parameters
WO2004088229A1 (fr) * 2003-03-31 2004-10-14 Pmt Italia S.P.A. Presse concue pour retirer de l'eau d'une bande

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254728B1 (en) * 1997-01-24 2001-07-03 Loith Sulzer Papiermaschinen Gmbh Method and machine for manufacturing a fibrous pulp web
EP0859081A2 (fr) * 1997-02-12 1998-08-19 Voith Sulzer Papiermaschinen GmbH Appareil de pressage pour déshumidifier ou satiner une bande fibreuse
US20020179270A1 (en) * 2001-06-01 2002-12-05 Gustafson Eric J. Shoe press belt with system for detecting operational parameters
WO2004088229A1 (fr) * 2003-03-31 2004-10-14 Pmt Italia S.P.A. Presse concue pour retirer de l'eau d'une bande

Also Published As

Publication number Publication date
DE102005020219A1 (de) 2006-11-09

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