WO1994003675A1 - Agencement avec un cylindre aspirant - Google Patents

Agencement avec un cylindre aspirant Download PDF

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Publication number
WO1994003675A1
WO1994003675A1 PCT/EP1992/001743 EP9201743W WO9403675A1 WO 1994003675 A1 WO1994003675 A1 WO 1994003675A1 EP 9201743 W EP9201743 W EP 9201743W WO 9403675 A1 WO9403675 A1 WO 9403675A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement according
suction
arrangement
roller
exhaust air
Prior art date
Application number
PCT/EP1992/001743
Other languages
German (de)
English (en)
Inventor
Wolfgang Mayer
Karl GRÖNER
Original Assignee
J.M. Voith 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 J.M. Voith Gmbh filed Critical J.M. Voith Gmbh
Priority to PCT/EP1992/001743 priority Critical patent/WO1994003675A1/fr
Publication of WO1994003675A1 publication Critical patent/WO1994003675A1/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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems

Definitions

  • the invention relates to an arrangement with a suction roll, which is perforated inside
  • Roll jacket has a stationary air guide body, which in cooperation with the rotation of the perforated roll jacket automatically generates a vacuum and an overpressure zone, in detail according to the preamble of claim 1.
  • Such an arrangement is known from DE-GM 91 06 451 (file P 4585 ).
  • This known arrangement thus differs from other known arrangements in which the vacuum inside the suction roll is generated by means of a separate suction device connected via a suction line.
  • the present invention is concerned with the problem of making an arrangement with an automatically generating vacuum roll as simple as possible, so that it can be produced inexpensively.
  • the arrangement should work as reliably as possible, so that it is applicable in a single-tier dryer section of a paper making machine. It is important to transport the paper web to be dried at extremely high working speeds (of the order of 1000 to 2000 m / min) by means of a porous support belt from the contact zone with a heatable drying cylinder, for example to a subsequent drying cylinder. This must be done with high reliability, i.e. without the risk of the paper web tearing off.
  • the above-mentioned problem is essentially solved in that the curved guide wall (in cooperation with the rotation of the perforated roll shell) which produces the depression is in the extends substantially along the entire inner circumference of the roll shell.
  • the curved guide wall in cooperation with the rotation of the perforated roll shell
  • which produces the depression is in the extends substantially along the entire inner circumference of the roll shell.
  • only a single sealing arrangement which extends over the entire length of the intermediate space, is provided in the annular intermediate space present between the roll shell and the air guide body.
  • This is preferably a simple sealing strip fastened to the stationary air guide body, which forms a sealing gap with the inner surface of the rotatable roller shell.
  • the sealing arrangement has an outlet side and an inlet side.
  • the radial distance of the curved guide wall from the inner surface of the roll shell is relatively small. From here, this radial distance (or in other words the "radial thickness of the gap") along the inner circumference of the
  • the curvature of the guide wall is dependent on
  • the inner diameter of the roll shell is dimensioned such that the width of the pressure zone, measured in the circumferential direction, becomes as small as possible and that the suction zone therefore extends in the circumferential direction over as large a part of the inner circumference of the roll shell as possible. Thanks to the invention, it is entirely possible that the suction zone, starting from the outlet side of the sealing arrangement, extends over 2/3 to 3/4 (or even more) of the inner circumference of the roller shell.
  • Fig. 1 shows an arrangement with a suction roller, in a schematic cross section.
  • FIG. 2 is a partial longitudinal section along the line II-II of FIG. 1.
  • FIG. 3 shows an arrangement in cross section that differs from FIG. 1.
  • Fig. 4 shows schematically a further arrangement with a suction roller.
  • Fig. 1 shows a section of a single-tier dryer section of a paper making machine, with a first drying cylinder 11, a second drying cylinder 12 and a suction roller designated overall by 13.
  • On endless porous support belt 10 (preferably a so-called dryer fabric) runs from the first drying cylinder 11 via the suction roll 13 to the second drying cylinder 12.
  • a paper web to be dried which is omitted in the drawing, runs together with the support belt 10 through the entire arrangement; it is located in the area of the suction roll 13 on the outside of the support belt 10, that is to say it is pressed against the drying cylinders 11 and 12 by the support belt.
  • the suction roller 13 has a rotatable and perforated roller jacket 14 and a stationary air guide body 15 extending through the interior of the roller jacket.
  • the air guide body has a convexly curved guide wall 15 'which extends in the circumferential direction at least approximately along the whole Inner circumference of the roll shell extends.
  • the radius of curvature K1, K2 of the guide wall 15 ' is smaller than the radius R of the inner surface area of the roll shell 14.
  • a seal arrangement 16 is provided on the air guide body 15, preferably in the form of a single sealing strip, which extends over the entire length of the suction roll and forms a sealing gap with the inner lateral surface of the rotating roll casing 14. With regard to the direction of rotation of the suction roll 13, the sealing arrangement 16 has an outlet side 16a and an inlet side 16b.
  • the radius of curvature Kl, K2 of the convexly curved guide wall 15 • is along the circumference of the
  • Air guide body 15 starting from the outlet side 16a of the seal 16, gradually or continuously smaller, until the curved guide wall 15 reaches the inlet side 16b of the seal 16.
  • the air guide body 15 is composed of two semi-cylindrical parts, the the first part has the radius of curvature Kl, which (as already mentioned) is smaller than the radius R of the inner lateral surface of the roll shell 14, and the second part has the even smaller radius of curvature K2. This is between the roll shell and the
  • Air guide body has an intermediate space 17, the radial "thickness" d of which, starting from the outlet side 16a of the seal 16, increases substantially along the entire circumference of the air guide body 15.
  • the radial thickness is greatest on the inlet side 16b; there it is generally about 20 to 50 mm or in exceptional cases less than 20 mm.
  • the seal 16 is arranged at a small distance from the point A with respect to the circumferential direction, where the support belt 10 runs onto the roller jacket 14.
  • the point where the support belt 10 runs again from the suction roller 13 is designated by B.
  • the support belt 10 wraps around the suction roll 14 in a wrapping zone running from A to B, the angle U of which is generally greater than 180 °.
  • the air guide body 15 Due to the described shape of the air guide body 15, this forms - in cooperation with the rotation of the perforated roller jacket 14 - a suction zone in the intermediate space 17, which begins at the seal 16 (i.e. before the contact point A) and ends only after the contact point B, namely approximately at point C.
  • This ensures that negative pressure is generated not only in the area of the wrap zone U, but also in the inlet and outlet branches in Za and Zb.
  • a relatively high pressure is established in the intermediate space 17, so that the air sucked inward in the suction zone is removed to the outside.
  • the pressure which arises in the pressure zone is approximately equal to that Atmospheric pressure or slightly less than or greater than this.
  • a stationary exhaust air collecting box 18 which is open towards the roll jacket 14.
  • This has two longitudinal sealing strips 19 and 20 which form sealing gaps with the outside of the roll shell 14 and thus seal the interior of the exhaust air collecting box 18 from the outside.
  • One longitudinal sealing strip 19 is arranged in the vicinity of the seal 16 already mentioned, the other longitudinal sealing strip 20, however, in the vicinity of point C, in the area of which the suction zone merges into the pressure zone.
  • the drain collecting box 18 has an exhaust air opening 22 on an end wall 21 (or on both end walls), to which a suction line 23 can be connected.
  • the exhaust air collecting box 18 has in the area of the outlet point of the support band 10 from the first
  • Drying cylinder 11 has a suction chamber 24 which is delimited by sealing strips 24a and 24b and is delimited from the remaining part by an intermediate wall 25.
  • Suction line 26 and suction fan 27 are only indicated schematically. Both side walls 28 and 29 of the exhaust air collecting box 18 diverge - with respect to the tape running direction - from the path of the support belt 10, so that negative pressure is also generated along the straight paths of the support belt 10 in order to keep the paper web in safe contact with the support belt 10.
  • a machine stand 31 stands on a foundation 30.
  • a longitudinal support 32 rests thereon and a bearing 33 for the drying cylinder 11 rests thereon.
  • a bearing housing also rests on the foundation 30 34 for the suction roll 13.
  • On the perforated roll cover 14 a cover 35 is fastened with a hollow journal 36 which is rotatably mounted in the bearing housing 34.
  • the stationary air guide body 15 has an end wall 37 in the region of the roller end and also a hollow bearing journal 38 therein, which extends through the bearing journal 36 and beyond it to the outside. There, the bearing journal 38 and thus the entire stationary air guide body 15 are fastened to the bearing housing 34 by means of a bell 39.
  • the exhaust air collecting box 18 is fastened to the side member 32 by means of a bracket 40.
  • FIG. 3 shows some possibilities of how the design according to FIGS. 1 and 2 can be modified.
  • a single longitudinal sealing strip 16 (FIG. 1)
  • two longitudinal sealing strips 16A and 16B can be provided, which are arranged one behind the other with respect to the circumferential direction.
  • a neutral zone is thus created between these two sealing strips, which serves for better sealing between the suction zone and the pressure zone.
  • Intermediate space 17 in turn increases - starting from the sealing strip 16A - in the circumferential direction, but only according to FIG. 3 as far as point C, which, as in FIG. 1, is located at a certain distance behind drain point B.
  • the thickness d of the space 17 has a maximum value D of approximately 20 to 50 mm.
  • This area, designated P in FIG. 3 corresponds approximately to the pressure zone of the suction roll 13. The length of this
  • the pressure zone P in the circumferential direction is at most one third of the inner circumference of the roller shell 14.
  • the area from the longitudinal sealing strip 16A to said point C is approximately equal to the suction zone S, which generally extends over more than 3/4 of the inner circumference of the roller shell 14 .
  • 3 can be made simpler than in accordance with FIG. 1.
  • a plurality of exhaust air openings 22 * can be provided at the top in the area of the longitudinal sealing strip 24a.
  • the suction chamber 24 (FIG. 1) can also be omitted in some cases.
  • the side wall 28 is preferably arranged in such a way that it diverges from the path of the support belt 10 in order to thereby suck the paper web onto the support belt. Likewise, it is again expedient that the opposite side wall 29 also diverges from the path of the support band 10.
  • the side walls 28 and 29 can be arranged parallel to the path of the support belt.
  • Papermaking machine with several drying cylinders 41 to 44 (and generally with further drying cylinders, not shown.
  • the drying cylinders are arranged in two rows one above the other.
  • the paper web to be dried runs alternately over the upper and lower drying cylinders in a known manner.
  • An upper endless drying screen 51 presses the paper web against the upper drying cylinders 41, 43.
  • a lower endless drying wire 52 presses the paper web 9 against the lower drying cylinders 42, 44.
  • Suction rollers 13 • are provided for guiding the drying fabrics 51, 52 from cylinder to cylinder, each of which is preferably close the outlet of the paper web from the preceding drying cylinder, preferably so that the straight path of the paper web 9 is the suction roll 13 'affects.
  • the sealing arrangement 16 is arranged in the area of the wrapping zone, that is to say in that part of the circumference of the suction roll which is touched by the drying screen 51 or 52 in question.
  • the sealing arrangement is preferably located at the point where the drying wire runs off the suction roll 13 '. In this way, the following is achieved: the suction roller 13 'can suck in air in the part of its circumference free of the drying wire and in the looping zone (in the area in front of the sealing arrangement 16) through the drying wire into the so-called
  • This pocket 49 is delimited by the paper web 9 and one of the drying cylinders, e.g. the lower drying cylinder 42 and through the opposite, the upper support belt 41 leading suction roller 13 '. So there is a ventilation of the pocket 49 so that the steam vapors emerging from the paper web 9 are better discharged laterally.
  • Another effect of the suction roller 13 ' is that the paper web 9 is first sucked into the drying screen 51 or 52 in question at the outlet point of each drying cylinder.

Landscapes

  • Paper (AREA)

Abstract

Le cylindre aspirant (13) comporte un bandage perforé (14) traversé par un élément de guidage d'air stationnaire (15). Ce dernier a une paroi de guidage dont la courbure (15') est telle que l'épaisseur radiale (d) de l'interstice (17) augmente dans le sens circonférentiel du bandage (14), à partir du point de sortie (16a) d'une barrette d'étanchéité longitudinale (16) jusqu'à l'entrée (16b) de cette barrette (16) qui est disposée à peu de distance du point d'aboutissement (A) d'une bande-support (10) avec une bande de papier sur le bandage (14) du cylindre aspirant (13).
PCT/EP1992/001743 1992-07-31 1992-07-31 Agencement avec un cylindre aspirant WO1994003675A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/001743 WO1994003675A1 (fr) 1992-07-31 1992-07-31 Agencement avec un cylindre aspirant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/001743 WO1994003675A1 (fr) 1992-07-31 1992-07-31 Agencement avec un cylindre aspirant

Publications (1)

Publication Number Publication Date
WO1994003675A1 true WO1994003675A1 (fr) 1994-02-17

Family

ID=8165672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/001743 WO1994003675A1 (fr) 1992-07-31 1992-07-31 Agencement avec un cylindre aspirant

Country Status (1)

Country Link
WO (1) WO1994003675A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5515619A (en) * 1993-08-06 1996-05-14 J.M. Voith Gmbh Flexibly mounted sealing strips of a vacuum roll for a web dryer
EP0787854A1 (fr) * 1996-01-30 1997-08-06 Voith Sulzer Papiermaschinen GmbH Dispositif pour guider une bande fibreuse dans une section de séchage à toile unique
EP0802277A3 (fr) * 1996-04-18 1998-04-08 Voith Sulzer Papiermaschinen GmbH Machine pour la fabrication d'une bande de matériau
WO2000050693A1 (fr) * 1999-02-22 2000-08-31 Metso Paper, Inc. Appareil de soufflage dans une machine a papier ou analogue
CN106120424A (zh) * 2015-05-04 2016-11-16 维美德技术有限公司 改装套件、运行性部件及改进抽吸箱的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156304B (de) * 1958-08-14 1963-10-24 Voith Gmbh J M Verfahren und Vorrichtung zum Entwaessern von aufgeschwemmten Faserstoffen zur Herstellung von Papier- oder Kartonbahnen
DE1461087A1 (de) * 1965-11-19 1968-11-28 Escher Wyss Gmbh Blas- oder Saugwalze,insbesondere zum Trocknen von Papiermaschinenfilzen
WO1981001428A1 (fr) * 1979-11-20 1981-05-28 Valmet Oy Dispositif pour la section de sechage d'une machine a papier
DE3443603A1 (de) * 1983-12-02 1985-07-25 Honeycomb Systems, Inc., Biddeford, Me. Geblaese fuer eine papierbahn-trocknungseinrichtung
DE3828743A1 (de) * 1987-09-02 1989-03-23 Valmet Paper Machinery Inc Verfahren und vorrichtung in einer einsieb-trockengruppe einer papiermaschine
FR2644182A1 (fr) * 1989-03-08 1990-09-14 Voith Gmbh Rouleau de renvoi pour bande poreuse, notamment pour toile de sechage dans une machine a papier
WO1990012151A1 (fr) * 1989-04-01 1990-10-18 J.M. Voith Gmbh Dispositif de sechage a toile unique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156304B (de) * 1958-08-14 1963-10-24 Voith Gmbh J M Verfahren und Vorrichtung zum Entwaessern von aufgeschwemmten Faserstoffen zur Herstellung von Papier- oder Kartonbahnen
DE1461087A1 (de) * 1965-11-19 1968-11-28 Escher Wyss Gmbh Blas- oder Saugwalze,insbesondere zum Trocknen von Papiermaschinenfilzen
WO1981001428A1 (fr) * 1979-11-20 1981-05-28 Valmet Oy Dispositif pour la section de sechage d'une machine a papier
DE3443603A1 (de) * 1983-12-02 1985-07-25 Honeycomb Systems, Inc., Biddeford, Me. Geblaese fuer eine papierbahn-trocknungseinrichtung
DE3828743A1 (de) * 1987-09-02 1989-03-23 Valmet Paper Machinery Inc Verfahren und vorrichtung in einer einsieb-trockengruppe einer papiermaschine
FR2644182A1 (fr) * 1989-03-08 1990-09-14 Voith Gmbh Rouleau de renvoi pour bande poreuse, notamment pour toile de sechage dans une machine a papier
WO1990012151A1 (fr) * 1989-04-01 1990-10-18 J.M. Voith Gmbh Dispositif de sechage a toile unique

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5515619A (en) * 1993-08-06 1996-05-14 J.M. Voith Gmbh Flexibly mounted sealing strips of a vacuum roll for a web dryer
EP0787854A1 (fr) * 1996-01-30 1997-08-06 Voith Sulzer Papiermaschinen GmbH Dispositif pour guider une bande fibreuse dans une section de séchage à toile unique
US5782009A (en) * 1996-01-30 1998-07-21 Voith Sulzer Papiermaschinen Gmbh Device for guiding a sheet of fibrous material in a single-row dryer part
EP1193343A2 (fr) * 1996-01-30 2002-04-03 Voith Paper Patent GmbH Dispositif pour guider une bande fibreuse dans une section de séchage à une rangée
EP1193343A3 (fr) * 1996-01-30 2002-07-10 Voith Paper Patent GmbH Dispositif pour guider une bande fibreuse dans une section de séchage à une rangée
EP0802277A3 (fr) * 1996-04-18 1998-04-08 Voith Sulzer Papiermaschinen GmbH Machine pour la fabrication d'une bande de matériau
US5829164A (en) * 1996-04-18 1998-11-03 Voith Sulzer Papiermaschinen Gmbh Method and machine for drying a material web with guide rollers
WO2000050693A1 (fr) * 1999-02-22 2000-08-31 Metso Paper, Inc. Appareil de soufflage dans une machine a papier ou analogue
WO2000050692A1 (fr) * 1999-02-22 2000-08-31 Metso Paper, Inc. Procede et appareil concernant la section sechage d'une machine a papier ou equivalent
US6910282B1 (en) 1999-02-22 2005-06-28 Metso Paper, Inc. Method and apparatus in the drying section of a paper machine or the like
CN106120424A (zh) * 2015-05-04 2016-11-16 维美德技术有限公司 改装套件、运行性部件及改进抽吸箱的方法

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