EP2391769A1 - Dispositif pour fabriquer une bande de matériau - Google Patents

Dispositif pour fabriquer une bande de matériau

Info

Publication number
EP2391769A1
EP2391769A1 EP10700256A EP10700256A EP2391769A1 EP 2391769 A1 EP2391769 A1 EP 2391769A1 EP 10700256 A EP10700256 A EP 10700256A EP 10700256 A EP10700256 A EP 10700256A EP 2391769 A1 EP2391769 A1 EP 2391769A1
Authority
EP
European Patent Office
Prior art keywords
drying
section
web
material web
drying device
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
EP10700256A
Other languages
German (de)
English (en)
Other versions
EP2391769B1 (fr
Inventor
Lars Adalid Damerau
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
Publication of EP2391769A1 publication Critical patent/EP2391769A1/fr
Application granted granted Critical
Publication of EP2391769B1 publication Critical patent/EP2391769B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders
    • 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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • D21F5/18—Drying webs by hot air

Definitions

  • the invention relates to a drying device for drying a material web, in particular a paper, board or tissue web, which has an upper side and a lower side.
  • the drying device comprises at least a first drying section and a second drying section, wherein the first drying section is substantially rectilinear and has a first impingement hood for direct loading of the upper side of the material web with hot drying medium.
  • the underside of the material web is assigned a first drying wire for guiding the material web through the first drying section.
  • the second drying section has a second impingement flow hood for direct loading of the lower side of the material web with hot drying medium, wherein the upper side of the material web is assigned a second drying fabric for guiding the material web through the second drying section and the second drying fabric is guided over at least one support surface.
  • Such drying devices are used in modern paper machines for high production speeds. These high-performance dryers work according to the impact flow principle. The paper web is charged with hot air and dried intensively. As the speed increases, the importance and the rate of drying of such high-performance dryers increases more and more. Until the first free draw of the paper web in the subsequent dryer section with drying cylinders, a certain minimum dry content is required for each type of paper so that the paper web has sufficient strength and does not tear. It follows for the design of the dryer section of a paper machine, that the length of the high-performance drying section increases more and more in comparison to the subsequent conventional drying with drying cylinders.
  • the drying capacity required for increasing the machine speed can be increased by extending the horizontal impingement flow path of the first high-performance dryer.
  • a disadvantage is the runability of the paper web, which deteriorates with high machine speed. This is especially true in the second drying section in which the paper web underside is dried in impingement dryer.
  • the respective drying wire is supported by rollers in the first and in the second drying section. As a result, narrowing and widening gaps between the drying wire and the rollers are produced on each roller. These lead to pressure pulses, which detach the web, especially at the edges of the dryer fabric. This can lead to web breaks and wrinkles, especially at high speeds.
  • a drying device for drying a material web, in particular a paper, board or tissue web, which has an upper side and a lower side.
  • the drying device comprises at least a first drying section and a second drying section, wherein the first drying section is substantially rectilinear and has a first impingement hood for direct loading of the upper side of the material web with hot drying medium.
  • the underside of the material web is assigned a first drying wire for guiding the material web through the first drying section.
  • the second drying section has a second impingement flow hood for direct loading of the lower side of the material web with hot drying medium, wherein the upper side of the material web is assigned a second drying fabric for guiding the material web through the second drying section and the second drying fabric is guided over at least one support surface.
  • the solution according to the invention is characterized in that the at least one support surface is designed to be air-permeable and low-pulsation.
  • the inventive solution ensures that the bottom of the paper web safely and reliably rests on the dryer fabric, even at high speeds.
  • This is particularly advantageous in the case of drying by means of impingement-flow dryers, in which the material web is not guided between two dryer fabrics, so that the hot drying medium can impinge directly on the underside of the material web and thus dry it efficiently.
  • Due to the low-pulsation design of the support surface of the dryer fabric no pressure pulses which lead to the detachment of the web from the dryer fabric.
  • An air-permeable support surface makes it possible to suction the support surface and thus to hold the material web even more firmly on the dryer fabric. This is especially true when drying the Bottom of the web important to keep the web against gravity on the drying wire.
  • Hot air and / or steam can be used as the drying medium.
  • the invention has a particularly advantageous effect at speeds of greater than 1700 m / min, in particular greater than 1800 m / min.
  • the drying capacity can be flexibly adapted to the production requirements by the adaptation of the length of this first drying section during its design.
  • a straight and / or a slightly curved course of the drying section to understand.
  • a slightly curved course has the advantage of better stabilization of the web on the dryer fabric.
  • the curvature has a radius of greater than 10 m, preferably greater than 15 m.
  • the at least one support surface is evacuated.
  • a small negative pressure is sufficient. It can be in the range between 1 hPa to 200 hPa, in particular between 1 hPa and 100 hPa.
  • the first drying section may be formed with a support surface corresponding to the support surface of the second drying section.
  • the support surface perforations or holes or openings.
  • the support surface is designed as a stationary, flat and / or curved plate in the web running direction. This design is inexpensive to manufacture.
  • Support roller is formed.
  • this solution has the advantage that no relative movement between the dryer and the support surface occurs and thus no wear due to friction.
  • the backup roll has a perforated, for example drilled coat. For a sufficient drying capacity, a diameter in the range between 3 m and 6 m is sufficient.
  • the suction box can be divided in the web running direction into several sections with different pressures.
  • the second drying section immediately follows the first drying section.
  • the material web is transferred from the first drying wire to the second drying wire with the assistance of a suction zone arranged in the second drying wire.
  • the first impingement flow hood and / or the second impingement flow hood are / are formed in the web running direction and / or in the transverse direction by a plurality of part hoods.
  • the drying performance of the first impingement flow hood and / or the second impingement flow hood can be set or regulated in the web running direction and / or in the transverse direction.
  • the first drying wire is also guided over at least one air-permeable and low-pulsation supporting surface, corresponding to the support surface for the second drying wire.
  • the invention relates to a paper machine for producing a material web, in particular a paper, board or tissue web, comprising a press section and a drying section, wherein the drying section comprises at least one drying device according to the invention.
  • the drying device according to the invention is preceded by a press section consisting of at least one extended press nip.
  • press sections are also referred to as Single NipcoFlex presses.
  • press sections come into question, which consist of two consecutively arranged extended press nips.
  • Such press sections are referred to as Tandem NipcoFlex presses.
  • Prolonged press nips are preferably formed from a respective shoe roll with a counter roll, wherein the paper web is guided between two bands through the nips.
  • the bands may consist of two felts or even of a felt and a smooth, air-permeable or impermeable band.
  • the drying device is preceded by a press section with at least one extended press nip and a downstream smoothing device.
  • the smoothing device is formed by a roller and / or belt with a smooth surface and an evacuated counter-roller.
  • the material web is transferred from a lower clothing of the last press nip with a smooth surface to a transfer belt and from there to a counter-roller wraps around, air-permeable fabric and passed through the smoothing nip of the smoothing device.
  • the drying device is preceded by a press section with a compact press and a downstream smoothing device.
  • the smoothing device is formed by a roller and / or belt with a smooth surface and an evacuated counter-roller.
  • the material web is transferred from a center belt with a smooth surface, which wraps around the central roller, onto a transfer belt and from there onto an air-permeable clothing wound around the counter-roller of the smoothing device and guided through the smoothing nip of the smoothing device.
  • the material web is guided in a closed train through the press section and through the drying device.
  • the solution according to the invention in addition to a stable web run during the production operation, also permits a web-width transfer of the paper web 100 after a demolition or when the paper machine is restarted. This is reliably possible only with pulsation running support surfaces. Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.
  • Figure 1 shows a first embodiment of a paper machine with a drying device according to the invention with pre-stored press section
  • Figure 2 shows a second embodiment of a paper machine with a drying device according to the invention with pre-stored press section with smoothing device
  • Figure 3 shows a third embodiment of a paper machine with a drying device according to the invention with pre-stored press section with smoothing device
  • FIG. 1 shows an embodiment of the drying device 1 of a paper machine.
  • the drying device consists of a slightly curved first drying section 2 and an immediately following second drying section 3.
  • the paper web 100 is transferred from a transfer belt 30 in the region of a suction roll 5 to the drying wire 20. This is supported in the region of the first drying section 2 by guide rollers 6.
  • the arrangement of the guide rollers form a polygon, which corresponds to a radius of 15 m.
  • the top 101 of the paper web 100 is free and not covered by another sieve.
  • the hot drying medium emerging from the impingement flow hood 4 can thus reach the paper surface 101 unhindered.
  • the paper web 100 and the first drying wire 20 are guided around a suction roll 7.
  • a suction element is arranged to transfer the paper web 100 from the first drying wire 20 to the second drying wire 22.
  • the suction element can also be realized by a suction zone in the support cylinder 10.
  • the second drying wire 22 partially wraps around a support cylinder 10, a steam-heated drying cylinder 11, a vacuumed deflection roller 12 and a further drying cylinder 13.
  • the second drying wire 3 is separated from the paper web and returned via the guide rollers 9.
  • the paper web is guided in a free train to the next drying section.
  • the support cylinder 10 has a drilled lateral surface 103, which is evacuated via a suction box in the wrap area of the second dryer fabric 3.
  • the underside 102 of the paper web 100 is free and not covered by another sieve.
  • the hot drying medium emerging from the impingement flow hood 8 can thus reach the paper surface 101 unhindered.
  • the impingement flow hood 8 is divided into two in this example. A one-piece design but also possible.
  • the air volume flow and the temperature can be adjusted separately in each part.
  • both hood parts 8 can be opened, so that the paper residues can fall into the machine cellar for disposal.
  • the negative pressure in the suction box of the support cylinder 10 is 40 hPa.
  • the drying device 1 is preceded by a press section 200.
  • the paper web 100 is fed from a forming section to the top felt 50 of the first
  • the web 100 is transferred through the transfer belt 30 from the lower belt 41 of the second press 202 and transferred to the drying device 1.
  • the paper machine in Figure 2 differs from the machine shown in Figure 1 only by the execution of the press section 205.
  • the press section 205 is composed of only one extended press nip 203 and a downstream Glättpresse 300 together.
  • the paper web is removed by the upper felt 40 of the press 203 from the forming fabric 500 and guided by the press nip 203, which is formed by the shoe roll 42 and the backing roll 43. Thereafter, the web is transferred by the transfer belt 304 to the calender 300.
  • This is formed from an evacuated counter roll 302, which is wrapped by an air-permeable, fine felt 303 and a smooth smoothing roll 301. This smoothing roll smoothes the top 101 of the paper web.
  • FIG 3 shows the drying device 1 according to the invention in combination with another variant of a press section 206.
  • This press section 206 is formed by a so-called compact press 400 with three press nips and a smoothing press 300 analogous to FIG.
  • the compact press 400 produces a two-sided paper web 100 with respect to the paper web smoothness.
  • the top 101 after the press is rougher than the bottom 102. This roughness difference is compensated in the subsequent smoothing press 300 by smoothing the top 101.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un dispositif de séchage (1) pour sécher une bande de matériau (100), en particulier une bande de papier, de carton ou de papier sanitaire et domestique, présentant une face supérieure (101) et une face inférieure (102). Ce dispositif de séchage (1) comprend au moins une première section de séchage (2) et une deuxième section de séchage (3), la première section de séchage (2) s'étendant sensiblement en ligne droite et présentant un premier capot à impact de jets (4) pour soumettre directement la face supérieure (101) de la bande de matériau (100) à l'action d'un agent de séchage chaud. Une première toile de séchage (20) est associée à la face inférieure (102) de la bande de matériau (100) pour guider la bande de matériau (100) à travers la première section de séchage (2). La deuxième section de séchage (3) présente un deuxième capot à impact de jets (8) pour soumettre directement la face inférieure (102) de la bande de matériau (100) à l'action de l'agent de séchage chaud, une deuxième toile de séchage (22) étant associée à la face supérieure (101) de la bande de matériau (100) pour guider la bande de matériau (100) à travers la deuxième section de séchage (3), et cette deuxième toile de séchage (22) étant guidée par au moins une surface d'appui (103). Le dispositif de séchage (1) selon l'invention se caractérise en ce que la ou les surfaces d'appui (103) sont perméables à l'air et génèrent peu de pulsations.
EP10700256A 2009-01-30 2010-01-15 Dispositif pour fabriquer une bande de matériau Not-in-force EP2391769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910000507 DE102009000507A1 (de) 2009-01-30 2009-01-30 Vorrichtung zur Herstellung einer Materialbahn
PCT/EP2010/050428 WO2010086234A1 (fr) 2009-01-30 2010-01-15 Dispositif pour fabriquer une bande de matériau

Publications (2)

Publication Number Publication Date
EP2391769A1 true EP2391769A1 (fr) 2011-12-07
EP2391769B1 EP2391769B1 (fr) 2012-12-19

Family

ID=42306615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10700256A Not-in-force EP2391769B1 (fr) 2009-01-30 2010-01-15 Dispositif pour fabriquer une bande de matériau

Country Status (4)

Country Link
EP (1) EP2391769B1 (fr)
CN (1) CN102301068A (fr)
DE (1) DE102009000507A1 (fr)
WO (1) WO2010086234A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784212A1 (fr) * 2013-03-28 2014-10-01 Valmet Technologies, Inc. Machine de fabrication de papier ou de carton et procédé de fabrication de papier ou carton à forte teneur en charge
CN103726388A (zh) * 2013-12-19 2014-04-16 云南中烟昆船瑞升科技有限公司 一种再造烟叶高效脱水压榨装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI100013B (fi) * 1993-03-22 1997-08-15 Valmet Paper Machinery Inc Kuivatusmenetelmä ja kuivatusmoduli sekä niitä soveltavat kuivatusosat etenkin nopeakäyntiseen paperikoneeseen
FI102623B (fi) * 1995-10-04 1999-01-15 Valmet Corp Menetelmä ja laite paperikoneessa
FI104100B (fi) * 1998-06-10 1999-11-15 Valmet Corp Integroitu paperikone
WO2001000925A1 (fr) * 1999-06-29 2001-01-04 Valmet-Karlstad Ab Appareil et procede permettant de fabriquer du papier de soie texture
EP1072722B1 (fr) * 1999-07-27 2004-12-01 Voith Paper Patent GmbH Section de séchage
DE10137095A1 (de) * 2001-07-30 2003-02-13 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
FI123824B (fi) 2006-04-19 2013-11-15 Metso Paper Inc Rainan parannettu ajettavuus materiaalirainakoneessa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010086234A1 *

Also Published As

Publication number Publication date
CN102301068A (zh) 2011-12-28
DE102009000507A1 (de) 2010-08-05
WO2010086234A1 (fr) 2010-08-05
EP2391769B1 (fr) 2012-12-19

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