US20200087857A1 - Machine and method for the production of a fibrous web - Google Patents

Machine and method for the production of a fibrous web Download PDF

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Publication number
US20200087857A1
US20200087857A1 US16/572,819 US201916572819A US2020087857A1 US 20200087857 A1 US20200087857 A1 US 20200087857A1 US 201916572819 A US201916572819 A US 201916572819A US 2020087857 A1 US2020087857 A1 US 2020087857A1
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US
United States
Prior art keywords
press
roll
belt
fibrous web
machine
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
US16/572,819
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English (en)
Inventor
Caio Penteado
Jonas Bergström
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: BERGSTROM, JONAS, Penteado, Caio
Publication of US20200087857A1 publication Critical patent/US20200087857A1/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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/029—Wet presses using special water-receiving belts
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • 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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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
    • D21F5/181—Drying webs by hot air on Yankee cylinder
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper

Definitions

  • the invention relates to a machine for the production of a fibrous web.
  • Document EP2796617 B1 discloses a Crescent former paper machine for the production of tissue paper.
  • the tissue web is formed in a forming region between an outer wire and a felt and in a first configuration it is carried—supported on the felt together with an additional felt, through a shoe press and is subsequently transferred in a roll nip to the surface of the downstream drying cylinder.
  • the tissue web is not routed through the shoe press nip but is transferred from the forming region directly onto the surface of the downstream drying cylinder.
  • the arrangement of a suction felt guide roll for conditioning of the felt prior to the shoe press is proposed.
  • a disadvantage of this arrangement is a limited increase in quality, in particular of the specific volume of the tissue web.
  • the present invention produces a tissue web, with a forming region including a forming roll and a permeable inner belt which at least partially wraps around a forming roll together with an outer belt for the formation of the fibrous web, with a press device immediately downstream from the forming region.
  • the press device includes a press nip which is formed by a press roll and a mating roll for additional dewatering of the fibrous web, wherein the press nip is the first nip of the press device.
  • the fibrous web is carried through the press nip supported between the inner belt and a lower press belt.
  • a drying cylinder is downstream from the press device, wherein the fibrous web is carried and supported on the inner belt—in a transfer nip which is formed between a transfer roll and the drying cylinder—from the forming region until the transfer to the heated surface of the drying cylinder.
  • An embodiment of the present invention includes a machine for the manufacture of a fibrous web, in particular a tissue web, having a forming region with a forming roll and a permeable inner belt, which at least partially wraps around the forming roll together with an outer belt for the formation of the fibrous web.
  • a press device immediately downstream from the forming region that includes a press nip which is formed by a press roll and a mating roll for additional dewatering of the fibrous web.
  • the press nip is the first nip of the press device, wherein the fibrous web—supported between the inner belt and a lower press belt—is carried through the press nip.
  • drying cylinder downstream from the press device, wherein the fibrous web is carried—from the forming region until the transfer in a transfer nip which is formed between a transfer roll and the drying cylinder—supported on the inner belt to the heated surface of the drying cylinder.
  • the inner belt for providing texture to the fibrous web is textured and that the transfer roll is in the embodiment of a shoe roll in order to provide an extended transfer nip.
  • the machine of the present invention is characterized by a simple construction with which a fibrous web, in particular a tissue web having a high specific volume, and for which at the same time a high dry content can be achieved in the press device, can be produced reliably at a high speed.
  • a fibrous web in particular a tissue web having a high specific volume
  • a high dry content can be achieved in the press device
  • the inner belt is permeable, in other words air and water permeable. This allows two-sided dewatering of the fibrous web in the press nip, wherein the extracted water is partially, in other words to a low extent, absorbed by the inner belt and the lower press belt.
  • the lower press belt which is in contact with the fibrous web, can be optimized in regard to quality, for example the specific volume of the produced fibrous web and a coordinated water absorption. This allows gentle dewatering without damaging or crushing the fibrous web. Thus, higher liner forces can be run in the press nip. Web travel without transfer between two clothings allows a reliable and stable operation of the machine, even at high output and speed.
  • the transfer roll in the embodiment of a shoe roll is advantageous in the transfer of the fibrous web from the inner belt to the heated surface of the drying cylinder. Due to the texture of the inner belt that is impressed into the fibrous web, the web is only selectively compressed in the transfer nip, which is operated at only a low line force or low forming pressure. Thus, the increased dwell time of the fibrous web in the press nip has a positive effect on the transfer to the drying cylinder.
  • An additional advantage of the solution is the compact design in terms of the low space requirement in regard to the height of the machine.
  • the length of the lower press belt can be kept short.
  • the routing of the felt of the lower press belt can thus extend exclusively above the machine floor. This eliminates the requirement for a basement.
  • this machine can also be installed in existing machine halls without basements, for the production of high-grade tissue webs with a high specific volume, for example for kitchen towels.
  • the inner textured belt can be a woven belt. It can also be in the embodiment of a permeable, at least on the fibrous web side, textured membrane or film.
  • the drying cylinder can be designed as a Yankee drying cylinder, in particular when producing fibrous tissue webs.
  • the design of Yankee drying cylinders is known. They are characterized for example by large diameters in excess of 6 m and are steam heated.
  • this machine can be converted easily and cost effectively.
  • the inner textured belt can be replaced by a conventional press felt and the press device can be deactivated. This means that the press device is either bypassed by the travel path of this press felt or that this press felt is routed through the opened press nip. This arrangement is thus consistent with a known Crescent former machine.
  • the lower press belt is designed as a water absorbing press belt, in particular as a press felt.
  • the press roll can be arranged within the loop that is created by the inner belt and the mating roll can be arranged within the loop that is created by the lower press belt. It is also conceivable to arrange the press roll within the loop that is created by the lower press belt and to arrange the mating roll within the loop that is created by the inner belt.
  • the press nip can be designed as a separate press nip, in other words as a single press nip. This results in a simple design of the machine.
  • the press roll can be designed as a shoe roll to form an extended press nip.
  • higher line forces can be run in the press nip.
  • the extended press nip in this shoe press at the beginning of the press device, that is directly after the forming region allows gentle dewatering without damaging or crushing the fibrous web.
  • a higher dry content can be achieved in the fibrous web than is the case for example with a belt press.
  • the press roll is also possible to design the press roll as a solid surface roll.
  • the mating roll may be in the embodiment of a suction roll.
  • dewatering in particular the direction of dewatering, can be influenced.
  • a steam blow box can be assigned to the fibrous web before the press nip, in order to impinge the fibrous web with steam.
  • a suction device located within the loop that is created by the inner belt, is arranged prior to the press nip when viewed in machine direction. This enables the texture of the fibrous web that was produced by the inner textured belt to be stabilized and maintained.
  • the suction device is supplied with vacuum.
  • a blower hood may be allocated to the suction device for direct impingement of the fibrous web with steam and/or hot dry air and/or hot moist air.
  • a suction guide roll which is partially wrapped by the inner belt, is arranged within the loop created by the inner belt and between the press nip and the transfer roll.
  • the suction guide roll can be supplied with vacuum. Web travel can thereby be stabilized and the dry content for certain fibrous web grades can be increased prior to the drying cylinder.
  • This arrangement is especially advantageous if the transfer roll is in the embodiment of a shoe press roll, according to the present invention. This ensures a reliable transfer of the fibrous web to the drying cylinder, even at a high dry content.
  • the suction guide roll can be partially wrapped by a permeable press belt in direct contact with the fibrous web.
  • the press belt can have an increased belt tension, for example, of higher than 20 kN/m, preferably higher than 30 kN/m. As a result the dry content of the fibrous web can be even further increased in certain fibrous web grades prior to transfer onto the drying cylinder.
  • a hood can be provided within the loop created by the press belt and in the region of the wrap for indirect impingement of the fibrous web with steam and/or hot dry air and/or hot moist air.
  • the dry content of the fibrous web can be even further increased in certain fibrous web grades prior to the transfer to the drying cylinder.
  • the lower press belt is preferably designed as a water absorbing press belt, in particular as a press felt.
  • FIG. 1 illustrates a first embodiment of a machine according to the present invention in a simplified schematic representation
  • FIG. 2 illustrates a second embodiment of a machine according to the present invention in a simplified schematic representation
  • FIG. 3 illustrates a third embodiment of a machine according to the present invention in another simplified schematic representation.
  • Machine 1 for the production of a fibrous web 2 in this example a tissue web, includes a forming region having a forming roll 5 and an inner belt 4 which, together with an outer belt 5 , wraps at least partially around forming roll 5 .
  • a headbox 6 feeds a fibrous stock suspension between belts 3 , 4 .
  • This suspension is dewatered primarily in the common wrap-around region of belts 3 , 4 in the region of forming roll 5 , thus forming tissue web 2 and being transported on inner belt 4 onto and through a directly following press device 7 .
  • press device 7 includes a press roll 8 arranged at the top and a mating roll 9 , arranged at the bottom, which together form a press nip 24 for further dewatering of tissue web 2 .
  • Mating roll 9 and press roll 8 can also be arranged conversely.
  • Mating roll 8 is arranged as a suction roll with applied vacuum.
  • Press nip 24 of press device 7 is the first press nip 24 after the forming region.
  • a suction device 21 Upstream from press nip 24 , viewed in a machine direction 22 , a suction device 21 , in this case a suction box 21 which is supplied with vacuum is located within the loop created by inner belt 4 .
  • a blower hood 20 is assigned to suction box 21 for direct impingement of fibrous web 2 with steam and/or hot dry air and/or hot moist air.
  • a lower press belt 11 which is in direct contact with tissue web 2 , also runs through press nip 24 .
  • Lower press belt 11 is in the embodiment of a water absorbing press felt.
  • tissue web 2 After additional dewatering of tissue web 2 in press device 7 , tissue web 2 , supported on inner belt 4 is led around a transfer roll 13 in the embodiment of a shoe roll.
  • the latter together with a drying cylinder 14 , in this case a Yankee drying cylinder 14 , creates a transfer nip 12 in which tissue web 2 is transferred from inner belt 4 onto the heated surface of Yankee drying cylinder 14 and continues to be thermally dried.
  • Tissue web 2 is moreover supplied with hot air and/or overheated steam by way of a dryer hood 15 that is located in the region of Yankee drying cylinder 14 .
  • Tissue web 2 is subsequently creped on a doctor blade 16 and is removed from the surface of the Yankee drying cylinder and is transported directly or indirectly to a winding station, which is not illustrated herein.
  • Tissue web 2 is thus transported by one single belt 4 from the forming region to Yankee drying cylinder 14 .
  • a transfer to an intermediate belt is not required for the production of qualitatively high-grade tissue webs with a high specific volume. This promotes good runability of the machine.
  • the inner belt is permeable, in other words air and water permeable, and at least on the side that is in contact with tissue web 2 it is textured in order to provide texture to tissue web 2 .
  • Providing tissue web 2 with texture causes a high specific volume which is also referred to as bulk.
  • the inner textured belt is a woven belt. It can also be in the embodiment of a permeable—at least on the fibrous web side—textured membrane or film.
  • Machine 1 makes two-sided dewatering of fibrous web 2 in press nip 24 possible, wherein the extracted water is partially absorbed by inner belt 4 and primarily by lower press belt 11 .
  • Lower press belt 11 which is in contact with fibrous web 2 , can be optimized in regard to quality, for example the specific volume of produced fibrous web 2 and in regard to the dewatering capacity.
  • transfer roll 13 is designed as a shoe press roll.
  • Machine 1 is very compact in regard to its height.
  • the length of lower press belt 11 is short.
  • the travel path of the felt of lower press belt 11 is arranged exclusively above machine floor 23 . This eliminates the requirement for a basement which is necessary in known machines for the production of tissue webs having high bulk.
  • this machine can also be installed in existing machine halls without basements, for the production of high-grade tissue webs 2 with a high specific volume, for example for kitchen towels.
  • FIG. 2 there is shown a second embodiment of inventive machine 1 in a simplified schematic representation. It differs from the embodiment shown in FIG. 1 in regard to a suction guide roll 17 which is arranged within the loop created by inner belt 4 and between press nip 24 and transfer roll 13 and which is partially wrapped by inner belt 4 . Web travel can thereby be stabilized and the dry content for certain tissue web grades can be increased prior to drying cylinder 14 .
  • This arrangement is especially advantageous together with transfer roll 13 which, according to the invention is designed as a shoe press roll.
  • FIG. 3 there is shown a third embodiment of inventive machine 1 in simplified schematic representation. It differs from the embodiment shown in FIG. 2 in that suction guide roll 17 is partially wrapped by a permeable press belt 18 and in that it is in direct contact with tissue web 2 .
  • the press belt applies pressure on tissue web 2 to increase the dry content.
  • Press belt 18 has an increased belt tension of more than 20 kN/m, preferably more than 30 kN/m.
  • the dry content of tissue web 2 can thus be increased in certain tissue web grades prior to the transfer to drying cylinder 14 .
  • a hood 19 is provided within the loop created by press belt 18 and in the region of the wrap for indirect impingement of the fibrous web with steam and/or hot dry air and/or hot moist air.
  • the dry content of fibrous web 2 can be even further increased in certain tissue web grades prior to the transfer to the drying cylinder 14 .

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  • Paper (AREA)
US16/572,819 2018-09-17 2019-09-17 Machine and method for the production of a fibrous web Abandoned US20200087857A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122632.2A DE102018122632A1 (de) 2018-09-17 2018-09-17 Maschine und Verfahren zur Herstellung einer Faserstoffbahn
DE102018122632.2 2018-09-17

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Publication Number Publication Date
US20200087857A1 true US20200087857A1 (en) 2020-03-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US16/572,819 Abandoned US20200087857A1 (en) 2018-09-17 2019-09-17 Machine and method for the production of a fibrous web

Country Status (4)

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US (1) US20200087857A1 (de)
EP (1) EP3623525A1 (de)
CN (1) CN110904716A (de)
DE (1) DE102018122632A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10745858B1 (en) * 2018-06-27 2020-08-18 Kimberly-Clark Worldwide, Inc. Through-air drying apparatus and methods of manufacture

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT525216A1 (de) * 2021-07-15 2023-01-15 Berndorf Band Gmbh Pressvorrichtung mit einer Druckrolle

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US6547924B2 (en) 1998-03-20 2003-04-15 Metso Paper Karlstad Ab Paper machine for and method of manufacturing textured soft paper
SE529130C2 (sv) * 2004-05-26 2007-05-08 Metso Paper Karlstad Ab Pappersmaskin för framställning av mjukpapper, metod för framställning av mjukpapper samt mjukpapper
WO2009067079A1 (en) * 2007-11-20 2009-05-28 Metso Paper Karlstad Ab Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor
SE531891C2 (sv) * 2007-11-20 2009-09-01 Metso Paper Karlstad Ab Struktureringsbeklädnad och förfarande för framställning av en tissuepappersbana
DE102008000211A1 (de) * 2008-02-01 2009-08-06 Voith Patent Gmbh Vorrichtung zur Herstellung von Tissuebahnen
DE102008000226A1 (de) * 2008-02-04 2009-08-06 Voith Patent Gmbh Vorrichtung zur Entwässerung von Faserstoffbahnen, insbesondere Tissuebahnen
AT508331B1 (de) * 2009-05-19 2011-05-15 Andritz Ag Maschf Verfahren und vorrichtung zur behandlung einer faserstoffbahn in einer langnip-presseinheit
DE102010039456A1 (de) * 2010-08-18 2012-02-23 Voith Patent Gmbh Vorrichtung zur Herstellung einer Materialbahn
DE102011007568A1 (de) * 2011-04-18 2012-10-18 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Materialbahn
PL2796617T3 (pl) 2013-04-22 2016-12-30 Zastosowanie prasy ze stałym elementem odwadniającym do produkcji bibuły
EP3510196A4 (de) * 2016-09-12 2020-02-19 Structured I, LLC Former von wasserdeponiertem geflecht, das ein strukturiertes gewebe als den äusseren draht verwendet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10745858B1 (en) * 2018-06-27 2020-08-18 Kimberly-Clark Worldwide, Inc. Through-air drying apparatus and methods of manufacture

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Publication number Publication date
EP3623525A1 (de) 2020-03-18
DE102018122632A1 (de) 2020-03-19
CN110904716A (zh) 2020-03-24

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