EP0400843A2 - Presspartie für Papier-, Karton- oder Faserbreitrocknungsmaschine - Google Patents

Presspartie für Papier-, Karton- oder Faserbreitrocknungsmaschine Download PDF

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Publication number
EP0400843A2
EP0400843A2 EP90305355A EP90305355A EP0400843A2 EP 0400843 A2 EP0400843 A2 EP 0400843A2 EP 90305355 A EP90305355 A EP 90305355A EP 90305355 A EP90305355 A EP 90305355A EP 0400843 A2 EP0400843 A2 EP 0400843A2
Authority
EP
European Patent Office
Prior art keywords
press
web
felt
nips
press section
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.)
Withdrawn
Application number
EP90305355A
Other languages
English (en)
French (fr)
Other versions
EP0400843A3 (de
Inventor
Jukka Kohosalmi
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.)
Valmet Technologies Oy
Original Assignee
Valmet Ahlstrom Oy
Valmet Karhula Inc
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 Valmet Ahlstrom Oy, Valmet Karhula Inc filed Critical Valmet Ahlstrom Oy
Publication of EP0400843A2 publication Critical patent/EP0400843A2/de
Publication of EP0400843A3 publication Critical patent/EP0400843A3/de
Withdrawn legal-status Critical Current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
    • D21F3/04—Arrangements thereof
    • 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

Definitions

  • the present invention relates to a press section of a paper, cardboard, or pulp drying machine.
  • the press section in the direction of web passage, there are several separate press nips, which remove water from the web to a substantial extent.
  • Each press nip is formed between two press rolls, and in the two first of these nips the web runs through two water-­receiving press felts so that dewatering takes place in the said nips through both surfaces of the web, and at least the two first said nips are formed between two open-faced rolls.
  • the perforation of a press-suction roll may leave a marking in the web, and this impairs the appearance of the paper, and may affect the surface properties of the paper.
  • the drilling of the press-suction rolls is a difficult and costly procedure.
  • the perforation reduces the strength of the shell of the roll, and because of this it is necessary to use special metal alloys as material for the rolls, together with the requirement of great thickness of the shell, which result in high material costs.
  • press-­suction rolls consume large quantities or air.
  • the press section In the Finnish patent application No. 833132 is presented a press section of a paper machine, where the press section consists of separate presses. As disclosed in the said FI patent application, the press section is meant for dewatering that takes place on one surface, because, as disclosed in the FI patent application, the water absorbing press felt is arranged only on one side of the web. In addition, at least in one press nip of the press section is used an expensive press-suction roll. As disclosed in the said patent application, the goal has been to achieve a closed draw of the web between the press nips so that on opposite side of the web in relation to the felts there is arranged a transfer felt, which supports the web and transfers it from one nip to another. However, in the FI patent application No.
  • the transfer felt is smooth-faced and is not permeable to water.
  • a solution that resembles the above mentioned FI patent application is presented in the Finnish patent application No. 823187, where the press section includes press felts on one side of the web, and on the opposite side of the web water-non-­receiving transfer felt to achieve a closed draw of the web.
  • the solution in this patent application does not achieve dewatering from both surfaces, either.
  • the object of the present invention is to provide a press section that removes, or at least substantially reduces drawbacks of prior art press sections.
  • the principal feature of the invention is that into the press section, through the said press nips formed by open-faced rolls, between the second press felt of the nip and the web, a transfer felt or felts are arranged to considerably support the web in the runs between the nips in order to achieve a closed draw of the web.
  • the said transfer felts are permeable to water and do not absorb considerable quantities of water into themselves.
  • the invention has several advantages of which for example the following can be mentioned.
  • the most important advantage compared to prior art is that in the press section of the invention the draw of the web takes place as a closed draw so that the web is in the press section supported by the transfer felt. Because of this the press section can be run at a higher speed than previously known press sections.
  • Another considerable advantage is that in accordance with the invention dewatering is achieved on both surfaces in all press nips and that rewetting of the web can be prevented almost completely, because the web can be detached from the press felts by means of the transfer felts immediately after the nip.
  • the web W is formed on wire 10, which is either a Fourdrinier wire or a supporting wire of a two-wire forming section.
  • wire 10 is either a Fourdrinier wire or a supporting wire of a two-wire forming section.
  • the web W is transferred in the detaching point P1 in the suction zone 23 of the pick-up roll 22 onto the first top felt 20, which thus functions also as a pick-up felt.
  • the first top felt 20 carries the web W on its bottom side into the first nip press N1, which is formed between two press rolls, namely between the first top roll 21 and first bottom roll 31.
  • the first top felt 20 forms an endless loop by means of felt rolls and guide rolls 24, which also keep the said felt 20 appropriately tight.
  • the first nip N1 is provided with two press felts, namely with the said first top felt 20 and with the first bottom felt 30, which also forms an endless loop by means of felt rolls and guide rolls 32. These rolls also keep the first bottom felt 30 appropriately tight.
  • the press rolls 21 and 31 of the first press nip N1 are open-­faced press rolls, as illustrated in FIGS. 1 - 3 with a broken line. In FIG. 4 the said open faces are denoted by reference numerals 21a and 31a.
  • the first press nip N1 is followed in the direction of the web W by a second separate press nip N2, which is formed between two press rolls, namely between the second top roll 41 and the second bottom roll 51.
  • the second press nip N2 is also provided with two press felts, namely with the second top felt 40 and the second bottom felt 50.
  • the second top felt 40 forms an endless loop by means of felt rolls and guide rolls 42 which also take care of tightening the second top felt 40.
  • the second bottom felt 50 is formed into an endless loop by means of felt rolls and guide rolls 52, which keep the second bottom felt 50 appro­priately tight.
  • the press rolls 41 and 51 of the second press nip N2 are also open-faced press rolls.
  • the second press nip N2 is followed in the direction of the web W by a third separate press nip N3.
  • the third press nip N3, mentioned in the embodiments of FIGS. 1 and 2 is formed between two press rolls, namely between the third top roll 61 and the third bottom roll 71.
  • the press rolls 61 and 71 are open-­faced.
  • the third press nip N3 is provided, in the same manner as press nips N1 and N2 described above, with two press felts, namely with the third top felt 60 and the third bottom felt 70.
  • FIG. 3 differs from FIGS. 1 and 2 in the respect that in the embodiment of FIG. 3 the third press nip N3 is provided with only one press felt, namely with the third bottom felt 70, which is formed into an endless loop in the same manner as in FIGS. 1 and 2 by means of felt rolls and guide rolls 72.
  • the third bottom roll 71 can also be a similar open-faced press roll as described in the previous embodiments.
  • the third top roll 61a in the embodiment of FIG. 3 is a smooth-faced press roll.
  • a transfer felt 1 which is formed into an endless loop by means of felt, guide, and stretcher rolls 2.
  • the said transfer felt 1 runs through all press nips N1, N2 and N3 of the press section.
  • the transfer felt is made of material that is permeable to water, but that does absorb considerable quantities of water into itself.
  • the transfer felt 1 can be for example of single-layer thin wire felt, although some other materials and implementations can be used.
  • the web W is thus supported by the transfer felt 1 all the way when the web runs through the press section.
  • the said transfer felt is 1 arranged to run between the bottom felts 30, 50, 70 and the web W, but naturally the transfer felt 1 can be arranged to run between the top felts 20, 40, 60 and the web W.
  • the steam boxes are denoted by reference numerals 3, 4 and 5.
  • the first steam box 3 is situated inside the first top felt loop 20
  • the second steam box 4 is situated on the run between the first press nip N1 and the second press nip N2
  • the third steam box 5 is situated on the run between the second press nip N2 and the third press nip N3.
  • FIG. 4 illustrates, there is vacuum after the nips in the gap G between the felt 30 and the transfer felt 1 due to air vortex.
  • FIG. 1 illustrates schematically that after each nip N1, N2 and N3 a said blow suction box has been situated in the gap G between the transfer felt 1 and the corresponding felts 30, 50 and 70.
  • the said blow suction boxes are denoted by reference numerals 6, 7 and 8.
  • the web W is shifted in the detaching point P2 onto the drying wire 80 by means of transfer roll 81, and the drying wire 80 shifts the web W onto the drying cylinders, of which drying cylinders the first is denoted by reference numeral 82.
  • FIG. 2 differs from the embodiment of FIG. 1 in that in the embodiment of FIG. 2 there is an own transfer felt for each press.
  • a first transfer felt 101 running through the first press nip N1.
  • the said first transfer felt 101 is formed into an endless loop by means of felt, guide and stretcher rolls 102.
  • steam box 3 situated inside the top felt loop 20 to heat the web W, and there is blow suction box 6 situated in the gap G after the first nip N1 between the first bottom felt 30 and the first transfer felt 101 in the same manner as in FIG. 1.
  • the second press there is a second transfer felt 201 between the web W and the second bottom felt 50.
  • the said second transfer felt 201 is formed into an endless loop by means of felt, guide and stretcher rolls 202.
  • in the third press there is a third transfer felt 301, which is formed into an endless loop by means of felt, guide and stretcher rolls 302.
  • blow suction box 8 situated in the gap after the third nip N3 between the third transfer felt 301 and bottom felt 70.
  • steam box 9 situated below the transfer felt 301. The steam box 9 blows steam through the said transfer felt 301 to the web W in order to heat the web.
  • the web W is shifted in the detaching point P2 onto the drying wire 80 by means of transfer roll 81. and the drying wire 80 shifts the web W onto the first drying cylinder 82 of the dryer section.
  • the closed draw of the web is achieved so that the web W is fetched from the transfer felt of the previous press by means of the top felt of the next press.
  • the first transfer felt 101 reaches to the region of the second top felt 40, and correspondingly the second transfer felt 201 reaches to the region of the third top felt 60.
  • the advantage of the embodiment of FIG. 2 in comparison with FIG. 1 is that by using separate transfer felts 101, 201 and 301 it is possible to avoid the problems, which may be caused by speed differences between presses.
  • the embodiment of FIG. 2 can also be carried out so that the transfer felts 101, 201 and 301 are situated in a way different from FIG. 2, namely between the web W and the top felts 20, 40 and 60.
  • Other qualities and material of the transfer felts 101, 201 and 301 can be the same as of the transfer felt 1 described in FIG. 1.
  • the embodiment of FIG. 3 is exactly similar to the embodiment of FIG. 2. For this part reference is thus made to the above description. Instead, in the embodiment of FIG. 3, in the third press it is not used a similar transfer felt as in the first and second presses. As described above, in this embodiment the third nip N3 is formed between an open-faced bottom roll 71 and a smooth-faced press roll 61a. The press felt 70 is taken over the open-­faced bottom roll 71 alone, and the said bottom felt 70 is formed into an endless loop by means of felt rolls and guide rolls 72. In the embodiment of FIG.
  • the draw of the web is thus not closed in the whole press section, but instead there is an open draw in point P3 between the second and third presses as the web W is shifted from the second transfer felt 201 onto the third bottom felt 70.
  • From the third press top roll 61a the web is shifted onto the drying wire 80 by means of transfer rolls 85 and 81, and the drying wire 80 shifts the web W onto the first drying cylinder 82 of the dryer section.
EP19900305355 1989-06-02 1990-05-17 Presspartie für Papier-, Karton- oder Faserbreitrocknungsmaschine Withdrawn EP0400843A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI892705 1989-06-02
FI892705A FI892705A (fi) 1989-06-02 1989-06-02 Pressparti foer en pappers-, kartong- eller cellulosatorkningsmaskin.

Publications (2)

Publication Number Publication Date
EP0400843A2 true EP0400843A2 (de) 1990-12-05
EP0400843A3 EP0400843A3 (de) 1992-01-02

Family

ID=8528558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900305355 Withdrawn EP0400843A3 (de) 1989-06-02 1990-05-17 Presspartie für Papier-, Karton- oder Faserbreitrocknungsmaschine

Country Status (6)

Country Link
EP (1) EP0400843A3 (de)
JP (1) JPH038882A (de)
KR (1) KR910001171A (de)
CN (1) CN1047715A (de)
CA (1) CA2017864A1 (de)
FI (1) FI892705A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302252A (en) * 1991-11-26 1994-04-12 Sulzer-Escher Wyss Gmbh Heated extended nip press with inlet support pocket
DE4331319A1 (de) * 1993-09-15 1995-03-16 Escher Wyss Gmbh Vorrichtung zur Übergabe einer Faserstoffbahn an eine Entwässerungspressenpartie
US5580423A (en) * 1993-12-20 1996-12-03 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5772849A (en) * 1996-04-25 1998-06-30 Voith Sulzer Papiermaschinen Gmbh Press
US5776307A (en) * 1993-12-20 1998-07-07 The Procter & Gamble Company Method of making wet pressed tissue paper with felts having selected permeabilities
US5795440A (en) * 1993-12-20 1998-08-18 The Procter & Gamble Company Method of making wet pressed tissue paper
US5830316A (en) * 1997-05-16 1998-11-03 The Procter & Gamble Company Method of wet pressing tissue paper with three felt layers
US5855739A (en) * 1993-12-20 1999-01-05 The Procter & Gamble Co. Pressed paper web and method of making the same
US5861082A (en) * 1993-12-20 1999-01-19 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5972170A (en) * 1996-10-31 1999-10-26 Voith Sulzer Papiermaschinen Gmbh Suction box
US6103062A (en) * 1998-10-01 2000-08-15 The Procter & Gamble Company Method of wet pressing tissue paper
WO2006068678A1 (en) * 2004-12-21 2006-06-29 Kimberly-Clark Worldwide, Inc. Method and system for producing wet-pressed, molded tissue products
US7601244B2 (en) * 2003-05-13 2009-10-13 Oji Paper Co., Ltd. Press for paper machine with smoothing press, and paper production method

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI955014A (fi) * 1995-10-20 1997-04-21 Valmet Corp Paperikoneen puristinosa, jossa käytetään pitkänippipuristinta
FI116400B (fi) * 2002-11-19 2005-11-15 Metso Paper Inc Paperi- tai kartonkikoneen puristinosa
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
SE538854C2 (sv) 2014-01-09 2017-01-03 Valmet Oy Rullstol för mottagande och upprullning av en pappersbana, som kommer från en torkcylinder i en pappersmaskin, till en rulle, samt en pappersmaskin som använder en rullstol
CN104250944B (zh) * 2014-08-14 2016-09-28 唐山市天正实业有限公司 纱管纸生产系统及相应的纱管纸生产工艺
HUE057727T2 (hu) * 2014-09-15 2022-06-28 Upm Specialty Papers Oy Gyártási eljárás alacsony súlyú, kiváló minõségû papír elõállítására egy leválasztható réteg hordozórétegeként való alkalmazásra egy heveder-összeállítással
CN106192535B (zh) * 2016-07-22 2017-11-14 福建省联盛纸业有限责任公司 一种纸张压榨装置
DE102018119383A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Wellpappenrohpapierbahn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093535A (en) * 1958-07-14 1963-06-11 Stiftelsen Pappersbrukens Fors Method of dewatering pulp webs
US3214330A (en) * 1963-01-24 1965-10-26 Huyck Corp Duplex fabric paper press
US3266976A (en) * 1963-09-12 1966-08-16 Beloit Corp Couch assembly for papermaking machines
US3556940A (en) * 1968-04-08 1971-01-19 Beloit Corp Press assembly
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
DE3742848A1 (de) * 1987-12-17 1989-06-29 Escher Wyss Gmbh Pressenpartie einer papiermaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093535A (en) * 1958-07-14 1963-06-11 Stiftelsen Pappersbrukens Fors Method of dewatering pulp webs
US3214330A (en) * 1963-01-24 1965-10-26 Huyck Corp Duplex fabric paper press
US3266976A (en) * 1963-09-12 1966-08-16 Beloit Corp Couch assembly for papermaking machines
US3556940A (en) * 1968-04-08 1971-01-19 Beloit Corp Press assembly
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
DE3742848A1 (de) * 1987-12-17 1989-06-29 Escher Wyss Gmbh Pressenpartie einer papiermaschine

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5302252A (en) * 1991-11-26 1994-04-12 Sulzer-Escher Wyss Gmbh Heated extended nip press with inlet support pocket
DE4331319A1 (de) * 1993-09-15 1995-03-16 Escher Wyss Gmbh Vorrichtung zur Übergabe einer Faserstoffbahn an eine Entwässerungspressenpartie
US5861082A (en) * 1993-12-20 1999-01-19 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5580423A (en) * 1993-12-20 1996-12-03 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5637194A (en) * 1993-12-20 1997-06-10 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5776307A (en) * 1993-12-20 1998-07-07 The Procter & Gamble Company Method of making wet pressed tissue paper with felts having selected permeabilities
US5795440A (en) * 1993-12-20 1998-08-18 The Procter & Gamble Company Method of making wet pressed tissue paper
US5904811A (en) * 1993-12-20 1999-05-18 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5846379A (en) * 1993-12-20 1998-12-08 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5855739A (en) * 1993-12-20 1999-01-05 The Procter & Gamble Co. Pressed paper web and method of making the same
US5772849A (en) * 1996-04-25 1998-06-30 Voith Sulzer Papiermaschinen Gmbh Press
US5972170A (en) * 1996-10-31 1999-10-26 Voith Sulzer Papiermaschinen Gmbh Suction box
US5830316A (en) * 1997-05-16 1998-11-03 The Procter & Gamble Company Method of wet pressing tissue paper with three felt layers
US6051105A (en) * 1997-05-16 2000-04-18 The Procter & Gamble Company Method of wet pressing tissue paper with three felt layers
US6103062A (en) * 1998-10-01 2000-08-15 The Procter & Gamble Company Method of wet pressing tissue paper
US7601244B2 (en) * 2003-05-13 2009-10-13 Oji Paper Co., Ltd. Press for paper machine with smoothing press, and paper production method
WO2006068678A1 (en) * 2004-12-21 2006-06-29 Kimberly-Clark Worldwide, Inc. Method and system for producing wet-pressed, molded tissue products
US7462257B2 (en) 2004-12-21 2008-12-09 Kimberly-Clark Worldwide, Inc. Method for producing wet-pressed, molded tissue products
KR101179861B1 (ko) 2004-12-21 2012-09-04 킴벌리-클라크 월드와이드, 인크. 습식 프레싱되고 성형된 티슈 제품의 제조 방법 및 시스템

Also Published As

Publication number Publication date
CN1047715A (zh) 1990-12-12
CA2017864A1 (en) 1990-12-02
EP0400843A3 (de) 1992-01-02
FI892705A (fi) 1990-12-03
FI892705A0 (fi) 1989-06-02
KR910001171A (ko) 1991-01-30
JPH038882A (ja) 1991-01-16

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