EP0584492A1 - Machine à papier avec un système d'enfilage dans la section de presse - Google Patents

Machine à papier avec un système d'enfilage dans la section de presse Download PDF

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Publication number
EP0584492A1
EP0584492A1 EP93110451A EP93110451A EP0584492A1 EP 0584492 A1 EP0584492 A1 EP 0584492A1 EP 93110451 A EP93110451 A EP 93110451A EP 93110451 A EP93110451 A EP 93110451A EP 0584492 A1 EP0584492 A1 EP 0584492A1
Authority
EP
European Patent Office
Prior art keywords
tail
roll
paper
threading
press
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
EP93110451A
Other languages
German (de)
English (en)
Other versions
EP0584492B1 (fr
Inventor
Takashi Mihara Machinery Works Bando
Hidemasa Mihara Machinery Works Iijima
Norio Mihara Machinery Works Fujita
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0584492A1 publication Critical patent/EP0584492A1/fr
Application granted granted Critical
Publication of EP0584492B1 publication Critical patent/EP0584492B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the present invention relates to a paper threading system applicable to a press part of a paper machine.
  • FIG. 4 One example of a press part paper threading system in a heretofore known paper machine is illustrated in Fig. 4.
  • a net paper web transferred from a wire part to a press part with the aid of a suction pick-up roll 4 passes through a No. 1 press, a No. 2 press and a No. 3 press to be dewatered by the respective presses, and then it is scraped out by means of a center roll doctor 6 and falls in a broke pit for a press (not shown).
  • the wet paper web is slitted at the positions of a tail width by means of paper cutting nozzles 2 set at the positions for making a paper threading tail on the wire part, and it is threaded up to a center roll 5 as a sheet trimmed by trimming nozzles 1.
  • the tail is blown by means of an air-jet nozzle (not shown) towards a nip portion where a transfer felt 16 engaged with a No. 1 suction transfer roll 7 and a 4P bottom felt come into contact with each other to be transferred to the nip portion, then the tail advances into a nip portion of a No. 4 press, then it is scraped out by a doctor 10 for a 4P top roll and is taken out to the outside by means of a broke conveyor 11 for the 4P top roll.
  • the tail is threaded up to a No. 1 dryer by means of an air-jet nozzle (not shown), then it is transferred to a dryer part as caught in a carrier rope of a dryer not show, and threading of the tail to the dryer is completed. Thereafter, spreading of a paper web is effected by traversing the paper cutting nozzle 2, and threading of a wet paper web over its entire width is completed.
  • An outline of the condition of slitting by means of the paper cutting nozzle 2 and the condition of trimming by means of the trimming nozzles 1 in the above-described case is shown in Fig. 5.
  • the heretofore known press part paper threading system had shortcomings that since an open draw is formed between the center roll 5 and the No. 1 suction transfer roll 7 and between the 4P top roll 9 and the No. 2 suction transfer roll 8 during operation, a sheet tension (a draw value between the presses) for stretching the wet paper sheet is applied, a longitudinal-to-lateral ratio of a product paper strength becomes large, and the quality is degraded, and that for the purpose of broke processing at the time of paper threading, the 4P top roll 9 necessitated a paper scraping doctor and a broke processing apparatus.
  • Another object of the present invention is to provide a press part paper threading system in a paper machine, wherein at the time of paper threading, wet paper would not enter a press nip in a coagulated form, and so, damage of a felt nor damage of a roll coating caused by an excessively large nip pressure would not occur.
  • a press part paper threading system in a paper machine which comprises at least one set of, that is, one or more sets of suction transfer rolls having an inner vacuum zone divided into a tail zone and a total-width zone, capable of switching the same vacuum zones, and capable of pressing with a low nip pressure against a press roll and releasing the pressing, and a tail cutting device for cutting a tail for threading, in the widthwise direction.
  • the above-featured press part paper threading system in a paper machine which further comprises an air-jet nozzle for assisting to scrape out a paper web from a center roll and a top roll.
  • a wet paper web transferred to a press part by a suction pick-up roll is scraped out over its entire width by means of a doctor for a center roll.
  • vacuum is exerted upon the vacuum zone corresponding to a tail width.
  • cutting of a tail is effected by actuating a tail cutting nozzle in a wire part.
  • the tip end of the tail cut by the tail cutting nozzle passes through a nip portion of the No. 1 suction transfer roll, the tail would be transferred to the side of a transfer felt by its vacuum force and would enter a nip portion of the No. 4 press.
  • an air-jet could be blown towards the tip end of the tail cut in the widthwise direction to assist the transfer to the side of the transfer felt.
  • the tip end of the tail having passed the nip portion of the No. 4 press can be smoothly transferred to the side of a dryer canvas by a vacuum force when it passes the nip of the No. 2 suction transfer roll similarly to the No. 1 suction transfer roll.
  • a vacuum force when it passes the nip of the No. 2 suction transfer roll similarly to the No. 1 suction transfer roll.
  • a tail width is broadened by moving the paper cutting nozzle on the wire part, and a wet paper web having a total width is threaded.
  • the vacuum zones of the respective suction transfer rolls are switched to a total-width zone, and automatic paper threading through a press part is completed.
  • the nip widths formed by the No. 1 and No. 2 suction transfer rolls, the center roll and the top roll are short, the case where transfer to the transfer rolls is difficult, is expected.
  • a paper threading operation is carried out automatically in a simple manner, and hence, even an operator having a little experience and skill in the technique can easily achieve the paper threading operation.
  • a longitudinal-to-lateral ratio of a paper strength becomes small, paper quality is improved, breaking of a paper web in the press part is minimized, hence a stable operation at a high speed is possible, and therefore, a productivity can be raised by improving an operation efficiency of a paper machine.
  • Figs. 1 to 3 show the preferred embodiments of the present invention.
  • trimming nozzles 1 for determining a paper web width
  • a paper cutting nozzle 2 for making a tail at the time of threading a paper web
  • a tail cutting nozzle 3 having a swing arm 3a for cutting a tail in the widthwise direction in the press part.
  • a wet paper web on the wire part is transferred to a total-width press part by means of a suction pick-up roll 4, a wet paper web dewatered respectively through a No. 1 press, a No. 2 press and a No. 3 press is scraped out over its entire width by means of a center roll doctor 6 provided on a center roll (press roll) 5, and is led into a broke pulper (not shown) by means of a broke shoot.
  • the wet paper web is carried up to the center roll in the form of a sheet having slitted at the positions of a tail width by means of paper cutting nozzles 2 and trimmed by means of trimming nozzles 1 as shown in Fig. 2.
  • the tail When the tail has passed a nip portion of a No. 4 press, it is caught by the 4P top roll 9 and passes the nip between the roll 9 and the No. 2 suction transfer roll 8'. At this moment, similarly to the No. 1 suction transfer roll 7', the tip end of the tail is transferred to a No. 2 suction transfer roll 8' by a vacuum action upon the tail portion, and is threaded through a dryer part. At this time, an air-jet nozzle 15 could be used for assisting the transfer of the tail to the No. 2 suction transfer roll 8'.
  • a 4P top roll doctor 10 is used with a relatively low nip pressure for removing paper dregs or the like adhered to the 4P top roll.
  • Fig. 3 shows another preferred embodiment, in which transfer of a tail in the transfer roll portion can be achieved more reliably.
  • a center roll blanket 12 and a 4P top roll blanket 13 are wound respectively around the center roll 5 and around the 4P top roll 9, and by making these blanket somewhat overlap respectively with the No. 1 suction transfer roll 7' and the No. 2 suction transfer roll 8', the sheet transfer at these portions is made to be reliable.
  • the respective transfer suction rolls 7' and 8' are not pressed lightly against the center roll 5 nor against the 4P top roll 9, and so, a wet paper web can be transferred from the blankets 12 and 13 without forming an open draw.
  • the center roll doctor 6 is not provided, but a wet paper web before threading would travel jointly with the center roll blanket 12, and it could be made to fall into a broke pulper or paper threading for a tail portion could be effected in a similar manner to the above-described first preferred embodiment.
  • the tail cutting device could be disposed either in a wire part or in a press part, and the cutting means could not be a water jet but could be any other means.

Landscapes

  • Paper (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
EP93110451A 1992-07-28 1993-06-30 Machine à papier avec un système d'enfilage dans la section de presse Expired - Lifetime EP0584492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP219650/92 1992-07-28
JP04219650A JP3140571B2 (ja) 1992-07-28 1992-07-28 プレスパート通紙装置

Publications (2)

Publication Number Publication Date
EP0584492A1 true EP0584492A1 (fr) 1994-03-02
EP0584492B1 EP0584492B1 (fr) 1996-09-04

Family

ID=16738842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110451A Expired - Lifetime EP0584492B1 (fr) 1992-07-28 1993-06-30 Machine à papier avec un système d'enfilage dans la section de presse

Country Status (5)

Country Link
EP (1) EP0584492B1 (fr)
JP (1) JP3140571B2 (fr)
KR (1) KR970003579B1 (fr)
DE (1) DE69304469T2 (fr)
FI (1) FI108466B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440948A1 (de) * 1994-11-17 1996-05-23 Voith Gmbh J M Verfahren zum Aufführen einer Papierbahn in eine Papiermaschine, Naßpartie einer Papiermaschine sowie Saugwalze für eine Papiermaschine
WO1998032919A1 (fr) * 1997-01-27 1998-07-30 Beloit Technologies, Inc. Systeme d'engagement de la pointe du papier pour machine de fabrication du papier
DE19724219A1 (de) * 1997-06-09 1998-12-10 Voith Sulzer Papiermasch Gmbh Pressenpartie
WO2001048309A1 (fr) * 1999-12-27 2001-07-05 Valmet Corporation Procede et dispositif pour devier temporairement une bande de papier ou de carton
WO2002035001A1 (fr) * 2000-10-27 2002-05-02 Metso Paper, Inc. Procede et appareil d'engagement de bande dans une section de sechage d'une machine a papier ou analogue
WO2002088463A1 (fr) * 2001-04-26 2002-11-07 Andritz Technology And Asset Management Gmbh Procede et dispositif permettant de transferer une pointe dans une installation de sechage de materiaux en bande
JP2021025167A (ja) * 2019-08-06 2021-02-22 東芝三菱電機産業システム株式会社 抄紙機および抄紙機に用いられる制御装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI104644B (fi) * 1998-08-17 2000-03-15 Valmet Corp Menetelmä ja laite paperikoneella rainan siirtämiseksi formeriosalta puristinosalle
US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine
FI117015B (fi) * 2001-06-05 2006-05-15 Metso Paper Inc Laitteisto ja menetelmä terän vaihtamiseksi
JP5616013B2 (ja) * 2007-11-08 2014-10-29 日本製紙株式会社 抄紙機のドライパートへの通紙方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5037509A (en) * 1990-10-29 1991-08-06 Beloit Corporation Apparatus for transferring a threading tail of a web
DE9011461U1 (fr) * 1990-08-07 1991-09-05 J.M. Voith Gmbh, 7920 Heidenheim, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9011461U1 (fr) * 1990-08-07 1991-09-05 J.M. Voith Gmbh, 7920 Heidenheim, De
US5037509A (en) * 1990-10-29 1991-08-06 Beloit Corporation Apparatus for transferring a threading tail of a web

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440948A1 (de) * 1994-11-17 1996-05-23 Voith Gmbh J M Verfahren zum Aufführen einer Papierbahn in eine Papiermaschine, Naßpartie einer Papiermaschine sowie Saugwalze für eine Papiermaschine
WO1998032919A1 (fr) * 1997-01-27 1998-07-30 Beloit Technologies, Inc. Systeme d'engagement de la pointe du papier pour machine de fabrication du papier
DE19724219A1 (de) * 1997-06-09 1998-12-10 Voith Sulzer Papiermasch Gmbh Pressenpartie
WO2001048309A1 (fr) * 1999-12-27 2001-07-05 Valmet Corporation Procede et dispositif pour devier temporairement une bande de papier ou de carton
WO2002035001A1 (fr) * 2000-10-27 2002-05-02 Metso Paper, Inc. Procede et appareil d'engagement de bande dans une section de sechage d'une machine a papier ou analogue
US6916404B2 (en) 2000-10-27 2005-07-12 Metso Paper, Inc. Method and apparatus for web threading in a drying section of a paper machine or similar
WO2002088463A1 (fr) * 2001-04-26 2002-11-07 Andritz Technology And Asset Management Gmbh Procede et dispositif permettant de transferer une pointe dans une installation de sechage de materiaux en bande
JP2021025167A (ja) * 2019-08-06 2021-02-22 東芝三菱電機産業システム株式会社 抄紙機および抄紙機に用いられる制御装置

Also Published As

Publication number Publication date
KR970003579B1 (ko) 1997-03-20
JP3140571B2 (ja) 2001-03-05
FI933038A (fi) 1994-01-29
JPH0657680A (ja) 1994-03-01
KR940005855A (ko) 1994-03-22
FI933038A0 (fi) 1993-07-01
EP0584492B1 (fr) 1996-09-04
FI108466B (fi) 2002-01-31
DE69304469T2 (de) 1997-02-20
DE69304469D1 (de) 1996-10-10

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