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 PDFInfo
- 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
Links
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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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04219650A JP3140571B2 (ja) | 1992-07-28 | 1992-07-28 | プレスパート通紙装置 |
JP219650/92 | 1992-07-28 |
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)
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)
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)
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 |
-
1992
- 1992-07-28 JP JP04219650A patent/JP3140571B2/ja not_active Expired - Fee Related
-
1993
- 1993-06-30 DE DE69304469T patent/DE69304469T2/de not_active Expired - Lifetime
- 1993-06-30 EP EP93110451A patent/EP0584492B1/fr not_active Expired - Lifetime
- 1993-07-01 FI FI933038A patent/FI108466B/fi active
- 1993-07-27 KR KR1019930014278A patent/KR970003579B1/ko not_active IP Right Cessation
Patent Citations (2)
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)
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 |
DE69304469D1 (de) | 1996-10-10 |
EP0584492B1 (fr) | 1996-09-04 |
JP3140571B2 (ja) | 2001-03-05 |
KR940005855A (ko) | 1994-03-22 |
DE69304469T2 (de) | 1997-02-20 |
FI933038A (fi) | 1994-01-29 |
JPH0657680A (ja) | 1994-03-01 |
FI933038A0 (fi) | 1993-07-01 |
FI108466B (fi) | 2002-01-31 |
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