EP0584492B1 - Papermaking machine with a press part paper threading system - Google Patents

Papermaking machine with a press part paper threading system Download PDF

Info

Publication number
EP0584492B1
EP0584492B1 EP93110451A EP93110451A EP0584492B1 EP 0584492 B1 EP0584492 B1 EP 0584492B1 EP 93110451 A EP93110451 A EP 93110451A EP 93110451 A EP93110451 A EP 93110451A EP 0584492 B1 EP0584492 B1 EP 0584492B1
Authority
EP
European Patent Office
Prior art keywords
roll
paper web
tail
paper
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.)
Expired - Lifetime
Application number
EP93110451A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0584492A1 (en
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/en
Application granted granted Critical
Publication of EP0584492B1 publication Critical patent/EP0584492B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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-making machine with a paper threading system applicable to a press part of the 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 18 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 shown, 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.
  • US-A 5 037 509 An apparatus for transferring a threading tail of a web from a press section to a dryer section of a paper making machine is disclosed in US-A 5 037 509.
  • This known device comprises a cutting device which cuts the paper web in a longitudinal direction on or upstream of the press roll in order to form a longitudinal strip having a smaller width than the paper web.
  • the tail cutting means can move in a cross-machine direction for initially cutting the threading tail to be a narrow wedge.
  • the tail of the paper web is used to facilitate pickup of the paper web from the press roll by means of a suction transfer roll having a divided interior vacuum space including a tail zone at an axial end of the suction transfer roll.
  • the width of the tail is gradually increased to the total width of the paper web by gradually moving the longitudinal cutting device in the cross-machine direction.
  • Another aspect of the present invention is to provide a paper-making machine with a press part paper threading system, 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 or damage of a roll coating caused by an excessively large nip pressure would not occur.
  • a paper-making machine with a threading system for threading a paper web from a press roll of a press part of the machine comprising: cutting nozzle means for cutting a longitudinally-extending slit in the paper web at a side thereof to form a tail in the paper web located between the slit and one lateral side edge of the paper web, the tail being narrower than the portion of the paper web between said slit and the other lateral side edge of the paper web, a blanket loop running over the press roll, a suction transfer roll cooperating with the blanket loop so as to transfer the paper web from the blanket, said suction transfer roll being supported in the press part so as to be capable of moving toward the blanket and lightly pressing against the blanket to achieve a partial overlap of the blanket on the suction transfer roll in order to elongate a nip formed therebetween and of releasing the pressing, and said suction transfer roll having a divided interior vacuum space including a tail zone at an axial end of the suction transfer roll such
  • 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. At this moment, 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.
  • blankets are arranged around the center roll and around the top roll and the blankets are somewhat overlapped with the suction transfer rolls, then nip widths where vacuum acts would be elongated, and it becomes possible to reliably carry out sheet transfer.
  • the doctor for the center roll is not used, but the total-width sheet is made to fall in a broke pit for a press.
  • the top roll also reliably transfers the tail by means of the blanket.
  • 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 17.
  • 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 pape 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 Papermaking machine with a press part paper threading system Expired - Lifetime EP0584492B1 (en)

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 EP0584492A1 (en) 1994-03-02
EP0584492B1 true EP0584492B1 (en) 1996-09-04

Family

ID=16738842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110451A Expired - Lifetime EP0584492B1 (en) 1992-07-28 1993-06-30 Papermaking machine with a press part paper threading system

Country Status (5)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine
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

Families Citing this family (9)

* 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
US5762759A (en) * 1997-01-27 1998-06-09 Beloit Technologies, Inc. Tail threading system for a papermaking machine
DE19724219A1 (de) * 1997-06-09 1998-12-10 Voith Sulzer Papiermasch Gmbh Pressenpartie
FI104644B (fi) * 1998-08-17 2000-03-15 Valmet Corp Menetelmä ja laite paperikoneella rainan siirtämiseksi formeriosalta puristinosalle
DE19963285A1 (de) * 1999-12-27 2001-06-28 Valmet Corp Vorrichtung und Verfahren zur zeitweiligen Ableiten einer Bahn aus Papier oder Pappe
SE518970C2 (sv) * 2001-04-26 2002-12-10 Flaekt Ab Förfarande och anordning vid spetsdragning av ett banformigt material
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
JP7187402B2 (ja) * 2019-08-06 2022-12-12 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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9011461U1 (de) * 1990-08-07 1991-09-05 J.M. Voith Gmbh, 7920 Heidenheim Umlenkwalze zur Verwendung vorzugsweise in einer Ein-Sieb-Trockengruppe
US5037509A (en) * 1990-10-29 1991-08-06 Beloit Corporation Apparatus for transferring a threading tail of a web

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine
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

Also Published As

Publication number Publication date
KR940005855A (ko) 1994-03-22
JP3140571B2 (ja) 2001-03-05
JPH0657680A (ja) 1994-03-01
FI108466B (fi) 2002-01-31
FI933038A0 (fi) 1993-07-01
FI933038A (fi) 1994-01-29
DE69304469D1 (de) 1996-10-10
KR970003579B1 (ko) 1997-03-20
DE69304469T2 (de) 1997-02-20
EP0584492A1 (en) 1994-03-02

Similar Documents

Publication Publication Date Title
US5762759A (en) Tail threading system for a papermaking machine
EP0584492B1 (en) Papermaking machine with a press part paper threading system
JPH07113196B2 (ja) ウエブの紙通しテールを移送する装置
JPH02104794A (ja) 紙料から紙ウエブを製造する装置及び方法
JP2589259B2 (ja) 乾燥紙ウエブの製造装置
US4874470A (en) Papermaking press section and transfer arrangement to dryer section
US4236962A (en) Method and apparatus for separating a web from a former wire and transferring the web to a press felt
FI104644B (fi) Menetelmä ja laite paperikoneella rainan siirtämiseksi formeriosalta puristinosalle
JPH0299685A (ja) 通紙される紙匹の移送方法及び装置
US6336996B1 (en) Process and device for the transfer of a fibrous material web
US2686463A (en) Automatic deckle edge separating press roll section
EP0364114B1 (en) Wet cellulosic web transfer
EP1122361B1 (en) Transfer of a lead strip of a paper web
US2732772A (en) Hornbostel
EP0131123B1 (en) Method and apparatus for reducing the energy consumption when drying a paper web
US4081320A (en) Method and apparatus for separating a fibrous web from a foraminous belt
CA2433708C (en) Method and equipment for tail threading in the dryer section of a paper machine or a similar machine
KR100257276B1 (ko) 제지기
US5124000A (en) Method of and an arrangement for passing a fibre web from a wire through a press section
JP2000256982A (ja) 抄紙機におけるテール紙の通紙方法とその装置
US20030183353A1 (en) Press section tail threading
JP3188115B2 (ja) 抄紙機のプレス装置
US11946203B2 (en) Device and method for transferring a strip of a web
JP5616013B2 (ja) 抄紙機のドライパートへの通紙方法
CA2158728A1 (en) Traction-free web transport in a compression section

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930727

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

17Q First examination report despatched

Effective date: 19941207

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT

REF Corresponds to:

Ref document number: 69304469

Country of ref document: DE

Date of ref document: 19961010

ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20080620

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20100621

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20100625

Year of fee payment: 18

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110630

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69304469

Country of ref document: DE

Effective date: 20120103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120103