EP0479748A1 - Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn - Google Patents

Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn Download PDF

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Publication number
EP0479748A1
EP0479748A1 EP91850239A EP91850239A EP0479748A1 EP 0479748 A1 EP0479748 A1 EP 0479748A1 EP 91850239 A EP91850239 A EP 91850239A EP 91850239 A EP91850239 A EP 91850239A EP 0479748 A1 EP0479748 A1 EP 0479748A1
Authority
EP
European Patent Office
Prior art keywords
leader
doctor
blowings
drying
wire
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
EP91850239A
Other languages
English (en)
French (fr)
Other versions
EP0479748B1 (de
Inventor
Heikki Ilvespää
Antti Kuhasalo
Jouko Yli-Kauppila
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 Oy
Original Assignee
Valmet Paper Machinery Inc
Valmet Oy
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 Paper Machinery Inc, Valmet Oy filed Critical Valmet Paper Machinery Inc
Publication of EP0479748A1 publication Critical patent/EP0479748A1/de
Application granted granted Critical
Publication of EP0479748B1 publication Critical patent/EP0479748B1/de
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
    • 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
    • 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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention concerns a method in a multi-cylinder dryer of a paper machine in the threading of the paper web, said threading taking place substantially without a system of threading ropes, in which method the web is passed along a meandering path, in twin-wire draw, over drying cylinders and, in single-wire draw, on a drying wire, over drying cylinders and leading suction cylinders or rolls.
  • the invention concerns a device for carrying out the method.
  • the threading involves the drawback that the leader tends to follow the smooth face of the drying cylinder in stead of the drying wire as the wire runs from the drying cylinder to the following leading suction cylinder or roll.
  • arrangements of air nozzles have been employed, of which nozzle arrangements one has been fitted before each leading suction cylinder and through which nozzle arrangements air jets are blown to guide the run of the leader.
  • attempts are made to make sure that the leader remains on the drying wire. After the leader has reached the suction zone on the leading cylinder, the leader is transferred on the wire onto the next drying cylinder.
  • blow devices placed after the drying section are described, by whose means the leader is guided.
  • the principal object of the present invention is to provide novel solutions for the problems discussed above so that said drawbacks are largely avoided.
  • the method of the invention is mainly characterized in that, in the method, the leader is guided by means of air blowings extending across a substantial proportion or the whole of its width, that said air blowings are applied from the doctor beam to the area of the tip of its doctor blade at a certain small angle in relation to the plane of the doctor blade.
  • the device in accordance with the invention is mainly characterized in that the blow device is integrated in connection with the doctor beams of the drying cylinders, that the blow device comprises a transverse nozzle pipe or an equivalent nozzle arrangement placed at the level of the leader at the proximity of the end of the doctor beam at the driving side of the machine, said nozzle pipe or equivalent comprising a number of nozzle openings placed side by side or an equivalent nozzle slot, and that the blow direction of said nozzles is directed at a certain small angle in relation to the plane of the blade of said doctor in the area of the tip of the blade operating against the face of the drying cylinder.
  • the invention can be applied both in drying cylinder groups provided with single-wire draw and in cylinder groups provided with twin-wire draw, if necessary, over the entire length of the drying section.
  • the invention In connection with single-wire draw, the invention is suitable for use both in normal groups and in inverted groups. According to the present-day knowledge, the invention is most advantageously applicable in connection with single-wire draw.
  • the blowings when the air jets are directed expressly at the area of the tip of the doctor blade at a suitable small angle in relation to the plane of the blade, the blowings can be deflected along the cylinder face that precedes the blade so that the effect of the blowing extends into the opening nip. In this way the blowings obtain a sufficient support and transfer effect on the leader.
  • a sufficiently high energy must be used to provide a reliable transfer and support effect.
  • the drying wire 11 of the single-wire draw runs meandering in contact with the drying cylinders 10 and the leading cylinders 20 so that, on the drying cylinders 10, the web to be dried enters into direct contact with the heated smooth faces of the cylinders 10 and, on the leading cylinder 20, the web is placed at the side of the outside curve on the outer face of the wire 11, where it is held by negative pressure acting from the interior of the cylinder 20 through the perforations and grooves (not shown) in its mantle.
  • a blow box 15 is provided, for example a device marketed by the applicant with the trade mark "UNO RUN BLOW BOX", by means of which formation of a detrimentally high negative pressure in the pressurized nip N+ is prevented and a suitable negative pressure is maintained at the side of the wire 11, which negative pressure guarantees that the web remains on the face of the wire 11 on said straight runs.
  • doctors operate against the free lower sector of the cylinders 10, which doctors comprise a doctor beam 12 and a doctor blade 14, which is attached to said beam by means of a holder 13 and doctors and keeps the smooth faces of the cylinders 10 clean.
  • doctors are fitted above the cylinders 10' against their free sectors.
  • the doctors 12,13,14 are provided with blow devices, by whose means blowings F 1 are directed against the tip portions of the doctor blades 14, from which the blowings bounce and are "reflected" in the direction F 2 towards the opening nip N-.
  • blow devices by whose means blowings F 1 are directed against the tip portions of the doctor blades 14, from which the blowings bounce and are "reflected" in the direction F 2 towards the opening nip N-.
  • Fig. 1 the end of the leader S is denoted with the reference So, which represents the situation in which the end So is transferred on the suction sector of the leading suction cylinder 20 to the next cylinder 10.
  • Figs. 2, and 4 show an embodiment of the device in more detail.
  • an air distribution pipe 22 has been attached to the side of the doctor beam 12, one end of said pipe 22 being a closed end 22, whereas the other end communicates with the blow-air supply duct 24.
  • the blow pipe 22 is provided with a number of nozzle holes 23 across the width L 2 .
  • the blow pipe is arched to its place by means of flanges 25 and 26.
  • the air jets F 1 can be directed at the area of the tip of the doctor blade 14 so that the air jets bounce and are "reflected" from the plane of the doctor blade and are deflected in a direction parallel to the outer face of the cylinder 10, being directed in the direction F 2 at the opening nip N-.
  • a sufficiently high transfer and support effect is produced for the blowings F l , said effect being applied to the leader.
  • the energy of the blowings F 1 must be high enough to achieve said objectives.
  • doctor beams 12 are attached by their ends, by means of axle journals 16, in connection with their pivoting and loading means (not shown).
  • the width of the leader S is denoted with the reference L 1 .
  • the extension L 2 of the blowings F 1 in the transverse direction is of the same order (width L 2 ) as the width L 1 of the leader S. Air from the blowings F 1 is guided along the face of the cylinder 10 in the direction of the arrow F 2 into the opening nip N-. In this way, it is achieved by means of the blowings F 1 ,F 2 . that the leader S is pressed against the wire 11, in which position the suction effect of the blow box 15 keeps the leader S.
  • the blowings F 1 at this cylinder 10 are controlled to make them operative, whereby, owing to the direction of the blowings F i , they detach the leader from the doctor blade 14 and guide the leader S onto the support of the wire 11 placed facing it, which wire carries the leader S over the suction zone of the leading suction cylinder 20 onto the next cylinder 10.
  • Fig. 2 illustrates parameters significant in the dimensioning and alignment of the device in accordance with the invention.
  • the width L 1 of the leader is about 200 mm
  • the width L 2 of the blowings in the transverse direction is typically about 200...350 mm.
  • blow pipe 22 it is possible to use a perforated pipe, in which the diameter of the nozzle holes is typically 3...4 mm and the spacing 30...50 mm.
  • the blow width L 2 may be narrower than the width L 1 of the leader, but, as a rule, the blow width L 2 should preferably not be very much larger than the width L 1 of the leader. For example, with blowings F 1 extending across a width of about 300 mm it is possible to guide a leader S even as wide as about 600 mm, but, as a rule, the width proportions cannot be reversed.
  • Fig. 5 shows the use of the blowings in an inverted cylinder group provided with single-wire draw, wherein the drying cylinders 10' are placed in the lower row and the leading suction cylinders 20' in the upper row.
  • the operation of the blowings F 1 and F 2 is similar to that described above.
  • the leader cannot be doctored onto the broke conveyor.
  • blowings F 3 and F 4 are provided, by whose means the leader S is held on the leading cylinder 20'. Moreover, between the leading cylinders 20', it is possible to employ additional blow pipes 17, from which blowings F 5 are directed against the leader S so as to guide the leader over the suction zones of the leading cylinders 20' onto the following drying cylinder 10'.
  • Fig. 6 shows an application of the invention in a group gap formed between a group with single-wire draw and a group with twin-wire draw.
  • the web is transferred from the drying wire 11 of the group with single-wire draw by means of a suction box 32 after a guide roll 33a as a free draw Wp onto the lower wire 11 B of the group with twin-wire draw.
  • the group with twin-wire draw in the way known in prior art, there are two rows of steam-heated drying cylinders 10A and 10B, one row above the other, as well as an upper wire 11A and a lower wire 11 B, which are guided by guide rolls 31A; 31 B.
  • blow boxes 32 are placed, by whose means the support contact between the web and the wire is promoted.
  • the doctor beams 12 are provided with blow pipes 22, from which the blowings F 1 in accordance with the invention are directed at the area of the tip of the doctor blade 14.
  • a second blowing F 3 is also employed, which is directed towards the path of running of the leader S.
  • the blowings F 1 are not necessarily always needed in an area of twin-wire draw, or the blowings F 1 may be very weak. On the contrary, the blowings F 3 are even more helpful.
  • the web has free draws W o , and the leader S also runs along the same route when it is passed through the group with twin-wire draw, being aided by means of the method and the device of the invention.
  • Fig. 7 shows two subsequent groups with twin-wire draw.
  • the web is transferred as a free draw Wp from one group to the other and onto the first lower cylinder 10B in the latter group between the guide rolls 31A and 31 B.
  • Both of the groups with twin-wire draw are provided with doctor beams 12, at which blow pipes 22 in accordance with the invention are placed at suitable locations, from which blow pipes blowings F 1 and/or F 3 in accordance with the invention are applied to produce the effects described above.
EP91850239A 1990-10-01 1991-09-30 Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn Expired - Lifetime EP0479748B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI904841 1990-10-01
FI904841A FI86900C (fi) 1990-10-01 1990-10-01 Foerfarande och anordning vid spetsdragning av en pappersbana i maongcylindertorken av en pappersmaskin

Publications (2)

Publication Number Publication Date
EP0479748A1 true EP0479748A1 (de) 1992-04-08
EP0479748B1 EP0479748B1 (de) 1996-05-29

Family

ID=8531155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850239A Expired - Lifetime EP0479748B1 (de) 1990-10-01 1991-09-30 Verfahren und Vorrichtung in der Trockenpartie einer Papiermaschine zum Einfädeln einer Papierbahn

Country Status (5)

Country Link
EP (1) EP0479748B1 (de)
AT (1) ATE138702T1 (de)
CA (2) CA2052059C (de)
DE (1) DE69119859T2 (de)
FI (1) FI86900C (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639668A3 (de) * 1993-08-06 1996-02-07 Voith Gmbh J M Trockenpartie.
EP0726355A3 (de) * 1995-02-09 1996-08-21 Voith Sulzer Papiermasch Gmbh
DE19548303A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
US6145217A (en) * 1997-06-25 2000-11-14 Voith Sulzer Papermaschinen Gmbh Machine for manufacturing a material web
WO2002070819A1 (en) * 2001-03-06 2002-09-12 Metso Paper, Inc. Arrangement in the drying section of a paper machine
WO2004094723A1 (en) * 2003-04-24 2004-11-04 Metso Paper, Inc. Doctor for a paper or board machine
DE112006002218T5 (de) 2005-08-25 2008-07-03 Metso Paper, Inc. Verfahren und Vorrichtung zum Endaufführen in einer Einzelsiebzug-Trockenpartie einer Bahnherstellungsmaschine
WO2009063132A1 (en) 2007-11-14 2009-05-22 Metso Paper, Inc. A method, a blade holder and a doctor apparatus for detaching a web threading tail from a moving surface in a fiber web machine
EP2489782A1 (de) * 2011-02-17 2012-08-22 Metso Paper Inc. Verfahren und Anordnung bei der Streifenüberführung einer Bahn mit voller Breite in der Trockenpartie einer Faserbahnmaschine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5661911A (en) * 1994-02-17 1997-09-02 Valmet Corporation Dryer section of a paper machine
FI93875C (fi) * 1994-02-17 1995-06-12 Valmet Paper Machinery Inc Menetelmä paperirainan kuivatuksessa sekä paperikoneen kuivatusosa
DE102012212071A1 (de) * 2012-07-11 2013-10-02 Voith Patent Gmbh Trockenpartie
FI126414B (fi) * 2015-10-09 2016-11-30 Valmet Technologies Oy Kaavinventilaattoripalkki kuiturainakoneen kuivatusosan kaavinta varten ja asennussarja kaavinventilaattorin muodostamiseksi kuiturainakoneen kuivatusosan kaavinpalkista
CN108061453A (zh) * 2017-11-20 2018-05-22 湖州翔顺工贸有限公司 一种纺织加工用烘干装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI54954B (fi) * 1977-07-07 1978-12-29 Valmet Oy Foerfarande i torkpartiet av en pappersmaskin foer att saekra banans oeverfoering fraon presspartiet till torkpartiet
FI62571B (fi) * 1980-12-01 1982-09-30 Valmet Oy Anordning vid flercylindertork i en pappersmaskin
DE3435308A1 (de) * 1983-10-03 1985-05-09 Valmet Oy, Helsinki Verfahren und vorrichtung an der trockenpartie einer papiermaschine zur fuehrung des bahnendauffuehrungsbandes
GB2158047A (en) * 1984-05-04 1985-11-06 Valmet Oy A paper machine having a device for guiding the leader of the web
DE3524006A1 (de) * 1984-07-05 1986-02-06 Valmet Oy, Helsinki Vorrichtung in einer papiermaschine zum transport und zur fuehrung des bahnendauffuehrungsbandes
WO1990002225A1 (en) * 1988-08-23 1990-03-08 Beloit Corporation A tail cutter apparatus and method
EP0364114A1 (de) * 1988-09-29 1990-04-18 Pulp and Paper Research Institute of Canada Überführen einer feuchten Zellulosebahn
DE3941242A1 (de) * 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI54954B (fi) * 1977-07-07 1978-12-29 Valmet Oy Foerfarande i torkpartiet av en pappersmaskin foer att saekra banans oeverfoering fraon presspartiet till torkpartiet
FI62571B (fi) * 1980-12-01 1982-09-30 Valmet Oy Anordning vid flercylindertork i en pappersmaskin
DE3435308A1 (de) * 1983-10-03 1985-05-09 Valmet Oy, Helsinki Verfahren und vorrichtung an der trockenpartie einer papiermaschine zur fuehrung des bahnendauffuehrungsbandes
GB2158047A (en) * 1984-05-04 1985-11-06 Valmet Oy A paper machine having a device for guiding the leader of the web
DE3524006A1 (de) * 1984-07-05 1986-02-06 Valmet Oy, Helsinki Vorrichtung in einer papiermaschine zum transport und zur fuehrung des bahnendauffuehrungsbandes
WO1990002225A1 (en) * 1988-08-23 1990-03-08 Beloit Corporation A tail cutter apparatus and method
EP0364114A1 (de) * 1988-09-29 1990-04-18 Pulp and Paper Research Institute of Canada Überführen einer feuchten Zellulosebahn
DE3941242A1 (de) * 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639668A3 (de) * 1993-08-06 1996-02-07 Voith Gmbh J M Trockenpartie.
EP0726355A3 (de) * 1995-02-09 1996-08-21 Voith Sulzer Papiermasch Gmbh
DE19548303A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
WO1997023690A1 (de) * 1995-12-22 1997-07-03 Voith Sulzer Papiermaschinen Gmbh Trockenpartie
DE19548303B4 (de) * 1995-12-22 2006-08-31 Voith Paper Patent Gmbh Trockenpartie
US6145217A (en) * 1997-06-25 2000-11-14 Voith Sulzer Papermaschinen Gmbh Machine for manufacturing a material web
US6772533B2 (en) 2001-03-06 2004-08-10 Metso Paper, Inc. Arrangement in the drying section of a paper machine
WO2002070819A1 (en) * 2001-03-06 2002-09-12 Metso Paper, Inc. Arrangement in the drying section of a paper machine
WO2004094723A1 (en) * 2003-04-24 2004-11-04 Metso Paper, Inc. Doctor for a paper or board machine
DE112006002218T5 (de) 2005-08-25 2008-07-03 Metso Paper, Inc. Verfahren und Vorrichtung zum Endaufführen in einer Einzelsiebzug-Trockenpartie einer Bahnherstellungsmaschine
WO2009063132A1 (en) 2007-11-14 2009-05-22 Metso Paper, Inc. A method, a blade holder and a doctor apparatus for detaching a web threading tail from a moving surface in a fiber web machine
US8221589B2 (en) 2007-11-14 2012-07-17 Metson Paper, Inc. Method, a blade holder and a doctor apparatus for detaching a web threading tail from a moving surface in a fiber web machine
EP2489782A1 (de) * 2011-02-17 2012-08-22 Metso Paper Inc. Verfahren und Anordnung bei der Streifenüberführung einer Bahn mit voller Breite in der Trockenpartie einer Faserbahnmaschine

Also Published As

Publication number Publication date
FI86900B (fi) 1992-07-15
DE69119859T2 (de) 1996-10-24
FI86900C (fi) 1992-10-26
ATE138702T1 (de) 1996-06-15
DE69119859D1 (de) 1996-07-04
CA2052059A1 (en) 1992-04-02
EP0479748B1 (de) 1996-05-29
CA2052059C (en) 1999-02-16
FI904841A (fi) 1992-04-02
CA2052596A1 (en) 1992-04-02
FI904841A0 (fi) 1990-10-01

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