EP0496073A1 - Formeur à double toile - Google Patents

Formeur à double toile Download PDF

Info

Publication number
EP0496073A1
EP0496073A1 EP91121320A EP91121320A EP0496073A1 EP 0496073 A1 EP0496073 A1 EP 0496073A1 EP 91121320 A EP91121320 A EP 91121320A EP 91121320 A EP91121320 A EP 91121320A EP 0496073 A1 EP0496073 A1 EP 0496073A1
Authority
EP
European Patent Office
Prior art keywords
forming
twin
wire former
former according
roller
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
EP91121320A
Other languages
German (de)
English (en)
Other versions
EP0496073B1 (fr
Inventor
Alfred Dr. Bubik
Otto Hildebrand
Karl Müller
Jörg Walter
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.)
Voith Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Voith Sulzer Papiermaschinen GmbH
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 Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0496073A1 publication Critical patent/EP0496073A1/fr
Application granted granted Critical
Publication of EP0496073B1 publication Critical patent/EP0496073B1/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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a twin wire former for paper production, with two circulating endless wire, which converge to form a material inlet gap and in this state are guided together along a forming zone, one of the wires being a transport wire and the other a counter wire, with at least one forming roller , over the circumference of which at least partially the two endless screens are guided together, with at least one stationary forming element resting on at least one of the screens in at least one side in a first forming section lying in front of the forming roller in the direction of wire travel.
  • twin wire former is known from DE-38 15 470 A1.
  • forming shoes, forming rollers and support surfaces are installed, which are supposed to guide a first or second wire.
  • the shear stress between the sieves on the suspension is weak and therefore the former has to be operated with a lot of dilution water.
  • packaging papers from 280 to 100 g / m2, this leads to large overall heights of the former, which can be greater than 8 m, and requires a longer sheet formation length.
  • this twin wire former when forming the web, i.e. the formation ends at a point E of the wrapping length of the forming roll. However, this is followed by dewatering on a support surface and a suction roll.
  • a second forming section is provided in the direction of wire travel behind the forming roller, in which at least one further stationary forming element rests on at least one of the screens on at least one side.
  • the system according to the invention thus avoids soiling and so-called substance mist formation.
  • good water drainage is also possible against gravity, without the need to first collect the white water via guide surfaces.
  • the two forming sections are preferably arranged at an angle between 30 and 120 ° and in particular essentially at 90 ° to one another.
  • One of the two forming sections can be arranged essentially horizontally.
  • the first forming section can be oriented vertically in connection with a vertically directed or inclined headbox.
  • the intermediate forming roll eliminates the need for a special suction roll. Nevertheless, the second forming section achieves a higher dry content than in the twin-wire former of DE 38 15 470 A1 using the suction roll, and also a better formation, in particular with a relatively small deflection over the forming roll in combination with a low height Shear occurs, in contrast to the relatively large shear on the formed web by the 180 o deflection on the suction roll of DE 38 15 470 A1.
  • the forming roller lying between the stationary forming elements has a very strong influence on the drainage.
  • the deflection on the forming roller means that the former can be built very compactly and, at the same time, the dewatering is improved by centrifugal centrifugal force.
  • the stock inlet gap can expediently be arranged above or below the first forming section.
  • the stationary forming elements can be formed by a so-called forming shoe or at least one forming pressure bar.
  • the resilient, adjustable forming pressure bars SP bars are arranged either on the left or right or above or below.
  • a further forming roller in the vicinity of the headbox, in particular below the first, vertical forming section, either on the left or right side.
  • two further forming rollers can also be provided.
  • the forming rollers in the area of the headbox have a calming (turbulence-reducing) effect on the stock suspensions. This may be desirable, but is not always desirable. If there are no forming rollers in this area, the material with the turbulence leading from the headbox is guided into the turbulence-maintaining or reinforcing zone, which is characterized by stationary strips that touch the screen.
  • the main forming roll follows, which leads to a substantial calming of the turbulent suspension, and then another turbulence generation occurs again through the second forming section with at least one stationary forming element.
  • This second turbulence generation prevents flocculation in the suspension layer in particular.
  • the presence of a turbulence-increasing forming section after the deflection or forming roll is an important characteristic of this invention.
  • a drainage effect of approx. 20% occurs in the first, in particular vertical, forming section with the stationary forming elements.
  • a dewatering effect of approx. 40% takes place in the intermediate forming roll itself.
  • a dewatering effect of approximately 20% for example.
  • the particularly advantageous embodiment of the invention with the two Formierumblen and intermediate Schoformierwalze includes a substantially vertical orientation of the first forming section, an approximately 90 ° deflection in the range of Hauptformierwalze and a substantially horizontally oriented subsequent second forming section.
  • the length of the second forming section is expediently at least 80% of the wrap length of the forming roll lying between the forming sections. But it can also be the same or larger.
  • four to five forming bars can preferably be arranged one behind the other at a forming point.
  • At least two stationary forming elements can be arranged in essentially opposite directions in the first forming section and also in the second forming section, although they do not have to overlap one another in their full length.
  • one of the opposing forming elements can be designed as a forming shoe with a curved or straight contact surface and the other forming element as at least one forming pressure bar.
  • the stationary forming element located at the top can in particular be designed as a forming shoe with suction drainage.
  • the stationary forming element in particular a molded shoe, can be followed by a separating element, which is designed, for example, as a separating roller or as a separating suction device.
  • a pre-suction device can be connected upstream of the stationary forming element, in particular a forming shoe, and in particular an upper forming shoe, in the second forming section.
  • a curved forming shoe which lies in particular on the transport screen below, can be directly connected upstream of a stationary forming element, which is in particular at the top and in particular in the form of a forming shoe.
  • the screen length of the first forming section (F1) touched by the forming shoe is preferably shorter than the loop length of the downstream forming roll.
  • the forming roll between the forming sections can be an open forming roll, either one whose surface is opened up by a honeycomb structure or a suction roll.
  • the active surface of the stationary shaped element can lie in the area between the upper and lower apex of the forming roller located between the forming sections.
  • the twin-wire former of the various exemplary embodiments has a first wire 10 as the transport wire and also a second wire 12.
  • the sieves move in the direction of the arrows indicated and converge in a stock inlet gap 14.
  • the sieves 10 and 12 are guided over breast rollers 16, 18, these breast rollers in FIGS. 2 and 3 being designed as open forming rollers 16 ', around which both sieves are brought together at a certain angle, including the fiber suspension.
  • a headbox nozzle 20 In front of the stock inlet gap is a headbox nozzle 20.
  • the headbox takes place vertically downwards via this nozzle 20, in FIG. 2 from left to top right, likewise in FIG. 3 and in FIG. 4 essentially vertically from bottom to top.
  • the screens 10 and 12 are guided as endless screens over deflecting rollers 22 and 24, respectively.
  • the second sieve 12 is only partially shown in FIGS. 2 and 3.
  • the entire forming zone is divided into two forming sections, a first one Forming section F1 and a second forming section F2, in which the two screens are moved together with the interposition of the fiber suspension.
  • a first one Forming section F1 and a second forming section F2 in which the two screens are moved together with the interposition of the fiber suspension.
  • the twin wire is deflected there.
  • the deflection angle in the exemplary embodiments according to FIGS. 1, 2, 3, 4, 5 and 6 is approximately 90 ° .
  • the deflection angle can be in the range from 30 o to 120 o . This requires a corresponding wrap angle alpha of the main forming roller 26.
  • forming pressure bars 30 for example four to five
  • the respective water withdrawal systems are adapted to whether the water is drawn off with or against gravity.
  • one forming section runs essentially horizontally and the other runs essentially vertically.
  • the first forming section F1 is in a vertical orientation and the forming section F2 in a horizontal orientation, which in principle can also be the other way round, although the exemplary embodiments shown are of particular advantage.
  • a separating suction device 23 which is designed as a separating roller 21 in FIG. 6 and also in FIG. 3, is preferably arranged on the transport screen 10 behind the forming section F2 .
  • the formation shoes can be provided with a curved, but also with a straight surface. They can be operated with or without vacuum. If there is no support by a forming element directly opposite, the forming shoe is preferably provided with a curved surface, as can be seen in particular in FIG. 6. 5, 6 and 7, another forming shoe with preliminary suction 33 can be provided in front of the forming shoe 28 on the side of the counter screen 12.
  • the main forming roller can be designed as an open roller, for example one with a grill structure (honeycomb structure), open roller or as a suction roller.

Landscapes

  • Paper (AREA)
EP91121320A 1991-01-24 1991-12-12 Formeur à double toile Expired - Lifetime EP0496073B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4102065A DE4102065C2 (de) 1991-01-24 1991-01-24 Doppelsiebformer
DE4102065 1991-01-24

Publications (2)

Publication Number Publication Date
EP0496073A1 true EP0496073A1 (fr) 1992-07-29
EP0496073B1 EP0496073B1 (fr) 1995-04-05

Family

ID=6423626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91121320A Expired - Lifetime EP0496073B1 (fr) 1991-01-24 1991-12-12 Formeur à double toile

Country Status (5)

Country Link
US (1) US5259929A (fr)
EP (1) EP0496073B1 (fr)
AT (1) ATE120817T1 (fr)
CA (1) CA2059946C (fr)
DE (1) DE4102065C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301103C1 (de) * 1993-01-18 1994-08-18 Voith Gmbh J M Siebpartie einer Papiermaschine
DE19651241A1 (de) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Doppelsieb-Blattbildungseinrichtung

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310540C2 (de) * 1993-03-31 1997-06-12 Voith Sulzer Papiermasch Gmbh Leistenformer
SE501332C2 (sv) * 1993-05-27 1995-01-16 Valmet Karlstad Ab Sätt att forma en tissuepappersbana
JP3244911B2 (ja) * 1994-01-28 2002-01-07 三菱重工業株式会社 抄紙機のツインワイヤフォーマ
DE4420801C2 (de) * 1994-06-16 1997-01-30 Voith Gmbh J M Verfahren zum Betreiben einer Doppelsiebzone einer Papiermaschine zur Herstellung von Faserstoffbahnen sowie Siebzone hierzu
FI96623C (fi) * 1994-08-31 1996-07-25 Valmet Paper Machinery Inc Kaksiviiraformeri, etenkin nopeille paperikoneille
DE19530983B4 (de) * 1995-08-23 2006-04-27 Voith Paper Patent Gmbh Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons
US5736011A (en) * 1996-07-17 1998-04-07 Voith Sulzer Paper Technology North America, Inc. Wet end assembly for a paper making machine
AT405538B (de) 1997-11-28 1999-09-27 Andritz Patentverwaltung Vorrichtung zum entwässern einer faserstoffbahn
DE19803591A1 (de) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Doppelsieb-Former
US6372091B2 (en) 1999-06-18 2002-04-16 Metso Paper, Inc. Method and apparatus for forming a paper web
DE19943369A1 (de) * 1999-09-10 2001-03-22 Voith Paper Patent Gmbh Doppelsiebformer
DE10009362A1 (de) * 2000-02-29 2001-08-30 Voith Paper Patent Gmbh Doppelsiebformer
DE10106731A1 (de) * 2001-02-14 2002-08-22 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
DE10116364A1 (de) * 2001-04-02 2002-10-10 Voith Paper Patent Gmbh Saugelement
DE10335362A1 (de) * 2003-08-01 2005-02-17 Voith Paper Patent Gmbh Doppelsiebformer
FI116628B (fi) * 2004-02-13 2006-01-13 Metso Paper Inc Monikerrosrainan muodostusosa
FI116688B (fi) * 2004-02-13 2006-01-31 Metso Paper Inc Monikerrosrainan muodostusosa
WO2013160527A1 (fr) * 2012-04-27 2013-10-31 Metso Paper, Inc. Section de formation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2000661A1 (de) * 1969-02-03 1970-09-03 Beloit Corp Verbesserte Vorrichtung zur Herstellung von Papier
DE2102717A1 (de) * 1970-01-26 1971-08-12 Enso Gutzeit Oy Verfahren und Vorrichtung zur Herstellung von Papier, Karton oder einer ähnlichen Fasermaterialbahn
US4125428A (en) * 1977-06-27 1978-11-14 The Black Clawson Company Vertical twin wire paper machine
EP0160615A2 (fr) * 1984-05-03 1985-11-06 Beloit Corporation Section de formage à double toile
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
WO1989011000A1 (fr) * 1988-05-06 1989-11-16 J.M. Voith Gmbh Formeur a deux toiles et procede pour fabriquer une bande continue de matiere fibreuse
US4925531A (en) * 1988-05-23 1990-05-15 Valmet Paper Machinery Inc. Twin wire former for a paper machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT379622B (de) * 1980-11-26 1986-02-10 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
DE3153305C2 (de) * 1981-09-04 1986-10-23 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI862809A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Stoedande av en avvattningsenhet pao pappersmaskinens formningsdel.
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus
JPH02133689A (ja) * 1988-11-14 1990-05-22 Mitsubishi Heavy Ind Ltd 抄紙機ツインワイヤホーマ
FI885607A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Anordning foer styrning av viror i en pappersmaskins former.
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2000661A1 (de) * 1969-02-03 1970-09-03 Beloit Corp Verbesserte Vorrichtung zur Herstellung von Papier
DE2102717A1 (de) * 1970-01-26 1971-08-12 Enso Gutzeit Oy Verfahren und Vorrichtung zur Herstellung von Papier, Karton oder einer ähnlichen Fasermaterialbahn
US4125428A (en) * 1977-06-27 1978-11-14 The Black Clawson Company Vertical twin wire paper machine
EP0160615A2 (fr) * 1984-05-03 1985-11-06 Beloit Corporation Section de formage à double toile
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
WO1989011000A1 (fr) * 1988-05-06 1989-11-16 J.M. Voith Gmbh Formeur a deux toiles et procede pour fabriquer une bande continue de matiere fibreuse
US4925531A (en) * 1988-05-23 1990-05-15 Valmet Paper Machinery Inc. Twin wire former for a paper machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301103C1 (de) * 1993-01-18 1994-08-18 Voith Gmbh J M Siebpartie einer Papiermaschine
US5480520A (en) * 1993-01-18 1996-01-02 J. M. Voith Gmbh Applying pressure on the web at the wire end of a paper machine
DE19651241A1 (de) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Doppelsieb-Blattbildungseinrichtung

Also Published As

Publication number Publication date
US5259929A (en) 1993-11-09
CA2059946C (fr) 1996-08-20
EP0496073B1 (fr) 1995-04-05
DE4102065A1 (de) 1992-07-30
ATE120817T1 (de) 1995-04-15
DE4102065C2 (de) 1996-02-01

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