EP0304098A1 - Former für die Bildung einer Papierbahn - Google Patents

Former für die Bildung einer Papierbahn Download PDF

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Publication number
EP0304098A1
EP0304098A1 EP88201361A EP88201361A EP0304098A1 EP 0304098 A1 EP0304098 A1 EP 0304098A1 EP 88201361 A EP88201361 A EP 88201361A EP 88201361 A EP88201361 A EP 88201361A EP 0304098 A1 EP0304098 A1 EP 0304098A1
Authority
EP
European Patent Office
Prior art keywords
forming
forming roll
paper web
former according
roll
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.)
Withdrawn
Application number
EP88201361A
Other languages
English (en)
French (fr)
Inventor
Erik Albert Nykopp
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 Paper Machinery Inc
Original Assignee
Valmet Paper Machinery Inc
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 filed Critical Valmet Paper Machinery Inc
Publication of EP0304098A1 publication Critical patent/EP0304098A1/de
Withdrawn legal-status Critical Current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 present invention relates to a former for forming a paper web by draining stock between two endless forming fabric loops, a first forming roll being located within one loop and a second forming roll within the other loop, and said fabrics meeting on the first forming roll, following the periphery thereof over a first wrapping angle and under deflection in a first direction, whereafter the fabrics sandwiching the partially formed paper web between them cross unsupported to the second forming roll and follow the periphery thereof over a second wrapping angle and under deflection in a second direction contrary to the first one, so that the forming of the paper web will be completed on the second forming roll, and said two forming rolls having an open surface, so that the drainage on each of them will be two-sided.
  • the object of the present invention is to provide a former, which has an improved drainage capacity without waiving the demand for a good web formation, and which is especially suited for the manufacture of thick multilayer papers where the formation in each separate layer is important.
  • this object is achieved in that said wrapping angles together are larger than 165°, the distance between the forming rolls being smaller than about 0.1 D, where D is the diameter of the second forming roll and the free fabric length between the forming rolls being between 0.1 m and 0.6 m.
  • the former according to the invention will have an improved drainage capacity combined with a preserved good formation.
  • the two forming rolls are located substantially at equal levels, and the loop inside which the first forming roll is located is an upper fabric loop, and in addition, the first wrapping angle is larger than about 60° and the second one is larger than about 135°.
  • the first wrapping angle is between 60° and 70° and the second one between 140° and 170°.
  • the upper limits are approximate figures determined by the problems of handling the white water from the two forming rolls. An old fourdrinier former may well be rebuilt to this preferred embodiment of the former according to the invention.
  • the two forming rolls are located substantially on top of each other, and the fabric loop inside which the first forming roll is located is a lower forming roll.
  • the first wrapping angle is larger than about 150° while the second one is larger than about 75°.
  • This former will have a larger height than the one according to the first preferred embodiment, but since the white water handling at the forming rolls is facilitated by gravitation, this former will have a lower minimum speed, which may be an advantage if the capacity in the drying section of the paper machine is low.
  • the distance between the forming rolls is smaller than 0.1 m.
  • the distance is on the order of 0.06 m.
  • the free fabric length between the forming rolls is suitably 0.3 - 0.4 m.
  • the fabrics with the completely formed paper web sandwiched between them together run off from the second forming roll in a downwards direction substantially vertical.
  • one fabric loop is a lower fabric loop having a predrainage section located upstream of the first forming roll.
  • Such an embodiment of the former according to the invention is excellently suited for the forming of a multilayer paper web.
  • a primary headbox is mounted to discharge a homogeneous stock jet to the start of the predrainage section where a first layer of the paper web is formed
  • a secondary headbox is mounted to discharge a stock jet onto the first layer of the web adjacent the area where the fabrics start wrapping the first forming roll.
  • the secondary headbox is a multilayer headbox, preferably a two-layer headbox.
  • the fabrics form between them a forming gap curving along a portion of the periphery of the first forming roll, a multilayer headbox, preferably a three-layer headbox, being mounted to discharge a multilayered jet of at least two different stocks into said gap.
  • FIGS. 1, 2 and 3 are schematic side views of a first, a second, and a third, respectively, preferred embodiment of a former according to the invention.
  • the former shown in FIG. 1 comprises two endless forming fabric loops 1 and 3.
  • a first forming roll 5 is located in one loop, in this case the upper loop 1, and a second forming roll 7 in the other loop.
  • Both of the forming rolls 5 and 7 have an open envelope surface, e.g. grooved or blind drilled.
  • each fabric loop is kept stretched in its intended operational position by means of a plurality of guide rolls, a stretch roll and an alignment roll.
  • the fabrics 1 and 3 meet on the first forming roll 5, follow the periphery thereof over a first wrapping angle alpha under deflection in a first direction, whereafter the fabrics 1 and 3, which between them confine the partially formed paper web, cross unsupported to the second forming roll 7 and follow the periphery thereof over a second wrapping angle beta under deflection in a second direction contrary to the first one, so that the forming of the paper web is completed on the second forming roll 7. Since both of the forming rolls 5 and 7, which preferably are at least substantially of the same size, are open surfaced, the drainage on each of them will be two-sided.
  • said wrapping angles alpha and beta are together larger than 165°, the distance between the forming rolls 5 and 7 is smaller than about 0.1 D, where D is the diameter of the second forming roll 7, and the free fabric length between the forming rolls 5 and 7 is between 0.1 m and 0.6 m.
  • the two forming rolls 5 and 7 are located at substantially equal levels, and fabric loop 1, within which the first forming roll 5 is located, is an upper fabric loop.
  • the first wrapping angle alpha is larger than 60° and preferably is between 60° and 70°
  • the second wrapping angle beta is larger than about 175° and preferably is between 140° and 170°.
  • the distance between the forming rolls 5 and 7 is smaller than 0.1 m and preferably is on the order of 0.06 m.
  • the free fabric length between the forming rolls 5 and 7 suitably is between 0.3 and 0.4 m
  • a first save-all 9 is provided within fabric loop 1 for collecting and drawing off white water thrown out from the shell of the first forming roll 5 and from the inner side of fabric loop 1 where it curves along the periphery of the second forming roll 7.
  • a second save-all 11 is provided within fabric loop 3 for collecting and drawing off white water thrown out from the inner side of fabric loop 3, where it curves along the periphery of the first forming roll 5, and from the shell of the second forming roll 7.
  • the second save-all 11 comprises means 13 in the shape of at least one guide vane or guide plate having an arcuate cross section and mounted between the forming rolls for catching the white water thrown out from the first forming roll 5 within fabric loop 3 and preventing the white water thrown out from hitting the second forming roll 7.
  • the sandwich of wires 1 and 3 with the intermediate completely formed paper web which runs off downwards substantially vertical from the second forming roll 7, is deflected more than 90° over a guide roll 15 and is conducted to a separating roll 17.
  • the outer fabric 1 in relation to the separating roll 17 is separated from the paper web and the inner wire 3 in a manner generally known per se, the inner wire 3 conveying the web to a pick-up location, where a conventional pick-up mechanism, not shown, in a conventional manner picks up the paper web from the fabric for the pressing of the web in a press section, not shown.
  • fabric loop 3 is a lower fabric loop having a predrainage section 19 of fourdrinier type.
  • predrainage section fabric 3 is supported by not shown but in fourdrinier sections commonly used fabric supporting draining members, for example suction boxes and/or foils.
  • a primary headbox 21 is mounted to discharge a homogenous stock jet to the start of the predrainage section 19 for the forming of a first layer of the paper web on the top surface of forming fabric 3 by one-sided drainage downwards. Adjacent the area where fabrics 1 and 3 start curving along the periphery of the first forming roll 5 a stock jet from a secondary headbox 23 is discharged onto the newly formed layer of the paper web.
  • the secondary headbox can be a two-layer headbox, which makes the former according to the invention adapted to the production of three-layer paper webs.
  • the one-sided drainage downwards on the predrainage section 19 is followed by a first two-sided drainage while curving upwards on the first forming roll 5 and a second two-sided drainage while curving downwards on the second forming roll 7, where the forming of the web is completed.
  • the lower forming fabric loop 203 does not have a predrainage section similar to section 19 in FIG. 1.
  • the former according to FIG. 2 is almost a twin-wire former of roll type, while the former according to FIG. 1 as a rule would be called a hybrid former.
  • Fabrics 201 and 203 define between them a forming gap 225 curving along a portion of the periphery of the first forming roll 205.
  • a multilayer headbox 222 preferably a three-layer headbox, is mounted to discharge a multilayer jet of at least two different stocks into the forming gap 225.
  • SE-C-440,924 CA-A-1,139,142.
  • reference numerals corresponding to FIG. 1, but selected from the 200-series are inserted in FIG. 2 even though they are not expressly mentioned in the present paragraph of the description.
  • the two forming rolls 305 and 307 are located substantially on top of each other and the fabric loop 301, within which the first forming roll 305 is located, is a lower fabric loop.
  • predrainage section 319 is incorporated in fabric loop 301.
  • in the predrainage section there will be a drainage of a homogeneous stock jet discharged from a primary headbox 321 for forming the first layer of the paper web on fabric loop 301.
  • the secondary headbox 323 discharges a preferably two-layered stock jet onto the first layer adjacent the area where the fabrics 301 and 303 start curving along the periphery of the first forming roll 305.
  • the first wrapping angle alpha is considerably greater than the second one beta and is more than about 150°, while angle beta is more than about 75°.
  • first save-all 309 located within fabric loop 301 and a second save-all 311 located within fabric loop 303.
  • the second save-all 311 comprises means in the shape of at least one guide vane or guide plate having a curved cross section and placed between forming rolls 305 and 307 for catching within fabric loop 303 the white water thrown out from the first forming roll 305 and preventing the thrown out white water from hitting the second forming roll 307.
  • This means corresponds to means 13 in FIG. 1 but is not shown in FIG. 3.

Landscapes

  • Paper (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP88201361A 1987-07-17 1988-06-30 Former für die Bildung einer Papierbahn Withdrawn EP0304098A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8702895 1987-07-17
SE8702895A SE458212B (sv) 1987-07-17 1987-07-17 Formare foer formning av en pappersbana

Publications (1)

Publication Number Publication Date
EP0304098A1 true EP0304098A1 (de) 1989-02-22

Family

ID=20369146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201361A Withdrawn EP0304098A1 (de) 1987-07-17 1988-06-30 Former für die Bildung einer Papierbahn

Country Status (4)

Country Link
EP (1) EP0304098A1 (de)
JP (1) JPS6433296A (de)
FI (1) FI883328A (de)
SE (1) SE458212B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716184A3 (de) * 1994-12-09 1997-07-09 Voith Sulzer Papiermasch Gmbh Verfahren zur Entwässerung einer Papierfaserstoffschicht in einem Doppelsieb-Former und Vorrichtung zu seiner Durchführung
KR20030002096A (ko) * 2001-06-30 2003-01-08 전진화 제지시스템
WO2012041624A1 (de) * 2010-09-30 2012-04-05 Voith Patent Gmbh Maschine für die entwässerung von zellstoff
WO2013143713A1 (de) * 2012-03-28 2013-10-03 Voith Patent Gmbh Maschine für die entwässerung von zellstoff
WO2019043608A1 (en) * 2017-09-01 2019-03-07 Stora Enso Oyj PROCESS FOR PRODUCING CARTON, CARDBOARD, AND CORRUGATED CARDBOARD

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4655043B2 (ja) 2004-11-30 2011-03-23 旭硝子株式会社 モールド、および転写微細パターンを有する基材の製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2091560A5 (en) * 1970-05-14 1972-01-14 Voith Gmbh Double wire paper making machine - with pair of headboxes - attached to wire screens
DE3100713A1 (de) * 1980-11-26 1982-07-01 Escher Wyss Gmbh, 7980 Ravensburg Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben"
WO1982002910A1 (en) * 1981-02-28 1982-09-02 Zag Heinz Device for continuously dehydrating a fiber web
EP0072188A2 (de) * 1981-08-07 1983-02-16 Dominion Engineering Works Limited Maschine zur Herstellung von Bahnen
AT375695B (de) * 1982-06-15 1984-08-27 Escher Wyss Gmbh Doppelsieb-papiermaschine
DE3532458A1 (de) * 1984-09-12 1986-03-13 Mitsubishi Jukogyo K.K., Tokio/Tokyo Vorrichtung zum gleichmaessigen verteilen (oder dispergieren) von papierstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2091560A5 (en) * 1970-05-14 1972-01-14 Voith Gmbh Double wire paper making machine - with pair of headboxes - attached to wire screens
DE3100713A1 (de) * 1980-11-26 1982-07-01 Escher Wyss Gmbh, 7980 Ravensburg Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben"
WO1982002910A1 (en) * 1981-02-28 1982-09-02 Zag Heinz Device for continuously dehydrating a fiber web
EP0072188A2 (de) * 1981-08-07 1983-02-16 Dominion Engineering Works Limited Maschine zur Herstellung von Bahnen
AT375695B (de) * 1982-06-15 1984-08-27 Escher Wyss Gmbh Doppelsieb-papiermaschine
DE3532458A1 (de) * 1984-09-12 1986-03-13 Mitsubishi Jukogyo K.K., Tokio/Tokyo Vorrichtung zum gleichmaessigen verteilen (oder dispergieren) von papierstoff

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716184A3 (de) * 1994-12-09 1997-07-09 Voith Sulzer Papiermasch Gmbh Verfahren zur Entwässerung einer Papierfaserstoffschicht in einem Doppelsieb-Former und Vorrichtung zu seiner Durchführung
KR20030002096A (ko) * 2001-06-30 2003-01-08 전진화 제지시스템
WO2012041624A1 (de) * 2010-09-30 2012-04-05 Voith Patent Gmbh Maschine für die entwässerung von zellstoff
CN103154363A (zh) * 2010-09-30 2013-06-12 沃依特专利有限责任公司 用于纸浆脱水的机器
WO2013143713A1 (de) * 2012-03-28 2013-10-03 Voith Patent Gmbh Maschine für die entwässerung von zellstoff
CN104246071A (zh) * 2012-03-28 2014-12-24 沃依特专利有限责任公司 用于纸浆脱水的机器
WO2019043608A1 (en) * 2017-09-01 2019-03-07 Stora Enso Oyj PROCESS FOR PRODUCING CARTON, CARDBOARD, AND CORRUGATED CARDBOARD
US11441272B2 (en) 2017-09-01 2022-09-13 Stora Enso Oyj Method to produce a paperboard, a paperboard and a corrugated board

Also Published As

Publication number Publication date
SE458212B (sv) 1989-03-06
JPS6433296A (en) 1989-02-03
FI883328A0 (fi) 1988-07-13
SE8702895D0 (sv) 1987-07-17
SE8702895L (sv) 1989-01-18
FI883328A (fi) 1989-01-18

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