US3846232A - Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll - Google Patents

Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll Download PDF

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Publication number
US3846232A
US3846232A US00344260A US34426073A US3846232A US 3846232 A US3846232 A US 3846232A US 00344260 A US00344260 A US 00344260A US 34426073 A US34426073 A US 34426073A US 3846232 A US3846232 A US 3846232A
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United States
Prior art keywords
web
wire
roll
forming
wires
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
US00344260A
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English (en)
Inventor
M Kankaanpaa
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Valmet Montreal Inc
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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 Oy filed Critical Valmet Oy
Priority to US00344260A priority Critical patent/US3846232A/en
Priority to GB1154974A priority patent/GB1452208A/en
Priority to AT226274A priority patent/AT340761B/de
Priority to DE2413421A priority patent/DE2413421C3/de
Priority to FR7409433A priority patent/FR2222481B1/fr
Priority to JP49031067A priority patent/JPS5024511A/ja
Priority to SE7403820A priority patent/SE397695B/xx
Priority to CA195,947A priority patent/CA1009883A/en
Priority to IT49633/74A priority patent/IT1005881B/it
Priority to US05/493,704 priority patent/US3997390A/en
Application granted granted Critical
Publication of US3846232A publication Critical patent/US3846232A/en
Assigned to VALMET-DOMINION INC., A COMPANY OF CANADA reassignment VALMET-DOMINION INC., A COMPANY OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VALMET OY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • a two-wire papermaking system which includes a looped web-carrying wire and a looped covering wire which together form a throat adjacent a suction web-forming breast roll and thereafter wrap around the breast roll along 90 to 120 degree are.
  • a headbox discharges slurry into the throat between the two wires.
  • the wires move along a curved path (formed by a wire-guide roll and a dewatering foil) and wrap around the surface of a suction couch roll located within I the loop of the web-carrying wire.
  • Adjustably positioned wire guiding rolls located within the looped web-carrying and cover wires prior to the web-forming breast roll allow for adjusting the throat size. Centrifugal dewatering occurs as the wires wrap around the web-forming roll. Slurry is discharged into the throat at a rate less than the speed of the wires.
  • the present invention concerns, in a paper making machine, a two-wire former wherein drainage of the paper web in the process of being formed takes place simultaneously through the carrying wire and the covering wire, and within which carrying wire there are two rolls with foraminous mantles, the first of these in the direction of travel of the web being a web-forming roll and the second a couch roll, and said web-forming roll comprising at least one dewatering compartment inside the shell and under the drainage zone, which is the sector that is covered by both wires and Where drainage of the fibre suspension is primarily achieved by bringing the wires together and which zone has most appropriately a length of 90 to 120 degrees of arc, said carrying wire and covering wire forming, adjacent to the web-forming roll and prior to its drainage zone, a throat, into which the headbox supplies fibre suspension.
  • twin-wire former constructions wherein drainage of the paper web that is being formed takes place in two directions simultaneously. It is obvious that the drainage is appreciably speeded up by this principle of operation.
  • the resulting paper web has a more nearly homogeneous structure than that produced by the aid of a conventional Fourdrinier wire, where drainage takes place in one direction only.
  • the path of the wires was vertical, and the slurry was fed from above into the gap between the wires
  • the newer types of two-wire formers differ from the original type, and mutually, mainly as regards the direction in which the pulp slurry is introduced between the wires and in the manner in which the joint travel of the wires has been arranged on that length of path where the web formation and the compaction of the web between these wires take place.
  • the aim of the present invention is to accomplish an efiicient dewatering unit of minimum size, compared with its production output, and which therefore would be inexpensive to construct and would be conducive to economy as regards the room space in the paper machine hall.
  • a further objective of the invention is to achieve highest possible symmetry of the dewatering of the fibre web, that is, equal removal of water through both surfaces of the web, yet in such manner that the above-mentioned drawbacks observed in connection with constructions of prior arts are avoided.
  • FIG. 1 shows, as a schematical elevational view, one embodiment of the invention while FIG. 2 presents another, slightly different embodiment example.
  • Figure 1a shows the foil type sealing lists.
  • the construction shown in the figures comprises two foraminous dewatering rolls 4 and 5 disposed within one and the same carrying wire loop.
  • a carrying wire is understood to be an endless wire upon which the paper web rests after the forming process and from which the web is picked up in a conventional manner for its further conduction into the press section of the paper machine.
  • the one of these rolls which is first in the direction of travel of the web 3 is a web-forming roll 4.
  • the peripheral velocity of the web-forming roll 4 and correspondingly the speed of the wires should be higher than the velocity of the pulp slurry jet.
  • the angle, or size, of the throat 12 can be regulated by changing the position of the first and second wire guiding rolls 8a and 7b.
  • the pressure developed in the pulp slurry between the wires 1 and 2 can be regulated.
  • the drainage begins efliciently, and symmetrically, in the throat 12 itself and continues thereafter on the web-forming roll 4 as a result of the pressure between the wires 1 and 2.
  • the water expressed from the pulp slurry escapes outwardly under centrifugal force efiect and also into the web-forming roll 4, through the holes or openings in the roll mantle. Suction aids the emptying of the holes. In certain operating conditions this suction is achieved without vacuum pump by using foil type sealing lists 16 in the dewatering compartment inside the shell mantle of the Web-forming roll. If the dewatering caused by centrifugal force tends to produce a symmetry at high running speeds, the covering wire 2 may be chosen to have a sufiiciently fine mesh. To counteract the centrifugal force in certain conditions the dewatering compartment of the wveb-forming roll can be connected to a vacuum system ad the vacuum can be adjusted in accordance with the operation requirements.
  • the wires 1, 2 are carried together along a slightly curved path to the couch roll 5.
  • the path is required to be curved in order to hold the wires 1 and 2 close together over the whole distance in question without need of applying any excessive tension or stretch to the covering wire 2.
  • the guiding means 10, 14 are either rotatable rolls or one or more fixed and narrow foils or deflectors 14, which exert the least possible abrasive effect on the wire 1.
  • the approximate curvature of the joint path of wires is depicted in FIGS. 1 and 2 and defined by radius R
  • the positive contiguity of the wires 1 and 2 may be assisted by means of a defiector 13 disposed on the side of the covering wire and which both urges against the wire and also serves as a dewatering means.
  • the couch roll 5, too, has most appropriately at least one dewatering compartment on its sector 7 connected to a suction system.
  • a small number of appropriate water removal means have been provided on either side of the wire run, such as deflectors 13, which have been disposed so as to present a minimum of edges rubbing against and causing abrasion of the wires 1, 2. It is also noted that these means exert no strong pressure against the wires 1, 2.
  • the small number of water disposal means also enables the distance between the web-forming roll 4 and the couch roll 5 to be kept comparatively short, this distance being most appropriately 1.5 to 2 times, but at the most 3 times, the diameter 2R of the roll 4.
  • the wire length that has been saved hereby can be utilized on the part of the path where the tension and guiding rolls 8 and 7, respectively, of the wires 1, 2 are found and whereby reliable arrangements can be made for the guidance of the wires.
  • the loop of the carrying wire 2 has been shaped to constitute a part having an elongated extension in the horizontal plane and trasporting the web forward, from which part the web is picked off by the aid of a suction roll 9.
  • the water removed at the web-forming roll 4 is collected in save-alls a provided for this roll alone and it is conducted to the intake of the mixing pump supplying the head box 11, to be used as diluting water.
  • the path jointly travelled by the wires 1, 2 curves in the same direction all the time (R R R ).
  • R R R The following inequalities of the radii R R R are also significant: 1 2; a i-
  • the covering wire 2 laps the third wire guiding roll 7a, which in its one extreme position serves as a couch presser roll and presses the fibre web 3 against the suction zone 7 of the couch roll 5 for more efiicient dewatering.
  • the position of the wire guiding roll 7a and thus the pressure of the wire against the couch roll 5 can be regulated, and in the other extreme position of the roll 7a (FIG. 2) the covering wire 2 can be made to cover the whole suction zone 7 of the couch roll 5.
  • Improvement in a two-wire former in a paper machine comprising in combination, a web-carrying Wire and a covering wire; two rolls with foraminous mantle surfaces within the loop of said carrying wire, wherein the one which is first in the direction of travel of the web is a web-forming roll and the second is a couch roll; dewatering compartments within the mantle of said rolls, at least one in each; said carrying wire and covering wire running along a common curved path starting at said web-forming roll and up to said couch roll, this path forming a convex part of'the loop of said carrying wire, the course of said curved path being determined by the positions of at least one wire-guiding means and furthermore at least one dewatering means placed within the loop of said carrying wire, and furthermore the carrying wire and covering wire both being conducted onto said web-forming roll each over its individual first and second wire-guiding roll to thereafter form a throat therebetween, means for adjusting the position of each of said first and second wire-guiding rolls; furthermore a headbox, which supplies
  • Two-wire former according to claim 1 further comrising at third wire guiding roll disposed within the loop of said covering wire and adjacent to the said couch roll, and means to adjust its position with reference to said couch roll.

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US00344260A 1965-08-14 1973-03-23 Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll Expired - Lifetime US3846232A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00344260A US3846232A (en) 1973-03-23 1973-03-23 Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll
GB1154974A GB1452208A (en) 1973-03-23 1974-03-15 Paper-making machines twin-wire forming section
AT226274A AT340761B (de) 1973-03-23 1974-03-19 Siebpartie fur papiermaschinen
FR7409433A FR2222481B1 (enrdf_load_stackoverflow) 1973-03-23 1974-03-20
JP49031067A JPS5024511A (enrdf_load_stackoverflow) 1973-03-23 1974-03-20
DE2413421A DE2413421C3 (de) 1973-03-23 1974-03-20 Doppelsiebpapiermaschine
SE7403820A SE397695B (sv) 1973-03-23 1974-03-21 Pappersmaskin med tva viror
CA195,947A CA1009883A (en) 1973-03-23 1974-03-22 Two-wire former in a paper machine
IT49633/74A IT1005881B (it) 1973-03-23 1974-03-25 Dispositivo formatore del nastro a due tele in una macchina per fab bricazione della carta
US05/493,704 US3997390A (en) 1965-08-14 1974-07-31 Twin-wire paper machine and method for operating the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00344260A US3846232A (en) 1973-03-23 1973-03-23 Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/493,704 Continuation-In-Part US3997390A (en) 1965-08-14 1974-07-31 Twin-wire paper machine and method for operating the same

Publications (1)

Publication Number Publication Date
US3846232A true US3846232A (en) 1974-11-05

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US00344260A Expired - Lifetime US3846232A (en) 1965-08-14 1973-03-23 Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll

Country Status (9)

Country Link
US (1) US3846232A (enrdf_load_stackoverflow)
JP (1) JPS5024511A (enrdf_load_stackoverflow)
AT (1) AT340761B (enrdf_load_stackoverflow)
CA (1) CA1009883A (enrdf_load_stackoverflow)
DE (1) DE2413421C3 (enrdf_load_stackoverflow)
FR (1) FR2222481B1 (enrdf_load_stackoverflow)
GB (1) GB1452208A (enrdf_load_stackoverflow)
IT (1) IT1005881B (enrdf_load_stackoverflow)
SE (1) SE397695B (enrdf_load_stackoverflow)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985612A (en) * 1973-03-12 1976-10-12 Kazumasa Watanabe Paper making system including forming fabrics and porous forming cylinders
US4055461A (en) * 1975-09-17 1977-10-25 Valmet Oy Paper machine with single-wire and curved twin-wire formers
US4100018A (en) * 1975-06-23 1978-07-11 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for forming a fibrous web
US4113556A (en) * 1976-04-14 1978-09-12 Valmet Oy Paper machine with twin-wire former
US4116763A (en) * 1976-01-19 1978-09-26 Escher Wyss Gmbh Separating system for wires of a double-wire paper-making machine
US4370200A (en) * 1979-12-19 1983-01-25 Neue Bruderhaus Maschinenfabrik Gmbh Method of influencing a pre-drained fibrous web on a screen
US4443299A (en) * 1980-08-18 1984-04-17 James River-Dixie/Northern, Inc. Apparatus and method for the manufacture of a non-woven fibrous web
US4443297A (en) * 1980-08-18 1984-04-17 James River-Dixie/Northern, Inc. Apparatus and method for the manufacture of a non-woven fibrous web
US4477313A (en) * 1981-12-03 1984-10-16 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for producing a multilayer paper web
US4501040A (en) * 1980-02-06 1985-02-26 Escher Wyss Gmbh Method and apparatus for washing stock suspensions by removing undesired material through an endless wire
US4504358A (en) * 1980-06-05 1985-03-12 Kmw Aktiebolag Apparatus for handling white water in a twin-wire machine
US4686005A (en) * 1980-02-06 1987-08-11 Escher Wyss Gmbh Method of washing stock suspensions by removing undesired material through an endless revolving wire
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
US4908102A (en) * 1981-02-28 1990-03-13 J. M. Voith Gmbh. Device for continuously dewatering a fiber web
US4915791A (en) * 1988-05-18 1990-04-10 Oy Tampella Ab Roll with blades rotatably mounted within it in the forming section of a paper machine
US5059286A (en) * 1989-04-22 1991-10-22 J.M. Voith Gmbh Cylinder for the guiding of endless webs of material
EP0475921A1 (en) * 1990-09-12 1992-03-18 Valmet Corporation Twin-wire web in a paper machine
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
US5647958A (en) * 1994-06-16 1997-07-15 Voith Sulzer Papiermaschinen Gmbh Wire part of a machine for the manufacture of fibrous material webs
US6375799B1 (en) 1999-01-28 2002-04-23 Voith Sulzer Papiertechnik Patent Gmbh Process and apparatus for producing a fibrous material web
DE10063516A1 (de) * 2000-12-20 2002-06-27 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
US6413368B1 (en) 1990-10-17 2002-07-02 Fort James Corporation Foam forming method and apparatus
US20040144508A1 (en) * 2002-09-10 2004-07-29 Fibermark, Inc. Process for making a sheet of aramid fibers using a foamed medium
US20050039870A1 (en) * 2001-11-09 2005-02-24 Rainer Blomqvist Method and apparatus for foam forming
WO2008041901A1 (en) * 2006-10-06 2008-04-10 Metso Paper, Inc. Sealing elements in a twin-wire paper machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI72544C (fi) * 1975-06-13 1987-06-08 Valmet Oy Formare med tvao viror i pappersmaskin.
FI64958C (fi) * 1978-02-07 1984-02-10 Valmet Oy Banformare med dubbelvira foer en pappersmaskin
FI83977C (fi) * 1989-11-06 1991-09-25 Valmet Paper Machinery Inc Gapformare i pappersmaskin.
DE19903943A1 (de) * 1999-01-28 2000-08-03 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985612A (en) * 1973-03-12 1976-10-12 Kazumasa Watanabe Paper making system including forming fabrics and porous forming cylinders
US4100018A (en) * 1975-06-23 1978-07-11 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for forming a fibrous web
US4055461A (en) * 1975-09-17 1977-10-25 Valmet Oy Paper machine with single-wire and curved twin-wire formers
US4116763A (en) * 1976-01-19 1978-09-26 Escher Wyss Gmbh Separating system for wires of a double-wire paper-making machine
US4113556A (en) * 1976-04-14 1978-09-12 Valmet Oy Paper machine with twin-wire former
US4370200A (en) * 1979-12-19 1983-01-25 Neue Bruderhaus Maschinenfabrik Gmbh Method of influencing a pre-drained fibrous web on a screen
US4501040A (en) * 1980-02-06 1985-02-26 Escher Wyss Gmbh Method and apparatus for washing stock suspensions by removing undesired material through an endless wire
US4686005A (en) * 1980-02-06 1987-08-11 Escher Wyss Gmbh Method of washing stock suspensions by removing undesired material through an endless revolving wire
US4504358A (en) * 1980-06-05 1985-03-12 Kmw Aktiebolag Apparatus for handling white water in a twin-wire machine
US4443299A (en) * 1980-08-18 1984-04-17 James River-Dixie/Northern, Inc. Apparatus and method for the manufacture of a non-woven fibrous web
US4443297A (en) * 1980-08-18 1984-04-17 James River-Dixie/Northern, Inc. Apparatus and method for the manufacture of a non-woven fibrous web
US4908102A (en) * 1981-02-28 1990-03-13 J. M. Voith Gmbh. Device for continuously dewatering a fiber web
US4477313A (en) * 1981-12-03 1984-10-16 Aktiebolaget Karlstads Mekaniska Werkstad Method and apparatus for producing a multilayer paper web
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
US4915791A (en) * 1988-05-18 1990-04-10 Oy Tampella Ab Roll with blades rotatably mounted within it in the forming section of a paper machine
US5059286A (en) * 1989-04-22 1991-10-22 J.M. Voith Gmbh Cylinder for the guiding of endless webs of material
US5104489A (en) * 1989-04-22 1992-04-14 J.M. Voith Gmbh Cylinder for the guiding of endless webs of material
EP0475921A1 (en) * 1990-09-12 1992-03-18 Valmet Corporation Twin-wire web in a paper machine
US5215628A (en) * 1990-09-12 1993-06-01 Valmet Paper Machinery Inc. Twin-wire web former in a paper machine
US6413368B1 (en) 1990-10-17 2002-07-02 Fort James Corporation Foam forming method and apparatus
US6500302B2 (en) 1990-10-17 2002-12-31 Fort James Corporation Foam forming method and apparatus
US5300196A (en) * 1991-05-29 1994-04-05 Voith Gmbh Twin-wire former with frame for a paper making machine
US5498316A (en) * 1991-05-29 1996-03-12 J. M. Voith Gmbh Twin wire former for a paper making machine
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
US5647958A (en) * 1994-06-16 1997-07-15 Voith Sulzer Papiermaschinen Gmbh Wire part of a machine for the manufacture of fibrous material webs
US6375799B1 (en) 1999-01-28 2002-04-23 Voith Sulzer Papiertechnik Patent Gmbh Process and apparatus for producing a fibrous material web
DE10063516A1 (de) * 2000-12-20 2002-06-27 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
US20050039870A1 (en) * 2001-11-09 2005-02-24 Rainer Blomqvist Method and apparatus for foam forming
US7416636B2 (en) * 2001-11-09 2008-08-26 Ahlstrom Glassfibre Oy Method and apparatus for foam forming
US20040144508A1 (en) * 2002-09-10 2004-07-29 Fibermark, Inc. Process for making a sheet of aramid fibers using a foamed medium
US6921459B2 (en) 2002-09-10 2005-07-26 Fibermark, Inc. Process for making a sheet of aramid fibers using a foamed medium
US20060011315A1 (en) * 2002-09-10 2006-01-19 Fibermark, Inc. Process and apparatus for making a sheet of aramid fibers using a foamed medium
WO2008041901A1 (en) * 2006-10-06 2008-04-10 Metso Paper, Inc. Sealing elements in a twin-wire paper machine
US20100043995A1 (en) * 2006-10-06 2010-02-25 Metso Paper, Inc. Sealing elements in a twin-wire paper machine

Also Published As

Publication number Publication date
DE2413421A1 (de) 1974-10-24
JPS5024511A (enrdf_load_stackoverflow) 1975-03-15
CA1009883A (en) 1977-05-10
IT1005881B (it) 1976-09-30
AT340761B (de) 1978-01-10
DE2413421B2 (de) 1978-06-15
FR2222481B1 (enrdf_load_stackoverflow) 1979-10-12
DE2413421C3 (de) 1979-02-22
SE397695B (sv) 1977-11-14
ATA226274A (de) 1976-04-15
FR2222481A1 (enrdf_load_stackoverflow) 1974-10-18
GB1452208A (en) 1976-10-13

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Owner name: VALMET-DOMINION INC., 795 FIRST AVENUE, LACHINE, Q

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Effective date: 19840503

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