EP0454989A1 - Section de formage vertical - Google Patents

Section de formage vertical Download PDF

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Publication number
EP0454989A1
EP0454989A1 EP91104493A EP91104493A EP0454989A1 EP 0454989 A1 EP0454989 A1 EP 0454989A1 EP 91104493 A EP91104493 A EP 91104493A EP 91104493 A EP91104493 A EP 91104493A EP 0454989 A1 EP0454989 A1 EP 0454989A1
Authority
EP
European Patent Office
Prior art keywords
formation
former according
vertical former
forming
suction
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
EP91104493A
Other languages
German (de)
English (en)
Other versions
EP0454989B1 (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 EP0454989A1 publication Critical patent/EP0454989A1/fr
Application granted granted Critical
Publication of EP0454989B1 publication Critical patent/EP0454989B1/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 vertical former of a paper machine, in particular for the production of wood-free printing paper and linerboard or testliner, with a twin sieve, the two sieves of which are moved together with the suspension through an essentially vertical formation section, the formation section consisting of at least two formation zones , in each of which a forming element is arranged, which are arranged one behind the other in the direction of movement of the twin wire in the running direction and act on one or the other wire.
  • Such a vertical former is known from US Pat. No. 4,790,909.
  • curved suction boxes are arranged one after the other in the running direction after a forming roller, one suction box on one side and the other suction box offset in the running direction on the other side of the twin wire in order to achieve symmetrical dewatering and thus a symmetrical sheet structure.
  • the drainage takes place at different times, so that the two side areas without a forming element produce a different formation structure.
  • the screens are not guided over long distances, which leads to a wave formation of the screens across the web width and to streaky paper.
  • FI-PS 843 081 shows a vertical former in which a suction former is arranged directly above a vacuum shoe with a certain radium and opposite pressure bars. Another suction box is arranged behind the first-mentioned suction box in the running direction. This results in an uneven distribution of the drainage quantities and an asymmetrical path structure is achieved. Due to the radius of the vacuum shoe and the engagement of the rigid strips directly on top of each other, a very strong initial drainage is achieved, which leads to deformations in the web leads.
  • the invention has for its object to provide a vertical former of the type mentioned, in which an improved formation in connection with an improved web strength and in particular a more uniform web structure can be achieved without streaking.
  • An open forming roll is expediently connected upstream of the formation section.
  • an open forming roller can also be connected downstream of the formation section.
  • These forming rolls are preferably designed as suction rolls.
  • an improved formation in connection with an improved web strength and in connection with a more uniform web structure and smoothness on the surface can be achieved.
  • the formation according to the invention is particularly suitable, also for web weights 80 g / m2.
  • the device according to the invention can also be used in connection with a multi-layer headbox with targeted detection of the white water. Finally, better retention of the fibers is possible during the dewatering process.
  • the one and the other forming elements are expediently arranged opposite one another on different sides of the twin wire.
  • One forming element can be used for further improvement Suction boxes with a formation shoe (grid) and the other forming elements be pressure strips.
  • the suction boxes can expediently have one, two or more suction zones.
  • the water builds up in the suction box parts, and the vacuum is present above the water surface.
  • the vacuum in the different suction zones can be different. If one looks at the negative pressure curve within a part of the suction box along a section transverse to the drainage strips, the water at the top causes the greatest vacuum and decreases from top to bottom as viewed against the direction of travel of the twin wire. This effect is very favorable because it allows the dewatering effect to be dosed so that at the beginning, where the substance drains more easily, the vacuum applied is lower. This affects the formation favorably. A continuous development of the vacuum can be achieved even with finite subdivision of the suction box.
  • the rear formation zone in the running direction of the twin wire can expediently be longer than the front formation zone. This leads to a particularly gentle formation, in particular when the formation shoe of the suction box at the front in the running direction of the twin wire is expediently not curved, i.e. is essentially straight. As a result, the track is treated gently in the first phase of formation and drainage.
  • the vertical former as is shown schematically in FIG. 1, comprises two screens S1 and S2, which converge to form a twin screen in the region of a nozzle 10 which feeds the suspension.
  • This twin wire passes through a formation section or a formation section 12.
  • the twin wire DS is guided around a forming roller 14.
  • the screen S1 is guided around deflection rollers 16 or at the inlet around a closed breast roller 14 '.
  • This forming roller 14 is designed as an open forming roller.
  • the screen S2 is guided around deflection rollers 16 'or 16'', wherein between the breast roll 14 'and the deflection roll 16''the screens S1 and S2 converge to form the double screen DS.
  • the nozzle 10 is directed into this merging nip in order to introduce the aqueous suspension into the nip where a first dewatering takes place.
  • the formation section 12 or the formation section 12 is here divided into two zones, namely a first forming zone Z1 and a second forming zone Z2, the course of the twin wire DS taking place essentially vertically, with a maximum inclination of 30 ° to the vertical.
  • the first formation zone Z1 is preferably shorter than the second formation zone Z2.
  • several zones can also be provided in succession.
  • a forming element is arranged opposite each other on the opposite ends of the twin wire DS in each zone, namely in the first formation zone Z1 on the right-hand side pressure bars 18, which are preferably elastic and, if necessary, adjustable, elastic to the twin wire or to the Sieve S2 in the area of the double sieve DS are pressed to discharge the extracted water via a discharge box 18 '.
  • a suction box 19 On the opposite side, adjacent to the screen S1, there is a suction box 19 with a formation shoe 19 ', which consists of a lattice-like structure with strips and slits extending across the width, as is known in principle.
  • a suction box 21 with a formation shoe 21 ' lies against the screen S2.
  • a forming element is arranged on both sides of the twin wire DS, the opposite forming elements as pressure strips on the one hand and as suction boxes on the other hand being different forming elements, which are however arranged alternately in the direction of movement of the twin wire DS.
  • the formation shoes 19 ', 21' are straight in FIG. 1.
  • the formation section 12 also takes a straight course between the forming rollers 14 'and 14.
  • the formation section or formation section 12 is drawn out in detail in FIG. 2.
  • the suction box 19 is designed here in one stage with a deflection element 19 ′′ and the suction box 21 in two stages with the deflection elements 21 ′′. A clearer representation of this two-stage suction box 21 with the water accumulation 22 can be seen more clearly in FIG. 5 of the accompanying drawing.
  • 3 and 4 each show a double-wire belt curve curved to the left and to the right in the formation section 12, although the formation shoe 19 'is preferably straight in the first formation stage Z1 in order to be able to carry out a more gentle drainage in the first stage.
  • the formation shoe 21 'straight in the second zone Z2 in which case the two formation stages Z1 and Z2 are arranged at a slight angle to one another.
  • the nozzle 10 is aligned so that it directs the suspension from bottom right to top left into the gap where the screens S1 and S2 converge to form the twin screen DS.
  • the screen S2 is guided around the open forming roller 14 '.
  • a three-stage suction box 26 is shown, with a formation shoe 26 ', which is just formed here.
  • the twin wire belt course is indicated by an arrow 27. From the water levels in the drainage water outlet 28 it can be seen that a higher negative pressure prevails in the uppermost section 29 than in the section 30 below and the section 31 still underneath. This means that the suction pressure in the suction box sections corresponds to the direction of movement 27 from bottom to top increases, which also has a positive influence on gentle drainage with regard to an improved formation taking into account the desired web strength and in particular a uniform web structure.
  • troughs 13 are provided for collecting the water extracted from the forming breast rollers 14 '.
  • Fig. 7 shows an embodiment of a vacuum-operated slit suction device in front of an arrangement of pressure strips 34, which are movable substantially vertically to the screen S in accordance with the arrow 36 in order to change the contact pressure of the strips.
  • the slot suction device 32 consists of an inlet part 40 which can likewise be moved essentially perpendicular to the sieve 6 in accordance with the arrow 38 and which forms a gap 44 with the sieve S which preferably converges in the direction of the arrow 42. In this area, very favorable pre-dewatering takes place through the slot 46 under the action of a vacuum acting in the space 48.
  • the slot 46 preferably runs essentially horizontally in a first section after the gap 44 and then essentially vertically and then arrives in a collecting container 50.
  • a collecting container 52 serves to receive the water removed in the area of the pressure strips 34 via collecting plates 60.
  • a suction box 62 is provided for sub-separation after the open forming roll 14 under the screen S2.

Landscapes

  • Paper (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP91104493A 1990-05-04 1991-03-22 Section de formage vertical Expired - Lifetime EP0454989B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014403 1990-05-04
DE4014403A DE4014403C2 (de) 1990-05-04 1990-05-04 Vertikalformer

Publications (2)

Publication Number Publication Date
EP0454989A1 true EP0454989A1 (fr) 1991-11-06
EP0454989B1 EP0454989B1 (fr) 1995-03-15

Family

ID=6405738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104493A Expired - Lifetime EP0454989B1 (fr) 1990-05-04 1991-03-22 Section de formage vertical

Country Status (4)

Country Link
EP (1) EP0454989B1 (fr)
AT (1) ATE119956T1 (fr)
CA (1) CA2040999A1 (fr)
DE (2) DE4014403C2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504123A1 (fr) * 1991-03-15 1992-09-16 Valmet Paper Machinery Inc. Section de formage à double toile d'une machine à papier
WO1996011734A1 (fr) * 1994-10-14 1996-04-25 Andritz-Patentverwaltungs-Gesellschaft Mbh Dispositif de deshydratation et/ou de lavage de suspensions, notamment de suspensions de matieres fibreuses
US5833809A (en) * 1994-08-31 1998-11-10 Valmet Corporation Twin-wire former
EP1319745A1 (fr) * 2001-12-12 2003-06-18 Voith Paper Patent GmbH Section de formage à deux toiles
US7067042B2 (en) 2001-03-13 2006-06-27 Voith Paper Patent Gmbh Twin wire former
EP1696074A1 (fr) * 2005-02-24 2006-08-30 Voith Paper Patent GmbH Section de formage à deux toiles pour la production d'une bande fibreuse

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
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
DE19652485A1 (de) * 1996-12-17 1998-06-18 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie
FI109299B (fi) * 2001-01-22 2002-06-28 Metso Paper Inc Kaksiviiraformeri
DE102008040948A1 (de) * 2008-08-01 2010-02-04 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2117102A5 (fr) * 1970-11-16 1972-07-21 Escher Wyss Ag
FR2131765A6 (en) * 1971-03-25 1972-11-10 Beloit Corp Vertical paper-making machine - with plastic and metal cloths to form continuous paper web from aq pulp
DE8405243U1 (de) * 1984-02-21 1986-07-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
EP0306759A1 (fr) * 1987-09-07 1989-03-15 Valmet-Ahlstrom Inc. Dispositif de contrôle des toiles dans une machine à papier ou carton
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT327670B (de) * 1970-10-30 1976-02-10 Arledter Hanns F Dr Ing Entwasserungseinrichtung fur eine doppelsieb-papiermaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2117102A5 (fr) * 1970-11-16 1972-07-21 Escher Wyss Ag
FR2131765A6 (en) * 1971-03-25 1972-11-10 Beloit Corp Vertical paper-making machine - with plastic and metal cloths to form continuous paper web from aq pulp
DE8405243U1 (de) * 1984-02-21 1986-07-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
EP0306759A1 (fr) * 1987-09-07 1989-03-15 Valmet-Ahlstrom Inc. Dispositif de contrôle des toiles dans une machine à papier ou carton
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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504123A1 (fr) * 1991-03-15 1992-09-16 Valmet Paper Machinery Inc. Section de formage à double toile d'une machine à papier
US5599427A (en) * 1991-03-15 1997-02-04 Valmet Corporation Twin-wire web former in a paper machine
US5833809A (en) * 1994-08-31 1998-11-10 Valmet Corporation Twin-wire former
WO1996011734A1 (fr) * 1994-10-14 1996-04-25 Andritz-Patentverwaltungs-Gesellschaft Mbh Dispositif de deshydratation et/ou de lavage de suspensions, notamment de suspensions de matieres fibreuses
US5868903A (en) * 1994-10-14 1999-02-09 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Device for dewatering and/or washing suspensions, in particular suspensions of fibrous materials
US7067042B2 (en) 2001-03-13 2006-06-27 Voith Paper Patent Gmbh Twin wire former
EP1319745A1 (fr) * 2001-12-12 2003-06-18 Voith Paper Patent GmbH Section de formage à deux toiles
US7008511B2 (en) 2001-12-12 2006-03-07 Voith Paper Patent Gmbh Wire section
EP1696074A1 (fr) * 2005-02-24 2006-08-30 Voith Paper Patent GmbH Section de formage à deux toiles pour la production d'une bande fibreuse

Also Published As

Publication number Publication date
DE59104927D1 (de) 1995-04-20
DE4014403C2 (de) 1994-03-10
DE4014403A1 (de) 1991-11-07
CA2040999A1 (fr) 1991-11-05
ATE119956T1 (de) 1995-04-15
EP0454989B1 (fr) 1995-03-15

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