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WO1989004397A1 - Dispositif de formation a deux toiles - Google Patents

Dispositif de formation a deux toiles Download PDF

Info

Publication number
WO1989004397A1
WO1989004397A1 PCT/DE1988/000570 DE8800570W WO8904397A1 WO 1989004397 A1 WO1989004397 A1 WO 1989004397A1 DE 8800570 W DE8800570 W DE 8800570W WO 8904397 A1 WO8904397 A1 WO 8904397A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
chambers
shaper according
wire
counter surface
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.)
Ceased
Application number
PCT/DE1988/000570
Other languages
German (de)
English (en)
Inventor
Alfred Bubik
Hans Dahl
Otto Hildebrand
Rüdiger KURTZ
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss 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 filed Critical Sulzer Escher Wyss GmbH
Publication of WO1989004397A1 publication Critical patent/WO1989004397A1/fr
Priority to FI893164A priority Critical patent/FI893164A7/fi
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • 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 according to the preamble of claim 1.
  • a device in which a pressure produced by mechanical means acts on the bottom sieve with the top sieve attached, whereby the substance suspension between the sieves is dewatered.
  • the sieves and the suspension are pressed against a fixed counter surface.
  • the pressure-transmitting means are designed as rigid elements and can be individually adjusted in the pressing direction. Floats or compressed air balls can be used for pressing on.
  • DE-PS 31 53 305 means are shown, e.g. Strips that e.g. Transfer contact pressure to the suspension layer using spring forces, a cloth or directly via a sieve. A similar arrangement is also known from DE 35 03 242 A1.
  • pressing elements or the sieve or a belt are exposed to wear.
  • the pressing elements e.g. the strips lie and work evenly across the width of the machine.
  • the pressure gradation required by the spatial expansion of the pressing elements cannot be carried out fine enough, provided that they are solids. The others - like the floats mentioned - can easily get stuck.
  • the properties of the applied fluids which are also lubricants, prevent wear of the agents used.
  • Fig. 14 shows an advantageous embodiment with an additional drainage section.
  • FIG. 1 shows the dewatering zone of a twin wire former.
  • the suspension comes from the headbox in the direction of the arrow between the lower sieve 9 and the upper sieve 10 into the dewatering zone, which is provided between a system 2 of pressure chambers a, b, c, d below and a counter surface 1, above, so to speak a guide surface.
  • the pressure chambers a, b, c, d of the system 2 are open at the top against a circulating belt 8. This is impermeable, because in this case you do not want that to
  • REPLACEMENT BLADE Pressure transmission applied fluid here eg water; penetrates into the suspension to be dewatered through the lower sieve 9.
  • the individual chambers a, b, c, d or a larger number of chambers are subjected to different, preferably ever increasing, pressures in the direction of travel.
  • the suspension is thereby subjected to a pressure, the liquid being pressed out of the suspension.
  • This liquid is pressed up through the top sieve 10 and a perforated counter surface 1 into a receiving device 3 with collecting chambers 3 a, 3 b, 3 c, from which it is removed.
  • The. Counter surface 1 can be pivoted about a pivot point A with the device 3. This means that the clear width S- j at the inlet to the drainage zone is adjusted according to the height of the suspension layer.
  • the arrangement of the pivot point A over the gap with the clear width S 2 on the outlet side of the drainage zone also has an advantage. When S- j changes, the distance S 2 remains constant and does not need to be readjusted. ,
  • the device 3 can also be adjusted in height with the counter surface 1 to adapt to the respective height of the suspension layer.
  • damping parts 5 are attached at the individual chambers a, b, c, d damping parts 5 . They are made of elastic material, or they are supported elastically by suitable hydraulic, pneumatic or electromagnetic supports. The gasket stiffness is lubricated from the inside by the pressure medium, whereby hydrostatic or hydrodynamic effects are exploited.
  • the pressure of the liquid can be so effective that a vacuum in the receptacle 3 can be largely dispensed with. This has the advantage of saving the amount of air to be extracted, thus also saving energy.
  • the band 8 can be provided with various surface structures.
  • Grooves or other liquid leading to the side under the lower sieve 9 can also be structures or patterns leading away here. It can also be designed so that it is suitable for absorbing water.
  • the separating roller 6 is advantageously arranged almost below the receiving device 3.
  • the band 8 is ", if necessary, also at the chambers A, B, c, d, side facing the sealing -unter spanden structures provided.
  • Reference number 4 denotes a deflection roller which guides the top wire 10.
  • System 2 is one to that previously described. Reverse arrangement shown. System 2 with the pressure box is at the top - above the top sieve - and a perforated, permeable counter surface 1 is to be arranged at the bottom.
  • the counter surface 1 with the collecting device is concave, and the system 2 has a complementary convex curvature.
  • a curved drainage zone is also shown in FIGS. 5 and 6. 6, the curvature has a polygon shape.
  • a gaseous fluid e.g. Air or water vapor led into the pressure chambers of the system 2.
  • the belt 8 can be omitted, which simplifies the construction of the machine and reduces wear.
  • FIG. 1 An arrangement of a headbox 11 in front of the dewatering zone is also shown in FIG. A downstream separating roller is designated 15.
  • the machine according to FIG. 3 has a first headbox 11, furthermore 9 drainage strips 13 are attached in the running direction under the lower sieve.
  • a second headbox 12 is provided just before the dewatering zone. The suspension jet of this second headbox hits the position of the first suspension above the
  • the drainage zone or the former is otherwise designed as shown in FIG.
  • the machine according to Fig. 4 has one. first headbox 11 with subsequent dewatering elements 13 under the lower sieve 9.
  • a second headbox 12 is arranged in front of the dewatering zone with a system 2 with pressure chambers at the top and a receiving device 3 at the bottom.
  • the band 15, which is located between the lower sieve 9 and a perforated counter surface 1, is also permeable. Further dewatering takes place by spraying on the separating roller 6 and on the further suction box system 22.
  • a circular curvature of the drainage pipe is provided.
  • the system 2 with the pressure chambers is provided under the lower sieve 9.
  • the collecting device 3 with the counter surface 1 is arranged at the top.
  • the water absorbed in the upper structure of the impermeable band 8 is thrown into a collecting container 16.
  • Below another Saugkaste ⁇ system 17 ⁇ is provided below another Saugkaste ⁇ system 17 ⁇ is provided.
  • a spin effect is also present in the former with a polygonal curvature according to FIG. 6.
  • System 2 is also located below.
  • the collecting device 3 with a perforated counter surface 1 is arranged above the suspension layer to be drained.
  • FIG. 7 shows a system 2 with pressure chambers which can be charged with gaseous fluid.
  • the band 8 is permeable to the fluid.
  • System.2 according to FIG. 8 has hydrostatic pressure chambers which are acted upon by a pressure fluid via lines 21.
  • An example of a pressure chamber is shown in Fig. 11 with holes 19 or slots.
  • the system 2 is supported in a height-adjustable manner.
  • the tape .8 is impermeable. , , •
  • hydrostatic pressing elements, supporting elements 20 are used. These preferably have a last shape.
  • the strips run under an impermeable band 8 transversely to the machine running direction. They are vertically displaceable in their support and are acted upon by a pressure fluid via lines 21.
  • the pressure chambers are hydrodynamically acting wedges 24.
  • the liquid required for the formation of the wedges is introduced into the chambers from the pressure medium or via splashes 23.
  • the support shoes 25 are adjustable in height.
  • FIG. 12 shows a section of the system 2 'with elastic pressure-generating elements (a ' , ...), which in the example can be filled with a pressure medium and hydrodynamically lubricated against the circulating belt 8 by a medium emerging from the rectangular tube 23 ' are. Wear-resistant and friction-reducing flexible foils. 26 can also be attached.
  • FIG. 14 shows a former with a drainage section lying directly behind the headbox, as seen in the direction of flow, which is particularly gentle

Landscapes

  • Paper (AREA)

Abstract

Dans le dispositif de formation à deux toiles pour machine à papier ou à carton, une suspension pâteuse provenant de la caisse de tête est guidée entre une toile inférieure (9) et une toile supérieure (10). Des dispositifs agissent sur les toiles contre une contre-surface (1) opposée afin d'exprimer le liquide contenu dans la suspension pâteuse. La pression nécessaire peut être appliquée au moyen d'un système (2) à chambres de pression (a, b, c, d) débouchant contre la contre-surface (1) et soumises à l'action d'un fluide sous pression, ou bien à éléments élastiques sur lesquels peuvent être formées des couches de fluide. Dans un mode de réalisation, une bande (8) tournant avec les toiles (9, 10) est disposée le long des ouvertures des chambres (a, b, c, d), ladite bande (8) étant perméable ou imperméable au fluide agissant dans ces dernières.
PCT/DE1988/000570 1987-10-30 1988-09-15 Dispositif de formation a deux toiles Ceased WO1989004397A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI893164A FI893164A7 (fi) 1987-10-30 1989-06-28 Dubbelviraformare.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH426587 1987-10-30
CH4265/87-0 1987-10-30

Publications (1)

Publication Number Publication Date
WO1989004397A1 true WO1989004397A1 (fr) 1989-05-18

Family

ID=4272901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000570 Ceased WO1989004397A1 (fr) 1987-10-30 1988-09-15 Dispositif de formation a deux toiles

Country Status (4)

Country Link
EP (1) EP0340252A1 (fr)
DE (1) DE3830683A1 (fr)
FI (1) FI893164A7 (fr)
WO (1) WO1989004397A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371786A3 (fr) * 1988-12-01 1990-11-22 Valmet-Karhula Inc. Procédé et dispositif de formation de bandes continues
EP0438681A1 (fr) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Dispositif de déshydratation pour une section de formage à deux toiles
EP0607549A1 (fr) * 1993-01-18 1994-07-27 J.M. Voith GmbH Procédé pour mettre en oeuvre une partie humide et dispositif pour l'application du procédé
WO1995011338A1 (fr) * 1993-10-16 1995-04-27 Beloit Technologies, Inc. Appareil de formage d'une bande a partir de pate a papier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929265C2 (de) * 1989-09-02 1997-05-07 Voith Sulzer Papiermasch Gmbh Leiste für Blattbildungszone einer Papiermaschine
FI100542B (fi) * 1993-11-12 1997-12-31 Valmet Paper Machinery Inc Paperikoneen hybridiformeri, joka on varustettu MB-yksiköllä
DE102005037645A1 (de) * 2005-08-05 2007-02-08 Voith Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058519A (en) * 1959-10-19 1962-10-16 Herbert H O Weiser Means of presenting gas pressure to a surface
DE1461145A1 (de) * 1965-08-30 1968-12-05 F Oberorfer Metalltuchfabrik F Entwaesserungseinrichtung fuer Langsiebmaschinen zum Herstellen von Faserstoffbahnen
US3657069A (en) * 1969-12-18 1972-04-18 Robert R Candor Method and apparatus for treatment of sheet-like material
FR2219836A1 (fr) * 1973-03-01 1974-09-27 Escher Wyss Sa
GB2174120A (en) * 1985-04-26 1986-10-29 Doerries Gmbh Twin wire guiding apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105575A1 (en) * 1971-02-06 1972-08-10 Belt press - for plastic flow materials in continuous strip
DE3153305C2 (de) * 1981-09-04 1986-10-23 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
DE3406217C1 (de) * 1984-02-21 1985-10-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
DE3503242A1 (de) * 1985-01-31 1986-08-07 O. Dörries GmbH, 5160 Düren Vorrichtung zum fuehren der siebe einer doppelsiebpartie einer papier- oder kartonmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058519A (en) * 1959-10-19 1962-10-16 Herbert H O Weiser Means of presenting gas pressure to a surface
DE1461145A1 (de) * 1965-08-30 1968-12-05 F Oberorfer Metalltuchfabrik F Entwaesserungseinrichtung fuer Langsiebmaschinen zum Herstellen von Faserstoffbahnen
US3657069A (en) * 1969-12-18 1972-04-18 Robert R Candor Method and apparatus for treatment of sheet-like material
FR2219836A1 (fr) * 1973-03-01 1974-09-27 Escher Wyss Sa
GB2174120A (en) * 1985-04-26 1986-10-29 Doerries Gmbh Twin wire guiding apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371786A3 (fr) * 1988-12-01 1990-11-22 Valmet-Karhula Inc. Procédé et dispositif de formation de bandes continues
EP0438681A1 (fr) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Dispositif de déshydratation pour une section de formage à deux toiles
EP0607549A1 (fr) * 1993-01-18 1994-07-27 J.M. Voith GmbH Procédé pour mettre en oeuvre une partie humide et dispositif pour l'application du procédé
WO1995011338A1 (fr) * 1993-10-16 1995-04-27 Beloit Technologies, Inc. Appareil de formage d'une bande a partir de pate a papier
CN1039931C (zh) * 1993-10-16 1998-09-23 贝洛特工艺技术公司 一种由纸浆制取纸幅的成型装置

Also Published As

Publication number Publication date
FI893164A0 (fi) 1989-06-28
EP0340252A1 (fr) 1989-11-08
DE3830683A1 (de) 1989-05-11
FI893164A7 (fi) 1989-06-28

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