EP1749933A2 - Section de formage à deux toiles d'une machine de fabrication d'une bande fibreuse - Google Patents

Section de formage à deux toiles d'une machine de fabrication d'une bande fibreuse Download PDF

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Publication number
EP1749933A2
EP1749933A2 EP06114155A EP06114155A EP1749933A2 EP 1749933 A2 EP1749933 A2 EP 1749933A2 EP 06114155 A EP06114155 A EP 06114155A EP 06114155 A EP06114155 A EP 06114155A EP 1749933 A2 EP1749933 A2 EP 1749933A2
Authority
EP
European Patent Office
Prior art keywords
wire
twin
support box
wire former
screen
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Withdrawn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
EP06114155A
Other languages
German (de)
English (en)
Other versions
EP1749933A3 (fr
Inventor
Christoph Link
Peter Mirsberger
Thomas RÜHL
Jürgen Prössl
Philipp Buchhold
Josef Janzer
Elmer Dr. Weisshuhn
John Sprecher
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 Patent GmbH
Original Assignee
Voith Patent 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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1749933A2 publication Critical patent/EP1749933A2/fr
Publication of EP1749933A3 publication Critical patent/EP1749933A3/fr
Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/36—Guiding mechanisms
    • D21F1/38—Pads
    • 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
    • D21F1/483—Drainage foils and bars
    • 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 of a machine for producing a fibrous web, in particular a paper or board web, from at least one fibrous suspension, with two continuous sieves circulating in respective sieve endless sieves, which at least partially form a Doppelsiebzone, wherein in Sieblaufraum the first sieve before the twin-wire zone a Pre-dewatering section is formed, in which a headbox for applying the at least one pulp suspension to the first sieve and at least one dewatering element for dewatering the at least one applied to the first sieve pulp suspension are arranged.
  • twin-wire former is for example in the German Offenlegungsschrift DE 34 06 217 A1 described.
  • the input side of the twin-wire zone is preferably a separate and height-preferably positionable skimmers in the wire loop of the one, preferably second wire arranged that the Skimmer worn in Sieblaufraum at least one support box for guiding the two sieves with intermediate fiber suspension in the wire loop of the other, preferably first sieve is arranged downstream and that compared to at least one arranged in the wire loop of the other, preferably first sieve support box at least one further preferably separate Skimmer issued in the wire loop of the one, preferably second sieve is arranged.
  • the term "stand-alone" in the present context is independent, both constructive, technological and functional.
  • This embodiment of the twin-wire former according to the invention ensures that even in high-speed machines for producing a fibrous web, in particular a paper or board web, no serious disturbances in the sheet structure of the fibrous web produced occur, regardless of the further structural design of the former. It is particularly advantageous that the emerging from the pulp suspension above white water is removed via at least one Skimmer insightful.
  • the support box is formed of a preferably dense support structure, the upper side and the other, preferably first sieve leading a flexible membrane.
  • the width corresponds to this the support box about the wire width of the other, preferably first sieve and the length of the support box is preferably defined by the drainage possibility up without the use of vacuum.
  • the membrane on top and the other, preferably first sieve leading a surface, with longitudinal grooves, transverse grooves, cross grooves, steps in the wire direction, knobs, sawtooth, blind holes and / or combinations provided the said surface structures.
  • the membrane can moreover consist of a plastic cloth with at least one fiber insert, a plastic plate or a metal and also be designed such that it can pass a lubricant medium from the support box. The membrane is thus permeable.
  • the support box is sectioned in a preferred manner in the wire direction by means of at least one bulkhead and thus divided into individual support box chambers.
  • the bulkhead wall primarily serves to guide and support the sieve guided past it and it can be fixed or adjustable, preferably height-adjustable or adjustable in Sieblaufraum attached. This allows an optimal influence on the dewatering process of the pulp suspension with the greatest possible application flexibility.
  • the bulkhead is preferably provided with means for delivering pulses to the membrane, thereby further enhancing drainage capability.
  • the bulkhead is preferably preferably connected on all sides sealing with the membrane and the support box, wherein in the support box chambers also different pressures can be adjusted.
  • adjacent support box chambers are preferably connected to one another via throttles and an inflow of at least one preferably pulsating pressure medium at least in the last in Sieblaufraum support box chamber is provided to thereby produce sloping chamber pressures against the wire direction.
  • at least one fluid in particular a liquid, a gas or a medium with a controllable swelling, is provided as the pressure medium. All these properties in turn support the provision of gentle dewatering of the pulp suspension.
  • the membrane is preferably supported by the at least one bulkhead and / or by at least one bar extending transversely to the direction of the screen. This ensures, inter alia, a defined dewatering geometry in the initial region of the twin-wire zone.
  • the support box has in a further preferred embodiment on the upper side a radius of curvature in the range of 10,000 mm to infinity, preferably from 5,000 to 500 mm, on which it may also have a surface profile on the upper side, whose contour is provided with inflection points. This creates the possibility of generating a wire tension that aids the dewatering process.
  • the support box can be aligned in any orientation, in particular sloping, horizontal or rising, with respect to the horizontal. With regard to a maximum range of applications, it is furthermore preferably mounted longitudinally and / or vertically adjustable.
  • the support box in a favorable manner by means of at least one shaking device in preferably all three Shaking spatial directions, with such a shaking device including shaking, for example, from the German patent application DE 197 04 730 A1 is known.
  • an endless fabric strip circulating in a wire loop may be provided between the support box and the other, preferably first wire.
  • the fabric strip here is basically a sieve, which is particularly suitable for receiving and discharging emerging from the pulp suspension white water, that is used for volume storage, and is also used to reduce wear.
  • the support box can be provided with external guide rails, similar to a yoke of a NipcoFlex roller.
  • the one, preferably second, sieve can moreover be guided over an inlet roller before it enters the twin-wire zone, which is shaken and / or provided with a surface structure, in particular knobs or the like. As a result, further impulses for improved drainage are introduced into the drainage system.
  • the support box arranged in the wire loop of the other, preferably first screen is followed by a further support box in the wire loop of the one, preferably second wire and that against the arranged in the wire loop of one, preferably second wire further support box at least one further preferably separate skimmer device is arranged in the wire loop of the other, preferably first, wire.
  • FIG. 1 shows a schematic and partial side view of a twin-wire former 1 of a machine for producing a fibrous web, in particular a paper or board web, from at least one pulp suspension 2.
  • the twin-wire former 1 has two endless sieves 3, 4 circulating in respective sieve loop 5, 6, which at least partially form a double-wire zone 7.
  • a pre-dewatering section 8, in which a headbox 9 for applying the at least one pulp suspension 2 to the first wire 3 and a dewatering element 10 for dewatering of the first sieve 3 (Tragsieb, Untersieb) is formed before the twin-wire zone 7 in Sieblaufraum S (arrow) at least one applied on the first screen 3 pulp suspension 2 are arranged.
  • the dewatering element 10 is known to be a screen table or a support table. Following the drainage element 10 in the direction of the wire run S (arrow), a support strip 32 is arranged.
  • twin-wire zone 7 On the input side of the twin-wire zone 7 is a stand-alone and height-preferably positionable Skimmer adopted 11 in the wire loop 6 of the second sieve 4 (outer sieve, upper sieve) arranged in the wire direction S (arrow) turn a support box 12 in the wire loop 5 of the first sieve. 3 is subordinate. And compared to the arranged in the wire loop 5 of the first screen 3 support box 12 two single skimmers 13 are arranged in the wire loop 6 of the second screen 4.
  • the support box 12 is formed from a preferably dense support structure 14, the top side and the first wire 3 leading a flexible membrane 15 has.
  • the width B (arrow) of the support box 12 corresponds approximately to the wire width of the first wire 3 and the length L of the support box 12 is preferably defined by the possibility of dewatering upwards without the use of vacuum.
  • the membrane 15 is supported by a plurality of transversely to the wire direction S (arrow) extending strips 34.
  • the membrane 15 has on the upper side and the first wire 3 leading a surface 16 which is provided with longitudinal grooves, transverse grooves, cross grooves, steps in the wire direction, knobs, sawtooth, blind holes and / or combinations of said surface structures. Furthermore, the membrane 15 may consist of a plastic cloth with at least one fiber insert, a plastic plate or a metal.
  • the membrane 15 is designed such that it can pass a lubricant 17 from the support box 12. So it is permeable.
  • the support box 12 in turn has on the upper side a radius of curvature R K (arrow) in the range of 10,000 mm to infinity, preferably of 5,000 to 500 mm, and a surface profile 18 whose contour 19 with turning points 20 is provided on.
  • R K radius of curvature
  • the support box 12 in any orientation, in particular sloping, horizontal or rising, with respect to the horizontal H (double arrow) alignable and longitudinally and / or height adjustable attached.
  • the support box 12 can be shaken by means of at least one, not shown, the skilled person, however, known shaking device in preferably all three spatial directions.
  • the second wire 4 is guided before its entry into the twin-wire zone 7 via an inlet roller 21, which is shaken and / or provided with a surface structure 22, in particular knobs 22.1 or the like.
  • FIG. 2 now shows a further schematic and fragmentary side view of a twin-wire zone 7 of a twin-wire former 1 according to the invention.
  • the illustrated support box 12 is preferably a development of the support box 12 shown in FIG. 1, so that reference is further made in principle to its description.
  • the support box 12 is sectioned in Sieblaufraum S (arrow) by means of four bulkheads 23.1 to 23.4 and thus divided into individual support box chambers 24.1 to 24.5, wherein the bulkheads 23.1 to 23.4 also support the membrane 15 simultaneously.
  • strips could be provided to support the membrane 15.
  • the respective bulkhead 23.1 to 23.4 is fixed or adjustable, preferably height-adjustable or adjustable in the wire direction S (arrow), attached. The adjustment directions are shown by way of example on the bulkhead 23.1 by means of directional arrows.
  • the bulkheads 23.1 to 23.4 are sealingly connected on all sides with the membrane 15 and the support box 12, so that in the support box chambers 24.1 to 24.5 different pressures p 24.1 to p 24.5 are adjustable and so that the membrane 15 is supported by each bulkhead 23.1 to 23.4.
  • the pressures p 24.1 to p 24.5 are in a known manner with vacuum sources not explicitly shown produced.
  • adjacent support box chambers 24.1 to 24.5 are connected to each other via throttles 25.1 to 25.4, wherein only one throttle per bulkhead is shown by way of example.
  • an inflow of at least one preferably pulsating pressure medium 26 is provided at least in the last direction in the wire direction S (arrow) support box chamber 24.5, thereby decreasing chamber pressures p 24.1 to p 24.5 against the wire direction S (arrow) to produce.
  • the Sauerkastenhunt 24.1 a flow 33 (arrow) for the recirculation.
  • a fluid in particular a liquid, a gas or a medium with a controllable swelling, is provided as the pressure medium 26 (arrow).
  • each medium can be provided as a printing medium, as long as it meets the requirements imposed during operation.
  • the support box 12 both on the inlet side and a respective strip 27.1, 27.2, in particular depending on a sealing strip of known design and known operation on.
  • at least one bulkhead may be provided with means for delivering pulses to the membrane 15.
  • the means may be, for example, structures, in particular elevations.
  • the fabric strip 28 is in principle a screen, which is particularly suitable for receiving and discharging emerging from the pulp suspension 2 white water.
  • the support box 12 may be provided with outer guide rails, similar to a yoke of a NipcoFlex roller.
  • FIG. 3 shows a schematic side view of a twin-wire zone 7 of a twin-wire former 1, as it may look, for example, as an extension of the embodiments of FIGS. 1 and 2.
  • the complete Doppelsiebzone 7 is the arranged in the wire loop 5 of the first screen 3 support box 12 together with the opposite and stand-alone Skimmer issued 11 another support box 30 in the wire loop 6 of the second wire 4 and opposite to the disposed in the wire loop 4 of the second screen 6 further support box 30, another single skimmer device 31 is arranged in the wire loop 5 of the first wire 3.
  • the properties of the support box 30, such as the structure and function, are preferably identical to those of the support box 12. The same is preferably true for the separate Skimmer issueden 11, 13 and 31. Of course, the specified order and arrangement of the support box 12 and 31 together stand alone Skimmer wornen 13, 31 also be mutually.
  • the pre-dewatering section 8 of the twin-wire former 1 has a dewatering element 10 for dewatering the at least one fibrous suspension 2 applied to the first wire 3.
  • the dewatering element 10 is known to be a screen table or a support table. Following the drainage element 10 in the direction of the wire run S (arrow), a support strip 32 is arranged.
  • one sieve may be the second sieve 4 and the other sieve may be the first sieve 3.
  • one sieve may also be the first sieve 3 and the other sieve may be the second sieve 4.
  • twin-wire former of the type mentioned above is provided by the invention, which allows an upwardly directed, gentle and increased drainage of the introduced pulp suspension as early as possible after the at least one arranged in the pre-dewatering zone drainage element.

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EP06114155A 2005-08-05 2006-05-18 Section de formage à deux toiles d'une machine de fabrication d'une bande fibreuse Withdrawn EP1749933A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510037645 DE102005037645A1 (de) 2005-08-05 2005-08-05 Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1749933A2 true EP1749933A2 (fr) 2007-02-07
EP1749933A3 EP1749933A3 (fr) 2007-06-13

Family

ID=37311905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114155A Withdrawn EP1749933A3 (fr) 2005-08-05 2006-05-18 Section de formage à deux toiles d'une machine de fabrication d'une bande fibreuse

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EP (1) EP1749933A3 (fr)
DE (1) DE102005037645A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406217C1 (de) 1984-02-21 1985-10-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
DE19704730A1 (de) 1997-02-07 1998-08-13 Voith Sulzer Papiermasch Gmbh Schüttelvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3830683A1 (de) * 1987-10-30 1989-05-11 Escher Wyss Gmbh Doppelsiebformer
FI84637C (fi) * 1988-12-01 1991-12-27 Valmet Paper Machinery Inc Foerfarande och anordning vid formning av pappers- eller kartongbana.
BR9207154A (pt) * 1992-08-19 1995-12-12 Beloit Technologies Inc Aparelho para formação de tira com múltiplas dobras
DE4229184A1 (de) * 1992-09-02 1993-01-14 Voith Gmbh J M Nasspartie einer papiermaschine
DE10350758A1 (de) * 2003-10-30 2005-06-02 Voith Paper Patent Gmbh Verfahren und Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406217C1 (de) 1984-02-21 1985-10-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
DE19704730A1 (de) 1997-02-07 1998-08-13 Voith Sulzer Papiermasch Gmbh Schüttelvorrichtung

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EP1749933A3 (fr) 2007-06-13
DE102005037645A1 (de) 2007-02-08

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