EP1370726B1 - Formeur a double toile - Google Patents

Formeur a double toile Download PDF

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Publication number
EP1370726B1
EP1370726B1 EP02708333A EP02708333A EP1370726B1 EP 1370726 B1 EP1370726 B1 EP 1370726B1 EP 02708333 A EP02708333 A EP 02708333A EP 02708333 A EP02708333 A EP 02708333A EP 1370726 B1 EP1370726 B1 EP 1370726B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
guide roll
seen
running direction
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
EP02708333A
Other languages
German (de)
English (en)
Other versions
EP1370726A1 (fr
Inventor
Johann Moser
Volker Schmidt-Rohr
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
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1370726A1 publication Critical patent/EP1370726A1/fr
Application granted granted Critical
Publication of EP1370726B1 publication Critical patent/EP1370726B1/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 twin-wire former of a machine for producing a fibrous web, in particular a paper or board web from at least one pulp suspension, with two continuous endless sieves, which converge to form a Stoffeinlaufspalts which receives a pulp suspension directly from a headbox, and then at least one forming a substantial vertical twin-wire section, in which - seen in Sieblaufraum- the two screens at least one, in the direction of wire direction successively arranged forming unit and dewatering unit, each remove by means of vacuum white water from the pulp suspension between the two screens through the respective sieve pass, each forming unit and each drainage unit consists of at least one zone each.
  • Such a twin-wire former commonly referred to as a vertical former, for example, both from the publications DE 40 14 403 A1 EP 0 454 989 A1 . US-A-5,325,484 . EP 0 369 296 A2 and WO 97/08382 A1 known.
  • the double wire is guided over an open forming roll, which is designed as a wire suction roll. This sieve suction roll has the task of further increasing the dry content in the forming fibrous web.
  • a disadvantage of using a forming roll designed as a suction sieve roller is that it is expensive and above average maintenance-intensive both in terms of acquisition (acquisition costs) and in operation (energy costs for its own drive and for air volumes). Moreover, it is generally equipped with special cleaning systems and causes an increased noise level during operation. From a structural point of view, it represents a heavy assembly for stiffening and, in the case of large machine widths, a deflection-prone assembly for the wire run, whereas from a technological point of view it is critical for perforated shadow markings (fibrous web quality).
  • a deflecting element in the embodiment of a guide roll instead of a wire suction roll and at least one separating suction for screening separation both the acquisition and the energy costs for the twin-wire according to the invention are significantly reduced, and the maintenance intensity of a deflecting element, in particular a guide roller, is significantly lower than that a sieve suction roll.
  • a deflecting element in design Due to its construction, a guide roller can be made significantly more resistant to flexing, as a result of which both the stress for the stiffening and the danger for the wire run are decisively reduced.
  • a deflecting element in the embodiment of a guide roller with an unswept and smooth or almost smooth surface there is only a slight risk of deterioration of the fiber web quality, in particular due to the occurrence of perforated shadow markings.
  • the use of a separating sucker ensures safe separation of the second sieve from the first sieve, on which the fibrous web rests, and, on the other hand, increases the dry content in the fibrous web that forms.
  • the separating sucker by means of at least one controllable / controllable vacuum source with a negative pressure of 10 to 50 kPa, preferably from 15 kPa to 40 kPa, applied, since this both good separation and drying results are achieved.
  • the separating sucker preferably extends over the entire width of the fibrous web and has at least three, preferably six slits with a slit width of less than 20 mm, preferably from less than 15 mm, on.
  • To further increase the dry content in the forming fibrous web is preferably between the guide roller and the separating sucker and / or after the separating sucker -allemal in Sieblaufraum seen- arranged at least ever another flat vacuum.
  • At least one further guide roller with a preferably smaller roller diameter is arranged between the guide roller and the separating suction device-seen in the direction of wire travel.
  • the guide roll is a white water drainage device comprising a collecting and return profile, a deflection profile and a discharge device Derivative exists, assigned.
  • FIG. 1 shows a schematic representation of an embodiment of the invention twin-wire former 10 of a machine for producing a fibrous web 12, which may be in particular a paper or board web of pulp suspension.
  • the twin-wire former 10 comprises two circumferential endless screens 14, 16, which converge to form a material inlet gap 18.
  • the first wire 14 is guided over a breast roll 20 and the second wire 16 via a preferably suctioned forming roll 22.
  • fibrous suspension 28 is introduced by means of a headbox 26 shown schematically from below.
  • the fabric run 26 may be provided in another embodiment with only indicated by dashed lines separating elements (slats) 26.2 in its headbox 26.1.
  • At least substantially vertical Doppelsiebsize 24 pass through the two wires 14, 16 in the direction of wire direction S (arrow) successively arranged forming unit 30.1 and dewatering unit 32.1, each by means of vacuum white water 52.1 from the pulp suspension 28th between the two sieves 14, 16 through the respective sieve 14, 16 remove, wherein the at least one vacuum generating the respective Untertownquetie is not shown.
  • the forming unit 30.1 is arranged in the wire loop of the first wire 14 and consists of two forming zones 30.1 ', 30.1 ", whereas the dewatering unit 32.1 is arranged in the wire loop of the second wire 16 and consists of one Drainage zone 32.1 l .
  • the two units 30.1, 32.1 may have a straight, a curved or a combination of a straight and a curved surface.
  • the forming unit 30.1 has a curved surface.
  • a plurality of forming strips 34 are attached; Reference is made to the known prior art.
  • the forming strips 34 may be resiliently supported and / or firmly supported, in the latter case their position relative to the sieve 16 is adjustable, for example by moving or pivoting.
  • the two screens 14, 16 are guided over a peripheral region 36.1 of a deflecting element 36 in the form of a guide roller 36 with an unswept and smooth or approximately smooth surface 36.2 at the upper end of the at least substantially vertical double-wire section 24 and that at least one separating element 38 ', in particular a separating suction 38 is arranged directly or indirectly after the guide roller 36 -in Sieblaufraum S, which separates the second sieve 16 from the first sieve 14, on which the fibrous web 12 rests.
  • the separating sucker 38 according to the invention is acted upon by means of at least one controllable vacuum source 42 with a negative pressure pu of 10 to 50 kPa, preferably of 15 kPa to 40 kPa. Furthermore, it has at least three, preferably six slots 44 with a slot width of less than 20 mm, preferably less than 15 mm, and preferably extends over the entire width of the fibrous web 12.
  • At least one further guide roller 50 with preferably smaller roller diameter 50.1 than the guide roller 36 is arranged.
  • the twin-wire section 24 drops downwardly after the guide roller 36 at an angle ⁇ of 0 ° to 60 °, preferably 15 ° to 45 °, in the direction of sawing S (arrow).
  • the entrained by the first sieve 14 fibrous web 12 is taken after a short distance to the vacuum cleaner 48 by a felt 52 on a pickup roller 54 and in the press area, not shown, the machine for producing a fibrous web 12, in particular a paper or board machine out.
  • the two screens 14, 16 are then guided back into the region of the material inlet gap 18 via a plurality of deflection rollers 56 and screen tensioning rollers (not shown). During the return of the two screens 14, 16 in the said area, they can also be passed or passed through at least one, not shown, counting to the prior art screen cleaning device per screen 14, 16.
  • FIG. 2 shows a schematic partial view of a further embodiment of the invention Doppelsiebformers 10 of a machine for producing a fibrous web 12, which may in particular be a paper or board web of pulp suspension 28.
  • the deflection element 36 in the form of a guide roller 36 has a white water removal device 52, which consists of a collection and return profile 54, a deflection profile 56 and a discharge device 58 together with the indicated discharge.
  • a white water removal device 52 which consists of a collection and return profile 54, a deflection profile 56 and a discharge device 58 together with the indicated discharge.
  • the deflection 56 so deflected (arrow) so that it flows on the back 54.1 of the collection and return profile 54 in the direction of discharge device 58 (arrow). From there, the white water 52.1 is conveyed by means of the indicated line in a white water (I) container, not shown.
  • the invention provides a twin-wire former of the type mentioned in the introduction, which completely avoids the aforementioned disadvantages of the prior art due to the use of a wire suction roll.

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  • Paper (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (9)

  1. Formeur à double toile (10) d'une machine pour la fabrication d'une bande de matière fibreuse (12), en particulier d'une bande de papier ou de carton à partir d'au moins une suspension de matière fibreuse (28), avec deux toiles sans fin (14, 16) en rotation, qui défilent de concert en formant une fente d'entrée de matière (18) qui reçoit une suspension de matière fibreuse (28) directement d'une caisse de tête (26), et qui forment ensuite une section à double toile (24) au moins essentiellement verticale, dans laquelle - vues dans la direction de défilement des toiles (S) - les deux toiles (14, 16) franchissent au moins chaque fois une unité de formage (30.1) et une unité d'essorage (32.1) disposées l'une derrière l'autre dans la direction de défilement des toiles (S), qui éliminent chacune par dépression l'eau de la suspension de matière fibreuse (28) entre les deux toiles (14, 16) à travers la toile respective (14, 16), dans lequel chaque unité de formage (30.1) et chaque unité d'essorage (32.1) se composent chacune d'au moins une zone (30.1', 30.1", 32.1'), caractérisé en ce que, à l'extrémité supérieure de l'au moins une section à double toile (24) au moins essentiellement verticale, les deux toiles (14, 16) - vues dans la direction de défilement des toiles (S) - sont guidées sur une zone périphérique (36.1) d'un élément de renvoi (36') d'un rouleau de guidage (36) avec une surface sans aspiration et lisse ou approximativement lisse (36.2), et en ce que, indirectement ou directement après le rouleau de guidage (36) - vu dans la direction de défilement des toiles (S) - est disposé au moins un élément de séparation (38'), en particulier un suceur de séparation (38), qui sépare la seconde toile (16) de la première toile (14) sur laquelle repose la bande de matière fibreuse (12).
  2. Formeur à double toile (10) selon la revendication 1, caractérisé en ce que le suceur de séparation (38) peut être soumis à une dépression (pu) de 10 à 50 kPa, de préférence de 15 kPa à 40 kPa, au moyen d'au moins une source de dépression (42) pouvant être commandée/régulée.
  3. Formeur à double toile (10) selon la revendication 1 ou 2, caractérisé en ce que le suceur de séparation (38) comprend au moins trois, de préférence six fentes (44) ayant une largeur de fente inférieure à 20 mm, de préférence inférieure à 15 mm.
  4. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le suceur de séparation (38) s'étend de préférence sur toute la largeur de la bande de matière fibreuse (12).
  5. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un suceur plat (46) est disposé entre le rouleau de guidage (36) et le suceur de séparation (38) - vu dans la direction de défilement des toiles (S).
  6. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un autre rouleau de guidage (50), ayant de préférence un diamètre de rouleau (50.1) plus petit que le rouleau de guidage (36), est disposé entre le rouleau de guidage (36) et le suceur de séparation (38) - vu dans la direction de défilement des toiles (S) .
  7. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins un autre suceur plat (48) est disposé après le suceur de séparation (38) - vu dans la direction de défilement des toiles (S).
  8. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la section à double toile (24) - vue dans la direction de défilement des toiles (S) - descend vers le bas après le rouleau de guidage (36) sous un angle (α) de 0° à 60°, de préférence de 15° à 45°.
  9. Formeur à double toile (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif d'évacuation de l'eau des toiles (52), qui se compose d'un profilé de collecte et de retour (54), d'un profilé de déviation (56) et d'un dispositif d'évacuation (58) avec son évacuation, est associé au rouleau de guidage (36).
EP02708333A 2001-03-13 2002-02-27 Formeur a double toile Expired - Lifetime EP1370726B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20104380U DE20104380U1 (de) 2001-03-13 2001-03-13 Doppelsiebformer
DE20104380U 2001-03-13
PCT/EP2002/002067 WO2002072950A1 (fr) 2001-03-13 2002-02-27 Formeur a double toile

Publications (2)

Publication Number Publication Date
EP1370726A1 EP1370726A1 (fr) 2003-12-17
EP1370726B1 true EP1370726B1 (fr) 2009-08-19

Family

ID=7954257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02708333A Expired - Lifetime EP1370726B1 (fr) 2001-03-13 2002-02-27 Formeur a double toile

Country Status (5)

Country Link
US (1) US7067042B2 (fr)
EP (1) EP1370726B1 (fr)
AT (1) ATE440174T1 (fr)
DE (2) DE20104380U1 (fr)
WO (1) WO2002072950A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412098B (de) * 2002-11-11 2004-09-27 Andritz Ag Maschf Vorrichtung zur trennung einer papierbahn von einem sieb
DE102005020739A1 (de) * 2005-05-04 2006-11-09 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE102008040688A1 (de) * 2008-07-24 2010-01-28 Voith Patent Gmbh Verfahren zur Optimierung der Energiebilanz in Formiereinheiten in Maschinen zur Herstellung von Faserstoffbahnen und Formiereinheit
DE102010041608A1 (de) 2010-09-29 2012-03-29 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn
DE102018121032A1 (de) * 2018-08-29 2019-06-13 Voith Patent Gmbh Verfahren zum entwässern von zellstoff
DE102019122784A1 (de) * 2019-08-26 2021-03-04 Voith Patent Gmbh Former zur Herstellung einer Faserstoffbahn in einer Papiermaschine
AT522459B1 (de) * 2020-01-30 2020-11-15 Andritz Ag Maschf Vorrichtung und verfahren zum herstellen einer faserstoffbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1599376A (en) * 1926-09-07 of akron
SE7507159L (sv) * 1975-06-23 1976-12-24 Karlstad Mekaniska Ab Anordning for framstellning av en fiberbana
JPH02133689A (ja) * 1988-11-14 1990-05-22 Mitsubishi Heavy Ind Ltd 抄紙機ツインワイヤホーマ
DE4014403C2 (de) 1990-05-04 1994-03-10 Escher Wyss Gmbh Vertikalformer
JP2749971B2 (ja) * 1990-07-30 1998-05-13 三菱重工業株式会社 抄紙機の紙層形成装置
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
FI953984A (fi) * 1995-08-24 1997-02-25 Valmet Corp Paperikoneen rainanmuodostusosa

Also Published As

Publication number Publication date
US7067042B2 (en) 2006-06-27
US20040045691A1 (en) 2004-03-11
DE20104380U1 (de) 2001-06-28
EP1370726A1 (fr) 2003-12-17
DE50213783D1 (de) 2009-10-01
ATE440174T1 (de) 2009-09-15
WO2002072950A1 (fr) 2002-09-19

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