EP2072677B1 - Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse - Google Patents

Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse Download PDF

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Publication number
EP2072677B1
EP2072677B1 EP08165980A EP08165980A EP2072677B1 EP 2072677 B1 EP2072677 B1 EP 2072677B1 EP 08165980 A EP08165980 A EP 08165980A EP 08165980 A EP08165980 A EP 08165980A EP 2072677 B1 EP2072677 B1 EP 2072677B1
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EP
European Patent Office
Prior art keywords
wire
forming
blade
twin
suction box
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EP08165980A
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German (de)
English (en)
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EP2072677A1 (fr
Inventor
Thomas RÜHL
Moritz Schmalenbach
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2072677A1 publication Critical patent/EP2072677A1/fr
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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

  • the invention relates to a twin-wire former for a machine for producing a fibrous web from at least one pulp suspension, with two rotating endless screens, of which the first wire runs over a peripheral region of a forming roller and the second wire runs over a peripheral region of a breast roll and then in the region of the forming roller on the first sieve to form a wedge-shaped material inlet gap, which receives at least one pulp suspension immediately from a headbox, and then the two screens with the at least one fibrous suspension between them then at least partially form a twin-wire zone and thereby initially in the forming roll on the Forming roller formed by the initial drainage region with an initial dewatering length, wherein in the area of the twin-wire zone and each other of the forming a Formiersauger with a preferably curved Forming surface is arranged, which consists of a plurality of spaced-apart and rigidly arranged strips, over which the two wires are guided with the at least one fibrous suspension between them, and which forms at least one can be acted upon in the
  • Such a twin-wire former with a mutual arrangement of forming roller and Formiersauger is for example from the European patent application EP 1 233 105 A2 known.
  • the suctioned in a known manner forming roller exerts a vacuum effect on the at least one located between the two screens pulp suspension.
  • the at least one formation strip arranged between two adjacent strips of the forming fabric has a fixed distance from the leading edge of the first rigidly arranged strip, so that there is no dependence on the forming angle, on the sort of the at least one fiber suspension or on the wire speed.
  • the fixed distance in such a twin-wire former nowadays assumes a value of about 400 mm.
  • And in the area from the leading edge of the first rigidly arranged strip of Formiersaugers to the first formation bar usually eight or more rigidly arranged strips of Formiersaugers are arranged.
  • the mutually of the Formiersaugers arranged formation strips are to influence the positive after the formation of the two edge layers in the fibrous web to be produced core of the fibrous web in its properties.
  • pressure pulses are introduced through the contactable formation strips into the at least one pulp suspension.
  • the corresponding edge layers in the fibrous web to be produced are formed in the preceding elements up to the first compressible formation strip, the so-called counter-strip.
  • the preceding elements are, on the one hand, the dewatering section from the beginning of the first forming shoe to the first opposite counter strip and the forming roller arranged in front of the first dewatering box.
  • the latter element has a certain angle of wrap, in the angular range, the two wires wrap around the roller together.
  • the joint wrap length and thus the intensity of the drainage on the forming roll can be determined. This is necessary in order to adapt the process-technically correct pre-dewatering on the forming roller to the dewatering behavior of the respective raw material. This correct adaptation of the pre-dehydration ensures that the desired state of the fibrous web, as described above, with liquid core and already formed edge layers in the fibrous web to be produced in the region of the compressible counter ledges for the respective boundary conditions and grade requirements, such as basis weight, wire speed and the like , is achieved.
  • the dewatering section which likewise belongs to the pre-dewatering section, on the first suction element up to the first pressureable counter strip is essentially not changed or not adapted.
  • This described loop length is in the range of 400 mm in such modern sheet forming systems with a Formierwalzen bemesser of about 1,600 mm.
  • the disadvantage here is that in an adaptation of the wrap angle on the forming roller to the dewatering conditions as described above, the ratio of the dewatering length at the variable forming roll wrap to the fixed first section at the first suction box changes. As a result, the possibility of a process-technically ideal control of the above-described necessary edge layers in the fibrous web to be produced is markedly limited.
  • optimum control in particular other parameters, such as the properties of the raw material used, the wire speed and the weight per unit area of the fibrous web to be produced, can be taken into account within the framework of the geometric possibilities.
  • the ratio between the initial dewatering length of the initial dewatering area formed on the forming roller and the distance of the first formation strip from the leading edge of the first rigidly arranged strip of the forming dipper is in the range of 1 , 2 to 2.4, preferably from 1.4 to 2.2, in particular from 1.7 to 2.0, assumes.
  • the double-wire former according to the invention allows optimum control of the two edge layers with the given ratios, in particular with regard to the fine and filler distribution in the z-direction, in the fibrous web to be produced and thus a far-reaching, preferably even complete avoidance of the disadvantages of the known sheet-forming systems.
  • other parameters such as the properties of the raw material used, the wire speed and the weight per unit area of the fibrous web to be produced, can also be taken into account within the framework of the geometric possibilities.
  • twin-wire former according to the invention makes it possible to achieve a better formation and two-sidedness control in wood-free fibrous webs or at smaller initial drainage lengths in the initial drainage area.
  • any other varieties can be driven with the twin-wire former according to the invention.
  • the initial drainage area with an initial drainage length is by definition the area on the forming roll in which the two screens are guided jointly with the at least one fibrous suspension between them over the forming roll.
  • the forming zone known to those skilled in the art and having a forming angle is usually formed.
  • the theoretical initial drainage area and the operational, that is to say the actual, initial drainage area, the angle difference between them assuming a value between 3 and 5 °, depending on the height of the introduced pulp suspension layer.
  • the theoretical initial drainage area describes the situation without introduced pulp suspension layer, whereas the operational, that is the actual initial drainage area describes the situation with incorporated pulp suspension layer.
  • a forming zone with a forming angle ⁇ 30.0 °, preferably ⁇ 27.0 °, in particular ⁇ 24.0 °, and a preferably controllable / controllable area in the area of the initial dewatering area formed on the forming roller Aspiration is formed.
  • this Formierzone so formed additionally supports the drainage of at least one introduced pulp suspension. Moreover, it favors bilateral drainage of the at least one incorporated pulp suspension in the initial drainage area.
  • the forming roll preferably has a forming roll diameter in the range from 1,400 to 2,000 mm, preferably from 1,475 to 1,950 mm, in particular from 1,525 to 1,800 mm, on.
  • a Formierwalzen penmesser also allows a gentle drainage of at least one introduced pulp suspension.
  • the distance of the first formation strip from the leading edge of the first rigidly arranged strip of Formiersaugers is preferably ⁇ 400 mm, preferably ⁇ 350 mm, in particular ⁇ 300 mm.
  • This distance dimension promotes a uniform and bilateral drainage of at least one pulp suspension by reducing only one-sided dewatering lengths.
  • the specified and distance measure also allows the realization of a compact size with no technological disadvantages.
  • the distance of the at least one formation strip from the leading edge of the first rigidly arranged strip of Formiersaugers is preferably adjustable, so that the above and inventive ratio in the range of 1.2 to 2.4, preferably from 1.4 to 2.2, in particular from 1.7 to 2.0, can be realized.
  • the adjustment of the distance is preferably carried out during a standstill of the twin-wire former.
  • At least two, preferably arranged at least three formation strips opposite the Formiersauger wherein at least one formation strip opposite the first forming zone of the Formiersaugers and at least one further formation strip is preferably arranged opposite the second forming of the Formiersaugers.
  • the at least two, preferably at least three, formation strips preferably have a mutual spacing in the range from 50 to 300 mm, preferably from 80 to 250 mm, in particular from 100 to 200 mm.
  • the only one-sided dewatering lengths are reduced in the range of Doppeltelsiebformers are in the range of the leading edge of the first rigidly arranged bar of Formiersaugers to the first formation bar preferably ⁇ 8 rigidly arranged strips of Formiersaugers, preferably ⁇ 6 rigidly arranged strips of Formiersaugers, in particular ⁇ 5 rigidly arranged strips of Formiersaugers arranged.
  • the strips of the Formiersaugers preferably have a respective strip width in the range of 5 to 90 mm, preferably from 8 to 60 mm, in particular from 10 to 40 mm.
  • the first strip of Formiersaugers in a preferred embodiment, a greater strip width than the subsequent her Sieblaufraum strips, whereby an improved initial support of the twin-wire zone in the Formiersaugers is guaranteed.
  • the at least one formation strip for resilient support of the first screen in the region of a twin-wire zone comprises a movable head strip which extends transversely to the wire direction and over which at least partially the wire slides during operation of the machine, a movable support bar which is rigid with the movable head strip is connected and which also extends transversely to the wire direction and is guided in a fixed structure, a fixed guide bar which is rigidly arranged in the fixed structure and which in turn extends transversely to the wire direction, a resilient pressing device which is between the movable support bar and the fixed guide rail is arranged to the movable support bar together with the movable header between a rest position and an operative position in which the movable header is pressable with a selectable force on the screen, and a resilient return means for supporting the movable support bar together with the movable header from the operating position to the rest position and the attitude of the two strips in the rest position wherein the resilient return means distributed over the length of the movable support bar has a plurality
  • This formation strip is characterized, inter alia, by the fact that their positions, in particular the operating and the rest position, can be produced and operated reliably with significantly less force.
  • the return mechanism of the strip is largely without any influence on its postural forces in its operating position.
  • the already mentioned Siebhardsentskysstation is positively supported if at least one sieve, preferably the first sieve, a sieve tension in the range of 5 to 20 N / m, preferably from 8 to 14 N / m.
  • the twin-wire former according to the invention is also particularly suitable for use in a machine for producing a fibrous web from at least one fibrous stock suspension.
  • FIG. 1 shows a schematic partial view of the initial portion of a twin wire former 1 for a machine for producing an at least single-layer fibrous web 2 from a pulp suspension 3.
  • the fibrous web may of course also be a multilayer fibrous web, provided that at least two pulp suspensions are used with their preferably different quality for their production.
  • the twin-wire former 1 comprises two continuous endless screens, namely a first screen 4, which runs over a peripheral region 7 of a forming roller 6, and a second screen 5, which runs over a peripheral region 9 of a breast roller 8.
  • the two wires 4, 5 are also referred to as upper and lower wire or as outer and inner wire.
  • At least one sieve 4, 5, preferably the first sieve 4 has a sieve tension P in the range from 5 to 20 N / m, preferably from 8 to 14 N / m.
  • the second wire 5 passes after its expiration of the breast roll 8 in the region of the forming roller 6 on the first wire 4 to form a wedge-shaped Stoffeinlaufspalts 10 which receives the pulp suspension 3 directly from a headbox 11 on.
  • the two screens 4, 5 with the fibrous suspension 3 between them form at least in sections a double-wire zone 12.
  • the twin-wire zone 12 can take a vertical or approximately vertical, an oblique or even a horizontal or approximately horizontal course. In the present embodiment, it takes an approximately vertical course.
  • the two sieves 4, 5 thus form a so-called sieve sandwich in the twin-wire zone 12, into which the fibrous stock suspension 3 is introduced.
  • the two screens 4, 5 initially pass through an initial dewatering area 13 having an initial dewatering length L.13 in the area of the forming roller 6, a forming suction 14 having a preferably curved forming area 15 in the area of the twin-wire zone 12 and one another of the forming roller 6 is arranged.
  • the forming surface 15 itself consists of a plurality of mutually spaced and rigidly arranged strips 16, over which the two wires 4, 5 are guided with the fibrous suspension 3 located between them. Moreover, it forms in the direction of the direction S (arrow) at least one forming zone 17, which can be acted upon by a preferably controllable negative pressure p.17.
  • the formation of the negative pressure p.17 is indicated schematically only by an arrow.
  • At least one forming zone 17 opposite the Formiersauger 14 and at a distance A to the leading edge 18 of the first rigidly arranged bar 16.1 a arranged between two adjacent strips 16 of the Formiersaugers 14 formation bar 19 is provided, which is supported by means of resilient elements 20 and the with a selectable force K (arrow) against which it is touching first sieve 4 is pressed.
  • the ratio between the formed on the forming roller 6 initial Entfss proceedingssin L.13 of the initial Entfsstechniks Kunststoffs 13 and the distance A of the first formation bar 19 of the leading edge 18 of the first rigidly disposed bar 16.1 of Formiersaugers 14 a value in the range from 1.2 to 2.4, preferably from 1.4 to 2.2, in particular from 1.7 to 2.0, assumes.
  • a forming zone 21 having a forming angle ⁇ ⁇ 30.0 °, preferably ⁇ 27.0 °, in particular ⁇ 24.0 °, and a preferably controllable suction p. 21 formed.
  • the formation of the aspiration p.21 is indicated schematically only by an arrow.
  • the forming roller points 6 a Formierwalzen preparedr D.6 in the range of 1,400 to 2,000 mm, preferably from 1,475 to 1,950 mm, in particular from 1,525 to 1,800 mm, on.
  • the initial drainage length L.13 corresponds at least to the circumferential length of the forming zone 21.
  • the distance A of the first formation strip 19 from the leading edge 18 of the first rigidly arranged strip 16.1 of the forming suction 14 is ⁇ 400 mm, preferably ⁇ 350 mm, in particular ⁇ 300 mm.
  • the setting of the distance A can be done manually or optionally also automated, for example by means of at least one known to the expert, not explicitly shown adjusting device.
  • the adjustability itself is indicated by means of a double arrow.
  • a total of three formation strips 19, 19.2, 19.3 are arranged opposite the Formiersauger 14, wherein the first formation zone 17 of Formiersaugers 14 and the two other formation strips 19.2, 19.3 opposite the second Formierzone 17.2 in Sieblaufraum S (arrow) first formation strip 19 of Formiersaugers 14 are arranged.
  • the forming zones 17, 17. 2 can have a different number of bars 16.
  • the second forming zone 17.2 of Formiersaugers 14 can be acted upon with a preferably controllable / controllable vacuum p.17.2.
  • the formation of the negative pressure p.17.2 is indicated schematically only by an arrow.
  • the two negative pressures p.17, p.17.2 can assume different values adapted to the respective production parameters.
  • the three formation strips 19, 19.2, 19.3 have a mutual distance B in the range from 50 to 300 mm, preferably from 80 to 250 mm, in particular from 100 to 200 mm, wherein the individual distances B are different, adapted to the respective production parameters Can accept values.
  • strips 16 are arranged in the present embodiment.
  • the individual strips 16 of the Formiersaugers 14 in both Formierzonen 17, 17.2 in this case have a respective strip width B.16 in the range of 5 to 90 mm, preferably from 8 to 60 mm, in particular from 10 to 40 mm.
  • twin-wire zone 12 of the Doppelsiebformers 1 Formiersauger 14 in the wire direction S (arrow) following further, known in the art drainage arranged, such as an illustrated flat vacuum 22, known in professional circles HiVac sucker, or an indicated Siebsaugwalze 23. Instead of indicated suction sieve 23 may also be provided a second forming roller.
  • further auxiliary devices such as, for example, an injection device 24 or a guide device 25, can be arranged for accumulating white water.
  • the Indian FIG. 1 shown twin-wire former 1 is particularly suitable for use in a machine for producing a fibrous web of at least one pulp suspension.
  • FIG. 2 shows a schematic side view of a formation strip 19 for resilient support of a screen 4 shown in dashed lines in the region of a twin-wire zone 12 of a Doppelsiebformers 1 a machine for producing a fibrous web, in particular a paper or board web, in its operating position.
  • the strip 19 In the operating position, the strip 19 is pressed into the sieve 4 in a range of 0.5 to 5 mm, preferably 1 to 3 mm.
  • the strip 19 may be aligned at an angle ⁇ of +/- 90 ° to the vertical V depending on the course of the screen 4.
  • the strip 19 consists of a movable head strip 26 which extends transversely to the wire direction S (arrow) and slides over the at least partially the wire 4 during operation of the machine.
  • the head strip 26 is in terms of minimizing wear on the wire 4 of a ceramic material.
  • the strip 19 consists of a movable support bar 27 which is rigidly connected to the movable head strip 26 and which also extends transversely to the wire direction S (arrow) and is also guided in a fixed structure 28. Furthermore, the strip 19 comprises a fixed guide rail 29, which is rigidly arranged in the fixed structure 28 and which in turn extends transversely to the wire direction S (arrow).
  • the rigid arrangement of the guide rail 29 in the fixed structure 28 can be done for example by means of mutually-sided groove connections 30.1, 30.2, so that the guide rail 29 can be removed transversely to the wire direction S (arrow) from the machine.
  • a resilient pressing device 31 is arranged between the movable support bar 27 and the fixed guide rail 29 .
  • This serves to the movable support bar 27 together with the movable head strip 26 between a rest position, not shown, and the illustrated operating position in which the movable head strip 26 is pressed with a selectable force F (arrow) to the wire 4 to move.
  • the pressing device 31 is configured, for example, as a pressure hose 32, which is acted upon during the operating phase by an unillustrated pressure source known to a person skilled in the art, for example in an embodiment of a preferably controllable pressure pump, with an operating pressure p (arrow).
  • the pressure hose 32 preferably extends along the fixed guide rail 29 and is at least partially in terms of its circumference U.32, in particular at least the upper side, in a on the fixed guide rail 29 lower side mounted recess 33, in particular a groove 33.1, out.
  • the fixed guide rail 29 thus also serves as a carrier system for the pressing device 31, in particular for the pressure hose 32.
  • the bar 19 includes a resilient return means 34 for supporting the movable support bar 27 together with the movable head strip 26 from the illustrated operating position in the rest position, not shown, and for holding the two strips 26, 27 in the rest position.
  • the flexible return device 34 has distributed over the length of the movable support bar 27 away a plurality of movable return bracket 35, which are at least temporarily engageable at one end 35.1 with the movable support bar 27 and at the other end 35.2 of at least one each between the fixed guide rail 29 and the movable return bracket 35 arranged return element 36 are at least temporarily acted upon.
  • the temporary "engagement-engagement” and the temporary “application” takes place during the Bridung of the two strips 26, 27 from the illustrated operating position in the rest position not shown and during the rest position.
  • the invention provides a twin-wire former of the type mentioned above, which enables optimum control of the two edge layers, in particular with regard to the fine and filler distribution in the z-direction, in the fibrous web to be produced and thus the disadvantages of the known Sheet formation systems as far as possible, preferably even completely avoids.
  • further parameters such as the properties of the raw material used, the wire speed and the weight per unit area of the fibrous web to be produced, can be taken into account within the framework of the geometric possibilities.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Claims (13)

  1. Formeur à double toile (1) pour une machine de fabrication d'une nappe fibreuse (2) constituée d'au moins une suspension fibreuse (3), comprenant deux toiles sans fin périphériques (4, 5), dont la première toile (4) passe sur une première région périphérique (7) d'un rouleau de formage (6) et la deuxième toile (5) passe sur une région périphérique (9) d'un rouleau de tête (8) puis dans la région du rouleau de formage (6) sur la première toile (4) en formant une fente d'entrée de matière (10) en forme de coin, qui se termine à proximité immédiate d'une caisse de tête (11) qui reçoit au moins une suspension fibreuse (3), et les deux toiles (4, 5) avec l'au moins une suspension fibreuse (3) se trouvant entre elles formant ensuite au moins en partie une zone à double toile (12) et traversant en l'occurrence initialement dans la région du rouleau de formage (6) une région d'égouttage initiale (13) formée sur le rouleau de formage (6) avec une longueur d'égouttage initiale (L.13), un dispositif d'aspiration de formage (14) avec une surface de formage de préférence courbe (15) étant disposé dans la région de la zone à double toile (12) et en face du rouleau de formage (6), la surface de formage (15) se composant de plusieurs nervures espacées les unes par rapport aux autres et disposées rigidement (16, 16.1), sur lesquelles sont guidées les deux toiles (4, 5) avec l'au moins une suspension fibreuse (3) se trouvant entre elles, et constituant au moins une zone de formage (17, 17.2) pouvant être sollicitée dans la direction d'avance de toile (S) avec une dépression (p.17) de préférence commandable/ réglable, au moins une nervure de formage (19) disposée entre deux nervures (16) adjacentes du dispositif d'aspiration de formage (14) étant prévue dans l'au moins une zone de formage (17), en face du dispositif d'aspiration de formage (14) et à une distance (A) de l'arête de tête (18) de la première nervure (16.1) disposée rigidement, laquelle nervure de formage (19) étant supportée au moyen d'éléments flexibles et étant pressée avec une force sélectionnable (K) contre la première toile (4) en contact avec elle,
    caractérisé en ce que
    le rapport entre la longueur d'égouttage (L.13) initiale réalisée sur le rouleau de formage (6) de la région d'égouttage initiale (13) et la distance (A) de la première nervure de formage (19) à l'arête de tête (18) de la première nervure disposée rigidement (16.1) du dispositif d'aspiration de formage (14) a une valeur de l'ordre de 1,2 à 2,4, de préférence de 1,4 à 2,2, notamment de 1,7 à 2,0.
  2. Formeur à double toile (1) selon la revendication 1,
    caractérisé en ce que
    dans la région de la région d'égouttage initiale (13) formée sur le rouleau de formage (6) est réalisée une zone de formage (21) avec un angle de formage (α) ≤ 30,0°, de préférence ≤ 27,0°, notamment ≤ 24,0° et avec u n e aspiration (p.21) de préférence commandable/réglable.
  3. Formeur à double toile (1) selon la revendication 1 ou 2,
    caractérisé en ce que
    le rouleau de formage (6) présente un diamètre de rouleau de formage (D.6) de l'ordre de 1.400 à 2.000 mm, de préférence de 1.475 à 1.950 mm, notamment de 1.525 à 1.800 mm.
  4. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la distance (A) de la première nervure de formage (19) à l'arête de tête (18) de la première nervure (16.1) disposée rigidement du dispositif d'aspiration de formage (14) est ≤ 400 mm, de préférence ≤ 350 mm, notamment ≤ 300 mm.
  5. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la distance (A) de l'au moins une nervure de formage (19) à l'arête de tête (18) de la première nervure disposée rigidement (16.1) du dispositif d'aspiration de formage (14) peut être ajustée.
  6. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'au moins deux, de préférence au moins trois nervures de formage (19, 19.2, 19.3) sont disposées en face du dispositif d'aspiration de formage (14), au moins une nervure de formage (19) étant disposée en face d'une première zone de formage (17) du dispositif d'aspiration de formage (14) et au moins une autre nervure de formage (19.2, 19.3) étant disposée de préférence en face d'une deuxième zone de formage (17.2) du dispositif d'aspiration de formage (14).
  7. Formeur à double toile (1) selon la revendication 6,
    caractérisé en ce que
    les au moins deux, et de préférence au moins trois nervures de formage (19, 19.2, 19.3) présentent une distance mutuelle (B) de l'ordre de 50 à 300 mm, de préférence de 80 à 250 mm, notamment de 100 à 200 mm.
  8. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    dans la région (C) de l'arête de tête (18) de la première nervure (16.1) disposée rigidement du dispositif d'aspiration de formage (14) vers la première nervure de formage (19), est disposé un nombre de ≤ 8 nervures disposées rigidement (16) du dispositif d'aspiration de formage (14), de préférence de ≤ 6 nervures disposées rigidement (16) du dispositif d'aspiration de formage (14), notamment de ≤ 5 nervures disposées rigidement (16) du dispositif d'aspiration de formage (14).
  9. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les nervures (16, 16.1) du dispositif d'aspiration de formage (14) présentent une largeur de nervure respective (B.16) de l'ordre de 5 à 90 mm, de préférence de 8 à 60 mm, notamment de 10 à 40 mm.
  10. Formeur à double toile (1) selon la revendication 9,
    caractérisé en ce que
    la première nervure (16.1) du dispositif d'aspiration de formage (14) présente une plus grande largeur de nervure (B.16) que les nervures (16) la suivant dans la direction d'avance de la toile (S).
  11. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'au moins une nervure de formage (19) pour le support flexible de la première toile (4) dans la région de la zone à double toile (12) comprend une nervure de tête mobile (26), qui s'étend transversalement à la direction d'avance de la toile (S) et sur laquelle glisse au moins en partie la toile (4) pendant le fonctionnement de la machine, une nervure de support mobile (27), qui est connectée rigidement à la nervure de tête mobile (26) et qui s'étend également transversalement à la direction d'avance de la toile (S) et qui est guidée dans une structure fixe (28), une nervure de guidage fixe (29) qui est disposée rigidement dans la structure fixe (28) et qui s'étend à son tour transversalement à la direction d'avance de la toile (S), un dispositif de pressage flexible (31) qui est disposé entre la nervure de support mobile (27) et la nervure de guidage fixe (29), afin de déplacer la nervure de support mobile (27) conjointement avec la nervure de tête mobile (26) entre une position de repos et une position de fonctionnement, dans laquelle la nervure de tête mobile (26) peut être pressée avec une force sélectionnable (F) contre la toile (4), et un dispositif de retenue flexible (34) pour ramener la nervure de support mobile (27) conjointement avec la nervure de tête flexible (26) de la position de fonctionnement dans la position de repos et pour retenir les deux nervures (26, 27) dans la position de repos, le dispositif de retenue flexible (34) présentant plusieurs étriers de retenue (35) mobiles répartis sur toute la longueur de la nervure de support mobile (27), qui peuvent être amenés au moins en partie en prise à une extrémité (35.1) avec la nervure de support mobile (27), et qui peuvent être sollicités au moins temporairement à l'autre extrémité (35.2) d'au moins un élément de retenue (36) disposé entre la nervure de guidage fixe (29) et l'étrier de retenue mobile (35).
  12. Formeur à double toile (1) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'au moins une toile (4, 5), de préférence la première toile (4), présente une tension de toile (P) de l'ordre de 5 à 20 N/m, de préférence de 8 à 14 N/m.
  13. Machine de fabrication d'une nappe fibreuse (2) à partir d'au moins une suspension fibreuse (3),
    caractérisée en ce
    qu'elle comprend un formeur à double toile (1) selon l'une quelconque des revendications précédentes.
EP08165980A 2007-12-17 2008-10-07 Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse Not-in-force EP2072677B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007055834A DE102007055834A1 (de) 2007-12-17 2007-12-17 Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension

Publications (2)

Publication Number Publication Date
EP2072677A1 EP2072677A1 (fr) 2009-06-24
EP2072677B1 true EP2072677B1 (fr) 2010-12-29

Family

ID=40510459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08165980A Not-in-force EP2072677B1 (fr) 2007-12-17 2008-10-07 Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse

Country Status (3)

Country Link
EP (1) EP2072677B1 (fr)
AT (1) ATE493545T1 (fr)
DE (2) DE102007055834A1 (fr)

Family Cites Families (3)

* 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.
DE10106731A1 (de) 2001-02-14 2002-08-22 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
DE102005000175A1 (de) 2005-12-05 2007-06-06 Voith Patent Gmbh Leiste zur nachgiebigen Stützung eines Siebs und Doppelsiebpartie

Also Published As

Publication number Publication date
DE502008002125D1 (de) 2011-02-10
DE102007055834A1 (de) 2009-06-18
ATE493545T1 (de) 2011-01-15
EP2072677A1 (fr) 2009-06-24

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