EP1953296B1 - Procédé de fabrication d'une bande de matière fibreuse et section de formage à deux toiles pour la mise en oeuvre du procédé - Google Patents

Procédé de fabrication d'une bande de matière fibreuse et section de formage à deux toiles pour la mise en oeuvre du procédé Download PDF

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Publication number
EP1953296B1
EP1953296B1 EP08150696A EP08150696A EP1953296B1 EP 1953296 B1 EP1953296 B1 EP 1953296B1 EP 08150696 A EP08150696 A EP 08150696A EP 08150696 A EP08150696 A EP 08150696A EP 1953296 B1 EP1953296 B1 EP 1953296B1
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EP
European Patent Office
Prior art keywords
fabric
suction
dewatering box
twin wire
zone
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EP08150696A
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German (de)
English (en)
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EP1953296A1 (fr
Inventor
Thomas Dr. Jaschinski
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1953296A1 publication Critical patent/EP1953296A1/fr
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Publication of EP1953296B1 publication Critical patent/EP1953296B1/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 method for producing a fibrous web, in particular a paper or board web, from at least one pulp suspension in a twin-wire former of a machine for producing the fibrous web with a wedge-shaped inlet gap having twin-wire zone, which is at least partially formed by two continuous endless sieves of which the first, over a preferably positionable inlet roller guided and then the already introduced pulp suspension covering sieve in the twin-wire zone is guided over a plurality of mutually spaced rigidly on a preferably positionable and several suction zones comprehensive drainage crate ledges and of which the second, the introduced pulp suspension receiving Sieve in the twin-wire zone via several and mutually the strips of preferably positionable and several suction zones comprehensive drainage box arranged Leis is guided, which are supported by means of resilient elements and which are pressed with a selectable force against the second wire, wherein the first, the introduced pulp suspension not yet covering sieve immediately before his leadership on the rigidly arranged on the drainage box strips by the effective range at least a suction shoe arranged
  • 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 according to the preamble of independent claim 8.
  • twin-wire former is known, for example, from the International Application WO 2004/018768 A1 in an embodiment of a so-called “hybrid former" known.
  • This type of former has the characteristic that uncontrolled and strong air currents, in particular before and in the wedge-shaped inlet gap, at higher speeds, such as over 1200 m / min, lead to appreciable impairments of the producible quality in the fibrous web to be produced, such as, for example a deterioration of the residual variance of the basis weight cross-section or to disturbances in the sheet structure.
  • the disorders in the leaf structure are commonly referred to as bear paws and are known to result from large-scale formation disorders.
  • bright spots on the top of the fibrous web to be formed may occur, which are caused inter alia by entrained air or thrown off drops.
  • twin-wire former passes over a forming shoe, which is arranged rigidly on a stationary dewatering box and whose wire guide surface has a fixed convex radius of curvature in the range from 600 to 4,000 mm, preferably from 800 to 3,000 mm.
  • a forming shoe which is arranged rigidly on a stationary dewatering box and whose wire guide surface has a fixed convex radius of curvature in the range from 600 to 4,000 mm, preferably from 800 to 3,000 mm.
  • the higher speeds are in this case in a range of over 1,200 m / min, preferably of over 1,400 m / min, in particular of over 1,600 m / min.
  • the at least one directly to the drainage box suction shoe is formed adjustable in position.
  • the drainage box is thus formed together with the suction shoe as a functional unit and the entrained substances may include, for example, white water or the like.
  • the suction shoe and the subsequent suction zones of the dewatering box form a functional unit, wherein the actual dewatering of the pulp suspension through the first sieve takes place only on the first suction zone and so, for example, a against the Sieblaufraum back flowing pulp suspension can be sucked from the suction shoe arranged in front of the first suction zone.
  • disturbances in sheet formation are effectively counteracted.
  • the structure of a fibrous mat in the initial region ie the area of deposition of fibers on the first sieve on the first suction zone by means of the constantly applied, adjustable and adjustable vacuum, the drainage can be actively influenced, whereby the web formation is positively influenced.
  • the surface of the fibrous web formed and the further web structure are influenced particularly positively by the defined deposition of the outer and the following fibrous layers by means of the above-described arrangement and sequence of the suction zones and of the regulatable and adjustable vacuum of the respective suction zone or suction zones.
  • speeds of more than 1,200 m / min preferably more than 1,400 m / min, in particular of more than 1,600 m / min, can be achieved in the production of fibrous webs with sufficient qualities, since no boundary layers build up before the actual dewatering elements can.
  • the suction shoe which can be adjusted in its position and is arranged directly on the drainage box is arranged in such a way that the fibrous suspension introduced and having a layer height accumulates on the first sieve in the first suction zone of the drainage box, ie is covered by it ,
  • the suction shoe can sufficiently condition the first screen guided past it without touching the boundary layer of the pulp suspension.
  • the suction shoe which can be adjusted in its position and is arranged directly on the drainage box, is preferably arranged such that the introduced pulp suspension having a layer height is at the beginning of the first suction zone of the dewatering box runs on the first sieve, so it is covered by him.
  • the first suction zone is enveloped by the pulp suspension and the second wire and so completely sealed, that the height of the vacuum formed in the first suction zone is adjustable and adjustable. This in turn has a positive effect on the achievable quality of the fibrous web to be produced.
  • the layer height of the pulp suspension is preferably measured using a gamma-gauge measurement or an electrical measuring principle (capacitive or inductive) and the measurement signal obtained is preferably used to control the gap width formed between the two screens, wherein the gap width of the is the vertical distance of the first wire at the run-off point from the inlet roll of the second wire.
  • the multiple suction zones comprehensive drainage box can be raised or lowered together with directly arranged suction shoe.
  • the inlet sieve leading the first sieve the suction shoe emptying the first sieve of entrained substances and removing both the emptied substances and the air entrained by the first sieve, and the multi-suction drainage box be positioned independently of each other. In principle, therefore, any operating modes and parameters necessary for achieving good qualities can be set.
  • the second sieve is guided mutually the first suction zone of the dewatering box over several bars, which are supported by means of resilient elements and which are pressed with a selectable force against the second sieve.
  • further impulses are introduced early in the pulp suspension, which improve the drainage and formation of the same noticeably.
  • the second sieve can be guided mutually all suction zones of the dewatering box over several bars, which are supported by means of resilient elements and which are pressed with a selectable force against the second sieve.
  • the object of the invention is achieved in a twin-wire former of the type mentioned above in that the at least one suction shoe arranged directly on the drainage box is adjustable in its position.
  • the drainage box is thus formed together with the suction shoe as a functional unit and the entrained substances may include, for example, white water or the like.
  • the suction shoe has an open suction surface in the range of 10 to 90%, preferably from 30 to 49%. These areas ensure adequate suction of both the first sieve and the free inlet gap.
  • the suction shoe may preferably have at least one suction pad which has at least one slotted covering or a plurality of slidable strips includes.
  • the individual strips can be mounted on a convexly curved suction box, the strip distances are freely selectable and different slot widths can be adjusted.
  • the suction shoe preferably has a convex radius of curvature in the range from 300 to 6,000 mm, preferably from 800 to 3,000 mm.
  • This convex radius of curvature promotes a stable sifting run, ensures defined run-in conditions and ensures a good sieve consolidation.
  • the convex radius of curvature predetermines the converging inlet gap with the aim of softer dewatering of the pulp suspension. Also, the pulp suspension located on the second wire undergoes defined impact conditions on the first wire.
  • the first suction zone of the dewatering box has an open suction area in the range from 10 to 90%, preferably from 30 to 49%, and / or a convex radius of curvature in the range from 300 to 10,000 mm, preferably from 800 to 6,000 mm.
  • Said open suction surface is sufficient to guide the first wire on the remaining surface still safe and to support accordingly. In addition, optimal suction and drainage can be ensured.
  • the twin-wire former according to the invention can in principle be designed as a hybrid former known per se, wherein the second sieve receiving the introduced pulp suspension is preferably a Fourdrinier wire, which is guided over a pre-dewatering zone prior to entry into the twin-wire zone.
  • the twin-wire former according to the invention may be formed as a gap former known per se, wherein the inlet roller leading the first screen is preferably a breast roller and wherein the twin-wire zone preferably substantially horizontal or approximately horizontally, at a pitch angle to the horizontal, or vertical or approximately vertical.
  • FIG. 1 shows a schematic and sectional side view of an initial portion of a twin-wire zone 2 of a twin-wire former 1 designed as a hybrid former.
  • the twin-wire zone 2 extends essentially horizontally or approximately horizontally.
  • the twin-wire former 1 is part of a machine not shown further for producing a fibrous web, in particular a paper or board web, from at least one fibrous stock suspension 3.
  • the twin-wire former 1 comprises two continuous endless sieves, a first sieve 4, which is also referred to as an upper sieve, and a second sieve 5, which is also referred to as a Fourdrinier sieve, lower sieve or carrier sieve.
  • the sieves 4, 5 form at least in sections with each other, the twin-wire zone 2, which has a wedge-shaped inlet gap 6 for the pulp suspension 3.
  • the introduction, not shown, of the pulp suspension 3 onto the second wire 5 takes place by means of at least one known but not explicitly illustrated head box 7, whose headbox nozzle 8 can moreover be provided with at least one lamella 9 for the purpose of influencing and improving the beam quality (cf. FIGS. 2 and 3 ).
  • the first screen 4 is guided over a preferably positionable inlet roller 10, whose possible positioning is indicated by means of a symbolic motion double arrow A. Subsequently, the first sieve 4 in the twin-wire zone 2 is guided over a plurality of strips 12, which are arranged rigidly at a mutual distance on a preferably positionable and several suction zones Z11.x comprehensive drainage box 11. The positionability of the dewatering box 11 is indicated by means of a symbolic movement double arrow B.
  • the drainage box 11 has a total of three suction zones Z11.1, Z11.2 and Z11.3, which are arranged directly one behind the other and which can be acted upon by different suppressions pU11.1, pU11.2 and pU11.3.
  • the first wire 4 covers during its course of the first sieve 4 from the inlet roller 10 to the dewatering box 11 from the already introduced on the second sieve 5 pulp suspension 3 from.
  • the second and the introduced pulp suspension 3 receiving sieve 5 is guided in the twin-wire zone 2 over a plurality of strips 13 which are supported by resilient elements 14 and which are pressed with a selectable force F13 (arrow) against the second wire 2.
  • the strips 13 are mutually arranged on the strips 12 of the second suction zones Z11.2 of the drainage box 11.
  • the second sieve 5 is a Fourdriniersieb 5.1, which before entering the Twin-wire zone 2 is guided over a merely indicated, but known to those skilled pre-dewatering zone 15.
  • the introduced pulp suspension 3 is not yet covered sieve 4 immediately before its leadership on the rigidly arranged on the drainage box 11 strips 12 by the effective range W at least one of the drainage box 11 preferably in its position adjustably arranged suction shoe 16, which due the preferably controllable / controllable aspiration of the effective range W with a negative pressure pU16 empties the first sieve 4 of entrained substances and removes both the deflated substances and the entrained air from the first sieve 4.
  • the preferably controllable / suction with the vacuum pU16 is indicated by an arrow C.
  • the suction shoe 16 is therefore not rigidly disposed on the drainage box 11, but it is preferably freely adjustable in its general position, in particular also with respect to the drainage box 11.
  • the positionability of the suction shoe 16 is indicated by means of a movement double arrow D. Of course, it can also be positioned together with the drainage box 11 due to an at least temporary coupling together.
  • the first sieve 4 does not have to abut it completely, but rather it can only be guided over it in sections, that is, on the outlet side, unless it runs directly onto the first suction zone pU11.1 of the dewatering box 11.
  • the suction shoe 16 is arranged sealingly with respect to the inlet roller 10, so that only the air introduced into the inlet gap 6 and not the ambient air is sucked in and removed behind the suction shoe.
  • the seal can due to a enschenden geometric design of the Both components 10, 16, but also due to additional fittings, such as sealing elements and the like, can be effected.
  • the suction shoe 16 has an open suction surface F16 in the range of 10 to 90%, preferably 30 to 49%, and a convex curvature radius K16 in the range of 300 to 6,000 mm, preferably from 800 to 3,000 mm.
  • the suction shoe 16 has at least one suction pad 17, which comprises at least one slotted covering or several slidable strips.
  • the suction pad 17 is indicated only by dashed lines.
  • the suction shoe 16 which can be adjusted in its position and is arranged directly on the dewatering box 11, is arranged in such a way that the fibrous suspension 3 having a layer height H3 runs onto the first wire 4 at an impact point ATP in the first suction zone Z11.1 of the dewatering box 11 So it is covered.
  • the suction shoe 16 which can be adjusted in position and is arranged directly on the drainage box 11, can also be arranged in such a way that the fibrous suspension 3 having a layer height H3 has an impact point ATP at the beginning of the first suction zone Z11.1 of FIG Drainage box 11 runs onto the first sieve 4, so it is covered by him.
  • a merely indicated device 18 for measuring the layer height H3 of the pulp suspension 3 using a gamma-gauge measurement or an electrical measuring principle (capacitive or inductive) is provided, wherein the measurement signal obtained for controlling / regulating the between the two Seven trained gap width S is used.
  • the gap width S is here by definition the vertical distance of the first sieve 4 at the drain point P of the inlet roll 10 from the second sieve 5.
  • the gap width S can be adjusted by the inlet sieve 10 leading the first sieve 4 emptying the first sieve 4 of entrained substances and both the emptied substances and the air entrained by the first sieve 3 removing suction shoe 16 and the plurality of suction zones Z11.x comprehensive drainage box 11 are independently positionable (double movement arrows A, B and D).
  • the first suction zone Z11.1 of the dewatering box 11 also has an open suction surface F11.1 in the range of 10 to 90%, preferably 30 to 49%, and a convex radius of curvature K11.1 in the range of 300 to 10,000 mm, preferably 800 up to 6,000 mm, on.
  • FIG. 2 shows a schematic and sectional side view of an initial portion of a twin-wire zone 2 of a twin-wire former 1 designed as a gap former.
  • the twin-wire zone 2 extends substantially vertically or approximately vertically. It can also extend in a further embodiment at a pitch angle to the horizontal.
  • This twin-wire former 1 is also part of a machine not shown further for producing a fibrous web, in particular a paper or board web, from at least one fibrous stock suspension 3.
  • the twin-wire former 1 comprises two continuous endless sieves, a first sieve 4, which is also referred to as a top sieve, and a second sieve 5, which is also referred to as a bottom sieve or a support sieve.
  • the sieves 4, 5 form at least in sections with each other the twin-wire zone 2, which has a wedge-shaped inlet gap 6 for the pulp suspension 3.
  • the headbox 8 also can be provided with at least one blade 9 for influencing and improving the beam quality.
  • the first sieve 4 is guided over a preferably positionable inlet roller 10 in the form of a breast roller whose possible positioning capability is indicated by means of a symbolic movement double arrow A. Subsequently, the first sieve 4 in the twin-wire zone 2 is guided over a plurality of strips 12, which are arranged rigidly at a mutual distance on a preferably positionable and several suction zones Z11.x comprehensive drainage box 11. The positionability of the dewatering box 11 is indicated by means of a symbolic movement double arrow B.
  • the drainage box 11 has a total of three suction zones Z11.1, Z11.2 and Z11.3, which are arranged directly one behind the other and which can be acted upon by different suppressions pU11.1, pU11.2 and pU11.3.
  • the first wire 4 covers during its course of the first sieve 4 from the inlet roller 10 to the dewatering box 11 from the already introduced on the second sieve 5 pulp suspension 3 from.
  • the second and the introduced pulp suspension 3 receiving sieve 5 is guided in the twin-wire zone 2 over a plurality of strips 13 which are supported by resilient elements 14 and which are pressed with a selectable force F13 (arrow) against the second wire 2.
  • the strips 13 are arranged at least mutually the strips 12 of the two suction zones Z11.1 and Z11.2 of the drainage box 11. Expanding the strips 13 may also be mutually the strips 12 of the third suction Z11.3 the drainage box 11 arranged (dashed line).
  • the preferably controllable / suction is indicated by means of an arrow C.
  • the suction shoe 16 is therefore not rigidly disposed on the drainage box 11, but it is preferably freely adjustable in its general position, in particular also with respect to the drainage box 11.
  • the positionability of the suction shoe 16 is indicated by means of a movement double arrow D.
  • the first sieve 4 does not have to abut it completely, but rather it can only be guided over it in sections, that is, on the outlet side, unless it runs directly onto the first suction zone pU11.1 of the dewatering box 11.
  • the suction shoe 16 is arranged sealingly with respect to the inlet roller 10, so that only the air introduced into the inlet gap 6 and not the ambient air is sucked in and removed behind the suction shoe.
  • the seal can be effected due to a endreamenden geometric design of the two components 10, 16, but also due to additional fittings, such as sealing elements and the like.
  • the suction shoe 16 has an open suction surface F16 in the range of 10 to 90%, preferably 30 to 49%, and a convex curvature radius K16 in the range of 300 to 6,000 mm, preferably from 800 to 3,000 mm.
  • the suction shoe 16 has at least one suction pad 17, which comprises at least one slotted covering or several slidable strips.
  • the suction pad 17 is indicated only by dashed lines.
  • the suction shoe 16 which can be adjusted in position and is arranged directly on the drainage box 11, is arranged such that the fibrous stock suspension 3 having a layer height H3 runs onto the first wire 4 at an impact point ATP at the beginning of the first suction zone Z11.1 of the drainage box 11, is covered by him so.
  • the suction shoe 16 which can be adjusted in position and disposed directly on the drainage box 11, can also be arranged such that the introduced pulp suspension 3 having a layer height H3 at an impact point ATP in the first suction zone Z11.1 of the drainage box 11 accumulates on the first sieve 4, so it is covered by him.
  • a merely indicated device 18 for measuring the layer height H3 of the pulp suspension 3 using a gamma-gauge measurement or an electrical measuring principle (capacitive or inductive) is provided, wherein the measurement signal obtained for controlling / regulating the between the two Seven trained gap width S is used.
  • the gap width S is here by definition the vertical distance of the first sieve 4 at the drain point P of the inlet roll 10 of the second sieve 5.
  • the gap width S can be adjusted so that the first sieve 4 leading inlet roll 10, which is the first sieve 4 emptying of entrained substances and both the deflated substances and the air entrained by the first screen 3 removing suction shoe 16 and the plurality of suction zones Z11.x comprehensive drainage box 11 are independently positionable (double movement arrows A, B and D).
  • the first suction zone Z11.1 of the dewatering box 11 also has an open suction surface F11.1 in the range of 10 to 90%, preferably 30 to 49 %, and a convex curvature radius K11.1 in the range of 300 to 10,000 mm, preferably 800 to 6,000 mm.
  • FIG. 3 shows a schematic and sectional side view of an initial portion of a twin-wire zone 2 of a twin-wire former 1 designed as a gap former.
  • the twin-wire zone 2 extends substantially vertically or approximately vertically. It can also extend in a further embodiment at a pitch angle to the horizontal.
  • This twin-wire former 1 is also part of a machine not shown further for producing a fibrous web, in particular a paper or board web, from at least one fibrous stock suspension 3.
  • the illustrated twin-wire former 1 essentially corresponds to that in FIG FIG. 2 shown twin-wire former 1, so that hereby with regard to its description to the description of the in the FIG. 2 shown twin-wire former 1 is referenced.
  • the second and the introduced pulp suspension 3 receiving sieve 5 of the twin-wire former 1 of FIG. 3 is guided in the twin-wire zone 2 over a plurality of strips 13, which are supported by means of resilient elements 14 and which are pressed with a selectable force F13 (arrow) against the second wire 2.
  • the strips 13 are mutually arranged on the strips 12 of the second suction zones Z11.2 of the drainage box 11.
  • a dewatering element 19 known to the person skilled in the art is arranged, which acts on the pulp suspension 3 through the second wire 5.
  • the preferably controllable / suction is indicated by means of an arrow C.
  • the suction shoe 16 is therefore not rigidly disposed on the drainage box 11, but it is preferably freely adjustable in its general position, in particular also with respect to the drainage box 11.
  • the positionability of the suction shoe 16 is indicated by means of a movement double arrow D.
  • the first sieve 4 does not have to abut it completely, but rather it can only be guided over it in sections, that is, on the outlet side, unless it runs directly onto the first suction zone pU11.1 of the dewatering box 11.
  • the suction shoe 16 has an open suction surface F16 in the range of 10 to 90%, preferably 30 to 49%, and a convex curvature radius K16 in the range of 300 to 6,000 mm, preferably from 800 to 3,000 mm.
  • the suction shoe 16 has at least one suction pad 17, which comprises at least one slotted covering or several slidable strips.
  • the suction pad 17 is indicated only by dashed lines.
  • the suction shoe 16 which can be adjusted in position and is arranged directly on the drainage box 11, is arranged such that the fibrous stock suspension 3 having a layer height H3 runs onto the first wire 4 at an impact point ATP at the beginning of the first suction zone Z11.1 of the drainage box 11, so covered by him.
  • twin-wire former 1 is suitable in a particular extent for carrying out the method according to the invention for producing a fibrous web, in particular a paper or board web, from at least one pulp suspension 3 in a Doppelsiebformer 1 a machine for producing the fibrous web with a wedge-shaped inlet gap 6 having twin-wire 2 , which is at least partially formed by two continuous endless screens 4, 5, of which the first, guided over a preferably positionable inlet roller 10 and then the already introduced pulp suspension 3 covering sieve 4 in the twin-wire zone 2 over a plurality of spaced apart rigidly at a preferably positionable and several suction zones Z11.1, Z11.2, Z11.3 comprehensive drainage box 11 arranged strips 12 is guided and of which the second, the introduced pulp suspension 3 receiving sieve 5 in the twin-wire zone 2 via me Leaders and mutually the strips 12 of the preferably positionable and a plurality of suction Z11.1, Z11.2, Z11.3 comprehensive drainage box 11 arranged strips 13 is guided, which are supported by resilient elements
  • twin-wire former 1 to a special extent for carrying out the dependent method claims.
  • a method and a twin-wire former of the aforementioned types are improved by the invention so that a pulp suspension can be dewatered even at higher speeds and also in producing a high-quality fibrous web and that disturbances during the sheet forming process can be actively counteracted.
  • the higher speeds are in this case in a range of over 1,200 m / min, preferably of over 1,400 m / min, in particular of over 1,600 m / min.

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Claims (21)

  1. Procédé de fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton, à partir d'au moins une suspension de matière fibreuse (3) dans une section de formage à deux toiles (1) d'une machine pour la fabrication de la bande de matière fibreuse avec une zone à deux toiles (2) présentant une fente d'entrée en forme de coin (6), qui est formée au moins localement par deux toiles sans fin (4, 5) défilant en continu, dont la première toile (4) guidée sur un rouleau d'entrée (10) pouvant de préférence être positionné et couvrant ensuite la suspension de matière fibreuse déjà introduite (3) est guidée dans la zone à deux toiles (2) par plusieurs lattes (12) disposées à distance fixe l'une de l'autre sur un caisson de séchage (11) pouvant de préférence être positionné et comportant plusieurs zones d'aspiration (Z11.1, Z11.2, Z11.3) et dont la seconde toile (5) emportant la suspension de matière fibreuse introduite (3) est guidée dans la zone à deux toiles (2) par plusieurs lattes (13) disposées en face des lattes (12) du caisson de séchage (11) pouvant de préférence être positionné et comportant plusieurs zones d'aspiration (Z11.1, Z11.2, Z11.3), qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) avec une force (F13) pouvant être choisie, dans lequel la première toile (4) ne couvrant pas encore la suspension de matière fibreuse emportée (3) est guidée, immédiatement avant son guidage par les lattes (12) disposées de façon rigide sur le caisson de séchage (11), à travers la région active (W) d'un sabot aspirant (16) disposé sur le caisson de séchage (11), lequel vide la première toile (4) des substances emportées par suite de l'aspiration de préférence commandable/réglable de la région active (W) et évacue aussi bien les substances captées que l'air entraîné par la première toile (4), caractérisé en ce que l'au moins un sabot aspirant (16) disposé directement sur le caisson de séchage (11) est réalisé de façon réglable dans sa position (D).
  2. Procédé selon la revendication 1, caractérisé en ce que le sabot aspirant (16) réglable dans sa position (B) et disposé directement sur le caisson de séchage (11) est disposé de telle manière que la suspension de matière fibreuse (3) introduite et présentant une hauteur de couche (H3) arrive sur la première toile (4) dans la première zone d'aspiration (Z11.1) du caisson de séchage (11), et soit donc couverte par celle-ci.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le sabot aspirant (16) réglable dans sa position (B) et disposé directement sur le caisson de séchage (11) est disposé de telle manière que la suspension de matière fibreuse (3) introduite et présentant une hauteur de couche (H3) arrive sur la première toile (4) au commencement de la première zone d'aspiration Z11.1) du caisson de séchage (11), et soit donc couverte par celle-ci.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que la hauteur de couche (H3) de la suspension de matière fibreuse (3) est mesurée en utilisant une mesure d'épaisseur gamma ou un principe de mesure électrique, et en ce que le signal de mesure obtenu est utilisé pour la commande/régulation de la largeur de fente (S) entre les deux toiles (4, 5), dans lequel la largeur de fente (S) est la distance perpendiculaire entre la première toile (4) au point de sortie (P) du rouleau d'entrée (10) et la seconde toile (5).
  5. Procédé selon l'une quelconque des revendications précédentes, en particulier selon la revendication 4, caractérisé en ce que le rouleau d'entrée (10) guidant la première toile (4), le sabot aspirant (16) captant les substances emportées et évacuant aussi bien les substances captées que l'air entraîné par la première toile (4), et le caisson de séchage (11) comportant plusieurs zones d'aspiration (Z11.1, Z11.2, Z11.3) sont positionnés indépendamment les uns des autres.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la seconde toile (5) est guidée, sur le côté opposé à la première zone aspirante (Z11.1) du caisson de séchage (11), par plusieurs lattes (13) qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) par une force (F13) qui peut être choisie.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la seconde toile (5) est guidée, sur le côté opposé à toutes les zones d'aspiration (Z11.1, Z11.2, Z11.3) du caisson de séchage (11), par plusieurs lattes (13) qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) par une force (F13) qui peut être choisie.
  8. Section de formage à deux toiles (1) d'une machine pour la fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier ou de carton, à partir d'au moins une suspension de matière fibreuse (3) avec deux toiles sans fin (4, 5) défilant en continu, dont la première toile (4) guidée sur un rouleau d'entrée (10) pouvant de préférence être positionné et couvrant ensuite la suspension de matière fibreuse déjà introduite (3) est guidée dans la zone à deux toiles (2) par plusieurs lattes (12) disposées à distance fixe l'une de l'autre sur un caisson de séchage (11) pouvant de préférence être positionné et comportant plusieurs zones d'aspiration (Z11.1, Z11.2, Z11.3) et dont la seconde toile (5) emportant la suspension de matière fibreuse introduite (3) est guidée dans la zone à deux toiles (2) par plusieurs lattes (13) disposées en face des lattes (12) du caisson de séchage (11) pouvant de préférence être positionné et comportant plusieurs zones d'aspiration Z11.1, Z11.2, Z11.3), qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) avec une force (F13) pouvant être choisie, dans lequel la première toile (4) ne couvrant pas encore la suspension de matière fibreuse emportée (3) est guidée, immédiatement avant son guidage par les lattes (12) disposées de façon rigide sur le caisson de séchage (11), à travers la région active (W) d'un sabot aspirant (16) disposé sur le caisson de séchage (11), lequel vide la première toile (4) des substances emportées par suite de l'aspiration de préférence commandable/réglable de la région active (W) et évacue aussi bien les substances captées que l'air entraîné par la première toile (4), caractérisée en ce que l'au moins un sabot aspirant (16) disposé directement sur le caisson de séchage (11) est réalisé de façon réglable dans sa position (D).
  9. Section de formage à deux toiles (1) selon la revendication 8, caractérisée en ce que le sabot aspirant (16) réglable dans sa position (B) et disposé directement sur le caisson de séchage (11), est disposé de telle manière que la suspension de matière fibreuse (3) introduite et présentant une hauteur de couche (H3) arrive sur la première toile (4) dans la première zone d'aspiration (Z11.1) du caisson de séchage (11), et soit donc couverte par celle-ci.
  10. Section de formage à deux toiles (1) selon la revendication 8 ou 9, caractérisée en ce que le sabot aspirant (16) réglable dans sa position (B) et disposé directement sur le caisson de séchage (11) est disposé de telle manière que la suspension de matière fibreuse (3) introduite et présentant une hauteur de couche (H3) arrive sur la première toile (4) au commencement de la première zone d'aspiration (Z11.1) du caisson de séchage (11), et soit donc couverte par celle-ci.
  11. Section de formage à deux toiles (1) selon la revendication 9 ou 10, caractérisée en ce qu'il est prévu un dispositif (18) pour la mesure de la hauteur de couche (H3) de la suspension de matière fibreuse (3) par utilisation d'une mesure d'épaisseur gamma ou d'un principe de mesure électrique, dans laquelle le signal de mesure obtenu et utilisé pour la commande/régulation de la largeur de fente (S) formée entre les deux toiles (4, 5) et dans laquelle la largeur de fente (S) est la distance perpendiculaire entre la première toile (4) au point de sortie (P) du rouleau d'entrée (10) et la seconde toile (5).
  12. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 11, caractérisée en ce que le rouleau d'entrée (10) guidant la première toile (4), le sabot aspirant (16) captant les substances emportées et évacuant aussi bien les substances captées que l'air entraîné par la première toile (4), et le caisson de séchage (11) comportant plusieurs zones d'aspiration (Z11.1, Z11.2, Z11.3) sont positionnés indépendamment les uns des autres.
  13. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 12, caractérisée en ce que la seconde toile (5) est guidée, sur le côté opposé à la première zone aspirante (Z11.1) du caisson de séchage (11), par plusieurs lattes (13) qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) par une force (F13) qui peut être choisie.
  14. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 13, caractérisée en ce que la seconde toile (5) est guidée, sur le côté opposé à toutes les zones d'aspiration (Z11.1, Z11.2, Z11.3) du caisson de séchage (11), par plusieurs lattes (13) qui sont supportées au moyen d'éléments souples (14) et qui sont pressées contre la seconde toile (5) par une force (F13) qui peut être choisie.
  15. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 14, caractérisée en ce que le sabot aspirant (16) présente une surface aspirante ouverte (F16) dans une plage de 10 à 90 %, de préférence de 30 à 49 %.
  16. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 15, caractérisée en ce que le sabot aspirant (16) présente au moins une garniture aspirante (17), qui comprend au moins une garniture fendue ou plusieurs lattes déplaçables.
  17. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 15, caractérisée en ce que le sabot aspirant (16) présente un rayon de courbure convexe (K16) dans une plage de 300 à 6.000 mm, de préférence de 800 à 3.000 mm.
  18. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 17, caractérisée en ce que la première zone d'aspiration (Z11.1) du caisson de séchage (11) présente une surface aspirante ouverte (F11) dans une plage de 10 à 90 %, de préférence de 30 à 49 %.
  19. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 18, caractérisée en ce que la première zone d'aspiration (Z11.1) du caisson de séchage (11) présente un rayon de courbure convexe (K11.1) dans une plage de 30 à 10.000 mm, de préférence de 800 à 6.000 mm.
  20. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 19, caractérisée en ce que ce qu'elle se présente sous la forme d'une section de formage hybride, dans laquelle la seconde toile (5) recevant la suspension de matière fibreuse introduite (3) est une toile de Fourdrinier (5.1), qui est guidée sur une zone de préséchage (15) avant de pénétrer dans la zone à deux toiles (2).
  21. Section de formage à deux toiles (1) selon l'une quelconque des revendications 8 à 19, caractérisée en ce qu'elle se présente sous la forme d'une section de formage à fente connue, dans laquelle le rouleau d'entrée (10) guidant la première toile (4) est un rouleau de tête, et dans laquelle la zone à deux toiles (2) s'étend de façon essentiellement horizontale ou à peu près horizontale, sous un angle d'inclinaison par rapport à l'horizontale, ou verticale ou à peu près verticale.
EP08150696A 2007-02-01 2008-01-28 Procédé de fabrication d'une bande de matière fibreuse et section de formage à deux toiles pour la mise en oeuvre du procédé Not-in-force EP1953296B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000065A DE102007000065A1 (de) 2007-02-01 2007-02-01 Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens

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EP1953296A1 EP1953296A1 (fr) 2008-08-06
EP1953296B1 true EP1953296B1 (fr) 2010-01-13

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AT (1) ATE455207T1 (fr)
DE (2) DE102007000065A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027432A1 (de) 2009-07-02 2011-01-05 Voith Patent Gmbh Formiereinheit und Verfahren zur Herstellung einer Materialbahn

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002304A1 (de) 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
CA2489659C (fr) 2002-08-23 2010-02-16 Metso Paper, Inc. Formation de nappe de papier ou de carton dans un formeur double toile ou dans une partie double toile d'un formeur
FI116688B (fi) * 2004-02-13 2006-01-31 Metso Paper Inc Monikerrosrainan muodostusosa

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EP1953296A1 (fr) 2008-08-06
DE102007000065A1 (de) 2008-08-07
DE502008000306D1 (de) 2010-03-04
ATE455207T1 (de) 2010-01-15

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