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EP1676951B1 - Dispositif d'essorage d'une section de formage à deux toiles d'une machine pour fabriquer une bande de matériau fibreux - Google Patents

Dispositif d'essorage d'une section de formage à deux toiles d'une machine pour fabriquer une bande de matériau fibreux Download PDF

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Publication number
EP1676951B1
EP1676951B1 EP05112961A EP05112961A EP1676951B1 EP 1676951 B1 EP1676951 B1 EP 1676951B1 EP 05112961 A EP05112961 A EP 05112961A EP 05112961 A EP05112961 A EP 05112961A EP 1676951 B1 EP1676951 B1 EP 1676951B1
Authority
EP
European Patent Office
Prior art keywords
wire
skimmer
shoe
dewatering device
twin
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.)
Not-in-force
Application number
EP05112961A
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German (de)
English (en)
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EP1676951A1 (fr
Inventor
Thomas Dr. Jaschinski
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 EP1676951A1 publication Critical patent/EP1676951A1/fr
Application granted granted Critical
Publication of EP1676951B1 publication Critical patent/EP1676951B1/fr
Anticipated expiration legal-status Critical
Not-in-force 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus

Definitions

  • the invention relates to a dewatering device of 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, comprising a forming unit, in particular a forming roller, at least in sections two forming a twin-wire zone and the at least one fibrous suspension receiving therebetween over its peripheral surface Sieves are guided with a Sieblaufraum, and at least one front wall having Siebsaugkasten at least predominantly downstream of the forming unit in Sieblaufraum and the forming unit facing away sieve of Doppelsiebzone opposite, wherein the Siebsaugkasten upstream a Skimmertechnisch is connected upstream at least on the outlet side in the arranged over the forming unit twin-wire zone and mutually the former unit is arranged and the at least one a distance from the benac
  • the sieve skimmerschuh having the double-sieve and having the Skimmerschuh on a support structure by means of at least one adjustment so adjustably mounted that its distance from the adjacent sieve
  • Such a drainage device is known from European Patent Application EP 0 371 786 A2 known.
  • a dewatering device with a Skimmer which preferably finds its use in obliquely or horizontally oriented twin wire with an overhead drainage, for example from the European Patent EP 0 627 524 B1 and the unpublished German patent application DE 10 2004 043 426.3 from 06.09.2004 known.
  • the distance of the Skimmerschuhs to the adjacent screen of the twin-wire zone can not be varied.
  • Another disadvantage is that the rigid connection with the sieve suction box leads to the fact that when adjusting the Siebsaugkastens with attached Skimmer attended also the distance of the skimmer shoe to the adjacent screen of the twin-wire zone changes. As the distance of the skimmer shoe increases, so does the distance between the shoe bottom and the adjacent wire. Moving the skimmer device more towards the forming unit, in particular forming roller, and thus reduces the distance of the Skimmer responded, so also reduces the gap between the Skimmerschuh and the adjacent sieve. Conversely, the gap width between the shoe bottom and the adjacent wire increases with an increase in the distance of the Skimmer observed.
  • a further disadvantage is that the non-uniform vacuum profile forming transversely to the screen direction adversely affects the quality of the fibrous web to be produced.
  • the quality of the fibrous web to be produced it is possible to cite, for example, the ash transverse profile and the formation transverse profile.
  • the significantly improved quality features are intended to include, in particular, a uniform ash and formation transverse profile extending far into the respective edge region of the fibrous web.
  • the skimmer shoe is designed to be sectioned transversely to the wire direction, and at least one center segment and on both sides each an edge segment, the segments of the skimmer shoe being adjustable independently of one another by means of at least one respective adjusting device.
  • the edge vacuum can be set independently of one another by means of a separately positionable distance between the individual segments, thus achieving a profiling transversely to the direction of the wire run.
  • Another advantage of the segment-wise adjustment is that the edge segments need not already be designed with a certain predetermined profile shape, but can be made at an angle and at a distance. This makes it possible to change the profile shape of the Skimmerschuhs, thereby affecting, for example, the ash transverse profile or the formation transverse profile.
  • the distance of the Skimmerschuhs to the adjacent screen regardless of the distance of the Skimmermann for forming unit, in particular Formierwalze, set or be nacho.
  • the height of the vacuum applied to the base of the riser channel can additionally be adjusted by means of the adjustment of the gap between the skimmer shoe and the adjacent sieve.
  • the support structure to which the skimmer shoe is adjustably mounted may, in the first advantageous embodiment, be medium-mounted or directly attached to the front wall of the suction suction box.
  • it can be attached to a arranged in Sieblaufraum before Siebsaugkasten crossbeam so that the Skimmerschuh remains independent of a possible movement of the Siebsaugkastens in position.
  • Both versions are characterized by individual advantages: so the first embodiment is low in design and in terms of their strength and Rigidity advantageous, while the second version offers a degree of flexibility and independence, obviously at a cost.
  • the segments of the skimmer shoe have different profile shapes transversely to the wire direction and / or in the wire direction.
  • the center distance of the skimmer shoe to the adjacent screen of the twin-wire zone is adjustable in a range from 5 to 60 mm, preferably from 10 to 20 mm, and the respective edge-side distance of the skimmer shoe to the adjacent screen of the twin-wire zone assumes a value of at least 20 mm, wherein the distance between the underside of the Skimmerschuhs and the adjacent screen of the twin-wire zone is defined.
  • the skimmer shoe ideally has a tapering distance in the direction of the wire feed from the adjacent wire.
  • the respective adjusting device preferably comprises at least one movement device effecting the adjustment to the adjacent sieve of the twin-wire zone and at least one return device effecting the adjustment towards the supporting structure.
  • the movement device can comprise, for example, a hose which can be acted upon by a variable, preferably controllable / controllable pressure, whereas the return device can comprise a spring element.
  • both the movement device and the return device may comprise other currently known actuator types.
  • the respective adjusting device comprises at least one spindle drive, a double-acting hydraulic drive or a double-acting pneumatic drive, each causing the adjustment of the skimmer shoe to the adjacent screen of the twin-wire zone as well as its return to the support structure out.
  • the adjustment may include other currently known actuator types.
  • At least one displacement transducer system is provided for determining the position of at least one segment of the skimmer shoe. This creates the possibility of a reproducible positioning of the Skimmerschuhs.
  • a resulting between the support structure and the Skimmerschuh gap in the adjustment of the Skimmerschuh is preferably by a flexible Seal closable.
  • the Skimmerschuh in its height direction preferably consists of at least two parts, preferably a particular machine-width carrier plate and a particular sectioned transverse to the direction of filament profile plate.
  • Both plate parts are preferably made of a respective plastic.
  • the Skimmer dressed has a Skimmerance
  • the adjacent forming unit has a vertical strip spacing in the range of 10 to 20 mm, preferably in the range of 14 to 18 mm.
  • the specification of this bar spacing is usually based on the so-called CAD zero line.
  • baffle plate is arranged such that part of the jet is separated and deflected into the riser channel. The deflection of the beam should be done only flat.
  • the baffle is preferably arranged centrally or approximately centrally in the initial region of the riser channel in order to direct as large an amount of the jet into the front part of the riser channel.
  • it further has a sheet spacing, measured in the perpendicular from the lowest point of the baffle to the adjacent screen, in the range of 10 to 40 mm, preferably in the range of 15 to 30 mm, and a plate thickness in the range of 3 to 10 mm , preferably in the range of 3 to 5 mm, on.
  • it has an at least single, preferably multiple angled sheet metal contour, wherein the sheet metal contour essentially corresponds to the rear side of the skimmer shoe.
  • the baffle is preferably attached to the skimmer shoe by means of several and in at least one, preferably in a plurality of transverse to Sieblaufraum rows arranged connecting elements.
  • the connecting elements may be, for example, commercially available screws.
  • a plurality of measuring tubes arranged in the skimmer shoe and extending transversely to the wire direction are provided so as to be able to measure a vacuum profile present in the riser channel.
  • a plurality of connecting elements are pierced at least the bottom row, to allow introduction of a plurality of measuring tubes in the initial region of the riser channel.
  • the pierced and fitted with a measuring tube each connecting elements can be arranged transversely to the direction of Sieblaufraum evenly or non-uniformly and reinforced in the two edge regions of Skimmerschuhs. This embodiment allows in principle a simple and accurate measurement of the present in the initial region of the riser channel vacuum profile.
  • FIG. 1 shows a schematic and sectional side view of a part of a known and belonging to the prior art dewatering device 1 of a twin-wire former not shown a machine for producing a fibrous web, in particular a paper or board web, from at least one pulp suspension.
  • the dewatering device 1 has a forming unit 3 designed as a known forming roller 4, over the circumferential surface 5 of which at least in sections two screens 7, 8 forming a double-screen zone 6 and in between the at least one fibrous suspension 2 are guided with a screen direction S (arrow). It also has a Siebsaugkasten (Obersiebsaugkasten) 9 arranged opposite one another in Sieblaufraum S (arrow) at least predominantly downstream and facing away from the forming unit 3 screen 8 of the twin-wire zone 6 opposite with several suction zones of known type.
  • the sieve suction box 9 has a front wall 10. On the suction suction box 9 opposite side of the two wires 7, 8 may continue to be known per se and merely indicated Anpressologicaln of different shape and mode of operation may be appropriate.
  • the suction suction box 9 upstream of a Skimmer Vietnamese 11 is connected upstream, which is at least the outlet side in the area guided over the forming unit 3 Doppelsiebzone 6 and mutually the former unit 3 and at least one distance A to the adjacent screen 8 of the twin-wire zone 6 having Skimmerschuh 12.
  • the Skimmer dressed 11 also has a Skimmerang 24 in a known manner.
  • FIGS. 2 and 3 now show partial side views of two possible embodiments of a skimming device 11 according to the invention of a drainage device 1.
  • the respective skimmer shoe 12 is adjustably mounted on a support structure 13 by means of at least one adjusting device 14 such that its distance A to the adjacent wire 8 of the at least partially guided over the peripheral surface 5 of the forming unit 3 double-wire zone 6 is adjustable.
  • the leadership of Skimmerschuhs takes over a well-known profile guide 15, which consists of two pairs of profiles 16.1, 16.2.
  • the support structure 13, on which the skimmer shoe 12 is adjustably mounted, is attached to a cross-strainer 17 arranged in the direction of the wire sieve S (arrow) in front of the sieve suction box 9, for example by means of fixed bearings F 1 , F 2 shown in such a way that the skimmer shoe 12 is independent of a possible movement the Siebsaugkastens 9 remains in its position.
  • the support structure 13, on which the skimmer shoe 12 is adjustably mounted is mounted directly or indirectly on the front wall 10 of the suction suction box 9. For example, it can be screwed or even welded.
  • the skimmer shoe 12 is designed to be sectioned transversely to the wire direction S (arrow) and in this case comprises at least one center segment 12 M and both sides an edge segment 12 RR , 12 RL (see FIG.
  • the Skimmerschuh 12 may be formed flexible (see Figure 5).
  • the skimmer shoe 12 has a spacing A S tapering in the wire direction S (arrow) from the adjacent wire 8.
  • the respective adjusting device 14 of FIG. 2 comprises at least one adjustment to the adjacent sieve 8 of the twin-wire zone 6 causing movement device 18 and at least one adjustment to the support structure 13 towards causing return device 19th
  • the movement device 18 comprises two hoses 18.1, 18.2 which can be acted upon by a variable, preferably controllable pressure p 1 , p 2 .
  • a variable, preferably controllable pressure p 1 , p 2 By providing these two independently operable movement devices 18.1, 18.2, the possibility is created that they cause an inclination of the Skimmerschuhs 12 at different actuation.
  • the return device 19 in the embodiment of Figure 2 comprises two spring elements 19.1.
  • the spring elements 19.1 are in this case placed such that a sufficient and accurate retrieval of Skimmerschuhs 12 is ensured.
  • the respective adjusting device 14 of FIG. 3 comprises a spindle drive 42, which in each case has a spindle 42. 1 attached to the skimmer shoe 12 and a spindle lifting element 42. 2 arranged on the supporting structure 13 for the corresponding spindle 42.
  • the adjusting device 14 thus assumes the function of the movement device 18 as well as the return device 19 (see FIG.
  • the respective adjusting device 14 in a further embodiment also include a double-acting hydraulic drive or a double-acting pneumatic drive, each causing the adjustment of the Skimmerschuhs 12 to the adjacent screen 8 of the twin-wire zone 6 as well as its return to the support structure 13 out.
  • a gap 20 formed between the support structure 13 and the skimmer shoe 12 during the adjustment of the skimmer shoe 12 can be closed by a flexible seal 21.
  • This seal 21 is preferably a round seal 22, it may also include a sponge rubber or the like in a further embodiment.
  • the Skimmerschuh 12 of the embodiments of Figures 2 and 3 consists in its height direction H (arrow) of at least two parts 23.1, 23.2, preferably a particular machine-width carrier plate 23.2 and a particular transverse to the wire direction S (arrow) sectioned profile plate 23.1.
  • the adjacent forming unit 3 has a vertical strip spacing L in the range of 10 to 20 mm, preferably in the range of 14 to 18 mm.
  • At least one known displacement transducer system 25 is provided for determining the position of at least one segment of the skimmer shoe 12. Since the construction and the function of such a displacement transducer system 25 is known to those skilled in the art, apart from its detailed representation. The displacement transducer system 25 is therefore only indicated schematically.
  • baffle 27 is arranged in the initial region of a preferably nearly vertical riser channel 26 such that part of the jet is separated and preferably deflected flat into the riser channel 26 (directional arrow) ).
  • the baffle 27 is arranged centrally or approximately centrally in the initial region of the riser 26 to direct as large an amount of the beam as possible into the front part of the riser 26, and further has a plate spacing B, measured in the vertical line from the lowest point P of FIG Guide plate 25 to the adjacent sieve 8, in the range of 10 to 40 mm, preferably in the range of 15 to 30 mm on.
  • the guide plate 27 also has a plate thickness C in the range of 3 to 10 mm, preferably in the range of 3 to 5 mm, and an at least single, preferably multiple angled Sheet metal contour K, which substantially corresponds to the back 28 of Skimmerschuhs 12, on.
  • the guide plate 27 is fastened to the skimmer shoe 12 by means of a plurality of connecting elements 29 which are arranged in two rows 30.1, 30.2 extending transversely to the direction of sweeping direction S (arrow).
  • the connecting elements 29 are preferably guided in T-slots 31 and preferably commercially available screws 33 with respective scenes 32nd
  • a plurality of measuring tubes 34 extending transversely to the screen direction S (arrow) are provided, in order thereby to be able to measure a vacuum profile present in the ascending channel 26. Since this measurement principle is well known to those skilled in the art, it is not explained in detail here.
  • a plurality of connecting elements 29 of the lower row 30.1 are pierced to allow insertion of the measuring tube 34 in the initial region of the riser 26.
  • the pierced and each equipped with a measuring tube 34 connecting elements 29 are arranged transversely to the wire direction S (arrow) evenly or non-uniformly and reinforced in the two nachbe2enen edge regions of Skimmerschuhs 12.
  • FIG. 4 shows an enlarged view of the partial side view of FIG. 2.
  • the dewatering device 1 comprises, as already stated, a forming unit 3 designed as a known forming roller 4, over the peripheral surface 5 of which at least in sections two screens 7, 8 forming a double-screen zone 6 and the at least one fibrous suspension 2 receiving them with a screen direction S (arrow) are guided.
  • the forming roller 4 is partially vacuumed over the angle ⁇ away in a known manner.
  • the drainage device 1 further has a direction of the wire direction S (arrow) at least predominantly downstream and the wire 8 of the double-wire zone 6 oppositely arranged Siebsaugkasten (Obersiebsaugkasten) 9 with several suction zones of known design, wherein the underside of the suction preferably rigidly mounted drainage strips 35 are arranged.
  • the drainage strips 35 opposite a deflector 36 and a plurality of preferably flexible contactable strips 37 are arranged, wherein only the first bar 37 is not indicated.
  • the Siebsaugkasten 9 upstream in the wire direction S (arrow) and the forming roller 4 is arranged opposite a known breast roll 38, on the peripheral surface 39 at least in sections, the Siebsaugkasten 9 facing sieve 8 is guided.
  • suction suction box 9 upstream of a Skimmer adopted 11 is connected upstream, which is at least the outlet side in the area guided over the forming unit 3 Doppelsiebzone 6 and mutually the former unit 3 and at least one distance A to the adjacent screen 8 of the twin-wire zone 6 having Skimmerschuh 12.
  • the Skimmerschuh 12 is, as already stated, attached to a support structure 13 by means of at least one adjusting device 14 (arrow) so adjustable that its distance A to the adjacent sieve 8 of at least in sections on the peripheral surface 5 of the forming unit 3 guided twin-wire zone 6 is adjustable.
  • adjusting device 14 With regard to the further details of the adjusting device 14, reference is made to the description of Figures 2 and 3.
  • FIG. 5 shows a schematic sectional representation of FIG. 2 according to the section line A-A.
  • the illustrated Skimmerschuh 12 is, as already stated, formed transversely to the wire direction S (arrow) pliable.
  • the Skimmerschuh 12 is mounted on a support structure 13 by means of at least one adjusting device 14 shown adjustable so that its distance A to adjacent sieve 8 of at least in sections on the peripheral surface 5 of the forming unit 3 guided Doppelsiebzone 6 (sieve 7 and pulp suspension 2) and adjustable ,
  • the support structure 13, on which the skimmer shoe 12 is adjustably mounted, is mounted on a crosspiece 17 such that the skimmer shoe 12 remains independent of a possible movement of the suction filter box, not shown, in its position.
  • the adjusting device 14 comprises a plurality of adjustment means for the adjacent sieve 8 of the twin-wire zone 6 causing movement means 18 and a plurality of the adjustment to the support structure 13 causing return means 19.
  • the respective adjusting device 14 is designed as a respective actuator 14.1, the connects both the function of the movement device 18 and the return device 19 in one unit.
  • Such an actuator 14.1 may be, for example, a spindle drive, a double-acting hydraulic drive or a double-acting pneumatic drive.
  • the actuators 14.1 are arranged next to one another, that is to say transversely to the screen direction S (arrow), and they can be actuated individually.
  • an individual bending line of Skimmerschuhs 12 and a resulting distance line AL of Skimmerschuhs 12 to the adjacent screen 8 can be generated.
  • the distance line AL has along its course different states A of Skimmerschuhs 12 to the adjacent sieve 8, so that an optimal adjustment of the gap between the Skimmerschuh 12 and the adjacent sieve 8 with the aim of a uniform as possible formation of a vacuum profile transverse to the wire direction S ( Arrow) in the area of the Skimmer worn 11 can be effected.
  • the distance line AL viewed in the direction of wire direction S (arrow), has hanging edges.
  • FIG. 6 shows a further embodiment of a skimmer shoe 12 of FIG. 5.
  • the Skimmerschuh 12 has in this embodiment, several vulnerabilities 40, so that its bending line and thus the working line AL can be made easier and more precise.
  • the weak points 40 are increasingly arranged in critical, that is bending-intensive areas and they can have different cross-sectional shapes: V-grooves, rectangular grooves, notches, dome, basically any polygonal contour.
  • FIGS. 4 to 6 can of course also be used in the skimming device 11 according to the invention of FIG. 3. By way of example only, they are related to the inventive Skimmer worn 11 of Figure 2.
  • FIGS. 7A to 7D show a number of schematic partial side views of different types of twin wire formers, which make it possible to use the dewatering device 1 according to the invention.
  • Such a twin wire former may, for example, a vertical or an approximately vertical twin-6 ( Figure 7A - "DuoFormer TQ v), an inclined twin-6 ( Figure 7B -" DuoFormer TQ "), a horizontal or nearly horizontal twin-6 ( Figure 7C -" DuoFormer TQ H "; Figure 7D, possibly with oblique twin-wire zone 6.
  • the types of twin-wire formers shown in Figures 7A to 7D merely have an exemplary character.
  • a drainage device which allows the production of a fibrous web with significantly improved quality features even in the event of possible positional variations of the components and groups of the drainage device.
  • the significantly improved quality features include, in particular, a uniform and wide ash and formation transverse profile extending far into the respective edge region of the fibrous web.

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  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (25)

  1. Dispositif d'essorage (1) d'une section de formage à deux toiles d'une machine pour fabriquer une bande de matière fibreuse, en particulier une bande de papier ou de carton, à partir d'au moins une suspension de matière fibreuse (2), comprenant une unité de formage (3), en particulier un cylindre de formage (4), dont la surface périphérique (5) guide au moins par zones deux toiles (7, 8) formant une zone à deux toiles (6) et contenant entre elles l'au moins une suspension de matière fibreuse (2) dans une direction de défilement des toiles (S), et une caisse aspirante de toile (9) présentant au moins une paroi avant, qui est installée au moins pour l'essentiel après l'unité de formage (3) dans la direction de défilement des toiles (S) et qui est disposée en face de la toile (8) de la zone à deux toiles (6) située à l'opposé de l'unité de formage (3), dans lequel un dispositif d'écrémage (11) précède la caisse aspirante de toile (9) du côté d'entrée et est disposé du côté de sortie dans la région de la zone à deux toiles (6) guidée sur l'unité de formage (3) et du côté opposé à l'unité de formage (3) et qui comprend au moins un patin d'écrémage (12) situé à une distance (A) de la toile voisine (8) de la zone à deux toiles (6), et dans lequel le patin d'écrémage (12) est monté sur une structure de support (13) de façon réglable au moyen d'au moins un dispositif de réglage (14) de telle manière que sa distance (A) par rapport à la toile voisine (8) de la zone à deux toiles (6) guidée au moins par zones sur la surface périphérique (5) de l'unité de formage (3) soit réglable, caractérisé en ce que le patin d'écrémage (12) est sectionné transversalement à la direction de défilement des toiles (S) et comprend au moins un segment médian (12M) et de part et d'autre chaque fois un segment de bord (12RL, 12RR), dans lequel les segments (12M, 12RL, 12RR) du patin d'écrémage (12) sont réglables indépendamment les uns des autres au moyen d'au moins un dispositif de réglage respectif (14).
  2. Dispositif d'essorage (1) selon la revendication 1, caractérisé en ce que la structure de support (13), sur laquelle le patin d'écrémage (12) est monté de façon réglable, est installée directement ou indirectement sur la paroi avant de la caisse aspirante de toile (9).
  3. Dispositif d'essorage (1) selon la revendication 1, caractérisé en ce que la structure de support (13), sur laquelle le patin d'écrémage (12) est monté de façon réglable, est installée sur une traverse transversale (17) disposée avant la caisse aspirante de toile (9) dans la direction de défilement des toiles (S), de telle manière que le patin d'écrémage (12) reste dans sa position indépendamment d'un mouvement possible de la caisse aspirante de toile (9).
  4. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les segments (12M, 12RL, 12RR) du patin d'écrémage (12) présentent des formes profilées différentes transversalement à la direction de défilement des toiles (S) et/ou dans la direction de défilement des toiles (S).
  5. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la distance centrale (AM) du patin d'écrémage (12) à la toile voisine (8) de la zone à deux toiles (6) est réglable dans une plage de 5 à 60 mm, de préférence de 10 à 20 mm, et en ce que la distance respective (AR) du bord du patin d'écrémage (12) à la toile voisine (8) de la zone à deux toiles (6) prend une valeur d'au moins 20 mm, dans lequel la distance (A) entre la face inférieure du patin d'écrémage (12) et la toile voisine (8) de la zone à deux toiles (6) est définie.
  6. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le patin d'écrémage (12) présente une distance (AS) par rapport à la toile voisine (8) qui diminue dans la direction de défilement des toiles (S).
  7. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de réglage respectif (14) comprend au moins un dispositif de déplacement (18) assurant le réglage en direction de la toile voisine (8) de la zone à deux toiles (6) et au moins un dispositif de rappel (19) assurant le réglage en direction de la structure de support (13).
  8. Dispositif d'essorage (1) selon la revendication 7, caractérisé en ce que le dispositif de déplacement (18) comprend un tuyau souple (18.1, 18.2) pouvant être sollicité par une pression variable, de préférence commandable/réglable (p1, p2).
  9. Dispositif d'essorage (1) selon la revendication 7 ou 8, caractérisé en ce qu'il est prévu, dans la direction de défilement des toiles (S), au moins deux dispositifs de déplacement (18) pouvant être actionnés indépendamment l'un de l'autre, qui provoquent une inclinaison du patin d'écrémage (12) lorsqu'ils sont actionnés différemment.
  10. Dispositif d'essorage (1) selon l'une quelconque des revendications 7 à 9, caractérisé en ce que le dispositif de rappel (19) comprend un élément de ressort (19.1).
  11. Dispositif d'essorage (1) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le dispositif de réglage respectif (14) comprend au moins un entraînement à broche (42; 42.1, 42.2), un entraînement hydraulique à double commande ou un entraînement pneumatique à double commande, qui assurent respectivement le réglage du patin d'écrémage (12) en direction de la toile voisine (8) de la zone à deux toiles (6) ainsi que son réglage de rappel en direction de la structure de support (13).
  12. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu au moins un système d'enregistrement de course (25) pour déterminer la position d'au moins un segment (12M, 12RL, 12RR) du patin d'écrémage (12).
  13. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une fente (20) entre la structure de support (13) et le patin d'écrémage (12), apparaissant lors du réglage du patin d'écrémage (12), peut être obturée par un joint d'étanchéité flexible (21).
  14. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le patin d'écrémage (12) se compose, dans le sens de sa hauteur (H), d'au moins deux parties, de préférence d'une plaque de support (23.2) ayant notamment la largeur de la machine et d'une plaque profilée (23.1) sectionnée notamment transversalement à la direction de défilement des toiles (S).
  15. Dispositif d'essorage (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif d'écrémage (11) comprend une latte d'écrémage (24), qui présente, par rapport à l'unité de formage voisine (3), une distance de latte perpendiculaire (L) de l'ordre de 10 à 20 mm, de préférence de l'ordre de 14 à 18 mm.
  16. Dispositif d'essorage (1) selon la revendication 15, caractérisé en ce qu'au moins un déflecteur (27), ayant de préférence la largeur de la machine, est disposé entre le patin d'écrémage (12) et la latte d'écrémage (24), dans la région initiale d'un canal montant (26) de préférence pratiquement vertical, de telle manière qu'une partie du jet soit séparée et soit déviée dans le canal montant (26).
  17. Dispositif d'essorage (1) selon la revendication 16, caractérisé en ce que le déflecteur (27) est disposé au milieu ou sensiblement au milieu de la région initiale du canal montant (26), afin de dévier une aussi grande quantité que possible du jet dans la partie avant du canal montant (26).
  18. Dispositif d'essorage (1) selon la revendication 16 ou 17, caractérisé en ce que le déflecteur (27) présente une distance de déflecteur (B), mesurée à la verticale du point le plus bas (P) du déflecteur (27) jusqu'à la toile voisine (8), de l'ordre de 10 à 40 mm, de préférence de l'ordre de 15 à 30 mm.
  19. Dispositif d'essorage (1) selon l'une quelconque des revendications 16 à 18, caractérisé en ce que le déflecteur (27) présente une épaisseur de tôle (C) de l'ordre de 3 à 10 mm, de préférence de l'ordre de 3 à 5 mm.
  20. Dispositif d'essorage (1) selon l'une quelconque des revendications 16 à 19, caractérisé en ce que le déflecteur (27) présente un contour de tôle (K) coudé au moins une fois, et de préférence plusieurs fois.
  21. Dispositif d'essorage (1) selon la revendication 20, caractérisé en ce que le contour de tôle (K) correspond essentiellement à la face arrière (28) du patin d'écrémage (12).
  22. Dispositif d'essorage (1) selon l'une quelconque des revendications 16 à 21, caractérisé en ce que le déflecteur (27) est fixé sur le patin d'écrémage (12) au moyen de plusieurs éléments de fixation (29) disposés en au moins une, et de préférence en plusieurs rangées (30.1, 30.2) orientées transversalement à la direction de défilement des toiles (S).
  23. Dispositif d'essorage (1) selon l'une quelconque des revendications 16 à 22, caractérisé en ce qu'il est prévu plusieurs petits tubes de mesure (34) disposés dans le patin d'écrémage (12) et orientés transversalement à la direction de défilement des toiles (S), afin de pouvoir mesurer ainsi un profil de vide existant dans le canal montant (26).
  24. Dispositif d'essorage (1) selon la revendication 22 et 23, caractérisé en ce que plusieurs éléments de fixation (29) au moins de la rangée la plus basse (30.1) sont percés, afin de permettre une insertion de plusieurs petits tubes (34) dans la région initiale du canal montant (26).
  25. Dispositif d'essorage (1) selon la revendication 24, caractérisé en ce que les éléments de fixation (29) percés et garnis chacun d'un petit tube de mesure (34) sont disposés de façon uniforme ou non uniforme transversalement à la direction de défilement des toiles (S) et de façon plus dense dans les deux régions de bord du patin d'écrémage (12).
EP05112961A 2004-12-30 2005-12-23 Dispositif d'essorage d'une section de formage à deux toiles d'une machine pour fabriquer une bande de matériau fibreux Not-in-force EP1676951B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004000068A DE102004000068A1 (de) 2004-12-30 2004-12-30 Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn

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EP1676951A1 EP1676951A1 (fr) 2006-07-05
EP1676951B1 true EP1676951B1 (fr) 2007-11-14

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EP (1) EP1676951B1 (fr)
AT (1) ATE378464T1 (fr)
DE (2) DE102004000068A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034180A1 (de) * 2007-07-23 2009-01-29 Voith Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und Verfahren zur Herstellung einer Faserstoffbahn

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185064A (en) * 1987-09-07 1993-02-09 Valmet-Ahlstrom Inc. Means for controlling wires in a paper machine or cardboard machine
FI885606A7 (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Banformningsfoerfarande och anordning.
US5202000A (en) * 1991-09-30 1993-04-13 Beloit Technologies, Inc. Saveall apparatus for a twin-wire former
DE29513274U1 (de) * 1995-08-18 1995-10-12 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Formiervorrichtung für eine Papier- oder Kartonmaschine
DE19828237A1 (de) * 1998-06-25 1999-12-30 Voith Sulzer Papiertech Patent Doppelsiebformer
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren

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EP1676951A1 (fr) 2006-07-05
DE102004000068A1 (de) 2006-07-13
ATE378464T1 (de) 2007-11-15
DE502005001965D1 (de) 2007-12-27

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