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EP2739780B1 - Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus - Google Patents

Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus Download PDF

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Publication number
EP2739780B1
EP2739780B1 EP12732825.0A EP12732825A EP2739780B1 EP 2739780 B1 EP2739780 B1 EP 2739780B1 EP 12732825 A EP12732825 A EP 12732825A EP 2739780 B1 EP2739780 B1 EP 2739780B1
Authority
EP
European Patent Office
Prior art keywords
wire
slice
headbox
layer
stationary
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.)
Active
Application number
EP12732825.0A
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German (de)
English (en)
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EP2739780A1 (fr
Inventor
Markus Häußler
Hans Loser
Wolfgang Ruf
Jürgen Prössl
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
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Voith Patent GmbH
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Publication of EP2739780A1 publication Critical patent/EP2739780A1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
    • 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
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the invention relates to a sheet forming system for a machine for producing a two- or multi-layer fibrous web, in particular a paper, cardboard or packaging paper web, from at least one pulp suspension, comprising a two- or multi-layer headbox with a headbox, the at least two across the width the headbox extending, separated by at least one separating element, during the operation of the two- or multi-layer headbox each having a pulp suspension as pulp suspension flow leading and converging nozzle chambers, each having downstream over the width of the headbox outlet gap downstream, the two outer Nozzle spaces outside each having an outer wall and wherein on at least one outer wall outlet side, a diaphragm is arranged, and a wire section, which circulates at least one in a wire loop ndes endless sieve, wherein the at least one sieve is a wire, which in a Vorent camess mecanicsumble after or in the region of application of the at least one pulp suspension as a pulp suspension jet by means of the two- or multi-layer headbox via a
  • FIG. 8 This document shows a three nozzle chambers and thus three-layer headbox for a machine for producing a three-layer fibrous web, wherein the three, the three-layer headbox nozzle forming nozzle chambers of the three-layer headbox are separated by rigid partitions.
  • at least one existing between two adjacent nozzle spaces partition to a separation and compensation element which is rigid at its upstream end and which is much easier to move at its downstream end over a length of at least 30 mm across the beam plane as the separating and guiding element
  • at least one outer wall of the headbox nozzle having three nozzle chambers may include a diaphragm for correcting the outlet gap.
  • the pulp suspension jet of the three-layer headbox which is formed from three pulp suspension streams, is placed on a wire of a four-wire former known to the person skilled in the art.
  • the fourdrinier wire forming section is in a pre-dewatering section after or in the region of application of the at least one fibrous suspension as a pulp suspension free jet by means of the three-layer headbox via a stationary and preferably evacuated screening table, the surface of which touches the wire mesh of a covering with several successively arranged in the wire direction formed in the machine transverse direction strips with intervening free drainage holes, and several suction elements, in particular suction boxes out.
  • the headbox facing outer wall of the headbox nozzle of a two- or multi-layer headbox represented, a straight lower lip or, as in FIG. 2 shown, a lower lip with a downstream bevel in the range of 1 to 5 ° used to avoid a convergent region between the separating element and the lower outer wall at the nozzle outlet. Because a converged zone would be one Introduce bending moment in the top of the separating element, as already on the opposite side of the tip of the separating element ambient pressure acts on them.
  • the headbox has a nozzle with a separating blade.
  • a respective limiting lip orifice
  • the separating lamella ends in front of the outlet slit of the nozzle in the area of the boundary lips.
  • the known embodiments have various disadvantages, which show, inter alia, in poor and therefore intolerable cover qualities of the two outer layers. There are also high turbulences on the underside of the pulp suspension jet, which lead to a hard and fine-grained formation structure on the underside of the fibrous web to be produced.
  • the aperture is arranged on the lower, the wire screen facing outer wall, that the aperture on the lower, the wire screen facing outer wall a diaphragm angle of ⁇ 15 °, preferably of ⁇ 20 °, in particular of ⁇ 25 °, wherein the diaphragm angle is the deviating angle between the inner surface of the outer wire facing the outer wire and the inner, preferably facing the inner surface of the wire facing outer wall immediately adjacent diaphragm surface of the diaphragm, and the panel at the lower, the wire screen facing outer wall has a diaphragm board of ⁇ 1 mm, preferably of ⁇ 2 mm, in particular ⁇ 3 mm, wherein the diaphragm board, the length of the inner, preferably facing the inner surface of the wire facing outer wall and that the headbox of the two- or multi-layer headbox, for the purpose of varying the Strahlauf Economicswinkels and / or Strahlauf Economicsline while
  • the two- or multi-layer headbox in particular the headbox of the two- or multi-layer headbox, there is a significant contraction in the side facing the wire of the pulp suspension jet.
  • This distinct contraction smoothes out the surface of the pulp suspension jet in this regard, as has been demonstrated in numerous series of experiments, and thereby appreciably improves the coverage quality on this side of the pulp suspension jet.
  • this embodiment according to the invention leads to a soft formation structure on this side of the fibrous web to be produced.
  • the diaphragm arranged on the lower outer wall facing the longitudinal wire can be connected to the lower outer wall, in particular screwed on, but it can also be formed in one piece with the lower outer wall.
  • At least one nozzle chamber may be provided with at least one blade known to a person skilled in the art, which preferably ends in the nozzle chamber.
  • a diaphragm is also arranged on the upper outer wall facing away from the longitudinal sieve, which preferably has the same positioning and / or dimensioning as the diaphragm arranged on the lower outer wall facing the longitudinal sieve.
  • a baffle is disposed on the upper, strainer-facing outer wall having a baffle and an iris depth, and at least two of a pulp suspension during operation of the bi- or multi-layer headbox touched surfaces, an upstream ramp surface and a downstream major surface having.
  • at least one refractive surface which is in contact with a fibrous suspension during operation of the two- or multi-layer headbox, is preferably provided between the shoulder surface of this upper diaphragm and its main surface at the upper diaphragm.
  • the at least one refracting surface of the upper orifice between the run-up surface of the orifice and its major surface effectively eliminates the possibility of flow separation in the pulp suspension flow in the region of the upper orifice of the two- or multi-layer headbox.
  • the previous properties of the two- or multi-layer headbox which possibly have a positive effect on the development of flow separation, such as the degree of convergence of the headbox of the two- or multi-layer headbox, the employment of the upper diaphragm or the upper diaphragm master, thus do not play a significant role more.
  • Such an embodiment of the upper panel is for example from the document DE 10 2009 027 079 A1 known.
  • the wire section preferably comprises two continuous sieves circulating in each case in a sieve loop, wherein the second upper sieve runs onto the uppermost pulp suspension after the pre-dewatering section and the two sieves then form a double-wire zone at least in sections.
  • the wire in the twin-wire zone preferably runs over a plurality of strips, which are arranged mutually rigidly arranged on a drainage box strips, which are supported by means of resilient elements and which are pressed with a selectable force against the wire.
  • the headbox nozzle of the two- or multi-layer headbox is positionable to vary the jet angle of incidence and / or the jet impact line while maintaining an unchanged geometry of the headbox of the dual or multi-layer headbox. It is advantageous if at least the entire headbox of the two- or multi-layer headbox around a transverse to the wire straight line, in particular the Strahlauf Economicsline and / or one in the region of the two- or multi-layer headbox, especially in the area of the headbox of Two- or multi-layer headbox lying straight from 0.1 to 5 °, preferably from 0.1 to 3 °, in particular from 0.1 to 2 °, is rotatable.
  • This embodiment thus combines the headbox nozzle of the two- or multi-layer headbox with a variability in the jet impact angle or in the Strahlauf Economicsline on the wire to ensure optimum jet injection of the pulp suspension jet.
  • the conditions upon impact of the pulp suspension jet on the wire are crucial for the dewatering of the pulp suspension and for the nature of the filing of the fibers on the wire.
  • the angle and orientation of the fibers within the fibrous web are decisive for various properties, and in the case of paper materials, in particular, also for the curvature tendency of the paper web.
  • the advantage of this type of nozzle design also lies in the flexible adjustment of beam angle, beam length and / or Strahlauf Economicswinkel while maintaining a headbox geometry.
  • the degree of freedom achieved allows an optimization of the properties of the fiber mat in relation to the initial sheet formation. Such a positioning is for example in the German patent application DE 10 2010 041 331 A1 disclosed.
  • the covering of the stationary and preferably evacuated screening table preferably comprises at least two zones, each having a plurality of strips, the strips arranged in the first zone having an average spacing in the range between 20 and 70 mm, preferably between 20 and 40 mm, in particular between 20 and 35 mm, and wherein the bars arranged in the second zone are arranged with an average pitch in the range between 50 and 120 mm, preferably between 50 and 100 mm, in particular between 50 and 80 mm.
  • the retention can be significantly improved and adapted approximately to the level of a forming roller.
  • the pressure profile over a stationary that is, in operation of the sheet forming system dewatering element with drainage holes depending on the geometry of different profiles, in particular with regard to the height and the gradients occurring pressure peaks and their frequency.
  • This different maximum pressure level decisively influences the retention.
  • the vacuum pulses between the overpressure pulses that is, the amplitudes and the gradients of these high vacuum values, can be decisively influenced by the number of drainage bars per unit length, that is to say by the division.
  • the maximum flow rate in the fiber mat and the compression state are essential.
  • the shortest possible discharge points along the drainage section should be present, which by the inventive design of the divisions in the range between 20 and 70 mm, preferably between 20 and 40 mm, in particular between 20 and 35 mm, or between 50 and 120 mm, preferably between 50 and 100 mm, in particular between 50 and 80 mm.
  • the strips forming the covering and arranged in a zone of the stationary and preferably evacuated screening table preferably have a respective divider spacing in the range from 15 to 120 mm, preferably from 50 to 100 mm, in particular from 50 to 90 mm, and / or a respective last width at least 3 mm, preferably at least 10 mm, in particular at least 15 mm.
  • the individual strips of the covering of the stationary and preferably evacuated screening table can be arranged with a constant or approximately constant strip division in at least one individual zone of the covering of the stationary and preferably evacuated screening table or over the entire stationary and preferably evacuated screening table.
  • the strips forming the covering and arranged in a zone of the stationary and preferably evacuated screening table can also have a respective strip width of at least 3 mm, preferably of at least 10 mm, in particular of at least 15 mm, in order thereby to ensure adequate guidance and stabilization of the screen guarantee.
  • the summed last width of the surface of the individual strips touching the sieve is preferably smaller than the summed opening width of the individual drainage openings.
  • the summed opening width of the individual drainage openings preferably assumes a value in the range of 90 to 230% of the summed last width of the surface of the individual strips touching the four-wire sieve.
  • the summed opening width of the individual dewatering apertures preferably takes a value in the range of 100 to 400% of the summed last width of the longitudinal contacting surface of the individual Last.
  • the surface of the lining of the stationary and preferably evacuated screening table is preferably curved at least in regions.
  • the curvature of the surface of the covering of the stationary and preferably evacuated sieve table describing at least partially curvature radius preferably takes a value in the range between 0.3 and 5.0 m, preferably between 0.6 and 3.0 m, in particular between 1 , 0 and 2.0 m, on. The greater curvature allows a higher dewatering pressure on the at least one pulp suspension due to the acting screen tension to achieve the same dewatering performance as on a forming roll.
  • the at least one separating element arranged in the headbox nozzle of the two-layer or multi-layer headbox preferably has a separating element projection in the range from 3 to 50 mm, preferably from 5 to 35 mm, in particular from 10 to 25 mm.
  • the separating element of the two- or multi-layer headbox designed in this way affords the advantage that the layer purity in the vertical direction can again markedly be improved in comparison with known multilayer headboxes. This is in principle due to the fact that the pressure loss and thus the fluid wall friction on the separating element can be reduced by shortening the separating element projection. Associated with this is a reduction of the turbulence forming in the pulp suspension streams with concomitant improvement of the layer purity in the height direction.
  • the downstream separator end region of the separator preferably has a separator end angle in the range from 1 to 10 °, preferably from 1.5 to 8 °, in particular 2.5 to 5 °, on. In addition, these angular ranges avoid adverse mixing of the two adjacent pulp suspensions.
  • the separating element is preferably a CFRP lamella which has a minimum rigidity both in the longitudinal direction and in the transverse direction, which assumes a value of at least 40 N / mm in certain areas. This minimum stiffness has a positive effect on both the coverage quality and the layer purity of the two- or multi-layer fibrous web to be produced.
  • the separating element can be articulated and thus freely movable in the headbox nozzle or rigidly by means of an upstreamly mounted separating element receiving means.
  • the sheet forming system according to the invention can also be used in an outstanding manner in a machine for producing a fibrous web, in particular an at least one-layered paper, board or packaging paper web, from at least one fibrous stock suspension.
  • the machine can be constructed according to the prior art and have all known machine areas.
  • FIG. 1 shows a schematic longitudinal section through the downstream end portion 32 of a known two-layer headbox 4 for a not shown machine 100 for producing a fibrous web from at least one pulp suspension.
  • the headbox 4 has a two-layer headbox nozzle 5, whose lower outer wall 26.1 in its downstream end portion 32, also referred to in professional circles as a lower lip, has a straight contour 33. If such a two-layer headbox 4 is used with a wire section in the form of a wire or hybrid former, this lower outer wall 26.1 of the headbox nozzle 5 usually faces the wire.
  • FIG. 2 shows a further schematic longitudinal section through the downstream end portion 32 of a known two-layer headbox 4 for a machine 100 not shown in detail for producing a fibrous web of at least one pulp suspension.
  • This headbox 4 in turn has a two-layer headbox nozzle 5, whose lower outer wall 26.1 in its downstream end portion 32, also known as lower lip in the art, a downstream bevel 34 in the range of 1 to 5 ° (angle 34.W) in order to avoid a convergent area has between separating element 23 and lower outer wall 26.1 at the nozzle outlet.
  • a downstream bevel 34 in the range of 1 to 5 ° (angle 34.W) in order to avoid a convergent area has between separating element 23 and lower outer wall 26.1 at the nozzle outlet.
  • For a convergent zone would initiate a bending moment in the tip 23.s of the separating element 23, since ambient pressure already acts on it on the opposite side of the tip 23.s of the separating element 23.
  • FIG. 3 1 shows a schematic partial side view of an embodiment of a sheet forming system 1 according to the invention for a machine 100 (not shown) for producing a fibrous web 2 (dashed representation) from at least one fibrous stock suspension 3.
  • the fibrous web 2 (dashed representation) to be produced may in particular be a paper, Carton or packaging paper web.
  • the sheet-forming system 1 has a two-layer, possibly also multi-layer headbox 4 with a headbox nozzle 5 and a wire section 6.
  • the wire section 6 comprises a first endless sieve 7 circulating in a sieve loop, this sieve 7 being a sieve 7.1, which passes in a pre-dewatering section 8 towards or in the region of application of the at least one fibrous suspension 3 as pulp suspension jet 3.
  • a stationary and preferably evacuated screening table 9 the surface of which touches the wire screen 7 7 of a covering 11 with several in the wire direction, ie machine direction MD (arrow) successively arranged and in the cross machine direction CD (arrow) extending strips 12 with intermediate free drainage holes 13th is formed, and a plurality of suction elements 14, in particular suction boxes 14.1 is guided.
  • the upper sieve 15.1 runs after the pre-dewatering section 8 in a wedge-shaped inlet gap 17 on the uppermost pulp suspension 3.
  • the two sieves 7.1, 15.1 at least in sections form a double-wire zone 16, wherein in the twin-wire zone 16, the upper wire 15.1 guided via an inlet roller 18 runs over a plurality of rigidly arranged strips 19, which are arranged at a mutual spacing on a drainage box 20.
  • the rigidly arranged strips 19 of the dewatering box 20 describe in the manner shown in the machine direction MD (arrow), that is to say wire direction extending curvature 19.K or they are arranged in a manner not shown along a machine direction MD (arrow), that is Sieblaufraum extending straight ,
  • the two sieves 7.1, 15.1 with the at least one intermediate pulp suspension 3 are after the drainage box 20 and within the Twin-wire zone 16 over several known in the art and thus not explicitly shown drainage elements. Thereafter, the screen separation takes place in a known manner, so that the fibrous web 2 to be produced (dashed line) can be supplied to only one sieve of a press section (not shown) of a machine 100 for producing a fibrous web.
  • the four-wire sieve 7.1 additionally runs over a plurality of strips 21.1, which are mutually arranged rigidly on the dewatering box 20 strips 19, which are supported by resilient elements 22 and with a selectable force 22.F (arrow) against the wire 7.1 are pressed.
  • the wire 7 in the region of the wedge-shaped inlet gap 17, can run over at least one strip 21.2 indicated only by dashed lines, which can be pressed against the wire 7 with a selectable force 22.F (arrow).
  • a selectable force 22.F arrow
  • the entire two-layer headbox 4, preferably a part of the two-layer headbox 4, in particular the headbox 5 of the two-layer headbox 4, for varying the beam angle 3.SW and / or the Strahlauf Economicsline 3.SL while maintaining a preferably unchanged geometry of the headbox 5 of the two-layer headbox 4 can be positioned.
  • At least the entire headbox 5 of the two-layer headbox 4 is a straight line G (arrow) running transversely to the wire screen 7.1, in particular the jet impact line 3.SL and / or one in the area of the two-layer headbox 4, in particular in the area of Headbox 5 of the two-layer headbox 4 lying straight line G (arrow) from 0.1 to 5 °, preferably from 0.1 to 3 °, in particular from 0.1 to 2 °, rotatable.
  • Such a positioning is for example in the German patent application DE 10 2010 041 332 A1 disclosed.
  • FIG. 3a shows a schematic longitudinal section through the downstream end portion 23 of the two-layer headbox 4 in the FIG. 3 illustrated preferred embodiment of the sheet forming system 1 according to the invention for a machine 100 not shown in detail for producing a fibrous web of at least one pulp suspension.
  • the headbox 5 of the two-layer headbox 4 has two over the width B (arrow) of the headbox 4 extending, separated by a separator 23, during operation of the two-layer headbox 4 each have a pulp suspension 3 as pulp suspension stream 3.1, 3.2 (arrows) leading and converging nozzle chambers 24.1, 24.2.
  • the separating element may be articulated or rigidly mounted upstream.
  • the separating element 23 arranged in the headbox 5 of the two-layer headbox 4 has a separating element protrusion 23.Ü in the range of 3 to 50 mm, preferably of 5 to 35 mm, in particular of 10 to 25 mm, and / or a Trennelementendwinkel 23.W in the range of 1 to 10 °, preferably from 1.5 to 8 °, in particular 2.5 to 5 °, on.
  • the separating element 23 itself is a CFRP lamella which has a minimum stiffness 23.R both in the longitudinal direction (machine direction MD (arrow)) and in the transverse direction (machine transverse direction CD (arrow)), which at least has a value of ⁇ 40 N / mm accepts.
  • Each nozzle chamber 24.1, 24.2 has downstream each one over the width B (arrow) of the headbox 4 extending outlet gap 25.1, 25.2, wherein the two nozzle chambers 24.1, 24.2 on the outside each have an outer wall 26.1, 26.2.
  • This diaphragm 27 has an aperture angle 27.W of ⁇ 15 °, preferably 20 °, in particular of ⁇ 25 °, wherein the aperture angle 27.W the deviating angle between the inner surface 28 of the longitudinal wire 7, 7.1 facing outer wall 26.1 and the inner, preferably facing the inner surface 28 of the wire 7, 7.1 facing outer wall 26.1 immediately adjacent Aperture surface 27.1 of the aperture 27 is.
  • this panel 27 on the lower, the only indicated Sieve 7.1 facing outer wall 26.1 a diaphragm board 27.V of ⁇ 1 mm, preferably of ⁇ 2 mm, in particular of ⁇ 3 mm, on the diaphragm board 27.V the length of inner, facing the inner surface 28 of the only indicated Sieve 7.1 facing outer wall 26.1 is preferably immediately adjacent aperture face 27.1.
  • the arranged on the lower, the only indicated Sieve 7.1 facing outer wall 26.1 arranged aperture 27 may be connected to the lower outer wall 26.1, in particular screwed, but it may also be integrally formed with the lower outer wall 26.1.
  • At least one nozzle chamber may be provided with at least one blade known to a person skilled in the art, which preferably ends in the nozzle chamber.
  • at least one blade known to a person skilled in the art, which preferably ends in the nozzle chamber.
  • two slats 29 and in the upper nozzle chamber 24.2 a blade 29 are indicated in the lower nozzle chamber 24.1.
  • a diaphragm 30 may be arranged on the upper, the longitudinal sieve 7.1 facing away from outer wall 26.2.
  • This further diaphragm 30 may moreover have the same positioning and / or dimensioning as the diaphragm 27 arranged on the lower outer wall 26.1 facing the wire screen 7.1.
  • the further and on the upper, the wire screen 7.1 facing away from outer wall 26.2 arranged aperture 30, which has a diaphragm board and a diaphragm immersion depth and during operation of the two-layer headbox having at least two surfaces contacted by a pulp suspension, an upstream ramp surface and a downstream major surface, also have between the ramp surface and the main surface at least one refractive surface contacted by a pulp suspension during operation of the two-layer headbox.
  • Such an embodiment of the further panel 30 is for example from the document DE 10 2009 027 079 A1 known.
  • FIG. 4 shows a schematic longitudinal partial sectional view of a first embodiment of a stationary and preferably evacuated screening table 9 of the sheet forming system 1 according to the invention for a machine 100 not shown in detail for producing a fibrous web from at least one pulp suspension.
  • the lining 11 of the stationary and preferably evacuated screening table 9 comprises two zones 9Z1, 9.Z2 each having a plurality of strips 12.
  • the pad 11 may also include more than the two exemplified zones.
  • the strips 12 arranged in the first zone 9.Z1 are arranged with an average pitch 9.Z1.TD in the range between 20 and 70 mm, preferably between 20 and 40 mm, in particular between 20 and 35 mm.
  • the strips 12 arranged in the second zone 9.Z2 are arranged with an average pitch 9.Z2.TD in the range between 50 and 120 mm, preferably between 50 and 100 mm, in particular between 50 and 80 mm.
  • a closed box 31 preferably of a single, not shown in more detail, but known in the art vacuum source with a preferably controllable / controllable vacuum can be acted upon.
  • the individual strips 12 of the covering 11 of the stationary and preferably evacuated screening table 9 are in a constant or approximately constant strip division 9.T1, 9.T2 in at least one individual zone 9.Z1, 9.Z2 of the covering 11 of the stationary and preferably evacuated screening table 9 or arranged over the entire screen table 9 away.
  • the strips 12 of the stationary and preferably evacuated screening table 9 have a respective strip pitch 9.T1, 9.T2 in the range from 50 to 120 mm, preferably from 50 to 100 mm, in particular from 50 to 90 mm.
  • the individual strips 12 are aligned with respect to the touched by the wire screen 7 surface 10 of the lining 11 of the stationary and preferably suctioned Siebticians 9 inclined, that is, they extend obliquely to the same.
  • the alignment is carried out obliquely in the machine direction MD (arrow), that is to say the direction of sweeping in an alignment angle 12.W, which assumes a constant or varying value shown in the machine direction MD (arrow), that is to say the direction of sweeping.
  • the surface 10 of the covering 11 of the stationary and preferably evacuated screening table 9 may be curved at least in regions.
  • at least one, the at least partially curvature of the surface 10 of the pad 11 of the stationary and preferably evacuated Siebticians 9 descriptive radius of curvature has a value in the range between 0.3 and 5.0 m, preferably between 0.6 and 3.0 m, in particular between 1.0 and 2.0 m.
  • the surface of the individual elements 7 and 9, ZZ, arranged in a zone 9.Z1, 9.Z2, of the covering 11 of the stationary and preferably evacuated screening table 9 has a respective strip width 12.B of at least 3 mm, preferably of at least 10 mm , in particular of at least 15 mm. It is in at least a single zone 9.Z1, 9.Z2 of the Pads 11 of the stationary and preferably evacuated Siebticians 9 or over the entire Siebtisch 9 away constant or approximately constant.
  • the summed opening width 13.BS of the individual drainage openings 13 takes a value in the range of 90 to 230% of the summed strip width 12.BS of the surface touching the wire screen 7.1 10 of the individual strips 12 at.
  • the summed opening width 13.BS of the individual drainage openings 13 takes a value in the range of 100 to 400% of the summed strip width 12.BS of the surface touching the wire screen 7.1 10 of the individual strips 12 at.
  • the covering 11 of the stationary and preferably evacuated screening table 9 comprising at least two zones 9.Z1, 9.Z2 can be zonal in terms of design, arrangement and / or orientation of the individual strips 12 and / or drainage openings 13.
  • FIG. 4a shows a bottom view of the in the FIG. 4 illustrated first embodiment of a stationary and preferably evacuated Siebticians 9 of the sheet forming system 1 according to the invention for a machine 100 not shown in detail for producing a fibrous web from at least one pulp suspension.
  • the drainage openings 13 of the covering 11 of the stationary and preferably evacuated screening table 9 extend substantially over the entire width 11 .B of the lining 11, but at least over the effective on the pulp suspension Width 9.B of the stationary and preferably evacuated screening table 9.
  • the drainage openings 13 are preferably designed as slots.
  • the FIG. 5 shows a schematic longitudinal partial sectional view of a second embodiment of a stationary and preferably evacuated Siebticians 9 of the sheet forming system 1 according to the invention for a machine 100 not shown in detail for producing a fibrous web from at least one pulp suspension.
  • the illustrated stationary and preferably suctioned Siebtisch 9 for example, in turn, a part of the in the FIG. 3 be illustrated sheet forming system 1.
  • the lining 11 of the stationary and preferably evacuated screening table 9 in turn comprises two zones 9.Z1, 9.Z2 each having a plurality of strips 12.
  • the strips 12 arranged in the first zone 9.Z1 are arranged with an average pitch 9.Z1.TD in the range between 20 and 70 mm, preferably between 20 and 40 mm, in particular between 20 and 35 mm.
  • the strips 12 arranged in the second zone 9.Z2 are arranged with an average pitch 9.Z2.TD in the range between 50 and 120 mm, preferably between 50 and 100 mm, in particular between 50 and 80 mm.
  • the stationary and preferably evacuated screening table 9 is again provided with a closed box 31, which can be acted upon by preferably a single, not shown, known in the art vacuum source with a preferably controllable / vacuum controllable.
  • the individual strips 12 of the covering 11 of the stationary and preferably evacuated screening table 9 are also in a constant or approximately constant line pitch 9.T1, 9.T2 in at least a single zone 9.Z1, 9.Z2 of the lining 11 of the stationary and preferably evacuated Sieve table 9 or arranged over the entire screen table 9 away.
  • the strips 12 of the stationary and preferably evacuated screening table 9 have a respective strip pitch 9.T1, 9.T2 in the range from 50 to 120 mm, preferably from 50 to 100 mm, in particular from 50 to 90 mm.
  • the individual strips 12 are aligned with respect to the touched by the wire screen 7 surface 10 of the lining 11 of the stationary and preferably suctioned Siebticians 9 inclined, that is, they extend obliquely to the same.
  • the alignment is carried out obliquely in the machine direction MD (arrow), that is to say the direction of sweeping in an alignment angle 12.W, which assumes a constant or varying value shown in the machine direction MD (arrow), that is to say the direction of sweeping.
  • the surface 10 of the covering 11 of the stationary and preferably evacuated screening table 9 may be curved at least in regions.
  • at least one, the at least partially curvature of the surface 10 of the pad 11 of the stationary and preferably evacuated Siebticians 9 descriptive radius of curvature has a value in the range between 0.3 and 5.0 m, preferably between 0.6 and 3.0 m, in particular between 1.0 and 2.0 m.
  • the surface of the individual elements 7 and 9.Z2 arranged in a zone 9.Z1, 9.Z2 of the covering 11 of the stationary and preferably evacuated screening table 9 again has a respective strip width 12.B of at least 3 mm, preferably of at least 10 mm, in particular of at least 15 mm, on. It is constant or approximately constant in at least one individual zone 9.Z1, 10.Z2 of the lining 11 of the stationary and preferably evacuated sieve table 9 or over the entire sieve table 9.
  • the summed strip width 12.BS of the wire brush 7.1 touching surface 10 of the individual strips 12 is smaller than the summed opening width 13.BS of the individual drainage openings 13.
  • the summed opening width 13.BS of the individual increases Drainage holes 13 a value in the range of 100 to 400% of the summed strip width 12.BS of the longitudinal wire 7.1 touching surface 10 of the individual strips 12 at.
  • the summed opening width 13.BS of the individual drainage openings 13 takes a value in the range of 90 to 230% of the summed strip width 12.BS of the surface touching the wire screen 7.1 10 of the individual strips 12 at.
  • the covering 11 of the stationary and preferably evacuated screening table 9 comprising at least two zones 9.Z1, 9.Z2 can be zonal in terms of design, arrangement and / or orientation of the individual strips 12 and / or drainage openings 13.
  • FIG. 6 shows a generated with a known screen table 9.1 first waveform V1 in the pulp suspension with reference to a diagram.
  • the abscissa of the diagram represents the dewatering path s, whereas the positive ordinate represents an overpressure Pü and the negative ordinate represents a negative pressure Pu, ie a vacuum.
  • the respective positive oscillation surface is a drainage region, the retention level of which can be set via the height of the oscillation amplitude.
  • the respectively negative oscillation surface causes a loosening of the fiber mat forming from the at least one pulp suspension as a result of the acting negative pressure. In addition, a worse filter effect is generated here.
  • FIG. 7 shows a generated with a known screen table 9.2 second waveform V2, V3 in the pulp suspension with reference to a diagram.
  • the abscissa of the diagram in turn represents the dewatering section s, whereas the positive ordinate again represents an overpressure Pü and the negative ordinate again represents a negative pressure Pu, ie a vacuum.
  • FIG. 8 shows a vibration curve V9 generated in the pulp suspension with a stationary and preferably vacuumed screen table 9 of a sheet forming system 1 according to the invention on the basis of a diagram.
  • the abscissa of the diagram represents the Entskyssanssumble s and the machine direction MD (arrow), that is Sieblaufraum, whereas the positive ordinate represents an overpressure Pu and the negative ordinate represents a negative pressure Pu, so a vacuum.
  • the lining 11 of the stationary and preferably evacuated screening table 9 in at least two zones 9.Z1, 9.Z2 each having a plurality of strips 12 has vibrations S9 with different oscillation amplitudes S9.A in the at least one on the at least one screen introduced pulp suspension produced such that the generated in the first zone 9.Z1 in the at least one pulp suspension vibration widths S9.B the vibrations S9 are smaller than the vibration generated in the second zone 9.Z2 in the at least one pulp suspension vibration widths S9.B the vibrations S9.
  • the oscillation amplitudes S9.A of the oscillations S9 generated in the first zone 9.Z1 of the lining 11 of the stationary and preferably evacuated screening table 9 are in the range from 2 to 8 kPa, preferably 4 kPa, and those in the second zone 9.Z2 of FIG Pads 11 of the stationary and preferably evacuated Siebticians 9 generated vibration amplitudes S9.A the vibrations S9 are in the range of 5 to 20 kPa, preferably from 8 to 10 kPa.
  • the number of vibrations S9 generated in the at least one pulp suspension in the first zone 9.Z1 of the lining 11 of the stationary and preferably evacuated sieving table 9 assumes a value in the range from 2 to 20, preferably from 4 to 10.
  • the number of oscillations S9 generated in the at least one pulp suspension in the second zone 9.Z2 of the lining 11 of the stationary and preferably evacuated screening table 9 has a value in the range from 1 to 7, preferably from 2 to 3.
  • vibration widths S9.B of the vibrations S9 generated in the at least one pulp suspension in the first zone 9.Z1 are smaller than the vibration widths S9.B of the vibrations S9 generated in the second zone 9.Z2 in the at least one pulp suspension.
  • FIG. 9 finally shows a diagram pitch width vibration amplitude for a stationary and preferably evacuated drainage element of a sheet forming system according to the invention.
  • the abscissa of the graph represents the pitch width TB at a constant ratio of opening width ⁇ B to pitch width TB, whereas the ordinate represents the vibration amplitude SA.
  • the sheet forming system 1 according to the invention is also particularly suitable for use in a machine 100 for producing a two- or multi-layer fibrous web 2, in particular paper, board or packaging paper web, from at least one pulp suspension 3 (cf. FIG. 3 ).
  • the invention provides an improved sheet forming system which appreciably improves the coverage qualities of at least the two outer layers of the two- or multi-layer fibrous web as compared to known sheet forming systems. It is also possible to produce a two- or multi-layer fibrous web having a weight per unit area in the range from 20 to 60 g / m 2 per pulp suspension layer at a production rate of more than 900 m / min, preferably more than 1200 m / min.

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Claims (14)

  1. Système (1) de formation de feuilles pour machine (100) de fabrication d'une nappe (2) de matière fibreuse en deux ou plusieurs couches, en particulier d'une nappe de papier, de carton ou de papier d'emballage, à partir d'au moins une suspension (3) de matière fibreuse,
    le système comprenant un déversoir (4) de matière en deux ou plusieurs couches présentant une tuyère (5) de déverse de matière qui présente au moins deux espaces de tuyère (24.1, 24.2) s'étendant sur la largeur (B) de le déversoir (4) de matière, séparés l'un de l'autre par au moins un élément de séparation (23), conduisant chacun une suspension (3) de matière fibreuse sous la forme d'écoulements (3.1, 3.2) de suspension de matière fibreuse lorsque le déversoir (4) de matière en deux ou plusieurs couches est en fonctionnement et convergeant l'un vers l'autre, présentant en aval un interstice de sortie (25.1, 25.2) qui s'étend sur la largeur (B) du déversoir (4) de matière,
    chacun des deux espaces extérieurs de tuyère (24.1, 24.2) présentant du côté extérieur une paroi extérieure (26.1, 26.2),
    un écran (27; 30) étant disposé du côté de la sortie sur au moins une paroi extérieure (26.1, 26.2) et une partie de tamis (6) qui comporte au moins un tamis (7, 7.1, 15, 15.1) circulant en boucle fermée,
    le ou les tamis (7) étant des tamis allongés (7.1) formés dans un parcours (8) de pré-essorage, après ou au niveau de l'amenée de la ou des suspensions (3) de matière fibreuse en tant que jets libres (3.S) de suspension de matière fibreuse au moyen du déversoir (4) de matière en deux ou plusieurs couches, guidés au-dessus d'une table de tamis (9) stationnaire et de préférence en dépression, dont la surface (10) en contact avec le tamis allongé (7, 7.1) est formée d'un revêtement (11) présentant plusieurs lattes (12) disposées les unes derrière les autres dans la direction d'avancement (MD) du tamis et s'étendant dans la direction transversale (CD) par rapport à la machine, entre lesquelles sont situées des ouvertures libres (13) d'évacuation d'eau, et plusieurs éléments d'aspiration (14), en particulier des caissons d'aspiration (14.1),
    caractérisé en ce que
    l'écran (27) est disposé sur la paroi extérieure inférieure (26.1) tournée vers le tamis allongé (7, 7.1),
    en ce que l'écran (27) présente sur la paroi extérieure inférieure (26.1), tournée vers le tamis allongé (7, 7.1), un angle d'écran (27.W) ≥ 15°, de préférence ≥ 20° et en particulier ≥ 25°,
    en ce que l'angle d'écran (27.W) est l'angle d'écartement entre une surface intérieure (28), tournée vers les espaces de tuyère (24.1, 24.2), de la paroi extérieure (26.1) tournée vers le tamis allongé (7, 7.1), et la une surface (27.1) de l'écran (27), qui se raccorde de préférence directement à la surface intérieure (28) de la paroi extérieure (26.1) tournée vers le tamis allongé (7, 7.1),
    en ce que sur la paroi extérieure inférieure (26.1), tournée vers le tamis allongé (7, 7.1), l'écran (27) présente un débord (27.V) ≥ 1 mm, de préférence ≥ 2 mm et en particulier de ≥ 3 mm,
    en ce que les débords (27.V) de l'écran est la longueur de la surface intérieure (27.1) de l'écran qui se raccorde de préférence directement à la surface intérieure (28) de la paroi extérieure (26.1) tournée vers le tamis allongé (7, 7.1) et
    en ce que la tuyère (5) du déversoir (4) de matière en deux ou plusieurs couches peut être positionnée en respectant une géométrie inchangée de la tuyère (5) du déversoir (4) de matière en deux ou plusieurs couches de manière à modifier l'angle (3.SW) d'incidence du jet et/ou la ligne (3.SL) d'incidence du jet sur le tamis allongé (7.1).
  2. Système (1) de formation de feuilles selon la revendication 1, caractérisé en ce qu'un écran (30) est disposé sur la paroi extérieure supérieure (26.2) non tournée vers le tamis allongé (7, 7.1) et présente de préférence le même positionnement et/ou le même dimensionnement que l'écran (27) disposé sur la paroi extérieure inférieure (26.1) tournée vers le tamis allongé (7, 7.1).
  3. Système (1) de formation de feuilles selon la revendication 1, caractérisé en ce qu'un écran (30) est disposé sur la paroi extérieure supérieure (26.2) non tournée vers le tamis allongé (7, 7.1), présente un débord d'écran et une profondeur de pénétration d'écran, et lorsque le déversoir (4) de matière en deux ou plusieurs couches est en fonctionnement, présente au moins deux surfaces en contact avec une suspension (3) de matière fibreuse, une surface de déversement amont et une surface principale aval, de préférence au moins une surface de rupture en contact avec une suspension (3) de matière fibreuse étant prévue sur l'écran (30) entre la surface de déversement de cet écran (30) et la surface principale de cet écran (30), de préférence au moins pendant la fonctionnement du déversoir (4) de matière en deux ou plusieurs couches.
  4. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que la partie (6) formant tamis comporte deux tamis sans fin (7, 7.1, 15, 15.1) circulant en boucle fermée, le deuxième tamis supérieur (15, 15.1) aboutissant sur la suspension supérieure (3) de matière fibreuse après le parcours (8) de pré-essorage et les deux tamis (7, 7.1, 15, 15.1) formant ensuite au moins en partie une zone (16) à double tamis et en ce que dans la zone (16) à double tamis, le tamis allongé (7, 7.1) passe au-dessus de plusieurs languettes (21.1) disposées de chaque côté de languettes (19) disposées fixement sur un caisson d'essorage (20) et soutenues au moyen d'éléments déformables (22) et qui peuvent être repoussées contre le tamis allongé (7, 7.1) par une force sélectionnable (22.F).
  5. Système (1) de formation de feuilles selon la revendication 1, caractérisé en ce qu'au moins la totalité de la tuyère (5) du déversoir (4) de matière en deux ou plusieurs couches peut tourner autour d'une droite (G) qui s'étend transversalement par rapport au tamis (7, 7.1), en particulier la ligne (3.SL) d'incidence du jet, et/ou autour d'une droite (G) située au niveau du déversoir (4) de matière en deux ou plusieurs couches, en particulier au niveau de la tuyère (5) du déversoir (4) de matière en deux ou plusieurs couches, sur 0,1 à 5°, de préférence sur 0,1 à 3° et en particulier sur 0,1 à 2°.
  6. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que la garniture (11) de la table (9) de tamis stationnaire et de préférence en dépression comporte au moins deux zones (9.Z1, 9.Z2) qui présentent chacune plusieurs languettes (12), les languettes (12) disposées dans la première zone (9.Z1) étant disposées à un pas moyen (9.Z1.TD) de l'ordre de 20 à 70 mm, de préférence de 20 à 40 mm et en particulier de 20 à 35 mm et les languettes (12) disposées dans la deuxième zone (9.Z2) étant disposées à un pas moyen (9.Z2.TD) de l'ordre de 50 à 120 mm, de préférence de 50 à 100 mm et en particulier de 50 à 80 mm.
  7. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que les languettes (12) de la table de tamis (9) stationnaire et de préférence en dépression qui forment la garniture (11) et qui sont disposées dans une zone (9.Z1, 9.Z2) présentent un pas respectif (9.T1, 9.T2) de l'ordre de 15 à 120 mm, de préférence de 50 à 100 mm, en particulier de 50 à 90 mm et/ou une largeur (12.B) de languette d'au moins 3 mm, de préférence d'au moins 10 mm et en particulier d'au moins 15 mm.
  8. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que dans au moins l'une des zones (9.Z1, 9.Z2) de la garniture (11) de la table de tamis (9) stationnaire et de préférence en dépression ou au-delà de la table de tamis (9) stationnaire et de préférence en dépression, la somme des largeurs (12.BS) de la surface des différentes languettes (12) en contact avec le tamis (7, 7.1) est inférieure à la somme de la largeur des ouvertures (13.BS) des différentes ouvertures (13) d'évacuation d'eau.
  9. Système (1) de formation de feuilles selon la revendication 8, caractérisé en ce que dans une première zone (9.Z1) de la garniture (11) de la table de tamis (9) stationnaire et de préférence en dépression, la somme des largeurs (13.BS) des différentes ouvertures (13) d'évacuation d'eau représente une valeur de l'ordre de 90 à 230 % de la somme (12.BS) des surfaces (10) des différentes languettes (12) en contact avec le tamis allongé (7, 7.1) et en ce que dans une deuxième zone (9.Z2) de la garniture (11) de la table de tamis (9) stationnaire et de préférence en dépression, la somme des largeurs (13.BS) des différentes ouvertures (13) d'évacuation d'eau prend une valeur de l'ordre de 100 à 400 % de la somme des largeurs (12.BS) des surfaces (10) des différentes languettes (12) en contact avec le tamis allongé (7, 7.1).
  10. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que la surface (10) de la garniture (11) de la table de tamis (9) stationnaire et de préférence en dépression est courbe au moins par parties et en ce qu'au moins un rayon de courbure qui décrit la courbure non partielle de la surface (10) de la garniture (11) de la table de tamis (9) stationnaire et de préférence en dépression prend une valeur de l'ordre de 0,3 à 5,0 m, de préférence de 0,6 à 3,0 m et en particulier de 1,0 à 2,0 m.
  11. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que l'élément de séparation (23) disposé dans la tuyère (5) du déversoir (4) de matière en deux ou plusieurs couches présente un débord (23.Ü) d'élément de séparation de l'ordre de 3 à 50 mm, de préférence de 5 à 35 mm et en particulier de 10 à 25 mm.
  12. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que l'élément de séparation (23) présente un angle (23.W) d'élément de séparation compris dans la plage de 1 à 10°, de préférence de 1,5 à 8° et en particulier de 2,5 à 5°.
  13. Système (1) de formation de feuilles selon l'une des revendications précédentes, caractérisé en ce que l'élément de séparation (23) est une lamelle CFK qui présente tant dans la direction longitudinale (MD) que dans la direction transversale (CD) une rigidité minimale (23.R) qui prend dans certaines parties une valeur au moins ≥ 40 N/mm.
  14. Machine de fabrication d'une nappe (2) de matière fibreuse en deux ou plusieurs couches, en particulier d'une nappe de papier, de carton ou de papier d'emballage, à partir d'au moins une suspension (3) de matière fibreuse,
    caractérisée en ce que
    elle comporte un système (1) de formation de feuilles selon l'une des revendications précédentes.
EP12732825.0A 2011-08-04 2012-06-27 Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus Active EP2739780B1 (fr)

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DE201110080424 DE102011080424A1 (de) 2011-08-04 2011-08-04 Blattbildungssystem für eine Maschine zur Herstellung einer zwei- oder mehrschichtigen Faserstoffbahn
PCT/EP2012/062437 WO2013017344A1 (fr) 2011-08-04 2012-06-27 Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus

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DE102015223662A1 (de) * 2015-11-30 2017-06-14 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn
DE102015223663A1 (de) * 2015-11-30 2017-06-01 Voith Patent Gmbh Vorrichtung zur herstellung einer faserstoffbahn
DE102015223664A1 (de) * 2015-11-30 2017-06-01 Voith Patent Gmbh Vorrichtung und verfahren zur herstellung einer faserstoffbahn
DE102016121039A1 (de) * 2016-11-04 2018-05-09 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
US11035078B2 (en) 2018-03-07 2021-06-15 Gpcp Ip Holdings Llc Low lint multi-ply paper products having a first stratified base sheet and a second stratified base sheet
CA3034832A1 (fr) 2018-03-07 2019-09-07 Gpcp Ip Holdings Llc Produits de papier peu pelucheux et methodes de fabrication connexes
DE102019126296A1 (de) * 2019-09-30 2021-04-01 Voith Patent Gmbh Lamelle für einen Stoffauflauf und Verfahren zur Herstellung einer Lamelle
EP4127290A4 (fr) * 2020-03-31 2024-04-03 Kimberly-Clark Worldwide, Inc. Procédé et appareil de production d'un substrat en zones et/ou en couches

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DE202009005580U1 (de) * 2009-04-14 2009-06-18 Metso Paper, Inc. Stoffauflaufdüse
DE102009027079A1 (de) 2009-06-22 2010-12-23 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
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DE102011080424A1 (de) 2013-02-07
WO2013017344A1 (fr) 2013-02-07
EP2739780A1 (fr) 2014-06-11

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