EP2739780A1 - 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

Info

Publication number
EP2739780A1
EP2739780A1 EP12732825.0A EP12732825A EP2739780A1 EP 2739780 A1 EP2739780 A1 EP 2739780A1 EP 12732825 A EP12732825 A EP 12732825A EP 2739780 A1 EP2739780 A1 EP 2739780A1
Authority
EP
European Patent Office
Prior art keywords
headbox
wire
forming system
sheet forming
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.)
Granted
Application number
EP12732825.0A
Other languages
German (de)
English (en)
Other versions
EP2739780B1 (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
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2739780A1 publication Critical patent/EP2739780A1/fr
Application granted granted Critical
Publication of EP2739780B1 publication Critical patent/EP2739780B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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 Faserstoffsuspen- sion, comprising a two- or multi-layer headbox with a headbox, the at least two on the width of 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 a pulp suspension flow leading and converging nozzle chambers, each having a downstream over the width of the headbox exit gap, wherein the downstream both outer nozzle spaces on the outside each having an outer wall and wherein on at least one outer wall outlet side, a diaphragm is arranged, and a wire section, the uml at least one in a wire loop aufendes 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 fiber suspension as a pulp
  • FIG. 8 of 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 wire of the screen section designed as a longitudinal wire former is in a pre-dewatering section after or in the area of application of the at least one fiber suspension as a fibrous suspension jet by means of the three-layer headbox via a stationary and preferably evacuated screen, whose surface contacting the longitudinal wire is covered by a lining with several layers Sieblaufraum successively arranged and extending in the cross-machine direction strips is formed with intermediate free drainage holes, and several suction elements, in particular suction boxes out.
  • a straight lower lip or, as shown in FIG. 2 a lower lip with a downstream bevel in the range from 1 to 5 is usually formed on the outer wall of the headbox facing the headbox of a two- or multilayer headbox ° used to avoid a convergent area 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 separator, since on the opposite side of the top of the separator already ambient pressure acts on them.
  • 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 diaphragm is arranged on the lower, the wire screen facing outer wall, that the diaphragm on the lower, the wire screen facing outer wall a diaphragm angle of> 15 °, preferably from> 20 °, in particular of> 25 °, wherein the aperture angle is the deviating angle between the inner surface of the longitudinal wire facing outer wall and the inner, preferably facing the inner surface of the wire facing outer wall aperture surface of the aperture, and that the aperture on the lower, the wire screen facing outer wall a diaphragm board of> 1 mm, preferably of> 2 mm, in particular of> 3 mm, wherein the diaphragm board, the length of the inner, preferably facing the inner surface of the wire facing outer wall immediately adjacent diaphragm surface is.
  • the object of the invention is completely solved in this way.
  • 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 clear contraction smooths out the relevant surface of the pulp suspension jet, as has been proven in numerous test series, 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 refractive surface of the upper orifice between the run-up surface of the orifice and its main surface effectively avoids 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 separations, 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 any essential role more.
  • Such an embodiment of the upper panel is known, for example, from the publication DE 10 2009 027 079 A1, the content of which is hereby made the subject of the present description.
  • 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 path 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 entire two-layer or multi-layer headbox preferably a part of the two- or multi-layer headbox, in particular the headbox of the two- or multi-layer headbox, is preferably for maintaining the Strahlauf Economicswinkels and / or Strahlauf Economicsline while maintaining a preferably unchanged geometry of the headbox of Two- or multi-layer headbox positionable.
  • This embodiment thus combines the headbox of the two- or multi-layer headbox with a variability in the jet impact angle or in the jet impact line on the wire in order to ensure optimum jet injection of the pulp suspension jet.
  • the covering of the stationary and preferably eviscerated sieve preferably comprises at least two zones each having a plurality of strips, the strips arranged in the first zone having an average pitch 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 roll.
  • 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 compaction state are essential for retention.
  • 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 sieve touching surface of the individual strips preferably smaller than the summed opening width of the individual drainage openings. Furthermore, in the first zone of the lining of the stationary and preferably evacuated sieving table, 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 drainage openings preferably takes a value in the range of 100 to 400% of the summed strip width of the surface of the individual touching the wire Last.
  • This embodiment causes in the initial region of the drainage of at least one introduced pulp suspension better and more effective extraction of air bubbles contained in it. This effectively prevents the formation of bright spots in the fibrous web to be produced.
  • 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- 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 separating element preferably has a separating end angle in the range from 1 to 10 °, preferably from 1.5 to 8 °. especially 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 at least a value of> 40 N / mm in some 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.
  • Figure 1 is a schematic longitudinal section through the downstream
  • FIG. 2 shows a further schematic longitudinal section through the downstream end region of a known two-layer headbox
  • Figure 3 is a schematic partial side view of a preferred embodiment of a sheet forming system according to the invention
  • 3a shows a schematic longitudinal section through the downstream end region of the two-layer headbox of the preferred embodiment of the sheet forming system according to the invention shown in FIG. 3;
  • Figure 4 is a schematic longitudinal partial sectional view of a first
  • FIG. 4 a shows a bottom view of the first embodiment of a stationary and preferably evacuated drainage element of the sheet forming system according to the invention shown in FIG. 4;
  • Figure 5 is a schematic longitudinal section of a second preferred embodiment of a stationary and preferably evacuated drainage element of the sheet formation system according to the invention;
  • FIG. 6 shows a first course of vibration in the pulp suspension produced with a known stationary and preferably evacuated drainage element on the basis of a diagram
  • FIG. 7 shows a second oscillation profile in the pulp suspension produced with a known stationary and preferably drawn-off dewatering element on the basis of a diagram
  • Figure 8 one with a stationary and preferably evacuated
  • Dewatering element of a sheet forming system generated vibration waveform in the Faserstoffsuspen- sion on the basis of a diagram
  • FIG. 9 shows a diagram of the pitch width oscillation width for a stationary and preferably evacuated drainage element of a sheet forming system according to the invention.
  • 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 mesh 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 region 32 of a known two-layer headbox 4 for a machine 100 (not shown) for producing a fibrous web from at least one pulp suspension.
  • This headbox 4 in turn has a two-layer headbox 5, the 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 Be - Rich between separating element 23 and lower outer wall 26.1 has at the nozzle exit. Because a convergent zone would initiate a bending moment in the tip 23. S of the separating element 23, since on the opposite side of the tip 23. S of the separating element 23, ambient pressure already acts on it.
  • FIG. 3 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 in detail for producing a fibrous web 2 (dashed line) of at least one pulp suspension 3.
  • a fibrous web 2 (dashed line) may be in particular a Act paper, cardboard 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 is in a pre-dewatering section 8 after or in the region of application of the at least one fibrous suspension 3 as pulp suspension jet 3.
  • this sieve 7 being a sieve 7.1 which is in a pre-dewatering section 8 after or in the region of application of the at least one fibrous suspension 3 as pulp suspension jet 3.
  • the longitudinal sieve 7.1 contacting surface 10 of a covering 1 1 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 intervening free drainage holes 13 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, which is 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 fibrous stock suspension 3 in between are located 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 wire 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 on the drainage box 20 arranged strips 19, which are supported by means of resilient elements 22 and with a selectable force 22. F (arrow) against the wire screen 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).
  • Such embodiments are described in the publication DE 10 2009 027 432 A1, the content of which is hereby made the subject of the present description.
  • 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 disclosed, for example, in German Patent Application DE 10 2010 041 332.1 from 24.09.2010, the content of which is hereby made the subject of the present description.
  • FIG 3a shows a schematic longitudinal section through the downstream end portion 23 of the two-layer headbox 4 of the preferred embodiment shown in Figure 3 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 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.sub.U in the range from 3 to 50 mm, preferably from 5 to 35 mm, in particular from 10 to 25 mm, and / or a separating element end angle 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. At the bottom, the only indicated sieve 7.1 facing outer wall 26.1 a shutter 27 is arranged on the outlet side.
  • This diaphragm 27 has a diaphragm angle 27.W of> 15 °, preferably of> 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.
  • 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 also be arranged on the upper outer wall 26. 2 facing away from the longitudinal sieve 7.1. 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 known, for example, from the document DE 10 2009 027 079 A1, the content of which is hereby made the subject of the present description.
  • FIG. 4 shows a schematic longitudinal partial sectional view of a first embodiment of a stationary and preferably evacuated Siebticians 9 of the sheet forming system 1 according to the invention for a machine not shown 100 for producing a fibrous web from at least one Faserstoffsuspen- sion.
  • the shown stationary and preferably evacuated screening table 9 can be, for example, a part of the sheet forming system 1 shown in FIG. 3 for a machine 100 (not shown) for producing a fibrous web from at least one pulp suspension.
  • the covering 1 1 of the stationary and preferably evacuated screening table 9 comprises two zones 9.Z1, 9.Z2 each having a plurality of strips 12.
  • the covering 1 1 may also include more than the two zones exemplified.
  • 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 division of forces 9.T1, 9.T2 in at least one individual zone 9.Z1, 9.Z2 of the lining 11 of the stationary one and preferably suctioned Siebticians 9 or arranged over the entire screen table 9 away.
  • the strips 12 of the stationary and preferably suctioned screening table 9 have a respective strip spacing 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 strainer 7.1 surface 10 of the pad 1 1 of the stationary and preferably evacuated 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 1 1 of the stationary and preferably evacuated screening table 9 may be curved at least in regions.
  • At least one curvature of curvature describing the surface 10 of the covering 11 of the stationary and, preferably, evacuated sieve table 9, at least in regions, can have 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, accept.
  • the surface of the individual elements 7, 9, and 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, on. It is in at least a single zone 9.Z1, 9.Z2 of the Pads 1 1 of the stationary and preferably evacuated Siebticians 9 or over the entire screen table 9 away constant or approximately constant. Also, in at least one individual zone 9.Z1, 9.Z2 of the covering 11 of the stationary and preferably evacuated screening table 9 or over the entire screening table 9, the summed last width 12. BS of the surface 10 of the individual strips contacting the four-wire sieve 7.1 12 smaller than the summed opening width 13. BS of the individual drainage holes 13.
  • the summed opening width 13 BS of the individual drainage openings 13 has a value in the range of 90 to 230% of the summed last 12.
  • the summed opening width 13.sub.BS of the individual drainage openings 13 takes a value in the range of 100 to 400% of the summed strip width 12.sub.BS of the four-wire screen 7.1 touching surface 10 of the individual strips 12 at.
  • the at least two zones 9.Z1, 9.Z2 comprehensive covering 1 1 of the stationary and preferably evacuated Siebticians 9 zonal be different in terms of design, arrangement and / or orientation of the individual strips 12 and / or drainage holes 13th
  • FIG. 4a shows a bottom view of the first embodiment shown in FIG. 4 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) for producing a fibrous web from at least one fibrous stock suspension.
  • the drainage openings 13 of the covering 11 of the stationary and preferably evacuated screening table 9 extend essentially over the entire width 11 1 .B of the lining 11, but at least over the fiber suspension acting on the fibrous suspension. same width 9.B of the stationary and preferably evacuated Siebticians 9.
  • the drainage holes 13 are preferably designed as slots.
  • FIG. 5 shows a schematic longitudinal partial section illustration of a second 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) for producing a fibrous web from at least one pulp suspension.
  • the shown stationary and preferably evacuated screening table 9 can, for example, again be part of the sheet forming system 1 shown in FIG.
  • the covering 1 1 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 1 1 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 pad 1 1 of the stationary and preferably suctioned Siebticians 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 strainer 7.1 surface 10 of the pad 1 1 of the stationary and preferably evacuated 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 1 1 of the stationary and preferably evacuated screening table 9 may be curved at least in regions.
  • at least one curvature of curvature describing the surface 10 of the covering 11 of the stationary and, preferably, evacuated sieve table 9, at least in regions can have 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, accept.
  • the surface of the individual elements 7 and 9, arranged in a zone 9.Z1, 9.Z2, of the covering 11 of the stationary and preferably evacuated screening table 9, in turn, has a respective strip width
  • the summed opening width 13 In addition, in the first zone 9.Z1 of the lining 11 of the stationary and preferably evacuated sieving table 9, the summed opening width 13. Individual drainage openings 13 have a value in the range of 100 to 400% of the summed strip width 12. BS of the surface 7 of the individual strips 12 contacting the wire screen 7. And in the second zone 9.Z2 of the covering 11 of the stationary and preferably evacuated screening table 9, 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 last width 12. BS of the four-wire 7.1 touching surface 10 of the individual strips 12 at.
  • the at least two zones 9.Z1, 9.Z2 comprehensive covering 1 1 of the stationary and preferably evacuated Siebticians 9 zonal be different in terms of design, arrangement and / or orientation of the individual strips 12 and / or drainage holes 13th
  • FIG. 6 shows a first vibration profile V1 generated in the pulp suspension with a known sieve table 9.1 on the basis of 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.
  • FIG. 7 shows a second oscillation profile V2, V3 generated in the pulp suspension with a known sieve table 9.2 on the basis of a diagram.
  • the abscissa of the Diagrannnns again represents the Entskysstechniksumble s, whereas the positive ordinate again an overpressure Pu and the negative ordinate again represents a vacuum Pu, so a vacuum.
  • FIG. 8 shows a vibration course V9 in the pulp suspension produced with a stationary and preferably evacuated screening 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 vibration amplitudes S9.A of the vibrations 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 the pad 1 1 of the stationary and preferably sucked screen table 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 oscillations S9 generated in the at least one pulp suspension in the first zone 9.Z1 of the covering 11 of the stationary and preferably evacuated screening 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 sieving table 9 assumes a value in the range from 1 to 7, preferably from 2 to 3.
  • the oscillation widths S9.B of the oscillations S9 generated in the first zone 9.Z1 in the at least one fiber suspension are smaller than the oscillation widths S9.B of the oscillations S9 generated in the second zone 9.Z2 in the at least one pulp suspension.
  • the higher oscillation widths with high pressure pulses present in the first zone of the lining of the stationary and preferably evacuated drainage element cause the air bubbles to be pressed out of the at least one pulp suspension.
  • the low oscillation width present in the second zone of the lining of the stationary and preferably evacuated drainage element causes a high retention in the at least one pulp suspension.
  • FIG. 9 shows a diagram of pitch width oscillation 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.
  • a pitch width TB can be seen below which the preferred pitch width TB.Z1 for the first zone 9.Z1 of the lining of the stationary and preferably evacuated drainage element and above which the preferred pitch width TB.Z2 for the second zone of the lining 9.Z2 the stationary and preferably evacuated Siebticians is.
  • 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 (see FIG.
  • 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 in comparison with 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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Abstract

L'invention concerne un système de formation de feuille (1) pour une machine (100) de fabrication d'une bande de matière fibreuse (3) à deux couches ou plus, à partir d'au moins une suspension de fibres (3), comprenant une arrivée de matière (4) à deux couches ou plus, avec une buse de sortie de matière (5) qui comprend au moins deux espaces de buse (24.1, 24.2), qui sont séparés l'un de l'autre par au moins un élément séparateur (23), qui transportent chacun une suspension de fibres (3) formant un flux de suspension de fibres (3.1, 3.2) et qui possèdent chacun en aval une fente de sortie (25.1, 25.2) s'étendant sur la largeur (B) de l'arrivée de matière (4). Les deux espaces de buse (24.1, 24.2) extérieurs possèdent extérieurement une paroi extérieure (26.1, 26.2). Au moins une paroi extérieure (26.1, 26.2) possède sur le côté de sortie un étranglement (27 ; 30). Un tamis longitudinal sur la paroi extérieure inférieure (26.1) tournée vers le tamis longitudinal (7, 7.1) présente un angle d'étranglement (27.W) supérieur à 15° et l'étranglement (27) possède une saillie (27.V) supérieure à 1 mm.
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)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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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EP2739780A1 true EP2739780A1 (fr) 2014-06-11
EP2739780B1 EP2739780B1 (fr) 2017-01-04

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EP (1) EP2739780B1 (fr)
CN (1) CN103717801A (fr)
DE (1) DE102011080424A1 (fr)
WO (1) WO2013017344A1 (fr)

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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
DE102019126296A1 (de) * 2019-09-30 2021-04-01 Voith Patent Gmbh Lamelle für einen Stoffauflauf und Verfahren zur Herstellung einer Lamelle
WO2021202637A1 (fr) * 2020-03-31 2021-10-07 Kimberly-Clark Worldwide, Inc. Procédé et appareil de production d'un substrat en zones et/ou en couches

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DE19538149A1 (de) 1995-10-13 1997-04-17 Voith Sulzer Papiermasch Gmbh Verfahren und Stoffauflauf für eine Papier- oder Kartonmaschine zur Herstellung einer mindestens dreischichtigen Bahn
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
DE102009027432A1 (de) * 2009-07-02 2011-01-05 Voith Patent Gmbh Formiereinheit und Verfahren zur Herstellung einer Materialbahn
DE102010041332A1 (de) 2010-09-24 2012-01-19 Voith Patent Gmbh Blattbildungssystem

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WO2013017344A1 (fr) 2013-02-07
DE102011080424A1 (de) 2013-02-07
CN103717801A (zh) 2014-04-09
EP2739780B1 (fr) 2017-01-04

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