EP1659211A2 - Système de formation d'une machine pour fabriquer une bande fibreuse - Google Patents

Système de formation d'une machine pour fabriquer une bande fibreuse Download PDF

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Publication number
EP1659211A2
EP1659211A2 EP05110889A EP05110889A EP1659211A2 EP 1659211 A2 EP1659211 A2 EP 1659211A2 EP 05110889 A EP05110889 A EP 05110889A EP 05110889 A EP05110889 A EP 05110889A EP 1659211 A2 EP1659211 A2 EP 1659211A2
Authority
EP
European Patent Office
Prior art keywords
equal
forming system
sheet forming
less
pulp suspension
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
EP05110889A
Other languages
German (de)
English (en)
Other versions
EP1659211A3 (fr
EP1659211B1 (fr
Inventor
Wolfgang Ruf
Hans Loser
Volker Schmidt-Rohr
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
Voith Paper 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, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1659211A2 publication Critical patent/EP1659211A2/fr
Publication of EP1659211A3 publication Critical patent/EP1659211A3/fr
Application granted granted Critical
Publication of EP1659211B1 publication Critical patent/EP1659211B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a sheet forming system of a machine for producing a fibrous web, in particular paper or board web, from at least one pulp suspension, with a headbox having a turbulence generator and a headbox downstream of the turbulence generator in the flow direction of the at least one pulp suspension, and with a sieve unit with two circulating endless screens, both of which run over a peripheral region of a respective deflecting element, in particular a breast roll, which then at least until reaching a forming device, in particular a forming shoe, to form a wedge-shaped Stoffeinlaufspalts, directly the at least one of a headbox as pulp suspension jet discharged pulp suspension at training respective beam impingement points on the two wires receives, converge and then form a Doppelsieb zone, in which the two screens and the at least one intervening fibrous suspension are passed over a plurality of forming and dewatering elements.
  • FIG. 3 of German Offenlegungsschrift DE 102 02 137 A1 shows such a strip gap former.
  • the drainage of the introduced pulp suspension begins on a stocked with ceramic strips Box, over whose curved surface the two sieves converge and thus the first drainage takes place.
  • the box may, depending on the embodiment, be designed to be open or closed to the environment. In a closed box, the use of vacuum is also possible. It may also be individual ceramic strips, which are preferably mounted on support ribs.
  • the respective ratio of lamella length to nozzle length is greater than / equal to 0.5, preferably greater than / equal to 0.8, that the headbox a Endkonvergenz in the ratio of total immersion depth of has at least one aperture to gap opening greater than or equal to 1, preferably greater than / equal to 2, and that the pulp suspension jet has a free jet length less than or equal to 300 mm, preferably greater than / equal to 50 mm and less than / equal to 200 mm.
  • the said final convergence that is, the nozzle end geometry of the headbox, produces a smoother radiant surface which results in less air entrapment and less air entrainment and thereby avoiding bright spots in the fibrous web.
  • a strong re-flocculation in the free jet is prevented due to a short residence time of the flocs in the free jet.
  • the minimum free jet length ensures a robust construction of the headbox nozzle with a gap geometry determining, for example, the basis weight transverse profile, which can be kept constant even with changing throughputs and speeds.
  • the combination according to the invention of the mentioned features thus ensures the production of a fibrous web with markedly reduced formation disturbances and flatness problems, which as a rule result from turbulence structures in the fibrous suspension jet.
  • the headbox nozzle preferably has a ratio of lower lip board to gap opening less than or equal to 2. This ratio ensures, inter alia, still sufficient guidance of the pulp suspension jet after leaving the headbox.
  • the headbox has on both sides in each case a diaphragm with a respective immersion depth. This results in a very smooth radiation surface, which leads to significantly less air bubbles and significantly less air entrainment and thereby to avoid light spots in the fibrous web. In addition, the generation of a possible symmetrical structure of the fibrous web is positively supported.
  • the forming device is preferably designed as a forming shoe with a covering having a plurality of strips arranged one after the other in the direction of wire flow, with free drainage openings lying therebetween, which contact the rotating wire with a respectively stationary and open surface. This ensures that the air possibly entrained in the material inlet gap at the jet injection of the pulp suspension, both in the pulp suspension jet and in the sieves, can be sufficiently removed on both sides by the two sieves.
  • the first strip is preferably arranged at a distance of less than or equal to 400 mm from the first strip edge of the forming shoe, whereas the last effective strip is preferably arranged at a distance of less than or equal to 500 mm from the first strip edge of the forming shoe.
  • This arrangement area favors in particular the increased removal of accumulating white water.
  • the term "effective" in this context means that the last bar is still located at the point at which at least some of the fibers are still mobile. This is the case with a mean consistency of the fibrous web to be produced of approximately less than 4%, ie 40 g / l.
  • the first strip has, compared to the known prior art, a small distance from the first strip edge of the forming shoe. It is already arranged in a region of low consistency of the fibrous web to be produced. Thereby the possibility of a better influence on the formation of the fibrous web is taken. This is made possible in particular by a short free jet length of the pulp suspension jet. moreover The parameters described in terms of pulp suspension jet and headbox have a very positive effect.
  • the headbox advantageously has a throughput of pulp suspension of greater than or equal to 12,000 l / m / min, preferably of greater than or equal to 15,000 l / m / min. Among other things, this throughput allows optimal matching of the aforementioned parameters.
  • the two deflection elements for the two continuous endless screens are preferably designed as breast rolls having a respective roll diameter of less than or equal to 300 mm, preferably less than or equal to 200 mm, in particular less than or equal to 100 mm ,
  • the respective breast roll may be supported against the force of the wire tension by at least one hydrostatic thrust bearing or it may be formed as a deflection-controlled roller.
  • a hydrostatic pressure bearing of the breast roll in particular a plurality of hydrostatic pressure bearings for supporting the breast roll are provided, which are preferably arranged at the same or approximately the same distance along the machine width.
  • At least one conditioning shoe is preferably arranged between the deflecting element and the forming device, in particular the forming shoe, and / or between the deflecting element and the plurality of strips, the at least one suction chamber with a covering having a plurality of strips arranged in succession in the wire-winding direction with free drainage openings located therebetween is that touch the circulating endless sieve with a respective fixed and open surface.
  • the conditioning shoe can also be designed generally as a conditioning device. It primarily causes a suction of air-white water from the adjacent sieve and thus an improvement in the drainage performance of the same.
  • the conditioning shoe is regularly and controllably evacuated by means of at least one vacuum source with a vacuum ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa.
  • a preferably machine-wide spray tube may be provided, which is directed into the gusset formed by the continuous endless sieve and the first strip of the conditioning shoe.
  • At least the first strip of the conditioning shoe is integrated in the outlet side run of the hydrostatic pressure bearing of the breast roll.
  • the pulp suspension jet preferably has a jet velocity greater than or equal to 1,500 m / min, with wood-containing varieties a jet speed greater than or equal to 2,000 m / min and for carton and packaging papers a jet speed greater than or equal to 800 m / min, preferably greater than / equal to 1,200 m / min.
  • a small tenacity ratio preferably in the range less than or equal to 2 can be achieved.
  • FIG. 1 shows a schematic partial representation of an exemplary embodiment of a sheet forming system 1 according to the invention of a machine for production a fibrous web.
  • the fibrous web may in particular be a paper or board web.
  • the sheet forming system 1 comprises a headbox 2, which has a turbulence generator 3 and a headbox nozzle 4 downstream of the turbulence generator 3 in the flow direction T (arrow) of the at least one pulp suspension F.
  • the headbox 2 can according to the known prior art with a sectioned consistency control (dilution water technology, "ModuleJet") for adjusting the basis weight cross-profile, as it is known for example from German Patent DE 40 19 593 C2, provided.
  • the headbox 2 can also be designed as a multilayer headbox (dashed line) with at least one separating element, so that multi-layer fibrous webs with different layer qualities can be produced.
  • the sheet forming system 1 comprises a screening unit 5 with two circumferential endless screens 6, 7, both of which run over a peripheral region 12, 13 of a respective deflecting element 8, 9, in particular a breast roll 10, 11.
  • the two wires 6, 7 then run at least until reaching a forming device 14, in particular a forming shoe 14.1, forming a wedge-shaped Stoffeinlaufspalts 15, the at least one of a headbox 2 as a pulp suspension jet 16 discharged pulp suspension F at training respective Strahlauf Economics concerning P 1 , P 2 on the two wires 6, 7, together.
  • the two screens 6, 7 form a Doppelsieb zone 17, in which the two wires 6, 7 and the at least one intermediate fibrous suspension F over several, not further shown forming and drainage elements are performed.
  • the twin-wire section 17 can be vertical, quasi-vertical, oblique, approximately horizontal or even horizontal.
  • a plurality of fins 18 are now arranged, whose respective ratio L L / L D is greater than / equal to 0.5, preferably greater than / equal to 0.8, where L L is the respective lamella length and L D is the nozzle length.
  • the headbox 4 has a final convergence E in the ratio r / s greater than or equal to 1, preferably greater than / equal to 2, where r is the total immersion depth of the at least one aperture and s is the gap opening (see FIG.
  • the pulp suspension jet 16 also has a free jet length L F less than or equal to 300 mm, preferably greater than or equal to 50 mm and less than or equal to 200 mm. In this case, the earlier Strahlauf Hughes P 1 , P 2 are both on the wire 6 and on the sieve 7.
  • FIG. 2 shows a schematic longitudinal section through the end region of a headbox nozzle 4 of a sheet forming system 1 according to the invention.
  • the headbox nozzle 4 has a final convergence E in the ratio r / s greater than or equal to 1, preferably greater than / equal to 2, where r is the total immersion depth of the at least one aperture 19 and s is the gap opening. Furthermore, the headbox 4 has a ratio L / s less than or equal to 2, where L is the lower lip board and s in turn is the gap opening. In a further embodiment, the headbox 4 can also have on both sides in each case a diaphragm with a respective immersion depth.
  • the headbox 2 itself has a throughput Q of pulp suspension F of greater than or equal to 12,000 l / m / min, preferably greater than or equal to 15,000 l / m / min.
  • FIG. 3 shows a schematic partial representation of a second exemplary embodiment of a sheet forming system 1 according to the invention of a machine for producing a fibrous web.
  • the forming device 14 is formed as a forming shoe 14.1 with a covering 20 having a plurality of in the wire direction S (arrow) successively arranged strips 21 with intermediate free drainage openings 22 which touch the rotating screen 6 with a respective stationary and open surface 23.
  • the first strip 24.1 is arranged at a distance A 1 of less than / equal to 400 mm from the first strip edge 25 of the forming shoe 14.1, whereas the last effective strip 24.N at a distance AN of less than / equal to 500 mm from the first strip edge 25 of the forming shoe 14.1 is arranged.
  • the strips 24, which can preferably be pressed on flexibly, are arranged at least partially opposite the free drainage openings 22 of the forming shoe 14.1.
  • the two deflecting elements 8, 9 for the two continuous endless screens 6, 7 are formed as breast rolls 10, 11 which have a respective roll diameter D W10 , D W11 less than or equal to 300 mm, preferably less than or equal to 200 mm, in particular less than or equal to 100 mm, have.
  • the respective breast roll 10, 11 is supported against the force of the wire tension by at least one hydrostatic pressure bearing 26 (arrow).
  • a plurality of hydrostatic pressure bearings 26 are preferably provided for supporting the respective breast roll 10, 11, which are preferably arranged at the same or approximately the same distance along the machine width B (arrow).
  • Such pressure bearing a breast roll is known for example from German patent application DE 41 05 215 A1, the content of which is hereby made the subject of the present description.
  • the respective breast roll 10, 11 may be formed in a further, but not shown embodiment as a deflection-controlled roll ("Nipco-P-roll").
  • a Konditionierschuh 27, 28 are arranged, each having at least one suction chamber 29, 30 with a coating 31, 32 with a plurality of strips 33 arranged one after the other in the direction of the wire run S (arrow) are formed with free drainage openings 34 located therebetween, which contact the adjacent wire 6, 7 with a respectively stationary and open surface 35.
  • the respective conditioning shoe 27, 28 is regularly and controllably evacuated by means of at least one vacuum source 36 with a vacuum V ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa.
  • a preferably machine-wide spray tube 37 is provided which is directed into the gusset 40, 41 formed by the continuous endless screen 6, 7 and the first strip 38, 39 of the conditioning shoe 27, 28.
  • FIG. 5 shows a schematic partial representation of a third exemplary embodiment of a sheet forming system 1 according to the invention of a machine for producing a multilayer fibrous web.
  • FIG. 5 shows a schematic partial representation of a third exemplary embodiment of a sheet forming system 1 according to the invention of a machine for producing a multilayer fibrous web.
  • a Konditionierschuh 27, 28 are arranged, each having at least one suction chamber 29, 30 with a coating 31, 32 with a plurality of strips 33 arranged one after the other in the direction of the wire run S (arrow) are formed with free drainage openings 34 located therebetween, which contact the adjacent wire 6, 7 with a respectively stationary and open surface 35.
  • the respective conditioning shoe 27, 28 is again regularly and controllably evacuated by means of at least one vacuum source 36 with a vacuum V ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa.
  • At least the first strip 24.1 of the respective conditioning shoe 27, 28 is integrated into the outlet side run of the corresponding hydrostatic pressure bearing 26 of the respective breast roll 10, 11.
  • All illustrated embodiments have in common that the pulp suspension jet 16 in wood-free varieties a residence time t v to reach the immobility point of less than / equal to 12 ms, preferably less than / equal to 9 ms, in particular of less than / equal to 3 ms, with woody varieties a residence time t v until reaching the immobility point of less than or equal to 9 ms, preferably less than or equal to 6 ms, in particular of less than / equal to 2 ms, and for cardboard and packaging papers, a residence time t v until reaching the immobility point of less than or equal to 19 ms, preferably less than or equal to 12 ms.
  • the residence time t v is in principle the time required by the pulp suspension jet 16 from the exit from the headbox 4 until it reaches the immobility point.
  • all illustrated embodiments have in common that the pulp suspension jet 16 in wood-free varieties a jet velocity V 16 greater than or equal to 1,500 m / min, woody varieties a jet velocity V 16 g rumbleer / equal to 2,000 m / min and cardboard and packaging papers a jet velocity V 16 g r deviser / equal to 800 m / min, preferably greater than / equal to 1,200 m / min.
  • the invention provides a sheet forming system for a fibrous web making machine that significantly reduces formation and flatness problems due to turbulence structures in the pulp suspension jet.

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  • Nonwoven Fabrics (AREA)
  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP05110889A 2004-11-23 2005-11-17 Système de formation d'une machine pour fabriquer une bande fibreuse Not-in-force EP1659211B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004000054A DE102004000054A1 (de) 2004-11-23 2004-11-23 Blattbildungssystem einer Maschine zur Herstellung einer Faserstoffbahn

Publications (3)

Publication Number Publication Date
EP1659211A2 true EP1659211A2 (fr) 2006-05-24
EP1659211A3 EP1659211A3 (fr) 2006-05-31
EP1659211B1 EP1659211B1 (fr) 2007-10-03

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EP05110889A Not-in-force EP1659211B1 (fr) 2004-11-23 2005-11-17 Système de formation d'une machine pour fabriquer une bande fibreuse

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EP (1) EP1659211B1 (fr)
AT (1) ATE374858T1 (fr)
DE (2) DE102004000054A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007017208A1 (fr) * 2005-08-05 2007-02-15 Voith Patent Gmbh Mouleur a tamis double d'une machine de fabrication d'une bande fibreuse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005420A1 (de) * 1990-02-21 1991-08-29 Voith Gmbh J M Doppelsiebformer
US5201999A (en) * 1991-06-10 1993-04-13 Beloit Technologies, Inc. Twin wire forming apparatus
EP0603142A1 (fr) * 1992-12-08 1994-06-22 Valmet Paper Machinery Inc. Procédé et dispositif se rapportant à la gorge d'entrée dans la section de formage d'une machine à papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005420A1 (de) * 1990-02-21 1991-08-29 Voith Gmbh J M Doppelsiebformer
US5201999A (en) * 1991-06-10 1993-04-13 Beloit Technologies, Inc. Twin wire forming apparatus
EP0603142A1 (fr) * 1992-12-08 1994-06-22 Valmet Paper Machinery Inc. Procédé et dispositif se rapportant à la gorge d'entrée dans la section de formage d'une machine à papier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007017208A1 (fr) * 2005-08-05 2007-02-15 Voith Patent Gmbh Mouleur a tamis double d'une machine de fabrication d'une bande fibreuse

Also Published As

Publication number Publication date
DE102004000054A1 (de) 2006-05-24
EP1659211A3 (fr) 2006-05-31
EP1659211B1 (fr) 2007-10-03
DE502005001614D1 (de) 2007-11-15
ATE374858T1 (de) 2007-10-15

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