EP1382740A1 - Section de formage pour la production d'une bande fibreuse multicouche - Google Patents

Section de formage pour la production d'une bande fibreuse multicouche Download PDF

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Publication number
EP1382740A1
EP1382740A1 EP03102033A EP03102033A EP1382740A1 EP 1382740 A1 EP1382740 A1 EP 1382740A1 EP 03102033 A EP03102033 A EP 03102033A EP 03102033 A EP03102033 A EP 03102033A EP 1382740 A1 EP1382740 A1 EP 1382740A1
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EP
European Patent Office
Prior art keywords
section
sieve
wire
sieve section
twin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03102033A
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German (de)
English (en)
Inventor
Jürgen Prössl
Alfred Dr. Bubik
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 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1382740A1 publication Critical patent/EP1382740A1/fr
Ceased legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • 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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the invention relates to a wire section for producing a multilayer fibrous web, in particular a paper or cardboard web, from at least one Fibrous suspension according to the preamble of claim 1.
  • Such a wire section is from German published application DE 196 51 493 A1 (PB10449 DE) of the applicant known.
  • the screen section shown includes a belt on which at least a first fiber layer runs in, a twin-wire section with a forming roller and with a first and a second Sieve (upper sieve, lower sieve), which together form a double sieve zone form, in which a second fibrous layer is produced, and a merging section with a lower vertex where the first and the second fiber layer combined to produce a multi-layer fiber web become.
  • This known wire section has the disadvantage that differential speeds occur between the two screens of the twin wire section in the area of the twin wire zone. Such an occurrence of differential speeds can be attributed to the low frictional connection between the two sieves in said zone and increases with increasing basis weight of the fibrous suspension or increasing height of the fibrous suspension between the two sieves. The resulting differential speeds significantly worsen the sheet production conditions and promote screen wear on both screens, making the manufacture of a high-quality fibrous web noticeably more difficult.
  • This object is achieved according to the invention in a wire section of the type mentioned at the outset in that the two screens are guided in the area of the twin wire zone over a peripheral area of at least one folding device.
  • This has the advantage that due to the fact that the fibrous web has already been largely or preferably completely completed, there is an intimate frictional connection between the two sieves both in the web area and in the two edge regions, and that this intimate frictional connection largely prevents the occurrence of said differential speeds.
  • This enables the production of a high-quality fibrous web with good runability.
  • the arrangement of such a folding device also creates space for further devices.
  • Such a device can be, for example, a water collection and water drainage basin, in which the white water falling down can easily be collected and discharged. This again ensures trouble-free operation of the wire section without defects in the fiber layer.
  • the buckling device is a buckling roller formed because of possible rotation due to the rotation of the roller body on the touched screen is largely avoided.
  • buckling device on which has a value in the range from 20 ° to 180 °, preferably from 30 ° up to 150 °.
  • the buckling device is advantageously arranged such that the two Sieves on the common rollers and one in the twin-wire zone have the same direction of buckling.
  • the buckling device can be in the loop of the first Sieve (top sieve) as well as in that of the second sieve (bottom sieve), with an arrangement in the loop of the second sieve (top sieve) the drain point of the two screens from the forming roller in the direction of the belt or after the point of contact or in the area of the point of contact of the two screens lies on the buckling device.
  • These types of arrangement stand out in particular by enabling a compact structure of the Twin-wire section from.
  • At least one water collection and Drainage basins within the lower two quadrants of the To arrange kinking device are at least one water collection and Drainage basins within the lower two quadrants of the To arrange kinking device.
  • the separation is carried out by at least one separating suction device, the separation is carried out by a suction, preferably in some areas Merging section or the separation takes place when it expires from the Articulation. All three options are characterized by one high process reliability, which means that the fibrous web remains in place on the top sieve, with gentle treatment of the first layer of fiber produced out.
  • the fiber suspension can be introduced into the twin wire section in the running direction or against the direction of the belt. Both types provide the advantage of not extending the wire section, the introduction is more advantageous in the running direction from a spatial point of view.
  • the buckling device according to the invention is in the first embodiment as a full roll formed with a preferably smooth surface, in a second and third embodiment the buckling device can also have a grooved and / or drilled surface have or be formed as a forming or suction roll. Any execution the buckling device has characteristic features and is suitable thereby each for a special application.
  • the merging section is preferably formed by a rubber roller, since the merging of the first and second layers of fibrous material can be achieved by means of a rubber roller can be easily and structurally solved.
  • the twin-wire section has a forming roller which, according to the invention, advantageously has a diameter of more than 1,200 mm, preferably more than 1,635 mm, in particular more than 1,760 mm.
  • This forming roller is ideally designed as an open roller and opened up by means of a grill or honeycomb structure and / or it is a suction roller.
  • the above-mentioned elements are largely known and tested and therefore have increased functional reliability and low acquisition costs, and possibly also low operating costs.
  • the Forming roller has a drainage capacity that has a value of at least 50%, preferably at least 65%, of the total drainage capacity has the twin-wire section.
  • the components can then be used for the remaining drainage together with the associated construction height in terms of quantity and constructively smaller than usual.
  • the twin-wire section is placed on the belt as a unit.
  • the twin wire section of the wire section according to the invention for retrofitting from existing screen sections.
  • the wire section according to the invention is suitable on the basis of those described above Excellent properties also for use with a Sieve section rebuild, as there are usually existing structural conditions, for example hall dimensions, must be taken into account and thereby the screen section conversion should not require any additional space, for example due to an increased height of the screen section to be installed.
  • the present invention is not only in the manufacture of two-layer fibrous webs, but also in the case of three or more layers Fiber webs can be used.
  • the screen section 1 shown for producing a multi-layer fibrous web 2, in particular a paper or cardboard web, from at least one fiber suspension 3.1, 3.2, comprises a belt 4 on which at least a first layer of fibrous material 5 arrives, a twin wire section 6 with a first and a second Sieve (upper sieve, lower sieve) 7, 8, in which a second fiber layer 9 is produced and a merging section 10 having a lower vertex 11, in which the first and the second fiber layer 5, 9 producing a multilayer fibrous web 2 are merged.
  • "tape” is generally the covering of a Understood paper or board machine, for example a sieve.
  • a headbox 12 for applying at least one fiber suspension 3.1, which is used to produce the first fiber layer 5 is provided on the tape 4.
  • the tape 4 is after application of the Fibrous suspension 3.1 over several schematically indicated forming and Drainage elements 13 guided, with at least one other Headbox at least one additional layer of fiber suspension for formation at least one further fiber layer is applied to the first fiber layer 5 can be.
  • the twin wire section 6 has a first wire (top wire) 7 and a second wire (bottom wire) 8, which are guided in parallel in a twin wire zone 6.1 for forming the second fiber layer 9.
  • the two screens 7, 8 form an inlet gap 14.
  • a headbox 15 which is only indicated schematically, is provided, by means of which at least one fibrous suspension 3.2 for the second fibrous layer 9 enters the inlet gap 14 is shot in the running direction L (arrow) of the band 4. Because of this type of headbox 15, the twin-wire section 6 is a so-called "gap former".
  • the two headboxes 12, 15 can also be equipped as multi-layer headboxes and / or as headboxes with sectionally controllable dilution water technology (system "ModuleJet” - DE 40 19 593 A1 (PA04598 DE) of the applicant).
  • Screen 8 is a preferably driven forming roller 16 and on the top screen trained first screen 7, a screen guide roller 17 is provided.
  • the forming roller 16 has a suction area 18 which extends over the circumference the forming roller 16 approximately from the area of the entry nip 14 to approximately the point extends, on which the two forming rollers 16 wrapping sieves 7, 8 of the forming roller 16 are removed.
  • the sieves 7, 8 run in an upper one Section of the forming roller 16 between this and the opposite Wire guide roller 17 together and loop around the forming roller at an angle, which is less than 120 °, preferably less than 90 °.
  • a dewatering section 19 immediately adjoins the forming roller 16 in the form of a so-called D-part.
  • the D part 19 points in the area of the first Siebs (top sieve) 7 a schematically indicated suction box 20 with a Row of fixed strips.
  • the suction box 20 is a combined one Vacuum cleaner designed.
  • the forming strips of the suction box 20 preferably form a slightly convex tread in the running direction of the sieves 7, 8.
  • the first sieve (top sieve) 7 with the shaped second fiber layer 9 is from Discharge area of the D part 19 into a merging section 10 with a lower vertex 11, in which the first and second fiber layers 5, 9 are brought together to produce a multilayer fibrous web 2, guided.
  • the buckling device 21 is preferred formed as a preferably driven kink roller 23, but it can in not shown, also as an articulated shoe, articulated beam or the like be executed. Furthermore, the direction of kinking of the two screens 7, 8 is at the Rolls 16, 23 and in the twin wire zone 6.1 in the same direction.
  • the two screens 7, 8 have a wrap angle ⁇ on the buckling device 21, which has a value in the range from 20 ° to 180 °, preferably from 30 ° up to 150 °.
  • the kinking device 21 is arranged in the loop of the top wire 7 and the outlet point 24 of the two screens 7, 8 from the forming roller 16 lies in Direction of travel L (arrow) of the belt 4 in front of the run-up point 25 of the two screens 7, 8 on the buckling device 21.
  • the buckling device 21 of FIG. 1 is preferably a solid roller with a smooth surface. However, it can also be a grooved and / or have drilled surface or it can even as a forming or suction roll be trained.
  • the first sieve (top sieve) 7 and the second fibrous web 9 are then guided into the merging section 10, in which the first and second fibrous layers 5, 9 are brought together to produce a multilayer fibrous web 2.
  • the first screen (top screen) 7 is then guided back to the screen guide roller 17 via a plurality of guide rollers 27.
  • the merging section 10 is formed by a preferably known and possibly driven rubber roller 28, which can be closed or open or open and vacuumed.
  • the merging section 10 can also be designed as a rubber press according to the applicant's unpublished German patent application DE 101 01 549.6 (PB11190 DE). The content of this patent application is hereby made the subject of the present description.
  • FIG. 1 there is a separating suction device in FIG. 1 after the merging cut 10 26 for the safe separation of the now multi-layer fibrous web 2 from the first Sieve (top sieve) 7 arranged in the loop of the belt 4.
  • the forming roller 16 has a diameter D greater than 1,200 mm, preferably greater than 1,635 mm, in particular greater than 1,760 mm, and is as a suction roll formed; however, it can also be designed as an open roller be, the open roller in turn by means of a grill or Honeycomb structure can be unlocked.
  • the forming roller 16 has a drainage capacity that one Value of at least 50%, preferably at least 65%, of the total drainage capacity of the twin wire former 6.
  • FIGS. 2 to 6 show one that is shown in FIG. 1 and is sufficient described sieve section 1 in slightly different configurations. Consequently with regard to their general descriptions, reference is made to that of FIG.
  • the drain point 24 of the two Sieves 7, 8 from the forming roller 16 before the point of impact 25 thereof or in Area of the run-up point 25 of the same on the buckling device 21 in the form of a Buckling roller 23 lies.
  • the two screens 7, 8 are separated from the kinking device as they run 21 due to different outlet angles for the screens 7, 8.
  • FIG. 3 shows the twin-wire section 6 of the wire section 1 according to the invention, the buckling device 21 being arranged in the form of a buckling roller 23 in the loop of the second wire (bottom wire) 8. After passing through the buckling device 21 through the two screens 7, 8 and the second fibrous layer 9 inserted between them, their separation takes place in a manner similar to the embodiment in FIG.
  • Such an arrangement of the buckling roller 23 ensures that the top wire 7 always travels a longer distance in the twin wire area compared to the bottom wire 8 due to the bottom wire thickness, suspension or fiber layer. As a result, acceleration and braking effects of the two screens 7, 8 are largely avoided.
  • the buckling device 21 in the form of a buckling roller 23 in the loop of the second Siebs (lower sieve) 8 arranged.
  • the two are separated Sieves 7, 8 through a preferably partially suctioned merging section 10.
  • This is preferably a rubber roller 28 with controllable vacuumed areas 29 formed.
  • FIG. 5 shows a further embodiment of the wire section 1 according to the invention.
  • the buckling device 21 in the form of a buckling roller 23 is again in the Loop of the second sieve (lower sieve) 8 arranged and the separation of the two sieves 7, 8 and the second fibrous layer 9 inserted between them is carried out by a vacuum cleaner 26 of known type, the second Fiber layer 9 remains on the first sieve (top sieve) 7.
  • the wire section 1 of the figure 5 is also characterized by the shape of its sieves 7, 8 comparatively low overall height.
  • the twin wire section 6 of the wire section 1 according to the invention can be advantageous Be placed on the belt 4 as a unit. This makes it suitable their use in particular in a screen section conversion.

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EP03102033A 2002-07-16 2003-07-08 Section de formage pour la production d'une bande fibreuse multicouche Ceased EP1382740A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002132125 DE10232125A1 (de) 2002-07-16 2002-07-16 Siebpartie zur Herstellung einer mehrlagigen Faserstoffbahn
DE10232125 2002-07-16

Publications (1)

Publication Number Publication Date
EP1382740A1 true EP1382740A1 (fr) 2004-01-21

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EP03102033A Ceased EP1382740A1 (fr) 2002-07-16 2003-07-08 Section de formage pour la production d'une bande fibreuse multicouche

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EP (1) EP1382740A1 (fr)
DE (1) DE10232125A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052263A1 (fr) * 2010-10-19 2012-04-26 Voith Patent Gmbh Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1096067A2 (fr) * 1999-10-21 2001-05-02 Voith Paper Patent GmbH Forme
WO2001044569A1 (fr) * 1999-12-15 2001-06-21 Metso Paper, Inc. Agencement et procede de formation d'une bande de papier ou de carton multicouches
EP1138822A2 (fr) * 2000-03-30 2001-10-04 Voith Paper Patent GmbH Dispositif pour la fabrication d' une bande fibreuse à plusieurs couches

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019593C2 (de) * 1990-06-20 1994-01-20 Voith Gmbh J M Stoffauflauf für Papiermaschinen
DE4402273C2 (de) * 1994-01-27 1995-11-23 Voith Gmbh J M Papiermaschine zur Herstellung mehrlagiger Papierbahnen
DE19651493A1 (de) * 1996-12-11 1998-06-18 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zum Formen einer mehrlagigen Faserstoffbahn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1096067A2 (fr) * 1999-10-21 2001-05-02 Voith Paper Patent GmbH Forme
WO2001044569A1 (fr) * 1999-12-15 2001-06-21 Metso Paper, Inc. Agencement et procede de formation d'une bande de papier ou de carton multicouches
EP1138822A2 (fr) * 2000-03-30 2001-10-04 Voith Paper Patent GmbH Dispositif pour la fabrication d' une bande fibreuse à plusieurs couches

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052263A1 (fr) * 2010-10-19 2012-04-26 Voith Patent Gmbh Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille
CN103270215A (zh) * 2010-10-19 2013-08-28 沃依特专利有限责任公司 用于制造材料幅的纸页成形单元以及纸页成形单元的运行方法
US8784614B2 (en) 2010-10-19 2014-07-22 Voith Patent Gmbh Sheet forming unit for producing a material web and method for operating the sheet forming unit
US9011642B2 (en) 2010-10-19 2015-04-21 Voith Patent Gmbh Sheet forming unit for producing a material web and method for operating the sheet forming unit
CN103270215B (zh) * 2010-10-19 2016-07-06 沃依特专利有限责任公司 用于制造材料幅的纸页成形单元以及纸页成形单元的运行方法

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Publication number Publication date
DE10232125A1 (de) 2004-02-05

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