EP1233105A2 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP1233105A2
EP1233105A2 EP02000847A EP02000847A EP1233105A2 EP 1233105 A2 EP1233105 A2 EP 1233105A2 EP 02000847 A EP02000847 A EP 02000847A EP 02000847 A EP02000847 A EP 02000847A EP 1233105 A2 EP1233105 A2 EP 1233105A2
Authority
EP
European Patent Office
Prior art keywords
wire
twin
forming
former
wire former
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
EP02000847A
Other languages
German (de)
English (en)
Other versions
EP1233105A3 (fr
Inventor
Joachim Dr. Grabscheid
Volker Schmidt-Rohr
Johann Moser
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 EP1233105A2 publication Critical patent/EP1233105A2/fr
Publication of EP1233105A3 publication Critical patent/EP1233105A3/fr
Ceased legal-status Critical Current

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Classifications

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

Definitions

  • the invention relates to a twin wire former for producing a fibrous web, in particular a paper, cardboard or tissue web, from a fiber suspension according to the features of the preamble of claim 1.
  • This type of a twin wire former is commonly referred to as a "roll blade former" designated.
  • twin wire former for producing a paper web, in particular made of fine paper
  • PCT publication WO 97/47803 The disclosed twin wire former has a same upstream headbox with several separating elements in its headbox nozzle and one preferably vacuumed forming roller with a forming roller diameter of ⁇ 1.4 m and a forming roll wrap angle of ⁇ 25 °. Furthermore, in one downstream of the forming roll and curved twin-wire zone medium for introducing pulsating pressure effects into the resulting paper web appropriate.
  • twin wire former for the production of a paper web, in particular from SC paper, known.
  • a fiber suspension is on a first dewatering in a forming area and then on guided a curved formation shoe with a radius of 2 m to 8 m and further drained. Then at least one drainage unit is included Drainage attached.
  • the end area of the twin wire zone has one second forming roller with at least one suction zone, in the area of which The top wire of the twin wire former is separated from the resulting paper web and is guided away by means of a guide roller.
  • twin-wire formers have in common that the proportion of dewatering on the forming roller or in the area of the forming area is greater than 70%. Since, moreover, considerable parts of the paper webs are formed without the presence of pressure pulsations, an only average formation quality is unavoidable in the case of pulp suspensions which are difficult to form.
  • Another disadvantage is that both twin wire formers have a very long free jet path (distance from the headbox nozzle to the jet impact point), for example of more than 400 mm, which has a negative effect on the web quality, both in the machine direction (MD direction) and in the cross machine direction (CD direction) ), affects. Particular attention must be paid to a certain groin drainage for the optimal leaf quality.
  • the optimal formation roller wrap must first be determined by costly and time-consuming pilot tests. Since the forming roll wrap angle must always be matched to the type of paper, web weight and machine speed, even a small change in one parameter leads to greater effects, which then have to be neutralized in a complex manner. If the sheet formation system has to cover a larger weight range (specific production quantity P), which is always the case with production systems, the working point leaves the optimum working range when changing the grade. In the twin-wire formers mentioned above, the throughput of fiber suspension through the headbox must then be increased disadvantageously in order to get back into the optimal working window.
  • the initial dewatering (dwell time) on the forming roller or by dewatering quantity is reduced to a minimum, the minimum being less than 30% based on the throughput of a material density between 0.4% and in the area of the wedge-shaped inlet gap 2.0%, preferably between 0.6% and 1.5%, having fibrous suspension through the headbox.
  • This is achieved through the maximum forming roller diameter of 1,400 mm and the maximum forming roller wrap angle of 7 °.
  • the maximum forming roller diameter of 1,400 mm and the maximum forming roller diameter of 7 ° mean that the dwell time on the forming roller is greatly reduced.
  • the minimal initial dewatering on the forming roller ensures uncritical positioning of the headbox jet (jet shot).
  • the headbox in the headbox nozzle of which at least one machine-wide separating element, in particular a lamella, is attached, generates a high-quality headbox jet, which in turn enables the use of particularly difficult-to-form fiber suspensions with a high long-fiber content, for example papers, in the twin-wire former according to the invention , even optimally favored.
  • the surface of the forming drum with open volume is grooved and / or drilled and / or lowered or built up from a honeycomb structure.
  • At least one further forming suction device is connected downstream of the forming suction device, as seen in the direction of travel of the wire.
  • the forming suction devices are attached to one another, wherein the forming suction devices — viewed in the direction of wire travel — can be spaced apart from one another.
  • a forming suction device has a curved suction surface with a radius of curvature from 1,500 mm to 10,000 mm, in particular from 2,000 mm to 5,000 mm.
  • the at least one forming suction device has at least one suction chamber, their negative pressure preferably by means of a controllable negative pressure source is controllable. This will set the optimal operating conditions made possible in the area of the forming suction device, or even significantly promoted.
  • a plurality of forming strips attached to the at least one forming suction device At least one of the forming strips is resiliently supported and / or at least one of the forming strips is firmly supported, wherein whose basic position is adjustable relative to their sieve belt, for example by moving or pivoting.
  • At least one forming suction device is seen in the direction of wire travel - connected at least one wet vacuum cleaner.
  • the wet vacuum is preferred applied with negative pressure, the negative pressure by means of a controllable Vacuum source is controllable / adjustable. So that is the setting Optimal operating conditions in the area of the wet vacuum enables, even significantly promoted.
  • about the spatial dimensions of the twin wire former according to the invention is to keep the separating element as low as possible - seen in the direction of wire travel - Upstream of a deflection roller, the actual horizontal and / or vertical Length of the twin wire zone reduced to a certain extent.
  • the twin wire zone of the twin wire former according to the invention can be in the wire running direction in the first embodiment essentially vertically from the bottom up, preferably with a vertical deflection to the vertical from -15 ° to + 15 °, in particular from -5 ° to + 5 °, and in the second version from bottom to top with an incline from the horizontal of approximately 5 ° to 45 °.
  • the twin-wire zone can also be designed for inclined inclinations in the end area fall from top to bottom.
  • FIG. 1 shows a first embodiment of the twin wire former 1 according to the invention in a schematic side view.
  • Two endless sieve belts (lower sieve 2 and upper sieve 3) together form a twin-wire zone 5.
  • the twin-wire zone 5 in which the two wire belts 2, 3 run over a dewatering element in the form of a rotating forming roller 6, the two wire belts 2, 3 form the forming roller 6 together a wedge-shaped inlet gap 7 ("gap former") which receives the fibrous suspension 9 directly from a headbox 8 arranged obliquely to the left and only partially shown.
  • the rotating forming roller 6 has an open volume (storage volume) and is not vacuumed. Furthermore, the rotating forming roller 6 according to the invention has a forming roller diameter D F less than 1,400 mm and has a forming roller wrap angle ⁇ less than 7 °.
  • the rotating forming roller 6 - as seen in the direction of wire travel S - is immediately followed by a forming suction 15.1, preferably on the side of the forming roller.
  • the fibrous stock suspension 9 in the area of the wedge-shaped inlet gap 7 also has a stock density between 0.4% and 2.0%, preferably between 0.6% and 1.5%.
  • the open volume of the forming roller 6 is such that its surface is grooved and / or drilled and / or lowered or is constructed from a honeycomb structure. Since these shapes belong to the prior art and are therefore known to the person skilled in the art, their detailed representation is not shown.
  • the first forming suction device 15.1 is also - seen in the direction of wire travel S - a further forming suction device 15.2 downstream, the forming suction devices 15.1, 15.2 being attached to one another and at a distance from one another.
  • the forming suction devices 15.1, 15.2 have a curved suction surface 16 with a radius of curvature R K (arrow) from 1,500 mm to 10,000 mm, in particular from 2,000 mm to 5,000 mm.
  • the first forming suction device 15.1 has at least one suction chamber 17.1, the second forming suction device 15.2 has two suction chambers 17.21, 17.22, the negative pressures of which can be controlled / regulated by means of a controllable negative pressure source 18.1, 18.2. Furthermore, according to the invention, a large number of forming strips 19 are attached to the first suction chamber 17.21 of the second forming suction device 15.2. At least one of the forming strips 19 is resiliently supported or at least one of the forming strips 19 is firmly supported, its position being adjustable relative to the upper sieve 3, for example by moving or pivoting.
  • the headbox 8 has a headbox nozzle 13, in which at least one machine-wide separating element 14, in particular a lamella, is attached, two separating elements 14 being shown in FIG.
  • This separating element 14 can be sectioned across the machine width and its effective length within the headbox nozzle 13 can be designed to be displaceable by means of a mechanism including a control unit.
  • the use of at least one separating element 14 is particularly recommended when using wood-free fiber suspension.
  • the twin wire zone 5 of the twin wire former 1 according to the invention rises in the wire running direction S essentially vertically from bottom to top, the vertical deflection A V to the vertical V having a value from -15 ° to + 15 °, in particular from -5 ° to + 5 °, accepts.
  • FIG. 2 shows a second embodiment of the twin wire former 1 according to the invention, which is fundamentally similar to the first embodiment.
  • FIG. 2 is thus referred to or referred to.
  • the forming suction device 15.1 acting on the lower wire 2 - downstream in the wire running direction S - is followed by a wet suction device 20 acting on the upper wire 3.
  • the forming suction device 15.1 has three suction chambers 15.11, 15.12, 15.13, the negative pressure being controllable / regulatable by means of a controllable negative pressure source 18.3.
  • the wet vacuum cleaner 20, on the other hand has only one suction chamber 20.1 which is subjected to negative pressure, the negative pressure being controllable / regulatable by means of a controllable negative pressure source 18.4.
  • a plurality of forming strips 19 are attached to the three suction chambers 15.11, 15.12, 15.13 of the forming suction device 15.1.
  • the headbox 8 shown only partially in FIG. 2 does not have a machine-wide separating element, in particular a lamella.
  • Figures 3 and 4 show a third and fourth embodiment of the invention Twin wire former 1 in a schematic side view. Because the respective basic structure again similar to the embodiment of Figure 1 is referred to or referred to the same.
  • twin-wire zone 5 rises in the wire running direction S from bottom to top with an inclination N with respect to the horizontal H of approximately 5 ° to 45 °
  • the headbox 8 which is only partially shown in FIG in Figure 4 is arranged obliquely to the top right.
  • twin-wire formers 1 of both figures each have two forming suction pads 15.1, 15.2, which are immediately downstream, as seen in the direction of wire travel S: in FIG. 3, first a forming suction piece 15.1 arranged on the lower wire 2 and then one on the upper wire 3, with opposing forming strips 19 Forming suction device 15.2 provided, in FIG.
  • the second forming suction device 15.2 - seen in the direction of wire travel S - is followed by a deflecting roller 21 which causes the twin wire zone 5 to drop from top to bottom in the end region.
  • the deflection roller 21 is followed by a separating element 11 in the form of a separating suction device 22, which separates the top wire 3 from the formed fibrous web 4 and the bottom wire 2.
  • the separating suction device 22 is followed by a flat suction device 23 and a sieve suction roller 12, the fibrous web 4 being removed from the lower wire 2 by a felt 24 on a subsequent pickup roller 25 and being fed to the further manufacturing process.
  • the second forming suction device 15.2 - seen in the wire running direction S - is followed by a separating element 11 in the form of a wire suction roll 12, which separates the top wire 3 from the fibrous web 4 formed and the bottom wire 2.
  • the respective means for generating the negative pressures are not shown in FIGS. 3 and 4.
  • FIG. 5 shows a diagram of the operating behavior for fiber suspensions in a conventional roll blade former concept.
  • the throughput D S of fiber suspension through the headbox is given in [I / (min ⁇ m)] on the abscissa, and the forming shoe drainage E F in [I / (min ⁇ m)] is given on the ordinate.
  • the throughput D S assumes a value range from 8,500 [I / (min ⁇ m)] (left boundary line) to 18,380 [I / (min ⁇ m)] (right boundary line), whereas the forming shoe drainage E F has a value range of 600 [I / (min ⁇ m)] (lower limit line) to 2,000 [I / (min ⁇ m)] (upper limit line).
  • the boundary line results in a working window in which the roll blade former can be operated along a curve K (bold print) with good results in a larger weight range (specific production quantity P).
  • FIG. 6 shows the optimal working window AF opt of FIG. 5 in enlarged form, the working point AP being in the optimal working window AF opt .
  • the working point AP now leaves the optimal working window AF opt (vertical arrow pointing downwards) and thereafter lies only on the curve K '(dashed line) of the working window AF with poorer results.
  • the Throughput D S of fiber suspension through the headbox must be increased (arrow diagonally to the top right) in order to get back into the optimal working window.
  • the invention is a twin wire former of the type mentioned above is created, the aforementioned Disadvantages of the prior art completely avoided and particularly heavy Fiber suspensions to be formed with a high long fiber content, for example Papers, can be used optimally.

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  • Paper (AREA)
EP02000847A 2001-02-14 2002-01-15 Section de formage à deux toiles Ceased EP1233105A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10106731A DE10106731A1 (de) 2001-02-14 2001-02-14 Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
DE10106731 2001-02-14

Publications (2)

Publication Number Publication Date
EP1233105A2 true EP1233105A2 (fr) 2002-08-21
EP1233105A3 EP1233105A3 (fr) 2003-12-03

Family

ID=7673947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02000847A Ceased EP1233105A3 (fr) 2001-02-14 2002-01-15 Section de formage à deux toiles

Country Status (3)

Country Link
US (1) US6776877B2 (fr)
EP (1) EP1233105A3 (fr)
DE (1) DE10106731A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055834A1 (de) 2007-12-17 2009-06-18 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
EP1975314A3 (fr) * 2007-03-31 2010-09-29 Voith Patent GmbH Machine destinée à la fabrication d'une bande de tissu, en particulier d'une machine à fabriquer du papier tissu
DE202010016217U1 (de) 2010-12-04 2011-02-17 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffbahn
WO2012045488A1 (fr) 2010-10-07 2012-04-12 Voith Patent Gmbh Système de formation de feuilles pour une machine de production d'une bande de matière fibreuse au moins monocouche
US9637314B2 (en) 2010-11-08 2017-05-02 Krones Aktiengesellschaft Machine for processing and/or packaging objects and method for modifying a conveying section of this machine

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
DE10161056A1 (de) * 2001-12-12 2003-06-26 Voith Paper Patent Gmbh Siebpartie
WO2004018768A1 (fr) * 2002-08-23 2004-03-04 Metso Paper, Inc. Formation de nappe de papier ou de carton dans un formeur double toile ou dans une partie double toile d'un formeur
AT412098B (de) * 2002-11-11 2004-09-27 Andritz Ag Maschf Vorrichtung zur trennung einer papierbahn von einem sieb
DE10327425A1 (de) * 2003-06-18 2005-01-05 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn
MXPA06005684A (es) * 2003-12-22 2006-08-17 Astenjohnson Inc Seccion de formacion tipo separacion para una maquina de fabricacion de papel tela doble.
DE102004050263A1 (de) 2004-10-14 2006-04-27 Voith Paper Patent Gmbh Walze zur Herstellung und/oder Behandlung einer Faserstoffbahn, Verfahren zur Herstellung der Walze und Anwendung der Walze
DE102005003531A1 (de) * 2005-01-25 2006-08-03 Voith Paper Patent Gmbh Doppelsiebformer und Verfahren zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension
DE102005000014A1 (de) * 2005-02-24 2006-08-31 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension
FI20065446L (fi) * 2006-06-28 2007-12-29 Metso Paper Inc Muodostusosa
DE102007006959A1 (de) 2007-02-13 2008-08-14 Voith Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn
DE102008040688A1 (de) * 2008-07-24 2010-01-28 Voith Patent Gmbh Verfahren zur Optimierung der Energiebilanz in Formiereinheiten in Maschinen zur Herstellung von Faserstoffbahnen und Formiereinheit
WO2013016515A1 (fr) 2011-07-27 2013-01-31 Hollingsworth & Vose Company Systèmes et procédés pour réaliser des bandes fibreuses

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US4141788A (en) * 1978-05-02 1979-02-27 Beloit Corporation Method of and means for forming multi-ply paper webs from a single headbox
DE3473312D1 (en) * 1984-09-29 1988-09-15 Finckh Maschf Roll for machines for the paper industry or the like
US5225043A (en) * 1989-04-04 1993-07-06 Sulzer-Escher Wyss Gmbh Twin wire former with water guide element over the forming zone
DE3910892A1 (de) * 1989-04-04 1990-10-11 Escher Wyss Gmbh Doppelsiebformer
US5389206A (en) * 1989-08-22 1995-02-14 J. M. Voith Gmbh Twin wire former
DE4019884A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Leiste zur nachgiebigen stuetzung eines siebbandes
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US5129988A (en) * 1991-06-21 1992-07-14 Kimberly-Clark Corporation Extended flexible headbox slice with parallel flexible lip extensions and extended internal dividers
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US5798024A (en) * 1996-06-11 1998-08-25 Valmet Corporation Controlling web anistropy in a roll and blade twin-wire gap former

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1975314A3 (fr) * 2007-03-31 2010-09-29 Voith Patent GmbH Machine destinée à la fabrication d'une bande de tissu, en particulier d'une machine à fabriquer du papier tissu
DE102007055834A1 (de) 2007-12-17 2009-06-18 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension
EP2072677A1 (fr) 2007-12-17 2009-06-24 Voith Patent GmbH Partie humide à deux toiles pour une machine destinée à la fabrication d'une bande de matière fibreuse à partir d'au moins une suspension de matière fibreuse
WO2012045488A1 (fr) 2010-10-07 2012-04-12 Voith Patent Gmbh Système de formation de feuilles pour une machine de production d'une bande de matière fibreuse au moins monocouche
DE102010042106A1 (de) 2010-10-07 2012-04-12 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn
US9637314B2 (en) 2010-11-08 2017-05-02 Krones Aktiengesellschaft Machine for processing and/or packaging objects and method for modifying a conveying section of this machine
DE202010016217U1 (de) 2010-12-04 2011-02-17 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffbahn

Also Published As

Publication number Publication date
US6776877B2 (en) 2004-08-17
DE10106731A1 (de) 2002-08-22
EP1233105A3 (fr) 2003-12-03
US20020108732A1 (en) 2002-08-15

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