EP0967323A2 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP0967323A2
EP0967323A2 EP99101848A EP99101848A EP0967323A2 EP 0967323 A2 EP0967323 A2 EP 0967323A2 EP 99101848 A EP99101848 A EP 99101848A EP 99101848 A EP99101848 A EP 99101848A EP 0967323 A2 EP0967323 A2 EP 0967323A2
Authority
EP
European Patent Office
Prior art keywords
wire
twin
sieve
belt
forming roller
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
EP99101848A
Other languages
German (de)
English (en)
Other versions
EP0967323A3 (fr
EP0967323B1 (fr
Inventor
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 Sulzer Papiertechnik 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 Sulzer Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiertechnik Patent GmbH
Publication of EP0967323A2 publication Critical patent/EP0967323A2/fr
Publication of EP0967323A3 publication Critical patent/EP0967323A3/fr
Application granted granted Critical
Publication of EP0967323B1 publication Critical patent/EP0967323B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 forming a fibrous web, for. B. Paper web, from a fiber suspension, in particular as part of a paper manufacturing machine.
  • a twin wire former has two endless, rotating wire belts which together form a twin wire zone. In the area of this twin wire zone, the fibrous web is formed between the two wire belts.
  • the two wire belts run together over a forming roller, one wire belt, namely the “inner” wire belt, coming into direct contact with the forming roller.
  • the other wire belt comes into contact with the "outer" wire belt, in contact with at least one support device extending across the wire belt, here with a bar.
  • this bar can be rigidly fixed in the machine frame. However, it can preferably be resiliently pressed onto the outer sieve belt (for example by means of a pneumatic hose). In all cases, a temporary divergence of the two sieve belts (sieve separation) should be prevented by means of the bar at the drain point mentioned. Such a divergence of the two sieve belts can occasionally be observed, although the sieve belts are stretched in the running direction. The result is that proper formation of the fibrous web is disturbed.
  • the resilient pressing of the bar gives the advantage that the position of the bar automatically adapts to the instantaneous layer thickness of the fiber suspension located between the two sieve belts. In a similar form, this is also disclosed in WO 95/34713 (FR 20365). However, the prior art arrangements described above have not yet been shown to be sufficiently effective. Occasionally, disturbances of an orderly path formation are still observed.
  • the invention is therefore based on the object of a twin wire former described design to improve that the disturbances mentioned be avoided in the quality of the finished paper.
  • This object is essentially according to the characterizing part of claim 1 solved in that in the area of the discharge point of the fabric belts from the forming roller a vacuum zone is formed on the side of the outer screen belt, e.g. using a so-called foil bar.
  • the effect of the inventive design of the negative pressure zone is based on the fact that a similar negative pressure develops in the gusset, which always is present between the running inner screen belt and the jacket of the Forming roller.
  • the sliding surface of the foil strip touching the outer screen belt as known per se, resiliently pressed onto the outer screen belt.
  • the foil strip (seen in a cross section through the foil strip) in its downstream Area by means of a joint on a fixed or on an adjustable Support component and in its upstream area by means of a flexible Press the adjusting device (e.g. pneumatic hose) onto the outer sieve.
  • a breast roll 13 and a forming roll can be seen in a twin wire former in FIG 14 and two screen belts 11 and 12, which - starting at the forming roller 14 - form a twin-wire zone with each other.
  • the one screen belt 12 is the so-called inner screen belt, which is in direct contact comes with the forming roller 14.
  • the other sieve belt 11 is the so-called outer one Screen belt; it comes into direct contact with the breast roller 13 and runs from it to the forming roller 14.
  • a headbox 10 guides a fiber suspension jet into the (from the two sieve belts 11 and 12) formed gusset. Loop around the two sieve belts 11 and 12 now together a relatively small area of the jacket of the forming roller 14; A suction zone 14a can be located in this area.
  • a support device 9 which is shown in FIG. 1 as a so-called Foil bar is formed.
  • This has an outer screen belt 12 touching Sliding surface 9a and a foil surface 9b adjoining it in the direction of wire travel. The the latter diverges from the outside at a small angle of, for example, 1 to 5 ° Sieve belt 12. This results from the movement of the sieve belts between the Foil area 9b and the outer screen belt 11 a negative pressure zone.
  • the foil bar 9 is part of a drainage box 8, for example Guide the sieve belts has further strips 8a.
  • a bearing block 7a To support the foil bar on the drainage box 8, a bearing block 7a, the downstream Supported area of the foil strip 9 by means of a joint 7.
  • the upstream area the foil strip 9 with the sliding surface 9a is by means of a pneumatic hose 6 (with finely adjustable power) resiliently pressed onto the outer sieve belt 11.
  • the sliding surface 9a of the foil bar 9 is in the immediate vicinity of the drain point of the two screen belts 11 and 12 from the forming roller 14.
  • the outer screen belt 11 Contacting sliding surface 9a by a small amount x downstream from (ie behind) the Arrange drain point A.
  • An arrangement of the sliding surface 9a before the drain point A is also possible.
  • FIG. 3 is at the outlet of the two wire belts 11 and 12 from the forming roller 14 a suction zone is formed by means of a suction shoe 9 ', which in turn is on a joint 7 rests and with the help of a pneumatic hose 6 to the outer sieve belt 11 is resiliently pressable.
  • the interior of the suction shoe open to the filter belt 11 9 ' is connected to a vacuum source 29.
  • Figure 4 shows a schematic Side view of a complete twin wire former, again with a headbox 10, two endless sieve belts 11 and 12, breast roll 13 and forming roll 14, from the two sieve belts to a small sector a (with an angle between 10 and 40 °) is entwined.
  • the two fabric belts run from the forming roller 14 (together with the fibrous web that forms in between) via a first Suction roller 18 and then a second suction roller 19.
  • the inner part separates Screen belt 12 from the fibrous web and runs back over guide rolls 22 to the forming roll 14.
  • the outer screen belt 11 continues the fibrous web until the fibrous web removed from the screen belt by means of a take-off felt 23 and a take-off roller 24 becomes.
  • the outer screen belt 11 runs back over guide rollers 21 to the breast roller 13.
  • Foilark 9 arranged, also two compliant to the Umschlingunszone the forming roller 14 pressable formation bars 15.
  • the arrangement is made such that the outer sieve belt 11 is a lower sieve and that the inner sieve belt 12th is a top sieve.
  • the foil bar 9 is from bottom to top in the direction of the forming roller 14 pressed against the lower sieve 11.
  • the two sieve belts run from the forming roller 14, obliquely upwards.
  • the outer screen belt 11 comes with a Foil strip 9 in contact, which (as described above) with the outer sieve belt 11 Vacuum zone forms.
  • the outer sieve belt 11 is a top sieve and the inner sieve belt 12 a lower sieve, so that the foil strip 9 from the top down to the upper sieve 11 is pressed.
  • the foil strip 9 is in turn fixed by means of a joint 7 Component supported, which in the present case as an upper drainage box 38 is formed. This is weakly bulged downwards (with a large radius of curvature R).
  • Located on the bottom of the drainage box 38 a series of strips 28 which are fixedly connected to the box 38 and over which the outer screen belt 11 slides.
  • vacuum chambers 32 are formed in the box.
  • Within the loop of the inner screen belt 12 is a lower drainage box 37 provided.
  • FIG. 6 shows a more compact design compared to FIG. 5, in which the separating suction device 33 does not apply.
  • the drain box 38 ' has an additional vacuum chamber 32 '; the screen suction roller 30 is arranged immediately behind this.
  • the twin wire former shown in FIG. 7 again comprises two wire belts 11 and 12.
  • the inner sieve belt 12 forms a lower sieve and the outer sieve belt 11 is a top sieve.
  • the top wire 11 on the circumference of the forming roller 14 comes into contact with the lower sieve 12, it runs over a breast roller 13.
  • the two screen belts 11 and 12 form together a wedge-shaped inlet gap, which is directly from a headbox 10 Fibrous suspension absorbs.
  • the headbox is only indicated schematically. It is preferably a Headbox in a known manner with a sectionally controllable dilution water addition is equipped for the purpose of setting a desired basis weight cross section the finished paper web.
  • the twin-wire former has within the loop of the upper wire 11 in the area of Forming roller 14, a water collecting device 36. It first arrives there large part of the suspension water, which at the beginning of the twin sieve zone Upper sieve 11 penetrates. This is done essentially in the upper descending quadrant the forming roll 14. Approximately at the level of the forming roll axis of rotation the two sieves 11 and 12 run with the fibrous web formed between them down from the forming roller. They then run over one in the loop of the Upper sieve 12 arranged, and formed from last 8a convex curved forming shoe. Further suspension water penetrates into the collecting trough between the strips 8a 36. Another part of the suspension water flows through the lower sieve 11 in a drip pan 40.
  • molding strips can be provided, which are known in the art Can be pressed resiliently onto the lower sieve 12 (not shown in FIG. 7).
  • the bottom wire 12 can be in the area of the strips 8a at least one deflector can be assigned.
  • the jacket of the forming roller 14 has recesses for temporary use in a known manner Storing water, e.g. in the form of a honeycomb cover and one on it attached sieve stocking.
  • the forming roller 14 can be designed as a suction roller, with vacuum source 29. Also arranged in the loop of the top wire 11 Water collection device 36 can be connected to a vacuum source 29 'if necessary be. According to the invention at the outlet of the sieve belts 11, 12 of the forming roll 14 arranged a vacuum bar 9, with the help of of the features described in FIG. 1.
  • the twin-wire zone forms one with an imaginary vertical plane Angle a, which is between 10 and 50 degrees, in this section the top sieve 11 is always located above the lower wire 12.
  • the angle a is preferably less than 45 degrees.
  • further drainage elements can be provided, e.g. the lower sieve 12 touching suction boxes 47.
  • Deflection roller 42 is provided, which essentially transforms the two screen belts 11, 12 into one redirects horizontal running direction.
  • Separating suction device 33 is provided, on which the upper sieve 11 is separated from the lower sieve 12 and the paper web on it lifts off.
  • the top wire 11 runs from here over guide rollers 46 back to the breast roll 13.
  • the bottom wire 12 runs after the separating suction device 33 - If necessary via at least one further suction box 37 '- to a screen suction roll 30, then via guide rollers 41 back to the forming roller 14.
  • the paper web formed in a known manner by means of a Felt 23 and a take-off roller 24 removed from the lower wire 11.
  • the foam strip 9 (or suction shoe 9 ') according to the invention in connection with steep sieve belts running below (similar to FIG. 7) can also be used in a twin-wire former according to patent application 19651493.2 (PA 10449); this is for education a multilayer paper web arranged on a fourdrinier wire.

Landscapes

  • Paper (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
EP99101848A 1998-06-25 1999-01-28 Section de formage à deux toiles Expired - Lifetime EP0967323B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19828237A DE19828237A1 (de) 1998-06-25 1998-06-25 Doppelsiebformer
DE19828237 1998-06-25

Publications (3)

Publication Number Publication Date
EP0967323A2 true EP0967323A2 (fr) 1999-12-29
EP0967323A3 EP0967323A3 (fr) 2000-01-05
EP0967323B1 EP0967323B1 (fr) 2003-01-02

Family

ID=7871926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101848A Expired - Lifetime EP0967323B1 (fr) 1998-06-25 1999-01-28 Section de formage à deux toiles

Country Status (4)

Country Link
US (1) US6254727B1 (fr)
EP (1) EP0967323B1 (fr)
AT (1) ATE230454T1 (fr)
DE (2) DE19828237A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343914A1 (de) * 2003-09-19 2005-05-04 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
DE102004000068A1 (de) * 2004-12-30 2006-07-13 Voith Paper Patent Gmbh Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn
US7560762B2 (en) * 2005-08-23 2009-07-14 Macronix International Co., Ltd. Asymmetric floating gate NAND flash memory
FI20065142L (fi) * 2006-02-28 2007-08-29 Metso Paper Inc Imulaatikon etäisyyden säätö vastatelasta
FI120796B (fi) * 2006-03-31 2010-03-15 Metso Paper Inc Imulaatikon etäisyyden säätö vastatelasta
JP7361019B2 (ja) * 2017-09-01 2023-10-13 ストラ エンソ オーワイジェイ 板紙の製造方法、板紙、および段ボール

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH601556A5 (fr) * 1975-10-03 1978-07-14 Escher Wyss Gmbh
DE3815316C2 (de) * 1988-05-05 1996-02-01 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung an einem Doppelsieb-Former
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE9105328U1 (de) 1991-04-30 1991-07-04 J.M. Voith Gmbh, 7920 Heidenheim Stationäre Stützvorrichtung
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
US5573643A (en) 1992-01-17 1996-11-12 Valmet Corporation Twin wire web former in a paper machine
DE4328024A1 (de) * 1993-08-20 1995-02-23 Voith Gmbh J M Doppelsieb-Blattbildner
FI112509B (fi) * 1994-06-15 2003-12-15 Metso Paper Inc Paperikoneen kitaformeri
DE19652485A1 (de) * 1996-12-17 1998-06-18 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie

Also Published As

Publication number Publication date
DE19828237A1 (de) 1999-12-30
EP0967323A3 (fr) 2000-01-05
US6254727B1 (en) 2001-07-03
EP0967323B1 (fr) 2003-01-02
ATE230454T1 (de) 2003-01-15
DE59903896D1 (de) 2003-02-06

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