EP0940500B1 - Doppelsiebformer - Google Patents

Doppelsiebformer Download PDF

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Publication number
EP0940500B1
EP0940500B1 EP99101196A EP99101196A EP0940500B1 EP 0940500 B1 EP0940500 B1 EP 0940500B1 EP 99101196 A EP99101196 A EP 99101196A EP 99101196 A EP99101196 A EP 99101196A EP 0940500 B1 EP0940500 B1 EP 0940500B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
pivot axis
zone
assembly
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.)
Expired - Lifetime
Application number
EP99101196A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0940500A3 (de
EP0940500A2 (de
Inventor
Günter HALMSCHLAGER
Franz Stelzhammer
Alexander Wassermann
Jürgen BANNING
Werner Leitenberger
Thomas Elenz
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 EP0940500A2 publication Critical patent/EP0940500A2/de
Publication of EP0940500A3 publication Critical patent/EP0940500A3/de
Application granted granted Critical
Publication of EP0940500B1 publication Critical patent/EP0940500B1/de
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, in particular Paper web, from a fiber suspension, and usually (but not necessary) for further dewatering of the fibrous web.
  • the invention is based on a Twin-wire former with the features specified in the preamble of claim 1.
  • a twin-wire former according to the preamble of claim 1 is known from US patent 4,724,047.
  • the Doppeisiebformer shown for forming a fibrous web, eg paper web, from a fiber suspension comprises two endless screen belts, which together form a twin-wire zone.
  • the upper wire runs over at least two, preferably three rollers, namely via an inlet roller which guides the upper wire to the double-wire zone, the wires forming a wedge-shaped inlet zone with a wedge angle, and an outlet roller which returns the upper wire in the region of the end of the twin wire zone leads in the direction of the inlet roller.
  • An upper sieve assembly comprises, in addition to the rollers mentioned, a dewatering box which receives suspension water which flows upwards through the upper sieve.
  • the upper sieve assembly has for the dewatering box and for the infeed roller a common support means which is pivotable by means of a lifting device about a horizontal axis (operating pivot axis) such that the wedge angle is variable during the forming operation.
  • the lifting device which acts on the carrying device, is the only lifting device in order to both vary said wedge angle and lift the upper sieve assembly from the lower sieve.
  • the invention generally, but not exclusively, relates to a so-called hybrid former, in which the fiber suspension initially flows on the lower wire.
  • On the Under sieve begins the formation of traction by dehydration through the lower sieve downward.
  • the twin-wire zone the upper sieve in contact with the remaining fiber suspension, so that now the further train formation by dehydration through the upper sieve upwards, usually accompanied by further dehydration down.
  • the railway formation comes in the area the twin-wire zone at the end; i.e. there are no free-floating fibers anymore available.
  • Most of the time, there is another drainage from here in the twin-wire zone The formed fibrous web instead to their dry content as far as possible to increase.
  • the possibilities must be present during operation, if necessary, the so-called entry wedge angle (i.e., the angle of the wedge-shaped Inlet zone) to vary, mainly to the twin-wire former to different To be able to adapt layer thicknesses of the arriving fiber suspension.
  • entry wedge angle i.e., the angle of the wedge-shaped Inlet zone
  • the Obersiebbauner by means of a lifting device to a to swing so-called operating pivot axis.
  • At least one additional elaborate lifting device is provided to To be able to adjust the position of the operating swivel axle vertically. This serves too the purpose of lifting the upper sieve assembly from the lower sieve, for example around the Changing the strainers to facilitate or / or - at an unwanted standstill one of the two screens - to avoid damage to the screens.
  • Figure 2 of D3 is the Operating swivel axis in the area of the place where the sieves from (in the loop of the Drainage box drain).
  • This arrangement is also provided in the twin-wire former according to the invention; she is cheap because at one Changing the inlet wedge angle of the drainage box (touching the top wire) no appreciable horizontal movement relative to those in the lower wire loop run arranged drainage elements. Such a relative movement would disturb the proper formation of the fibrous web. Also becomes a significant vertical movement of the drain end of the dewatering box avoided; such a vertical movement would be the proper one Disturb the run of the two sieves to the following screening separator.
  • the main idea of the invention is, in addition to the horizontal Axis, which lies in the area where the sieves drain from the drainage box, in the area of the outlet roller a second, also horizontal and in the area of Outlet roller arranged Provide swivel axis.
  • second pivot axis is the Obersiebbauner by means of the single, preferably pivoted in the region of the inlet roller lifting device pivoted upward when a lifting of the upper sieve assembly from the lower sieve is required, so that a gap arises between the two seven.
  • this second pivot axis is only then effective after the maximum possible increase in the inlet wedge angle took place Has.
  • the support device lifts when lifting the upper sieve assembly from Under sieve off the bearing of the operating swivel axle and it is during the Shaper operation lifted from the camp of the additional pivot axis.
  • Figures 1A, 1B and 1C show a first embodiment with different Positions of the upper sieve assembly.
  • FIGS. 2A, 2B and 2C each show a further embodiment, again with different positions of the upper sieve assembly.
  • FIGS. 3 and 4 each show a further possible modification of the invention Twin wire.
  • the upper sieve assembly includes a drainage box 19, which has on its underside a plurality of strips 21 which touch the upper sieve, in that part of the twin-wire zone in which the forming strips 14 (by means of pneumatic pressure elements) yieldingly pressed against the bottom wire become.
  • the formed by the strips 21 bottom of the watering box 19 may be flat or slightly convexly curved or, for example, one inflow-side planar region and a drain-side convexly curved region exhibit.
  • Each of the forming strips 14 is preferably opposite to one Gap between two of the strips 21 of the dewatering box 19.
  • Carrying device 22 is provided, for example one of two longitudinal members and cross struts composite frames. In place of cross struts can also only the drainage box 19 for cross-connection between the side rails serve.
  • the support means 22 (and thus the entire top wire assembly 20) is on a machine frame 9 supported, in the region of the inlet roller 16 by means a lifting device 23 and in the region of the point where the sieves 11, 12 from the drainage box 19 expire, by means of a hinge 24, which is the so-called operating pivot axis forms. This extends horizontally transversely to the web running direction.
  • an additional pivot axis 25 is provided below the outlet roller 17, the also extends horizontally across the machine.
  • the upper wire assembly 20 is in positions which it can take during normal Former operation.
  • the Entry wedge angle k relatively small.
  • the lifting device 23 has the upper sieve assembly lifted over the figure 1A by a small amount, so that the Wedge angle k is greater than in Figure 1A.
  • the twin-wire former is adapted, for example to an increased layer thickness of arriving on the lower wire 11 Suspension.
  • Such a change in the position of the upper sieve assembly may also be too serve the purpose of the point S, where the top wire 12 in contact with the suspension comes to move a little in web direction.
  • the carrying device is divided into an inlet section 22a and an outlet section 22b.
  • the inlet section 22a is pivotable on the operating pivot axis 24a supported; However, this is displaceable parallel to the web running direction.
  • the lifting device 23 is provided.
  • the outlet section 22b is supported on the additional fixed pivot axis 25a.
  • These Pivot axis 25a is - in contrast to the embodiment according to the figures 1A to 1C - permanently effective.
  • the two sections 22a and 22b of the carrying device are coupled together by means of a hinge 30. This area is located between the two sections 22a and 22b, a gap 31.
  • the inlet section 22a together with the inlet roller 16 and the dewatering box 19 pivots up about the operating pivot axis 24a, thus, the spout section 22b inclines slightly toward the inlet section 22a.
  • the gap 31 becomes smaller and the joint 30 moves slightly below.
  • the operating pivot axis 24a shifts slightly counter to the Web direction. If, according to FIG. 2C, a further lifting of the upper sieve assembly is desired, so the gap 31 decreases to the value zero.
  • a stop surface pair (at 32) provided.
  • FIG. 3 corresponds to that of FIGS. 1A to 1C, however, with the difference that the separating sucker 15a is not on the machine frame 9 rests but is attached to the support means 22 of the upper sieve assembly 20.
  • FIG. 4 shows an exemplary embodiment in which the Carrying device in a pivotable inlet section 22c and in a rigid on the machine frame 9 supported outlet section 22d is divided.
  • the two Sections 22c and 22d coupled by means of tabs 33, which during the normal Former prevailes rest on rigid supports 34.
  • the inlet section 22 c, at the in turn, the inlet roller 16 and the drainage box 19 are attached, is by means of the operating pivot axis 24c mounted on the tabs 33.
  • the tabs 33 in turn are by means of the additional pivot axis 25c in the rigid outlet section 22d, which also carries the outlet roller 17.
  • the pivotable inlet section 22c is relative to the tabs 33 can only be raised until a stop 35 is effective.
  • FIG. 2B shows further possible embodiments of the invention Cases, it is advantageous, the operating pivot axis exactly in the Sieblaufization the last bar 21 of the drainage box 19 to lay, as symbolically at 8 is shown.
  • the entire twin-wire former that is, in the Loop of the lower wire located drainage elements 14 and 15 and the entire top wire assembly 20a on carriage 9a to be arranged relative to the machine frame 9b, e.g. are displaceable parallel to the web running direction.
  • the entire twin-wire former relative to the other components of the Langsiebpartie (of which only the suction box 13 is visible) in different Bring positions.
  • a shaking motion the Doppelsiebformers by means of at least one Scblinlbockes is possible.

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  • Paper (AREA)
EP99101196A 1998-03-06 1999-01-22 Doppelsiebformer Expired - Lifetime EP0940500B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19809480 1998-03-06
DE19809480A DE19809480B4 (de) 1998-03-07 1998-03-07 Doppelsiebformer

Publications (3)

Publication Number Publication Date
EP0940500A2 EP0940500A2 (de) 1999-09-08
EP0940500A3 EP0940500A3 (de) 2000-12-20
EP0940500B1 true EP0940500B1 (de) 2005-06-15

Family

ID=7859838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101196A Expired - Lifetime EP0940500B1 (de) 1998-03-06 1999-01-22 Doppelsiebformer

Country Status (5)

Country Link
US (1) US6214167B1 (es)
EP (1) EP0940500B1 (es)
CA (1) CA2264998A1 (es)
DE (2) DE19809480B4 (es)
ES (1) ES2243020T3 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257296A1 (de) * 2002-12-07 2006-02-02 Voith Paper Patent Gmbh Doppelsiebformer
SE526798C2 (sv) * 2004-03-22 2005-11-08 Metso Paper Inc Dubbelvirapress med höj- och sänkbart avvattningsbord

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI72157C (fi) * 1974-07-18 1987-04-13 Valmet Oy Dubbelviradel i pappersmaskin.
US4146424A (en) * 1977-06-08 1979-03-27 Beloit Corporation Twin wire former with wire orientation control
AT382655B (de) * 1981-10-29 1987-03-25 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
AT385793B (de) * 1985-12-19 1988-05-10 Andritz Ag Maschf Siebbandpresse
US4724047A (en) * 1987-04-17 1988-02-09 The Black Clawson Company Horizontal twin wire machine
US4875977A (en) * 1987-04-17 1989-10-24 The Black Clawson Company Horizontal twin wire machine with vertically adjustable open roll and deflector blade
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
BR9207154A (pt) * 1992-08-19 1995-12-12 Beloit Technologies Inc Aparelho para formação de tira com múltiplas dobras
DE4326867C2 (de) * 1993-08-11 1997-01-30 Voith Gmbh J M Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen

Also Published As

Publication number Publication date
EP0940500A3 (de) 2000-12-20
US6214167B1 (en) 2001-04-10
DE59912172D1 (de) 2005-07-21
EP0940500A2 (de) 1999-09-08
ES2243020T3 (es) 2005-11-16
CA2264998A1 (en) 1999-09-06
DE19809480B4 (de) 2007-01-04
DE19809480A1 (de) 1999-09-09

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