EP0940500A2 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

Info

Publication number
EP0940500A2
EP0940500A2 EP99101196A EP99101196A EP0940500A2 EP 0940500 A2 EP0940500 A2 EP 0940500A2 EP 99101196 A EP99101196 A EP 99101196A EP 99101196 A EP99101196 A EP 99101196A EP 0940500 A2 EP0940500 A2 EP 0940500A2
Authority
EP
European Patent Office
Prior art keywords
twin
fourdrinier
wire
pivot axis
wedge angle
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
EP99101196A
Other languages
German (de)
English (en)
Other versions
EP0940500B1 (fr
EP0940500A3 (fr
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
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 Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0940500A2 publication Critical patent/EP0940500A2/fr
Publication of EP0940500A3 publication Critical patent/EP0940500A3/fr
Application granted granted Critical
Publication of EP0940500B1 publication Critical patent/EP0940500B1/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, 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 one Twin-wire former with the features specified in the preamble of claim 1.
  • the invention generally, but not exclusively, relates to a so-called hybrid former, in which the fiber suspension first flows onto the bottom wire.
  • the Bottom wire begins to form a web by removing water through the bottom wire downward.
  • the top wire comes into contact with the in the twin wire zone remaining fiber suspension, so that now the further web formation by water removal takes place through the top sieve, usually accompanied by further drainage down.
  • the path formation comes in the area the twin-wire zone at the end; i.e. there are no more free-floating fibers available.
  • further drainage takes place from here in the twin-wire zone of the fibrous web formed to keep its dryness as far as possible to increase.
  • the so-called inlet wedge angle i.e. the angle of the wedge-shaped Inlet zone
  • the twin wire former it is also desirable to locate the place where the top wire contacts the fiber suspension comes to shift, namely in the direction of web travel or in the opposite direction.
  • At least one additional complex lifting device is provided to to be able to adjust the position of the operating swivel axis vertically. This serves too the purpose of lifting the top screen assembly from the bottom screen, for example by Changing the sieves to facilitate or / or - in the event of an unwanted standstill one of the two screens - to avoid damaging the screens.
  • Figure 2 of the D3 is the Operating swivel axis in the area where the sieves from (in the loop of the Drain the drainage box located above.
  • This arrangement is also provided in the twin wire former according to the invention; it is cheap because one Change the inlet wedge angle of the strips of the drainage box (touching the top sieve) no significant horizontal movement relative to that in the bottom wire loop run arranged drainage elements. Such a relative movement would interfere with the proper formation of the fibrous web. Also becomes a significant vertical movement of the drain-side end of the drainage box avoided; such a vertical movement would be the proper one Disrupt the run of the two screens to the subsequent screen separator.
  • the main idea of the invention is, in addition to the operating pivot axis, which is in the area of the place where the sieves run from the drainage box, to provide a second pivot axis in the area of the outlet roller.
  • the second pivot axis by means of the single one Lifting device located in the area of the infeed roller is pivoted upwards if a lifting of the top screen assembly from the bottom screen is required so that a gap arises between the two sieves.
  • This second pivot axis only then effective after the maximum possible enlargement of the inlet wedge angle has taken place Has.
  • a further simplification is also conceivable if according to the independent claim 12 only a single pivot axis is provided for the top sieve assembly which is in the area between the drainage box and the drain roller orders.
  • the upper sieve assembly moves in particular about this pivot axis when changing the inlet wedge angle. If you take off the upper sieve assembly wishes to securely form a gap between the two screens, then the pivot axis is preferably placed in the area between the suction cup and the drain roller. However, you have to accept that that when the wedge angle changes, the drain-side end of the drainage box moved slightly vertically.
  • Figures 1A, 1B and 1C show a first embodiment with different Positions of the top sieve assembly.
  • FIGS 2A, 2B and 2C show another embodiment, again with different positions of the top sieve assembly.
  • a conventional Fourdrinier sieve or bottom sieve 11 in the essentially only that area with a top wire 12 a twin wire zone forms.
  • the bottom wire runs over drainage elements, e.g. Suction box 13, molding strips 14 and separating suction device 15.
  • the top wire 12 runs over three rollers 16, 17 and 18. Underneath is an inlet roller 16 which leads the top wire to the twin wire zone, whereby the sieves form a wedge-shaped inlet zone with a wedge angle k.
  • the roller 17 is the so-called outlet roller, which the top wire 12 in the region of the end of the twin wire zone back towards the infeed roller, with the top wire over a Regulating roller 18 runs.
  • a drainage box belongs to the top sieve assembly 19, which has a plurality of strips 21 on its underside which touch the top sieve, namely in that part of the twin-wire zone in which the forming strips 14 (by means of pneumatic pressure elements) resiliently pressed onto the lower sieve become.
  • the underside of the drainage box formed by the strips 21 19 can be flat or slightly convex or, for example, one inlet-side flat area and an outlet-side convexly curved area exhibit.
  • Each of the forming strips 14 is preferably opposite one Gap between two of the strips 21 of the drainage box 19th
  • Support device 22 is provided, for example one of two longitudinal beams and cross braces composite frame. Instead of cross braces can also only the drainage box 19 for cross-connection between the side members to serve.
  • the support device 22 (and thus the entire upper sieve assembly 20) is on a machine frame 9 supported, in the area of the feed roller 16 by means of a lifting device 23 and in the area where the screens 11, 12 from the drainage box 19 run, by means of a joint 24, which is the so-called operating pivot axis forms. This extends horizontally across the web running direction.
  • An additional pivot axis 25 is provided below the outlet roller 17 also extends horizontally across the machine.
  • the top wire assembly 20 is in positions which can take it during normal molding operation.
  • 1A is the Entry wedge angle k relatively small.
  • the lifting device 23 has the top sieve assembly compared to FIG. 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 those arriving on the lower wire 11 Suspension.
  • Such a change in the position of the top wire assembly can also serve the purpose of the point S where the top wire 12 is in contact with the suspension comes to shift a little in the direction of web travel.
  • the bearing blocks 26 of the outlet roller 17 are located in both FIGS. 1A and 1B disengaged from the additional pivot axis 25; see distance d.
  • 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 can be moved parallel to the direction of web travel.
  • the lifting device 23 is provided.
  • the outlet section 22b is supported on the additional, fixed pivot axis 25a.
  • pivot axis 25a is 1A to 1C - permanently effective.
  • the two sections 22a and 22b of the support device are coupled to one another by means of a joint 30.
  • the joint 30 lies in the area of the bisector 39 between the adjacent paths of the top wire 12.
  • FIG. 3 corresponds to that of FIGS. 1A to 1C, but with the difference that the separating suction 15a is not on the machine frame 9 rests but is attached to the support device 22 of the upper sieve assembly 20.
  • Figure 4 shows the embodiment described in claim 9, in which the Carrying device in a swiveling inlet section 22c and in a rigid on the machine frame 9 supported outlet section 22d is divided.
  • the two are there Sections 22c and 22d coupled to each other by means of tabs 33, which during the normal forming operation rest on rigid supports 34.
  • the inlet section 22c at which 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 in the rigid outlet section by means of the additional pivot axis 25c 22d mounted, which also carries the outlet roller 17.
  • the swiveling inlet section 22c can only be raised relative to the tabs 33 until a stop 35 becomes effective.
  • Figure 5 shows the embodiment described in claim 12, in which only a single pivot axis 40 is provided. This is in the range between Drainage box 19 and the drain roller 17, preferably between the vacuum cleaner 15 and the discharge roller 17.
  • FIG. 2B shows further possible refinements of the invention: in some It is advantageous in cases where the operating pivot axis is precisely in the screen running surface to place the last bar 21 of the drainage box 19, symbolically at 8 is shown.
  • the entire twin wire former i.e. the one in the Loop of the bottom wire located drainage elements 14 and 15 and the to arrange entire upper sieve assembly 20a on slide 9a, which is relative to the machine frame 9b, e.g. are displaceable parallel to the direction of web travel.
  • the entire twin wire former relative to the other components of the Four wire section (of which only the suction box 13 is visible) in different Bring positions.
  • Movability of the entire twin wire former is also conceivable by means of the carriages 9a by small amounts transversely to the direction of web travel, e.g. to avoid banding in the paper web.
  • a shake the twin wire former by means of at least one shaking frame is possible.

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  • Paper (AREA)
EP99101196A 1998-03-06 1999-01-22 Section de formage à deux toiles Expired - Lifetime EP0940500B1 (fr)

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 true EP0940500A2 (fr) 1999-09-08
EP0940500A3 EP0940500A3 (fr) 2000-12-20
EP0940500B1 EP0940500B1 (fr) 2005-06-15

Family

ID=7859838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101196A Expired - Lifetime EP0940500B1 (fr) 1998-03-06 1999-01-22 Section de formage à deux toiles

Country Status (5)

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

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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT382655B (de) * 1981-10-29 1987-03-25 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
US4724047A (en) * 1987-04-17 1988-02-09 The Black Clawson Company Horizontal twin wire machine
DE4326867A1 (de) * 1993-08-11 1993-12-16 Voith Gmbh J M Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen

Family Cites Families (8)

* 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
AT385793B (de) * 1985-12-19 1988-05-10 Andritz Ag Maschf Siebbandpresse
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
CA2142262C (fr) * 1992-08-19 1999-05-25 Paul T. Gray Machine a former des nappes multicouches

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT382655B (de) * 1981-10-29 1987-03-25 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
US4724047A (en) * 1987-04-17 1988-02-09 The Black Clawson Company Horizontal twin wire machine
DE4326867A1 (de) * 1993-08-11 1993-12-16 Voith Gmbh J M Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen

Also Published As

Publication number Publication date
DE19809480B4 (de) 2007-01-04
ES2243020T3 (es) 2005-11-16
DE59912172D1 (de) 2005-07-21
EP0940500B1 (fr) 2005-06-15
US6214167B1 (en) 2001-04-10
DE19809480A1 (de) 1999-09-09
CA2264998A1 (fr) 1999-09-06
EP0940500A3 (fr) 2000-12-20

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