EP0576798A1 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

Info

Publication number
EP0576798A1
EP0576798A1 EP93106775A EP93106775A EP0576798A1 EP 0576798 A1 EP0576798 A1 EP 0576798A1 EP 93106775 A EP93106775 A EP 93106775A EP 93106775 A EP93106775 A EP 93106775A EP 0576798 A1 EP0576798 A1 EP 0576798A1
Authority
EP
European Patent Office
Prior art keywords
guide surface
sieve
twin wire
wire former
former according
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
EP93106775A
Other languages
German (de)
English (en)
Other versions
EP0576798B2 (fr
EP0576798B1 (fr
Inventor
Alfred Dr. Bubik
Hans Dr. Dahl
Josef Dom
Karl Müller
Heinz Steckenreuter
Elmer Dr. Weisshuhn
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 Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Voith Sulzer Papiermaschinen 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6460898&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0576798(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0576798A1 publication Critical patent/EP0576798A1/fr
Application granted granted Critical
Publication of EP0576798B1 publication Critical patent/EP0576798B1/fr
Publication of EP0576798B2 publication Critical patent/EP0576798B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 according to the preamble of claim 1.
  • twin wire former is part of a paper machine and essentially serves to dewater a pulp suspension which is spread out on a permeable screen surface and is intended for paper production and to distribute or arrange the constituents contained in the suspension in the desired form.
  • This section of paper production is usually referred to as sheet formation, web formation or formation. This is where the quality of the paper produced later is decided.
  • the invention has for its object to provide a twin wire former with which the formation is very evenly possible and can be adjusted over a wide range.
  • the outlay on equipment should be kept as low as possible.
  • the guide surface for the first screen is not positioned rigidly, but rather by a force directed essentially against the screen, i.e. pressed non-positively against the bottom wire loop, the force thus applied essentially supporting the wire tension of the first wire, partly that of the second wire and the weight forces.
  • damping of oscillating sieve forces is also possible.
  • the advantage of the invention is particularly evident when other sieve-guiding parts are rigidly positioned in the immediate vicinity of the non-positively guided guide surface.
  • the shoe can dodge on the sieve even when the suspension height is approximately uneven ("soft nip entrance"). All of this results in a soft formation, as is particularly sought after in writing and printing paper. However, other types of paper also require good sheet uniformity.
  • the twin wire former can be optimally matched to the desired paper quality.
  • the fixed curvature, on the one hand, and the force-controlled change in position, on the other hand, result in smooth transitions when guiding the sieve in the former area, which is also important when reversing the direction of curvature.
  • the still very moist, dewatering between the seven guided webs can be improved by minimal shear movements without causing damage to the web.
  • the guide surface located in the second sieve has the opposite direction of curvature.
  • the water still contained can be directed particularly effectively into a suction roller or a suction box by suction support.
  • the suction box can, as seen in the running direction, contain a suction gap located at the front, which extends into the area of the curved guide surface located in the first sieve and thus into the area before the direction of curvature is reversed.
  • a suction box can be permanently installed in the second wire, i.e. it does not have to be adjustable during operation of the system, or a permanently installed suction roller can also be provided.
  • the self-sufficient according to the screen tension and the set support force for the guide surface located in the first screen will be sufficient to position the elements of the twin wire former in the desired manner relative to one another without changing the position of further guide surfaces.
  • another rigidly positioned drainage device is also conceivable in front of the yielding guide surface.
  • the strips 13 are arranged and shaped on the sieve table 12 so that the entirety of their surfaces facing the first sieve 1 forms a convex contour.
  • the surface of the individual strips itself is also expediently provided with a radius of curvature which corresponds approximately to the radius of curvature of the guide surface 4.
  • Deformable packing elements are shown as force elements 9, which can be filled with a pressure medium. In this way, a force in generate these elements, which is largely independent of the position of the sieve table 12 in the intended operating range.
  • the pressure is applied in a pressure vessel 15 connected by lines to the pressure vessel 15 serving as force elements 9.
  • This arrangement is also able to dampen oscillations by hydraulic line resistance.
  • the packing can also be loaded with different pressures.
  • the part of the twin wire former shown can also be designed as a suction box, which means that the water is sucked down between the strips 13.
  • FIG. 1 shows the example of a hybrid former
  • FIG. 2 shows a so-called gap former.
  • the wire section is omitted and the headbox 5 'guides the suspension directly as a wide jet into the area of the screen combination.
  • the curved guide surface 4 is produced here by a plate 13 'instead of strips, and the force elements 9 were also designed as springs.
  • these shapes are not tied to the existence of a hybrid former, but must be selected from different points of view. This also applies to the following figures.
  • the sheet formation area can be designed differently.
  • E.g. 4 shows a number of strips which are rigidly connected to one another in groups, each group again having force elements 9, both initially and at the end in the direction of wire travel.
  • a unit provided with two strips 16, which is mounted in a stationary manner can guide the first screen and can cause the web to be dewatered.
  • strips 16 ' which are resiliently pressed against the sieve 1 (FIG. 5).
  • Fig. 6 shows a further variant, namely pressure bars, which are partially one below the other rigidly connected and each with its own power elements.
  • the guide surface 7 for the second screen 2 is formed here by a suction roller 17.
  • the twin wire former according to the invention can also be a vertical former.
  • the suspension is injected essentially vertically between the screens 1 and 2 as a wide jet.
  • the guide surface 4 of the first screen 1 is located in the area where the screens are brought together.
  • the water is removed through both screens.
  • the adjoining guide surface 7 can be formed by a suction or forming roll. 8 shows that, in a special case, it can have the same direction of curvature as the preceding guide surface 4.

Landscapes

  • Paper (AREA)
  • Organic Insulating Materials (AREA)
  • Liquid Crystal Substances (AREA)
EP93106775A 1992-06-12 1993-04-27 Section de formage à deux toiles Expired - Lifetime EP0576798B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4219292 1992-06-12
DE4219292A DE4219292A1 (de) 1992-06-12 1992-06-12 Doppelsiebformer

Publications (3)

Publication Number Publication Date
EP0576798A1 true EP0576798A1 (fr) 1994-01-05
EP0576798B1 EP0576798B1 (fr) 1996-07-17
EP0576798B2 EP0576798B2 (fr) 1999-03-17

Family

ID=6460898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106775A Expired - Lifetime EP0576798B2 (fr) 1992-06-12 1993-04-27 Section de formage à deux toiles

Country Status (5)

Country Link
US (1) US5635032A (fr)
EP (1) EP0576798B2 (fr)
JP (1) JPH0657682A (fr)
AT (1) ATE140498T1 (fr)
DE (2) DE4219292A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000614A1 (fr) 2009-07-02 2011-01-06 Voith Patent Gmbh Unité de formage et procédé de fabrication d'une nappe de matière
WO2012004015A1 (fr) * 2010-07-09 2012-01-12 Voith Patent Gmbh Système de mise en feuille pour une machine de fabrication d'au moins une bande de matière fibreuse monocouche

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19648850A1 (de) * 1996-11-26 1998-05-28 Voith Sulzer Papiermasch Gmbh Saugvorrichtung und Pressenpartie einer Papiermaschine sowie Verfahren zum Besaugen eines Bahnabschnitts einer Papiermaschine
FI965277A (fi) * 1996-12-31 1998-07-01 Valmet Corp Paperikoneen imulaatikko ja menetelmä paperikoneen imulaatikossa
EP1697583A4 (fr) * 2003-12-22 2009-07-29 Astenjohnson Inc Dispositif de formation de type hybride pour machine a fabriquer le papier
CA2587706C (fr) * 2004-11-23 2010-11-09 Astenjohnson, Inc. Machine a papier a formeur double toile a sabot d'incidence a enveloppement variable
EP2356280B1 (fr) * 2008-10-21 2013-06-26 AstenJohnson, Inc. Section de formage à double toile à sabots d'égouttage multiples
DE102015224390A1 (de) * 2015-12-07 2016-12-29 Voith Patent Gmbh Saugkasten innerhalb einer Papiermaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131957A1 (de) * 1981-07-24 1983-02-10 Escher Wyss Gmbh, 7980 Ravensburg Entwaesserungseinheit fuer langsieb-papiermaschinen
EP0160615A2 (fr) * 1984-05-03 1985-11-06 Beloit Corporation Section de formage à double toile
US4648943A (en) * 1984-05-18 1987-03-10 Valmet-Dominion Inc. Vibrating forming shoe in a twin wire former
EP0397430A1 (fr) * 1989-05-08 1990-11-14 Valmet Paper Machinery Inc. Méthode et disposition pour former des feuilles continues de papier
EP0405154A1 (fr) * 1989-06-06 1991-01-02 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif de formation pour machine à papier
EP0486814A1 (fr) * 1990-11-20 1992-05-27 Voith Sulzer Papiermaschinen GmbH Partie humide pour machine à papier à deux toiles

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585105A (en) * 1967-05-26 1971-06-15 Beloit Corp Anti-deflection drain board method and apparatus
GB2143871B (en) * 1983-07-23 1986-11-12 Beloit Walmsley Ltd Twin wire paper forming machine
FI885606A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Banformningsfoerfarande och anordning.
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer
US5034098A (en) * 1990-02-23 1991-07-23 Beloit Corporation Method of forming a paper web
DE4107653A1 (de) * 1991-03-09 1992-09-10 Escher Wyss Gmbh Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine
DE9115632U1 (de) * 1991-12-17 1992-11-12 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebformer
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131957A1 (de) * 1981-07-24 1983-02-10 Escher Wyss Gmbh, 7980 Ravensburg Entwaesserungseinheit fuer langsieb-papiermaschinen
EP0160615A2 (fr) * 1984-05-03 1985-11-06 Beloit Corporation Section de formage à double toile
US4648943A (en) * 1984-05-18 1987-03-10 Valmet-Dominion Inc. Vibrating forming shoe in a twin wire former
EP0397430A1 (fr) * 1989-05-08 1990-11-14 Valmet Paper Machinery Inc. Méthode et disposition pour former des feuilles continues de papier
EP0405154A1 (fr) * 1989-06-06 1991-01-02 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif de formation pour machine à papier
EP0486814A1 (fr) * 1990-11-20 1992-05-27 Voith Sulzer Papiermaschinen GmbH Partie humide pour machine à papier à deux toiles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000614A1 (fr) 2009-07-02 2011-01-06 Voith Patent Gmbh Unité de formage et procédé de fabrication d'une nappe de matière
WO2012004015A1 (fr) * 2010-07-09 2012-01-12 Voith Patent Gmbh Système de mise en feuille pour une machine de fabrication d'au moins une bande de matière fibreuse monocouche

Also Published As

Publication number Publication date
EP0576798B2 (fr) 1999-03-17
DE4219292A1 (de) 1993-12-16
JPH0657682A (ja) 1994-03-01
ATE140498T1 (de) 1996-08-15
DE59303237D1 (de) 1996-08-22
US5635032A (en) 1997-06-03
EP0576798B1 (fr) 1996-07-17

Similar Documents

Publication Publication Date Title
DE4420801C2 (de) Verfahren zum Betreiben einer Doppelsiebzone einer Papiermaschine zur Herstellung von Faserstoffbahnen sowie Siebzone hierzu
DE2534290C3 (de) Siebpartie für Papiermaschinen
EP0607549A1 (fr) Procédé pour mettre en oeuvre une partie humide et dispositif pour l'application du procédé
EP0576798B1 (fr) Section de formage à deux toiles
DE3503242C2 (fr)
DE69416168T2 (de) Papierbahntrockner
DE3045279T1 (de) Method and device in a paper making machine
DE60106101T2 (de) Überführen einer Aufführspitze einer Papierbahn
DE69110260T2 (de) Doppelsiebformer in einer Papiermaschine.
DE69008364T2 (de) Überführvorrichtung bei einer gautschpresse sowie seiner verfahren.
DE1147470B (de) Vorrichtung zum Herstellen von Bahnen aus Papier, Pappe od. dgl.
EP1205599A2 (fr) Machine pour la fabrication d'une bande fibreuse
EP0608534A1 (fr) Presse humide pour une machine à papier
DE2754622B2 (de) Naßpartie einer Papiermaschine
DE2827840A1 (de) Papiermaschine mit vertikalem doppelsiebband
AT402746B (de) Doppelsiebformer mit örtlich verstellbarer entwässerungsleiste
DE4326867C2 (de) Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen
DE3120073A1 (de) Doppelsiebpapiermaschine
DE2550071A1 (de) Verfahren und vorrichtung zum abtrennen einer faserbahn von einem sie tragenden band
DE1461155A1 (de) Verfahren und Vorrichtung zum Entwaessern einer waesserigen Papierstoffsuspension bei Papiermaschinen
DE19803451A1 (de) Naßpartie und Verfahren zum Herstellen einer Faserstoffbahn
DE60213359T2 (de) Vorrichtung zur Herstellung einer Papier- oder Pappebahn
DE9207656U1 (de) Maschine zur Herstellung einer Faserstoffbahn
DE69119326T2 (de) Blattbildende Vorrichtung für eine Papiermaschine
DE9101248U1 (de) Trockenpartie für Papiermaschinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930427

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE GB IT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH SULZER PAPIERMASCHINEN GMBH

17Q First examination report despatched

Effective date: 19950503

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19960717

REF Corresponds to:

Ref document number: 140498

Country of ref document: AT

Date of ref document: 19960815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59303237

Country of ref document: DE

Date of ref document: 19960822

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960930

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: VALMET CORPORATION

Effective date: 19970417

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980323

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19980327

Year of fee payment: 6

PLAW Interlocutory decision in opposition

Free format text: ORIGINAL CODE: EPIDOS IDOP

PLAW Interlocutory decision in opposition

Free format text: ORIGINAL CODE: EPIDOS IDOP

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

ITF It: translation for a ep patent filed
27A Patent maintained in amended form

Effective date: 19990317

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): AT DE GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990427

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19960717

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20110414

Year of fee payment: 19

Ref country code: DE

Payment date: 20110421

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20110422

Year of fee payment: 19

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59303237

Country of ref document: DE

Effective date: 20121101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120427

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120428

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121101