EP1136620A2 - Section de formage à deux toiles - Google Patents

Section de formage à deux toiles Download PDF

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Publication number
EP1136620A2
EP1136620A2 EP01100939A EP01100939A EP1136620A2 EP 1136620 A2 EP1136620 A2 EP 1136620A2 EP 01100939 A EP01100939 A EP 01100939A EP 01100939 A EP01100939 A EP 01100939A EP 1136620 A2 EP1136620 A2 EP 1136620A2
Authority
EP
European Patent Office
Prior art keywords
twin
wire former
former according
jet
headbox
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
EP01100939A
Other languages
German (de)
English (en)
Other versions
EP1136620B1 (fr
EP1136620A3 (fr
Inventor
Alfred Bubik
Joachim Henssler
Jürgen Prössl
Mathias Schwaner
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 EP1136620A2 publication Critical patent/EP1136620A2/fr
Publication of EP1136620A3 publication Critical patent/EP1136620A3/fr
Application granted granted Critical
Publication of EP1136620B1 publication Critical patent/EP1136620B1/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 of a machine for production a fibrous web, in particular paper or cardboard web, with two revolving endless sieves, forming an inlet gap converge in the area of a moving drainage element, as well as with a headbox over which the fiber suspension is introduced into the stock inlet gap.
  • a twin wire former is described for example in WO 97/47803.
  • the strength development in packaging papers and in particular Carton depends on the amount of water that is on the forming roller of each Formers is removed.
  • the maximum also increases Jet height or thickness of the suspension jet emerging from the headbox at which there are still no backflows at the stock inlet gap are to be feared.
  • the achievable dimensionless ratio L / h increases Beam length L to beam thickness h with increasing suspension beam thickness h what happens in a streak-free formation without much influence the boundary layer turbulence of the headbox walls.
  • the aim of the invention is to provide a twin wire former of the type mentioned Way of creating with the taking into account the aforementioned circumstances in particular the highest possible web strength, one as possible streak-free formation of the web and a fluff that is as soft as possible Path structure is achieved.
  • the ratio is the maximum length between the exit gap of the headbox and the inlet gap running free Suspension jet to the thickness of the free suspension jet preferably less than 10.
  • the exit gap of the headbox is between two itself formed transverse to the jet direction nozzle walls, of which one is set back from the other, so the maximum Length of the free suspension jet through the given in the jet direction Distance between the recessed nozzle wall and the point of impact be determined on the side of the set back Suspension jet section lying on the nozzle wall onto the relevant sieve hits.
  • the moving drainage element can, for example, by a Roller or by a rotating, preferably over curved elements guided tape or cloth.
  • the respective roller can have an open or closed surface. You can with or be operated without a vacuum. With the respective volume or Cloth can in particular be an open band or cloth.
  • the moving dewatering or forming element can be one or more formation elements, one or more drainage elements and / or one or more fuel elements are provided his.
  • Twin-wire former has the one wrapped by the two screens co-moving drainage element in the looping area Radius of curvature equal to or greater than about 900 mm and in particular is greater than about 1000 mm. Is the moving drainage element formed by a roller, the roller diameter is preferred equal to or greater than about 1800 mm and in particular greater than about 2000 mm.
  • curved co-moving drainage element in the wrapping area curved co-moving drainage element is the ratio the radius of curvature to the thickness of the free suspension jet preferably less than about 45 and especially less than about 35.
  • looping length X over which the two sieves loop around the co-moving drainage element, and the thickness h of the free suspension jet are selected so that they are derived from the relationship (X * h) resulting value is in a range from about 140 to about 300 mm and preferably in a range from about 160 to about 300 mm.
  • the sieve speed v, the sieve tension T and the density ⁇ of the fiber suspension are expediently formed such that T h * ⁇ * v 2 > 1 is.
  • FIG. 1 of the drawing shows a schematic representation Twin-wire former 10 of a machine for producing a fibrous web 12, which is in particular a paper or cardboard web can.
  • the twin wire former 10 comprises two circulating endless screens 14, 16, forming a material inlet gap 18 in the area of a moving one Drainage or forming element 20 converge.
  • moving dewatering element 20 can be, for example a forming roller or one supported by strips or the like Trade ribbon or sheet.
  • the pulp suspension 12 ' is in the headbox by means of a headbox 24 Inlet gap 18 introduced.
  • twin wire section 26 following the present Embodiment formed by a forming roller moving dewatering element 20 can be more, especially the formation and / or drainage-serving elements 28, 30 can be provided.
  • the outer screen 14 is via a deflection roller 32 out through which it of the fibrous web 12 carrying Inner sieve 16 is separated.
  • a separating element 34 can also be provided his.
  • the outer screen 14 is returned to the breast roller 22 via a further deflection roller 36 following the deflection roller 32.
  • the consistency C of the fibrous suspension 12 'in the headbox 24 and the basis weight F of the fibrous suspension 12' introduced into the stock inlet gap 18 are chosen such that F / (C * 1000)> 0.025 is, the basis weight F in g / m 2 and the consistency C in g / l, ie in g / web length.
  • the ratio of the maximum length L between the exit gap 38 of the headbox 24 and the stock inlet gap 18 running free Suspension jet 40 to the thickness h of the free suspension jet 40 expediently less than 20 and in particular less than 10.
  • the outlet gap 38 of the headbox 24 is between two nozzle walls 42 extending transversely to the jet direction S, 44 formed, of which the upper 44 set back compared to the lower 42 is.
  • the maximum length L of the free suspension jet is 40 by the distance between in the beam direction S. the set back upper nozzle wall 44 and the impact point A, on the one on the side of the recessed upper nozzle wall 44 lying suspension beam section on the relevant screen, here this Outer sieve 14 hits.
  • the drainage element entrained by the two sieves 14, 16 20 has a radius of curvature in the wrapping area X. R, which is advantageously equal to or greater than about 900 mm and is in particular greater than about 1000 mm. In the present case it is co-moving drainage element 20 formed by a roller.
  • the roll diameter D is therefore expediently equal to or greater than approximately 1800 mm and in particular larger than about 2000 mm.
  • the angle of convergence ⁇ is preferably greater than or equal to approximately 1 °.
  • the ratio of the radius of curvature R of the drainage element 20 in the looping area X to the thickness h of the free suspension jet 40 is preferably less than about 45 and in particular less than about 35.
  • the radius of curvature R is equal to that Roll radius.
  • the sieving speed v, the sieving tension T and the density ⁇ of the fiber suspension 12 ' are expediently chosen such that T H * ⁇ * v 2 > 1 is.

Landscapes

  • Paper (AREA)
EP01100939A 2000-03-14 2001-01-17 Section de formage à deux toiles Expired - Lifetime EP1136620B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10012342 2000-03-14
DE10012342A DE10012342A1 (de) 2000-03-14 2000-03-14 Doppelsiebformer

Publications (3)

Publication Number Publication Date
EP1136620A2 true EP1136620A2 (fr) 2001-09-26
EP1136620A3 EP1136620A3 (fr) 2002-01-02
EP1136620B1 EP1136620B1 (fr) 2004-10-06

Family

ID=7634645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01100939A Expired - Lifetime EP1136620B1 (fr) 2000-03-14 2001-01-17 Section de formage à deux toiles

Country Status (3)

Country Link
US (1) US6521091B2 (fr)
EP (1) EP1136620B1 (fr)
DE (2) DE10012342A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US203A (en) * 1837-05-22 Improvement in fire-arms and ordnance
US162A (en) * 1837-04-17 Island
FR1546480A (fr) * 1967-02-28 1968-11-22 Papeteries Navarre Perfectionnements à la fabrication de structures fibreuses particulaires
AT328283B (de) * 1970-11-16 1976-03-10 Arledter Hanns F Dr Ing Verfahren und einrichtung zur herstellung vonfaserstoffbahnen mit raumlich ausgerichteten fasern
SE410482B (sv) * 1978-02-15 1979-10-15 Karlstad Mekaniska Ab Forfarande och anordning vid en dubbelviraformare
JPH01314797A (ja) * 1988-03-30 1989-12-19 Beloit Corp ウェブの形成装置
FI93032C (fi) * 1991-03-15 1995-02-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
FI93873C (fi) * 1992-12-08 1995-06-12 Valmet Paper Machinery Inc Menetelmä ja laite paperikoneen rainanmuodostusosan muodostuskidan yhteydessä
DE4443874C2 (de) 1994-12-09 1996-10-31 Voith Sulzer Papiermasch Gmbh Doppelsieb-Gap-Former zur Papierherstellung
US5593545A (en) * 1995-02-06 1997-01-14 Kimberly-Clark Corporation Method for making uncreped throughdried tissue products without an open draw
US5798024A (en) * 1996-06-11 1998-08-25 Valmet Corporation Controlling web anistropy in a roll and blade twin-wire gap former

Also Published As

Publication number Publication date
US6521091B2 (en) 2003-02-18
EP1136620B1 (fr) 2004-10-06
US20020096297A1 (en) 2002-07-25
DE10012342A1 (de) 2001-09-20
EP1136620A3 (fr) 2002-01-02
DE50103934D1 (de) 2004-11-11

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