EP0391025B1 - Section de formage à double toile - Google Patents

Section de formage à double toile Download PDF

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Publication number
EP0391025B1
EP0391025B1 EP90101039A EP90101039A EP0391025B1 EP 0391025 B1 EP0391025 B1 EP 0391025B1 EP 90101039 A EP90101039 A EP 90101039A EP 90101039 A EP90101039 A EP 90101039A EP 0391025 B1 EP0391025 B1 EP 0391025B1
Authority
EP
European Patent Office
Prior art keywords
wire
forming
twin
former according
roll
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
EP90101039A
Other languages
German (de)
English (en)
Other versions
EP0391025A1 (fr
Inventor
Heinz Braun
Alfred Dr. Bubik
Herbert Holik
Rüdiger Dr. Kurtz
Heinz Steckenreuter
Helmut Stieb
Jürgen Zenz
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
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0391025A1 publication Critical patent/EP0391025A1/fr
Application granted granted Critical
Publication of EP0391025B1 publication Critical patent/EP0391025B1/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 according to the preamble of claim 1.
  • twin wire former is known from DE-A-20 51 444.
  • the forming roller used there is not in the area of the suspension jet arriving from the headbox. The water thrown upwards is collected in a tub and braked.
  • DE-OS 31 23 132 shows a further twin wire former, but with pre-dewatering.
  • the front forming roller is arranged as an open forming roller above the top wire and throws water diagonally upwards, without however causing a propelling effect for secondary jets which occur in the area of the drainage strips , since here the rays run almost parallel at essentially the same speed.
  • twin-wire formers which work with an upper front forming roll and in the area of the upper wire, have drainage bars resting thereon, work with suction boxes which are arranged between the drainage bars in order to discharge the water laterally from the device.
  • the invention has for its object a twin wire former of the beginning to create the type mentioned, in which a more gentle and better drainage can be achieved within the forming zone in such a way that the formation process can be improved and in particular evened out without a negative influence on the retention of the fibers.
  • this water guiding element can be optimally, preferably relatively flatly curved, in adaptation to the flow conditions, i.e. approximate the course of the sieve.
  • the thrown-off water jet has a driving effect in that the optimal alignment and the optimal guidance of the thrown-off water jet as driving jet have a driving effect for the secondary jets in the area of the drainage strips. This applies in particular if there is a loss of energy in the area of the molding strips for water drainage.
  • the formation is also improved in that the drainage strips, which act as forming strips, rest on the upper sieve and in particular are pressed against them, so that the twin wire is deflected.
  • the forming strips are arranged in the rear half and in particular in the last third of the forming zone, it is avoided that the violent driving jet strikes the forming strips just behind the forming roller.
  • An essential advantage for the invention is the fact that the suspension, which has not been pre-dewatered, is fed to the converging twin wire and then dewatered in the loop area of the twin wire around the front forming roller, thus producing a very violent driving jet.
  • the angle at which the twin wire wraps around the forming roller is preferably 5 o to 120 o and in particular approximately 20 o . This wrap affects the strength of the jet.
  • the driving jet thicknesses can be between 2 and 19 mm, depending on the web speed of 300 to 2000 m / min. The driving jet usually makes up about 40% of the amount that is dewatered in the top sieve alone.
  • two or three and in particular three forming strips are provided.
  • the forming blades may be oriented inclined towards the Siebverlaufes and take it to the screen an angle of 20 ° to 90 ° and in particular approximately 37 o a. This affects the transition of the secondary jets along the forming strips into the main driving jet.
  • the forming strips are preferably arranged at a distance of less than 200 mm in order to achieve the best effect.
  • the water guiding element as the inner contour of an upper trough can initially rise flat from the forming roller, then be arranged essentially horizontally and then fall again towards the end of the forming zone, this guiding element being largely flat, so that the water jets are applied as a film flow by centrifugal force.
  • vacuum boxes can also be provided.
  • the forming roller can also be designed as a suction roller so that the lower drainage pressure of the outer wire that occurs at high speeds can be compensated for by vacuum.
  • front and rear refer to the running direction of the sieves and in particular the double sieve.
  • a forming roll 10 is shown schematically, namely as a so-called open forming roll, in the peripheral surface of which chambers are formed.
  • a lower wire 12 is fed to a suspension feed nip 14 which is formed by the lower wire 12 fed around the forming roller 10 and the upper wire 18 fed by a deflecting roller 16, the two wires meeting at a point D and from there to a twin wire form.
  • a suspension feed nozzle 20 is assigned to this feed gap 14.
  • the twin wire wraps around the forming roller 10 at an angle alpha which is between 5 o and 120 o , in the example shown about 20 o .
  • the twin wire runs at the right end in the drawing around a rear forming roller 5.
  • This forming roller 5 can be designed as a suction roller, as a full roller and / or can be grooved in the circumferential direction.
  • the bottom wire 12 carrying the fiber layer leaves this forming roller 5 at a point E, so that the forming zone is formed between the points D and E.
  • Below the lower wire 12 there are two formation shoes 22 and 22 'with vacuum boxes in the area of the double guide of the lower wire 12 and the upper wire 18 in this exemplary embodiment. These formation shoes rest with webs 24 spaced apart from one another on the lower wire.
  • the screen moves at a high speed. Since the suspension supplied by the nozzle 20 contains up to 99% water in addition to fibers and a filler, violent dewatering takes place in the wrapping area alpha to the effect that a propellant jet A is generated. This driving jet A is thrown off almost tangentially to the forming roller. Since the forming roll is designed as an open forming roll formed with circumferential chambers, a water jet A 'is also formed in the circumferential direction in order to simultaneously drain some of the water downward from the suspension.
  • the size of the wrapping of the forming roller significantly influences the force and the amount of water of the jet A, whereby jet thicknesses of 2 to 19 mm can be generated, depending on the web speed of 300 to 2000 m / min.
  • the jet makes approx. 40% the amount that is drained in the top sieve alone.
  • the driving jet A is directed as the main jet through a guide element 25 and 25 ′, which here consists of two sections, and which covers the entire forming zone by increasing the distance from the forming roller 10 to the twin wire in the direction of the point E. That means in this exemplary embodiment, in which the twin wire in the forming zone also rises slightly, the guide element also initially rises and then falls towards the end again, whereby an essentially horizontal section can also be provided. From the drawing it can be seen that the curvature of the guide element is relatively flat.
  • Section 25 'of the guide element can be pivoted upwards about a bearing axis 33 via a rod 31 in order to make the area in which the forming strips are located accessible for cleaning purposes.
  • three forming strips 26, 26 'and 26'' are located in the second half of the forming zone, starting approximately from the middle, but preferably in the last third, it also being possible for only two or more strips to be provided .
  • These strips rest with their lower end, preferably outside the webs 24, on the top wire and thus on the twin wire.
  • the forming strips are followed by guide surfaces 27, 27 ', 27''which are arranged at the angle shown to the screen. This angle is in the range of 20 to 90 o , but preferably in the range of 37 o .
  • the propellant jet has so much kinetic energy that the secondary jets B, C and C 'are also detected in the area of the forming strips 26, 26' and 26 '' and are then guided into a deflection trough 30.
  • the propellant jet cannot strike the strips directly, which in turn calms the flow conditions and therefore more gently and intensively drains leads in the area of the lasts.
  • the number of forming strips is equal to or greater than 2 and the distance is less than 200 mm, a very good effect can be achieved both with regard to the drainage and with regard to the formation of the fiber structure.
  • the water discharged through the top sieve is drained off at a point where it is less disturbing and more space is available.
  • the forming strips B, C and C ' lie on the top wire and are pressed onto the surface in such a way that the twin wire is deflected, either close to the forming shoe or between the webs 24 the formation shoes 22, 22 '.
  • the deflection is up to 10 mm, preferably 4 mm. For this, reference is made to FIG. 2.

Landscapes

  • Paper (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Claims (17)

  1. Formeur à toile double avec :
    - une toile supérieure (18) et une toile inférieure (12),
    - une buse d'apport de suspension (20) disposée en avant de l'endroit où la toile supérieure (18) et la toile inférieure (12) se joignent en formant la toile double (pour une suspension non préalablement égouttée),
    - un cylindre formeur (10), en particulier ouvert, disposé sous la toile inférieure (12),
    - un enroulement partiel des deux toiles autour du cylindre formeur (10),
    - un élément guide d'eau (25; 25') disposé dans la zone du cylindre formeur (10) au-dessus de la toile supérieure (18),
    - au moins un élément de formage (22; 22') reposant contre la toile inférieure (12), présentant, en tant qu'élément stationnaire de formage, une courbure plus plate que le cylindre formeur (10), et
    - au moins une latte de déshydratation (26; 26'; 26'') disposée au-dessus de la toile supérieure (18), en arrière du cylindre formeur dans le sens du mouvement de la toile double,
    caractérisé en ce que :
    - le cylindre formeur (10) se trouve au commencement de la zone de formage (D-E) et l'élément guide d'eau (25; 25') part à peu près du commencement de la zone de formage (D-E),
    - au moins un élément de formage (22; 22') reposant contre la toile inférieure (12) est disposé derrière le cylindre formeur (10), dans le sens de mouvement de la toile double,
    - les lattes de déshydratation (26; 26'; 26'') sont des lattes à action de formage et en tant que telles reposent sur la toile supérieure (18) en exerçant une pression sur elle, et
    - des surfaces de guidage (27; 27'; 27'') se raccordent aux lattes de formage (26; 26'; 26'') en se terminant à distance de l'élément guide d'eau (25; 25').
  2. Formeur à toile double selon la revendication 1, caractérisé en ce que l'élément stationnaire de formage (22; 22') est, de manière connue en soi, sous la forme d'un patin de formage avec des barres (24; 24') disposées transversalement au sens du mouvement des toiles et espacées entre elles.
  3. Formeur à toile double selon la revendication 2, caractérisé en ce que les lattes de formage (26; 26'; 26'') reposent sur la toile double (12, 18) avec une pression telle que cette toile subit une déviation.
  4. Formeur à toile double selon les revendications 1 et 2, caractérisé en ce que les lattes de formage (26; 26'; 26'') reposent sur la toile supérieure entre les barres (24; 24') du patin de formage.
  5. Formeur à toile double selon la revendication 4, caractérisé en ce que l'enroulement de la toile double (12, 18) autour du cylindre formeur (10) est prévu, par rapport à une verticale passant par l'axe du cylindre formeur (10), dans la moitié antérieure du cylindre formeur (10).
  6. Formeur à toile double selon une des revendications 1 à 5, caractérisé en ce qu'à l'extrémité de la zone de formage (D-E) est disposé un cylindre formeur postérieur (5) qui se trouve également sous la toile inférieure (12).
  7. Formeur à toile double selon une des revendications 1 à 6, caractérisé en ce que la déviation de la toile double par suite de l'appui à pression des lattes de formage (26; 26'; 26'') va jusqu'à 10 mm et est, en particulier, de 4 mm.
  8. Formeur à toile double selon une des revendications 1 à 7, caractérisé en ce que la position du point (D) de départ de la toile double (12, 18) à partir du cylindre formeur antérieur (10) se trouve dans le quadrant supérieur antérieur, et de préférence dans la section angulaire entre 310° et 360°.
  9. Formeur à toile double selon une des revendications 1 à 8, caractérisé en ce que les lattes de formage (26; 26'; 26'') sont disposées dans les deux derniers tiers, et en particulier dans le dernier tiers de la zone de formage (D-E).
  10. Formeur à toile double selon une des revendications 1 à 9, caractérisé en ce que la toile double (12, 18) entoure le cylindre formeur (10) sous un angle (alpha) de 5° à 120° et en particulier d'environ 20°.
  11. Formeur à toile double selon une des revendications 1 à 10, caractérisé en ce que sont prévues deux ou trois lattes de formage (26; 26'; 26'').
  12. Formeur à toile double selon la revendication 1, caractérisé en ce que les surfaces de guidage (27; 27'; 27'') sont disposées inclinées dans le sens de passage des toiles en formant par rapport aux toiles un angle de 20 à 90° et, en particulier, un angle d'environ 37°.
  13. Formeur à toile double selon une des revendications 1 à 12, caractérisé en ce que les lattes de formage (26; 26'; 26'') sont disposées le long de la toile double à un espacement entre elles inférieur à 200 mm.
  14. Formeur à toile double selon une des revendications 1 à 13, caractérisé en ce que l'élément de guide d'eau (25; 26') est disposé tout d'abord ascendant à plat, et est ensuite pratiquement horizontal et ensuite redescendant.
  15. Formeur à toile double selon une des revendications 1 à 14, caractérisé en ce que l'élément guide d'eau (25; 25') se compose de plusieurs sections dont les emplacements peuvent être modifiés pour faire varier la disposition d'ensemble des surfaces de guidage.
  16. Formeur à toile double selon une des revendications 1 à 14, caractérisé en ce qu'une section de l'élément guide d'eau (25; 25') qui recouvre les lattes de formage (26; 26'; 26'') peut être écartée en pivotant.
  17. Formeur à toile double selon une des revendications 1 à 16, caractérisé en ce que le cylindre formeur (10) est sous la forme d'un cylindre à aspiration.
EP90101039A 1989-04-04 1990-01-19 Section de formage à double toile Expired - Lifetime EP0391025B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910892A DE3910892A1 (de) 1989-04-04 1989-04-04 Doppelsiebformer
DE3910892 1989-04-04

Publications (2)

Publication Number Publication Date
EP0391025A1 EP0391025A1 (fr) 1990-10-10
EP0391025B1 true EP0391025B1 (fr) 1994-09-21

Family

ID=6377839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101039A Expired - Lifetime EP0391025B1 (fr) 1989-04-04 1990-01-19 Section de formage à double toile

Country Status (6)

Country Link
EP (1) EP0391025B1 (fr)
AT (1) ATE111990T1 (fr)
CA (1) CA2012251A1 (fr)
DE (1) DE3910892A1 (fr)
ES (1) ES2058612T3 (fr)
FI (1) FI900730A0 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI83977C (fi) * 1989-11-06 1991-09-25 Valmet Paper Machinery Inc Gapformare i pappersmaskin.
DE4037017C2 (de) * 1990-11-20 1994-12-08 Escher Wyss Gmbh Naßteil einer Doppelsieb-Papiermaschine
JP2808491B2 (ja) * 1990-12-19 1998-10-08 三菱重工業株式会社 抄紙機のツインワイヤフォーマ
FI93032C (fi) * 1991-03-15 1995-02-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
DE10106731A1 (de) * 2001-02-14 2002-08-22 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
DE102010042604A1 (de) 2010-10-19 2012-04-19 Voith Patent Gmbh Blattbildungseinheit zur Herstellung einer Materialbahn und Verfahren zum Betreiben der Blattbildungseinheit
FI11620U1 (fi) * 2016-12-08 2017-04-12 Valmet Technologies Oy Viiraosa, erityisesti modernisoitu viiraosa
CN107460760B (zh) * 2017-09-13 2019-03-01 长兴恒大电子材料有限公司 一种热转移纸生产加工工艺

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296135A2 (fr) * 1987-06-18 1988-12-21 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1294075A (en) * 1969-02-13 1972-10-25 Beloit Corp Improved forming arrangement
BE757784R (fr) * 1969-10-22 1971-04-01 Beloit Corp Dispositif ameliore de formage
DE2102717A1 (de) * 1970-01-26 1971-08-12 Enso Gutzeit Oy Verfahren und Vorrichtung zur Herstellung von Papier, Karton oder einer ähnlichen Fasermaterialbahn
DE2826158B2 (de) * 1978-06-15 1980-07-24 J.M. Voith Gmbh, 7920 Heidenheim Siebpartie für eine Maschine zur Herstellung von Faserbahnen
EP0073223B2 (fr) * 1981-02-28 1988-01-13 J.M. Voith GmbH Dispositif pour deshydrater de maniere continue une bande continue de fibres
DE3153305C2 (de) * 1981-09-04 1986-10-23 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI75376C (fi) * 1982-04-30 1988-06-09 Valmet Oy Formningssko foer formare i pappersmaskin.
FI840246A (fi) * 1984-01-20 1985-07-21 Valmet Oy Foerfarande och anordning vid formning av pappersbana.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296135A2 (fr) * 1987-06-18 1988-12-21 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile

Also Published As

Publication number Publication date
CA2012251A1 (fr) 1990-10-04
ES2058612T3 (es) 1994-11-01
DE3910892C2 (fr) 1993-09-09
FI900730A0 (fi) 1990-02-14
EP0391025A1 (fr) 1990-10-10
DE3910892A1 (de) 1990-10-11
ATE111990T1 (de) 1994-10-15

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