EP0894894A2 - Procédé et dispositif pour la formation d'une bande de papier - Google Patents

Procédé et dispositif pour la formation d'une bande de papier Download PDF

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Publication number
EP0894894A2
EP0894894A2 EP98111854A EP98111854A EP0894894A2 EP 0894894 A2 EP0894894 A2 EP 0894894A2 EP 98111854 A EP98111854 A EP 98111854A EP 98111854 A EP98111854 A EP 98111854A EP 0894894 A2 EP0894894 A2 EP 0894894A2
Authority
EP
European Patent Office
Prior art keywords
constant pressure
elements
forming
pressure drainage
belts
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.)
Withdrawn
Application number
EP98111854A
Other languages
German (de)
English (en)
Other versions
EP0894894A3 (fr
Inventor
Günter Dr. Halmschlager
Josef Bachler
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 Sulzer Papiermaschinen 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 Sulzer Papiermaschinen GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0894894A2 publication Critical patent/EP0894894A2/fr
Publication of EP0894894A3 publication Critical patent/EP0894894A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the invention relates to a method for forming a fibrous web, in particular a thick paper or cardboard web, made of a fiber suspension.
  • the invention also relates to an apparatus for performing this method.
  • the invention is based on a method with those specified in the preamble of claim 1 Procedural steps.
  • an additional requirement may be that the finished The fibrous web should have the lowest possible two-sidedness.
  • An essential idea of the invention is that two different drainage zones connected in series as follows: In the the first drainage zone, the drainage is controlled in a known manner in such a way that the finished fibrous web has the best possible formation. Preferably pressure pulsations are generated in the suspension that is still present.
  • This drainage pressure can be substantially constant in the direction of web travel, but preferably in The web running direction increases at least approximately continuously.
  • This constant pressure drainage preferably takes place on both sides, i.e. through both porous bands.
  • the advantage of the good formation of many known twin wire formers with the advantage of a high drainage capacity of constant pressure drainage connected add to that the energy-intensive and only one-sided known suction devices can at least partially be omitted, so that the operating and investment costs are significantly reduced. In many cases can also achieve a reduced space requirement for the device according to the invention thanks to the intensive bilateral drainage in the constant pressure drainage zone.
  • a fibrous web in particular one with a relatively high specific basis weight, can be produced more cost-effectively than before without the risk of the web structure being destroyed (microcrushing). It is possible, as is known per se, to locally vary the contact pressures acting on the constant pressure drainage elements transversely to the web running direction in order to thereby optimize the moisture cross profile. In many cases, this can be an important measure to ensure high product quality.
  • the best possible Formation "of the finished product is preferably achieved (as is known) with the aid of resiliently adjustable forming strips, to be arranged in the initial region of the double belt zone.
  • Figure 1 shows a twin wire former (similar to document D1) in a schematic Side view. It is suitable for the production of particularly thick webs.
  • FIG. 2 schematically explains the formation of the fibrous web.
  • Figures 3 to 5 show further different twin wire formers in a schematic Side view.
  • Figures 6 and 7 show different types of multi-layer screen sections.
  • FIG. 8 shows a further twin wire former.
  • a headbox 1 which feeds a pulp suspension stream (with the thickness d) to an endless rotating lower sieve belt S1.
  • This below “Sieve belt S1 called” sieve belt S1 runs on the headbox 1 in a known manner over a lower breast roll 10 and over a sieve table 2 and then over a plurality of forming strips 3, which also Drainage strips ".
  • An upper endless screen belt S2, hereinafter “Upper sieve” runs in the area of the headbox 1 over an upper breast roller 9 and then over upper forming bars 6. The arrangement is such that the upper sieve converges to the lower sieve S1 after leaving the upper breast roller 9. It occurs in the area between the upper Breast roller 9 and the first upper forming bar 6 in contact with the suspension, see contact point K.
  • the upper forming strips 6 are designed as stationary strips, the lower forming strips 3, however, as flexible strips, of which each rests on a pneumatic hose 4.
  • the internal pressure in each of the pneumatic hoses 4 is individually adjustable, so that each of the strips 3 with a freely selectable Force is resiliently pressed against the inside of the lower sieve S1.
  • Each of the lower strips 3 is relative to a stationary machine frame 5 slidable in the vertical direction. That through the mesh of the bottom wire S1 penetrating water is removed from the bottom sieve by the strips 3 and flows down under gravity.
  • each of the upper strips 6 in FIG. 1 is on a so-called skimmer 7 attached.
  • This is a vacuum chamber equipped with a suction channel, which is connected to a vacuum source 12 via a line system 11.
  • the lower and upper strips 3 and 6 are preferred in the running direction of the sieves arranged along an imaginary zigzag line.
  • a so-called constant pressure drainage zone GE In the rear area of the twin wire zone is a so-called constant pressure drainage zone GE provided, formed essentially from an upper and a lower fluid-permeable (e.g. perforated) or with recesses (e.g. longitudinal grooves) provided plate 15 or 16.
  • the upper plate 15 touching the upper sieve S2 is (preferably) attached to the bottom of a vacuum drain box 71. This can be omitted on narrow machines.
  • the lower plate 16 to which a vibration generator 19 can be connected, rests on several pneumatic hoses 4a, the internal pressure of which is in turn individually adjustable. So that is Plate 16 can be flexibly pressed onto the lower sieve S1.
  • the plates 15, 16 can be made of a flexible material.
  • a stationary support structure 8 is provided for the top wire S2. At this are attached: bearings for the upper breast roller 9, the skimmer 7 with the upper drainage strips 6 and the vacuum box 7a with the plate 15. Likewise, attached to it are the bearings for wire guide rolls, e.g. 9a, the endless top sieve Return S2 to breast roller 9. As indicated by double arrows at 14, each of the ends of the support structure 8 can be individually adjusted in height, thereby the distance between the two screens and their convergence angle and thus to be able to adjust the position of the contact point K as desired.
  • FIG. 1 shows schematically how from the suspension stream (with the thickness d)
  • a gradually thicker fiber mat 17 or 18 forms on each of the two sieve belts S1 and S2 .
  • a tapering and fluid part of the suspension flow There remains between these two fiber mats a tapering and fluid part of the suspension flow.
  • immobility line I Somewhere in the area of the equilibrium pressure drainage zone GE or in front of it is the so-called immobility line I (which runs across the entire width of the railway).
  • immobility line I which runs across the entire width of the railway.
  • FIG. 3 shows a so-called gap former (similar to document D3, FIG. 6); Figure 4 shows some alternatives.
  • the two screen belts S1 and S2 form a gusset on the circumference of a forming suction roll 10A, into which the suspension flow in the form of a free jet is created by means of the headbox 1A
  • a multi-layer headbox is provided here as an example.
  • the top wire S2 runs from a wire guide roller 9A onto the forming roller, which (for example only) is designed as a suction roller 10A. It wraps around this in the area of the forming zone FZ.
  • Forming bars 3A can be provided, each of which can be pressed against the top wire S2 in a flexible manner in the direction of the roller 10A by means of a pneumatic hose 4.
  • the water is drained upwards in FIG. 3 - due to the kinetic energy of the water - by means of a collecting container 27, or according to FIG. 4 by means of a suction chamber 7A.
  • a headbox 1B a forming suction roll 10B and a wire guide roller 9B are provided.
  • One from two sieve belts S1 and S2 formed twin-wire zone wraps around half of the circumference the forming suction roll 10B and then extends to a wire suction roll 21.
  • resiliently pressable forming strips 3B are provided be (these can also be omitted).
  • a constant pressure drainage zone according to the invention GE provided, formed from several perforated and articulated plate segments 16B chained together. Each of these plate segments is by means of freely selectable forces in the direction of the roller 10B to the one belt S1 can be pressed. Both the forming strips 3B and the plate segments 16B are resiliently supported on a pivotable support device 22.
  • the compliance is symbolically represented here by compression springs. In practice you will however, again use pneumatic hoses. In many cases you will, thanks of the invention, instead of the screen suction roller 21, a normal solid jacket roller 21A can use (cost saving!); see dash-dotted variant.
  • FIG. 6 shows an example of a twin gap former (similar to DE 44 02 273) from a first twin wire former UF for the lower layer and a second one Twin wire former OF for the upper paper layer.
  • the two twin wire formers are with regard to the arrangement of their drainage elements in relation to the direction of paper travel, constructed the same way, with the direction of rotation directed towards each other. It is one upper and lower screen U1 and U2 or 01 and 02 are provided for each twin wire former, which revolves over a corresponding number of deflection rollers, so that it is the from the headbox U3 or 03 released stock suspension sandwiched between includes the top and bottom sieve.
  • the bottom wire U2 or 02 is placed over a forming suction roll U4 and 04 directed through which the first part of the drainage takes place.
  • section II of the twin wire former consists of a large number of resiliently pressable Last on a suction box U5 or 05, which is located within the bottom wire U2 or 02 is located. Opposite the strips (which can also be omitted) is located each a further suction box U6 or 06, on which a variety of fixed Drainage strips are arranged and located in the sieve loop of the respective Upper sieve is located. Section III is followed by section III with a fixed one Drainage element U7 or 07 in the sieve loop of the lower sieve. Thereon A vacuum cleaner U8 or 08 is provided below, which separates the Upper sieve 01 or U1 supported by the paper layer on the lower sieve.
  • the lower wire 02 of the upper twin wire former OF is deflected downwards via a deflecting roller, while the lower wire U2 of the lower twin wire former UF continues straight, so that the two paper layers formed are combined with one another ( Then both bottom sieves U2 and 02 with the web in between run through a constant pressure dewatering zone GE according to the invention.
  • This serves for the particularly intensive connection of the two layers of paper; it can be identical or similar to that according to FIG. 1 or 3, for example in the form of two perforated plates 15C and 16C, the lower plate 16C has a separation suction zone 13C at its outlet end.
  • FIG. 7 shows the complete, similar patent application as a further alternative 19704443.3 (PA 10482) designed wet part of a paper machine, the total is designated by the number 80.
  • a twin wire former 86 becomes one Headbox 88 supplies and comprises a top sieve 98 and in a manner known per se a bottom wire 100, which are passed over a forming roller 90.
  • On the forming roller 90 follows e.g. formation box 92 bulged downward. This can (but must not) cooperate with flexible forming strips 93. Connect to that further strips or support foils 94.
  • the twin wire former 86 in which a first paper layer is produced, follows a second former (a so-called crescent former) 97, which consists of a headbox 99 is supplied. Between a felt belt 102 guided over a forming roller 91 and a screen 101, a second paper layer is produced, which is the same as that in the twin-wire former 86 generated first layer is merged.
  • the intimate curling up the two layers take place between top sieve 98 and felt belt 102, again in a constant pressure drainage zone GE, by means of a fluid permeable and (Exemplary) plate 15E removed downwards and some resilient against it adjustable plate segments 16E.
  • the felt belt 102 of the crescent former then runs 97 by train to the press section.
  • the web runs between the felt belt 102 and an upper felt 104.
  • Such an embodiment with a combination of a first former, which acts as a twin wire former is formed and a second former, which is designed as a crescent former is advantageous, paper webs can be produced in which a first thick layer that is created in the twin wire former, a second thinner layer is applied, which is generated in the crescent former.
  • Figure 8 shows an embodiment of the invention in which the career of Sieves S1, S2 through the constant pressure drainage zone GE steeply from above runs below.
  • the constant pressure drainage zone can be from below upwards, e.g. extend vertically or inclined against an imaginary vertical.
  • An advantage of these arrangements is that water can drain from the perforations the upper plate or plates 15F is facilitated because they are predominant done in the horizontal direction; As a rule, no negative pressure is required for this. 8 shows the following in detail:
  • the two screen belts S1 and S2 form between a forming roller 130 and one Breast roll 132 has a wedge-shaped inlet gap, which is directly from a Headbox 126 receives a pulp suspension, approximately horizontally Direction.
  • the two sieves essentially loop around the upper descending one Quadrants of the forming roller 130.
  • the two screens S1 and S2 run down from the forming roller from. They then run over an arranged in the loop of the top wire S2, convex curved formation shoe 114.
  • constant pressure drainage elements 15F and 16F provided; these are perforated plates or plate segments.
  • the stationary plate 15F arranged in the loop of the top wire S2 is Part of a stationary water collection box.
  • the opposite and in the Loop of the lower sieve S1 arranged plate 16F rests with the help of pneumatic hoses on another stationary box; this means that it can be selected Forces can be flexibly adjusted to the lower sieve S1.
  • the jacket of the forming roller 130 has recesses for temporary use in a known manner Storing water, e.g. in the form of a honeycomb cover and one sieve stockings attached to it.
  • the forming roller 130 be designed as a suction roller.
  • Deflection roller 142 At the end of the steeply descending section of the twin-wire zone is one Deflection roller 142 is provided, which the two screen belts S1 and S2 in one redirects substantially horizontal or slightly upward running direction.
  • a separating suction device 115 is provided in the loop of the lower wire S1, where the top wire S2 is separated from the bottom wire and from the paper web on it separates. If necessary, can be between the deflection roller 142 and the Separating suction 115 arranged an additional constant pressure drainage zone become.
  • the top wire S2 runs back from the separating suction device 115 via guide rollers 146 Breast roll 132.
  • the lower screen S1 runs after the separating suction 115 - if necessary via at least one further suction box 137 - to a screen suction roll 133, then via guide rollers 141 back to the forming roller 130.
  • the paper web formed in a known manner by means of a Felt and a take-off roller removed from the lower wire S1 (not shown).

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EP98111854A 1997-08-01 1998-06-26 Procédé et dispositif pour la formation d'une bande de papier Withdrawn EP0894894A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997133316 DE19733316A1 (de) 1997-08-01 1997-08-01 Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn
DE19733316 1997-08-01

Publications (2)

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EP0894894A2 true EP0894894A2 (fr) 1999-02-03
EP0894894A3 EP0894894A3 (fr) 1999-12-08

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EP98111854A Withdrawn EP0894894A3 (fr) 1997-08-01 1998-06-26 Procédé et dispositif pour la formation d'une bande de papier

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DE (1) DE19733316A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0933473A2 (fr) * 1998-01-30 1999-08-04 Voith Sulzer Papiertechnik Patent GmbH Formeur a deux toiles
EP1024224A2 (fr) * 1999-01-28 2000-08-02 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour la fabrication d' une bande fibreuse
WO2001036742A2 (fr) * 1999-11-17 2001-05-25 Andritz Ag Dispositif d'assechement pour bande de matiere fibreuse
US6375799B1 (en) 1999-01-28 2002-04-23 Voith Sulzer Papiertechnik Patent Gmbh Process and apparatus for producing a fibrous material web
EP1319745A1 (fr) * 2001-12-12 2003-06-18 Voith Paper Patent GmbH Section de formage à deux toiles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015827A1 (de) * 2000-03-30 2001-10-11 Voith Paper Patent Gmbh Maschine zur Herstellung einer mehrlagigen Faserstoffbahn
DE10015828A1 (de) * 2000-03-30 2001-10-11 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Gipskartonbahn
US6932886B2 (en) 2000-03-30 2005-08-23 Voith Paper Patent Gmbh Multi-ply fibrous plasterboard web
DE10021320A1 (de) 2000-05-02 2001-11-08 Voith Paper Patent Gmbh Doppelsiebformer
DE202012013055U1 (de) 2012-03-22 2014-09-05 Voith Patent Gmbh Siebwasserauffanganlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2323519A1 (de) * 1973-05-10 1974-11-21 Voith Gmbh J M Keilpresse zum kontinuierlichen entwaessern einer faserstoffbahn, insbesondere faserplattenbahn
WO1995019467A1 (fr) * 1994-01-13 1995-07-20 Voith Sulzer Papiermaschinen Gmbh Procede et machine a deux toiles permettant de realiser une bande de matiere fibreuse
EP0933473A2 (fr) * 1998-01-30 1999-08-04 Voith Sulzer Papiertechnik Patent GmbH Formeur a deux toiles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301103C1 (de) * 1993-01-18 1994-08-18 Voith Gmbh J M Siebpartie einer Papiermaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2323519A1 (de) * 1973-05-10 1974-11-21 Voith Gmbh J M Keilpresse zum kontinuierlichen entwaessern einer faserstoffbahn, insbesondere faserplattenbahn
WO1995019467A1 (fr) * 1994-01-13 1995-07-20 Voith Sulzer Papiermaschinen Gmbh Procede et machine a deux toiles permettant de realiser une bande de matiere fibreuse
EP0933473A2 (fr) * 1998-01-30 1999-08-04 Voith Sulzer Papiertechnik Patent GmbH Formeur a deux toiles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0933473A2 (fr) * 1998-01-30 1999-08-04 Voith Sulzer Papiertechnik Patent GmbH Formeur a deux toiles
EP0933473A3 (fr) * 1998-01-30 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Formeur a deux toiles
US6267846B1 (en) 1998-01-30 2001-07-31 Voith Sulzer Papiertechnik Patent Gmbh Twin wire former and method of manufacturing a fibrous material web from a fibrous suspension using same
EP1024224A2 (fr) * 1999-01-28 2000-08-02 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour la fabrication d' une bande fibreuse
US6375799B1 (en) 1999-01-28 2002-04-23 Voith Sulzer Papiertechnik Patent Gmbh Process and apparatus for producing a fibrous material web
EP1024224A3 (fr) * 1999-01-28 2003-07-16 Voith Paper Patent GmbH Procédé et dispositif pour la fabrication d' une bande fibreuse
WO2001036742A2 (fr) * 1999-11-17 2001-05-25 Andritz Ag Dispositif d'assechement pour bande de matiere fibreuse
WO2001036742A3 (fr) * 1999-11-17 2002-01-10 Andritz Ag Maschf Dispositif d'assechement pour bande de matiere fibreuse
EP1319745A1 (fr) * 2001-12-12 2003-06-18 Voith Paper Patent GmbH Section de formage à deux toiles
US7008511B2 (en) 2001-12-12 2006-03-07 Voith Paper Patent Gmbh Wire section

Also Published As

Publication number Publication date
EP0894894A3 (fr) 1999-12-08
DE19733316A1 (de) 1999-02-04

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