EP1024224A2 - Procédé et dispositif pour la fabrication d' une bande fibreuse - Google Patents

Procédé et dispositif pour la fabrication d' une bande fibreuse Download PDF

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Publication number
EP1024224A2
EP1024224A2 EP99125356A EP99125356A EP1024224A2 EP 1024224 A2 EP1024224 A2 EP 1024224A2 EP 99125356 A EP99125356 A EP 99125356A EP 99125356 A EP99125356 A EP 99125356A EP 1024224 A2 EP1024224 A2 EP 1024224A2
Authority
EP
European Patent Office
Prior art keywords
web
additive
drainage
belts
fibrous web
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
EP99125356A
Other languages
German (de)
English (en)
Other versions
EP1024224B1 (fr
EP1024224A3 (fr
Inventor
Günther Dr. Halmschlager
Josef Bachler
Christoph Merkens
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 EP1024224A2 publication Critical patent/EP1024224A2/fr
Publication of EP1024224A3 publication Critical patent/EP1024224A3/fr
Application granted granted Critical
Publication of EP1024224B1 publication Critical patent/EP1024224B1/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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section

Definitions

  • the invention relates to a method for forming a fibrous web, in particular one Paper or cardboard web, from a fiber suspension.
  • the invention also relates to an apparatus for performing this method.
  • the starting point of the invention is the not yet published patent application EP0894894 (file PA10569 EP K).
  • one is formed Fibrous web between two endless, water-permeable belts, preferably Sieve belts. This is done in a known manner in that part of the suspension liquid is removed through the tapes. Be part of this web formation zone the tapes, together with the fibrous web that forms between them so-called constant pressure drainage elements (e.g. in the form of perforated plates) passed through.
  • constant pressure drainage elements e.g. in the form of perforated plates
  • the resulting An additive is added to the fibrous web by passing it through one of the constant pressure drainage elements through and through the porous belt running over it flows.
  • An additive is, for example, a dye, filler, glue or drainage aid intended.
  • the present invention has for its object the web forming method and to develop the associated device in such a way that certain properties the finished fibrous web can be improved.
  • the Addition of the additive controls or regulates that the fibrous web formed the each has the desired (low or clearly detectable) bilateralism.
  • the addition of the additive is controlled or regulated in such a way that a certain surface property (or with respect to a certain to the Web surfaces of measurable grade) a certain relationship between the properties or grades of the two web sides is achieved.
  • both sides of the running fibrous web e.g. paper web
  • the running fibrous web e.g. paper web
  • the degree of two-sidedness is from the desired value of the two-sidedness (target value) deviates, then - preferably with the help of a closed control loop - for example the volume flow and / or the pressure of the additive to be added in this way varies that the two-sidedness in the resulting fibrous web approaches the target value.
  • a closed control loop for example the volume flow and / or the pressure of the additive to be added in this way varies that the two-sidedness in the resulting fibrous web approaches the target value.
  • the pressure also the penetration depth of the additive controllable. This leads to an optimization of the distribution of the additive in the Z direction.
  • a particularly important further thought of The invention consists in using a fine fiber suspension as an additive.
  • This can preferably be removed from the area in the beginning of the double band zone Suspension liquid, the so-called white water, can be obtained.
  • white water can be obtained.
  • the level of the fines content is important for the printability of the finished fibrous web, for example.
  • Additives are: filler suspension, polymer solution, glue or starch solution or a e.g. locally added dye.
  • the place of addition of the additive is in all cases the area of the so-called constant pressure drainage.
  • This is the area of web formation in which dewatering takes place using an essentially pulsation-free dewatering pressure.
  • the dewatering pressure either remains essentially the same or at least changes approximately continuously, for example increases.
  • Such a type of dewatering thus differs from the dewatering method mostly used in the initial area of web formation, in which pressure pulsations are generated in the suspension still present between the belts with the help of so-called forming strips. This is intended to ensure that the fiber material remains as evenly distributed as possible during the web formation process.
  • a particular advantage of the place of addition (for the additive) in the area of constant pressure drainage now consists in that after adding the additive the other Control drainage in such a way that the additive added is as possible little is lost. This is achieved, for example, by adding the additive in the initial area or in the middle of the constant pressure drainage zone, and that behind the addition point, the intensity of further drainage on the concerned Web side reduced. For example, you can drain on a certain Stop the route entirely. At the same time you can see the intensity of drainage increase on the opposite side of the web, for example by applying negative pressure and / or by having increased perforation cross sections in a certain area provides.
  • Impeding drainage on the web side to which the additive is added was possible, for example, by being in a certain sub-area the constant pressure drainage zone a closed, not perforated plate element provides or by blocking part of the perforation, for example with the help of a compressed air cushion.
  • a closed, not perforated plate element provides or by blocking part of the perforation, for example with the help of a compressed air cushion.
  • the task set, according to claim 14 can also be solved in that with the help of constant pressure drainage elements different permeability ensures that the drainage one band is more intense than the other band.
  • the latter ensures that on this side of the developing Fibrous web the fine and / or fillers introduced with the fibrous suspension cannot escape.
  • the result is a fibrous web that is on a Web side has a significantly higher proportion of fine and / or fillers.
  • FIG. 1 shows a twin wire former with an additive feed in a schematic Side view.
  • FIG. 1A shows a detail from FIG. 1.
  • FIG. 2 shows a possible modification of the additive supply device of FIG. 1 in an oblique view.
  • FIG. 3 shows a former for producing a two-layer fibrous web.
  • FIG. 4 shows a modified detail from FIG. 3.
  • FIG. 1 shows a headbox 1 (shown only as an example as a multi-layer headbox), who "shoots" a pulp suspension stream into a gusset, that is formed at the beginning of a twin-wire zone by two wire belts S1 and S2 is.
  • the two screen belts S1 and S2 run over a forming suction roll 10, which lies in the loop of the lower wire S1.
  • the top wire S2 runs from a selflite roller 9 onto the forming roller and wraps around it in the area of a forming zone FZ.
  • Forming strips can be provided in the loop of the upper sieve S2, however, in the drawing are omitted.
  • the formation of a fibrous web begins in the forming zone FZ by removing suspension liquid through the sieves.
  • the removed suspension liquid flows partly through the forming roller in a known manner 10, partly through a collecting container 27 located in the loop of the upper sieve.
  • a constant pressure dewatering zone GE In the web running direction behind the forming zone FZ, a constant pressure dewatering zone GE is provided, in which several constant pressure dewatering elements 15, 16 are arranged. These are, for example, plate segments arranged one behind the other in the web running direction and connected to one another in an articulated manner. These are perforated to allow further suspension liquid to be removed. According to FIG. 1, the perforation is essentially the same in all plate segments. Deviating from this, however, the perforation diameter and / or the number of perforations can be selected differently from segment to segment. Instead of cylindrical bores, conically widening bores can be provided. Instead of bores arranged perpendicular to the sieve plane, inclined bores can also be provided.
  • Part of the suspension liquid can also be discharged through the gap between two adjacent plate segments; see for example the gap between the plate segments 16A and 16B.
  • the clear width of the gap mentioned can be changed by moving the plate segment 16B in the direction of the double arrow shown.
  • the upper plate segments 15 and 15A are fastened to a supporting structure 8 by means of their joints.
  • the lower plate segments 16, 16A and 16B rest on pneumatic hoses 4.
  • the internal pressure in each of the pneumatic hoses 4 is individually adjustable, so that each of the plate segments can be flexibly pressed against the inside of the lower sieve S1 with a freely selectable force.
  • the plate segments 15, 16 can be heated electrically, for example, as indicated schematically at 20.
  • an oscillation generator or oscillator can be connected to the plate segments (not shown in the drawing).
  • a separating suction device 13 At the end of the twin-wire zone there is a separating suction device 13 in a known manner. This ensures that the fibrous web formed separates from the upper wire S2 and continues with the lower wire S1, from which the web is removed in a known manner and fed to further treatment stations.
  • one of the middle, upper plate segments 15 is provided with a feed device, generally designated 21, for an additive.
  • This feed device comprises a supply container 22, if necessary a pump 23, a control valve 24 and a distribution chamber 25 arranged on the plate segment 15A and associated pipelines.
  • a propellant e.g. Compressed air (preferably heated) or Add steam, u. a. to control penetration depth.
  • a propellant e.g. Compressed air (preferably heated) or Add steam, u. a. to control penetration depth.
  • Figure 1A shows a cleaning device in the form of a spray tube 19 which can be moved back and forth along the carrying device 8 is.
  • FIG. 2 shows a modified embodiment of the feed device, overall with 21A.
  • the distribution chamber 25A is divided into numerous sections across the web width divided.
  • a feed line with an individually controllable one opens into each section Control valve 24A. If again adding a propellant from a memory 26A is provided, this is also each section via an individually controllable line fed, either directly into the relevant section of the distribution chamber 25A or into the Section line downstream of the control valve 24A.
  • This allows the cross profile influence one or the other web property, e.g. the basis weight or the dryness or ash content cross profile.
  • a Fourdrinier Fourdrinier aggregate can be seen 31 with an approximately horizontally guided sieve belt 32 in accordance with the running direction Arrow 33. On the belt 32 is by means of a headbox 34 and with the help of several Drainage elements 35 formed a first fiber layer.
  • a twin-wire former designated 40 overall arranged with two sieve belts 41 and 42, which together form a twin-wire zone form. This in turn begins on a forming roller 43.
  • a headbox 44 In the upper area of this Forming roll is by means of a headbox 44 a fiber suspension flow between the Sieves 41 and 42 "shot".
  • the two sieves run together with the one in between forming fibrous web from top to bottom from the forming roller 43; embrace them then a drainage box 45, the curvature of the curvature of the Forming roll jacket is opposite.
  • a water collecting container is designated 46.
  • the fibrous web is then removed in a known manner from the wire belt 32 by means of a felt belt and a take-off roller 39 and fed to a subsequent unit (eg press section).
  • the plate-shaped drainage element 47 is fastened, for example, to a water collecting container 47a; it has partly cylindrical and partly conical widening perforations.
  • the plate-shaped drainage element 48 arranged in the loop of the other sieve belt 42 below the forming roller 43 rests - with the interposition of pneumatic hoses - on a water collecting container 48a and can thus be resiliently pressed against the inside of the sieve belt 42 with an adjustable force.
  • a feed device 51 is again provided for an additive, comprising a reservoir 52, a pump 53, a control valve 54 and one Distribution chamber 55.
  • the latter is in the initial area of the constant pressure drainage zone, thus arranged at the upper end of the plate-shaped drainage element 48. This is perforated along its entire length according to FIG. However, it is also possible that below the distribution chamber 55, the plate 48 is closed at least in some areas. This can ensure that the added additive is as extensive as possible penetrates into the forming fibrous web and remains in it.
  • a fine fiber is added as an additive. This will underside the im Twin wire former formed second fiber layer enriched with fine material.
  • the first fiber layer formed on the four-wire unit 31 has a top side relatively high fines content because the drainage only takes place downwards.
  • those sides of the two fiber layers come together on the rubber roller 50 in contact, which has an increased fines content. As a result this results in an increased splitting strength of the finished multilayer product.
  • FIG. 4 A possible modification of the construction according to FIG. 3 is shown in FIG. 4. Deviating of Figure 3 is in Figure 4 that in the loop of the belt 42 below the forming roller 43 arranged plate-shaped constant pressure drainage element 48 'as a closed Formed plate, dispensing with a feed device for an additive has been. Here takes place in the constant pressure drainage zone again on the Underside of the forming second layer of fibrous material instead of an accumulation of fine material, because here the drainage only through the perforation of the other plate-shaped drainage element 47 takes place. The result is the same or similar to that of the Embodiment according to FIG. 3.

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
EP99125356A 1999-01-28 1999-12-20 Procédé et dispositif pour la fabrication d' une bande fibreuse Expired - Lifetime EP1024224B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19903943 1999-01-28
DE19903943A DE19903943A1 (de) 1999-01-28 1999-01-28 Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn

Publications (3)

Publication Number Publication Date
EP1024224A2 true EP1024224A2 (fr) 2000-08-02
EP1024224A3 EP1024224A3 (fr) 2003-07-16
EP1024224B1 EP1024224B1 (fr) 2006-08-02

Family

ID=7896045

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99125356A Expired - Lifetime EP1024224B1 (fr) 1999-01-28 1999-12-20 Procédé et dispositif pour la fabrication d' une bande fibreuse
EP00910603A Expired - Lifetime EP1075568B1 (fr) 1999-01-28 2000-01-21 Machine et procede permettant de fabriquer une bande de tissu fibreux multicouche

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP00910603A Expired - Lifetime EP1075568B1 (fr) 1999-01-28 2000-01-21 Machine et procede permettant de fabriquer une bande de tissu fibreux multicouche

Country Status (6)

Country Link
EP (2) EP1024224B1 (fr)
AT (2) ATE335101T1 (fr)
AU (2) AU1249600A (fr)
DE (3) DE19903943A1 (fr)
NZ (1) NZ502443A (fr)
WO (1) WO2000044980A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071360A1 (fr) * 2007-12-03 2009-06-11 Voith Patent Gmbh Machine à papier et procédé pour influencer la masse d'eau par zones

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10101549A1 (de) * 2001-01-15 2002-07-18 Voith Paper Patent Gmbh Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn
DE10254301A1 (de) * 2002-11-21 2004-06-03 Voith Paper Patent Gmbh Verfahren und Siebpartie einer Maschine zur Herstellung einer mehrlagigen Faserstoffbahn
DE102008041953A1 (de) 2008-09-10 2010-03-11 Voith Patent Gmbh Blattbildungsvorrichtung und Verfahren zur Herstellung symmetrischer Blattstrukturen

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT16717B (de) * 1903-03-27 1904-06-25 George Arthur Goodson Elektrischer Zünder für Explosionskraftmaschinen.
US3846232A (en) * 1973-03-23 1974-11-05 Valmet Oy Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll
DE1942348A1 (de) * 1969-08-20 1971-03-04 Voith Gmbh J M Siebpartie einer Papiermaschine mit einem Applikator
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
EP0465698A1 (fr) * 1990-07-10 1992-01-15 Beloit Corporation Procédé et dispositif de formation d'un papier à plusieurs couches
DE19530983B4 (de) * 1995-08-23 2006-04-27 Voith Paper Patent Gmbh Vorrichtung zum Herstellen eines mehrlagigen Papiers oder Kartons
IT1291601B1 (it) * 1997-04-18 1999-01-11 Giuseppe Locati Procedimento e impianto per la produzione di carta e cartone a partire da carta da macero
DE19733316A1 (de) * 1997-08-01 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn
DE19733318A1 (de) * 1997-08-01 1999-02-04 Voith Sulzer Papiermasch Gmbh Doppelsiebformer
DE19803591A1 (de) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Doppelsieb-Former
FI103211B (fi) * 1998-02-09 1999-05-14 Valmet Corp Lisäaineen kerrostus kartonkikoneen rainanmuodostusyksiköllä

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071360A1 (fr) * 2007-12-03 2009-06-11 Voith Patent Gmbh Machine à papier et procédé pour influencer la masse d'eau par zones

Also Published As

Publication number Publication date
EP1024224B1 (fr) 2006-08-02
DE59913733D1 (de) 2006-09-14
EP1024224A3 (fr) 2003-07-16
AU1249600A (en) 2000-08-03
EP1075568B1 (fr) 2006-05-03
AU3276400A (en) 2000-08-18
ATE335101T1 (de) 2006-08-15
DE50012677D1 (de) 2006-06-08
EP1075568A1 (fr) 2001-02-14
DE19903943A1 (de) 2000-08-03
WO2000044980A1 (fr) 2000-08-03
ATE325232T1 (de) 2006-06-15
NZ502443A (en) 2000-09-29

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