WO2000077299A1 - Procede et dispositif de formation d'une bande multicouches - Google Patents

Procede et dispositif de formation d'une bande multicouches Download PDF

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Publication number
WO2000077299A1
WO2000077299A1 PCT/SE2000/001258 SE0001258W WO0077299A1 WO 2000077299 A1 WO2000077299 A1 WO 2000077299A1 SE 0001258 W SE0001258 W SE 0001258W WO 0077299 A1 WO0077299 A1 WO 0077299A1
Authority
WO
WIPO (PCT)
Prior art keywords
forming
roll
wire
rolls
ply
Prior art date
Application number
PCT/SE2000/001258
Other languages
English (en)
Inventor
Bengt NORDSTRÖM
Original Assignee
Sca Hygiene Products Ab
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 Sca Hygiene Products Ab filed Critical Sca Hygiene Products Ab
Priority to DK00944530T priority Critical patent/DK1218591T3/da
Priority to AU58615/00A priority patent/AU5861500A/en
Priority to DE60015168T priority patent/DE60015168T2/de
Priority to EP00944530A priority patent/EP1218591B1/fr
Priority to AT00944530T priority patent/ATE280270T1/de
Publication of WO2000077299A1 publication Critical patent/WO2000077299A1/fr

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Classifications

    • 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
    • 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
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • This invention concerns a method for high speed forming of a multi-ply paper or board, and a forming apparatus utilizing the method according to the invention.
  • Multi-ply forming enables the cost performance relationship of the product to be optimized by using different furnishes in different plies.
  • multi-ply technology makes it possible to increase the content of recycled paper and high yield pulps which are interesting both for cost reducing reasons and for environmental reasons.
  • Existing technology fails however to accomplish the task of high speed forming of multi-ply paper or board with superior mechanical properties as well as favourable ply coverage characteristics.
  • Multi-ply forming technology may be grouped into three main categories:
  • Separate forming is commonly carried out with a multi-fourdrinier machine. Hybrid forming or twin-wire forming (cf. e.g. DE 44 02 273 C2) may also be applied.
  • the increase in dewatering capacity given by two or more separate forming units may be utilized for increased production rates and/or lowered forming consistency for improved sheet properties. All variants of separate forming have one problem in common, however, viz. the ply bonding which generally limits the Z-direction strength of the multi-ply product. Often starch or some other bonding agent have to be sprayed on the plies before couching them together.
  • twin-wire forming would be preferable for speeds above 1000 m/min, avoiding free surface instabilities and providing higher dewatering capacity, the problem of ply- bonding then becomes worse. This is because a twin-wire-formed sheet ply has two wire sides with poor ply-bonding ability, in contrast to a fourdrinier ply which has one wire side and one top side with a better ply-bonding ability.
  • Simultaneous forming of a multi-ply product with a multi-layer head box may also be employed.
  • multi-layer head boxes are found in EP 0 681 057 N2 and in GB 2 019 465. With this method, however, the dewatering capacity is limited to that given by a single dewatering unit. Hence, this principle is not suitable for high speed forming of moderate to high grammages at low forming consistency. Hitherto, it has moreover proved difficult to accomplish acceptable ply coverage characteristics with simultaneous forming.
  • Multi-ply forming in a sequential mode has traditionally been applied in the forming of two-ply liner board using a secondary head box placed some distance downstream a fourdrinier wire with dewatering of the top ply through the primary web ply formed upstream of the secondary head box.
  • the problem of ply-bonding is essentially avoided by depositing a fibre suspension onto the pre-formed web. This means that the Z- direction strength of the multi-ply product is often determined by the Z-direction strength of the individual plies rather than by the ply-bonding.
  • Forming a top ply onto a primary web ply on a fourdrinier wire involves several disadvantages, however. It suffices to mention the drawback regarding dewatering capacity and the severe grammage variations due to the free surface occurring especially above 1000 m/min.
  • Roll forming according to Webster's method was introduced in its basic sense some four decades ago (US 3,056,719), and is well-known in the field of high speed production of single-ply paper.
  • the forming occurs between two wires running over a rotating forming roll, by introducing the fibre suspension jet into the twin- wire nip at such a velocity that the outer one of the tensioned wires is deflected while maintaining a substantially constant tension during the deflection of the outer wire by fact that the outer wire is supported by a rotating support, at least one of which one is resiliently or displaceably mounted to compensate for the deflection.
  • the dewatering pressure is determined by the tension of the outer wire divided with the instantaneous radius of curvature, and during the roll dewatering the pressure rises steeply during an initial phase, after which it levels out to a plateau.
  • a method and an apparatus for multi-ply forming are shown, where roll forming according to Webster's method is used for forming a top-ply on top of a primary base ply.
  • Roll forming according to Webster is preferably applied to form all plies including the primary web ply. Two forming and dewatering rolls are shown for each forming unit.
  • a long base wire runs through all the dewatering units, which may imply problems concerning the wire stability as several dewatering units are used.
  • each wire runs over two forming units at the most.
  • a problem with the latter configuration concerns the separation of one of the wires from the paper web and the second wire after the second roll in the forming units, where the second dewatering roll lies over the first roll. The separation herein occurs by means of the outer wire over the second roll leaves this, while the web and the inner wire continues substantially horizontally to next forming unit.
  • the separation of one of the wires from the paper web and the second wire there is in the actual dry soilds area a risk that pieces come loose from the paper web. With the actual configuration pieces of the paper web may be thrown out of the nips and due to gravity fall down on the paper web, which may lead to damages on the finished product and to paper web breakage.
  • the object of the present invention is to achieve a method for multi-ply forming of a paper or board product at high speed, implying a low investment cost with maintained high dewatering capacity and avoiding runnabihty problems referring to pieces coming loose from the paper web at the separation of one wire of the paper web and the second wire.
  • the wire winding angle should preferably be at least 120° for enabling a high dewatering capacity.
  • the wire with the incoming paper is lead to the respectively forming roll, at an angle of at least 10°, preferably at least 15° relative to the horizontal plane. In this way space for the head boxes are given for avoiding long free jet lengths.
  • the invention refers to an apparatus for forming a multi-ply paper or board product applying the method defined above.
  • Figure 1 shows schematically an example of an apparatus for forming a three-ply paper web.
  • Figure 2 schematically illustrates the sectors where the wires leave the roll.
  • Figure 3 schematically illustrates the geometry around the head box relative to the roll and incoming wire.
  • a fibre furnish which is fed out from the head box 1 is introduced into a nip created between two tensioned wires, an inner wire 2 and an outer wire 3, both of which wrap around a rotating forming roll 4.
  • the fibre suspension jet is introduced into the twin-wire nip at such a high speed that the outer wire 3 of the tensioned wires is deflected such as is described in US-A-3,056,719, the content of which should be considered be contained as a reference in the present application.
  • the tension of the outer wire 3 is maintained substantially constant during the deflection, by the fact that it is supported by a rotating support 5, being resiliently or displaceably mounted to compensate for said deflection.
  • the roll winding angle ⁇ of the outer wire 3 should be at least 110°and preferably at least 120°.
  • the diameter of the roll should be at least 1,2 m, preferably approx. 2 m.
  • the forming phase is completed during the roll dewatering. Thereafter the fibre network structure is essentially fixed so that any significant rearrangement of the fibres does not occur as the paper web passes over further dewatering elements. Further consolidation of the paper web may then be accomplished according to well-known methods such as couch rolls, suction boxes and the like, before the paper web enters the press section or another forming unit.
  • the wires 2,3 leave the roll 4 in an upper quadrant (see fig. 2), in the example shown, the upper upward quadrant E, where the paper web follows the outer wire 2.
  • the separation of the outer wire 2 with accompanying paper web from the inner wire 3 occurs by means of a suction box 6, or in another way, accomplishing that the paper web follows the outer wire after the forming roll 4.
  • the paper web here follows the outer wire 2 upwards and is later turned over a turn roll 7.
  • the second forming comprises a head box 9, a twin-wire nip formed by the wire 2, which now may constitute the inner wire, and an outer wire 10 and also a forming roll 11.
  • the forming rolls are placed alternatingly in two planes. Thereby the difference in height between the extreme points of the forming rolls are limited to preferably maximum 4-5 m.
  • a second web-ply is formed on the moist primary web-ply, which preferably has a dryness of 7-15 % by weight.
  • the head box 9 delivers a fibre suspension jet in to the twin-wire nip created by the wires 2 and 10. In this case the jet impingement also occurs at such a speed that the outer wire 10 is deflected.
  • the tension of the outer wire 10 is maintained substantially constant during the deflection, by the fact that it is supported by a rotating support 12, being resiliently or displaceably mounted to compensate for said deflection.
  • the forming occurs in an equivalent way as in the first forming unit.
  • the wires 2, 3 leave the roll 4 in a lower downward quadrant H (see fig.2), where the paper web follows the outer wire 10 downwards.
  • the separation of the outer wire 10 with accompanying paper web of the inner wire 2 occurs by means of a suction box 13, or in another way accomplishing, that the paper web follows the outer wire after the forming roll 11.
  • the paper web here follows the outer wire 10 downwards to later be lead over a turn roll 14.
  • the wires leave the roll, in this case preferably in the downward quadrant G (Fig.2) .
  • a third web-ply is formed on top of the both other formed plies.
  • the third forming unit is located on the same plane- the lower plane- as the first forming unit.
  • the head box 16 delivers a fibre suspension jet in the twin- wire nip being created by the wires 10 and 17. In this case the jet impingement also occurs at such a speed that the outer wire 17, being supported of a resiliently or displaceably support 19, is deflected.
  • the wires 10,17 leave the roll 18 in an upper quadrant E (se fig. 2), where the paper web follows the outer wire 17.
  • the separation of the outer wire 17 with accompanying paper web from the inner wire 10 occurs by means of a suction box 20, or in another way accomplishing, that the web follows the outer wire 17 after the forming roll 18.
  • the paper web follows the outer wire 17 upwards to later be lead over a turn roll 21. Possible pieces of the paper web which have come loose at the separation follow the inner wire 17, from which they are removed by a wire sprout or the like.
  • the invention is of course not limited to the embodiment shown and described, but several modifications thereof are possible within the scope of the claims.
  • the invention also comprises that one or several of the head boxes may be a multi-layer head box.

Landscapes

  • Paper (AREA)
  • Die Bonding (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Ropes Or Cables (AREA)
  • Lasers (AREA)
  • Seal Device For Vehicle (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

L'invention concerne un procédé de formation d'articles de papier ou de carton multicouches dont tous les jets sont formés au moyen de rouleaux égoutteurs, selon un procédé consistant à introduire le jet de fibres en suspension dans la ligne de contact de toile double à une vitesse telle que la toile sans fin extérieure des toiles tendues (2, 10, 17) est défléchie, tout en maintenant une tension sensiblement constante pendant la déflexion de la toile sans fin extérieure. Celle-ci a pour support un support rotatif (5, 14, 19), l'un d'entre eux au moins étant monté de manière flexible ou amovible afin de compenser ladite déflexion. La formation de chaque jet se produit sur un seul rouleau égoutteur (4, 11, 18), l'angle de renvidage (α) de la toile sur les rouleaux égoutteurs étant d'au moins 110°. Lesdits rouleaux sont situés en alternance sur deux plans. Pour le ou les rouleaux situés sur le plan supérieur, les toiles laissent le rouleau dans un quadrant inférieur (G, H) dans lequel la bande de papier suit la toile extérieure, et pour le ou les rouleaux situés sur le plan inférieur, les toiles laissent le rouleau dans un quadrant supérieur (E, F) dans lequel la bande de papier suit également la toile extérieure.
PCT/SE2000/001258 1999-06-15 2000-06-15 Procede et dispositif de formation d'une bande multicouches WO2000077299A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK00944530T DK1218591T3 (da) 2000-06-15 2000-06-15 Fremgangsmåde og indretning til dannelse af en flerlagsbane
AU58615/00A AU5861500A (en) 1999-06-15 2000-06-15 Method and device for forming a muliply web
DE60015168T DE60015168T2 (de) 1999-06-15 2000-06-15 Verfahren und vorrichtung zur herstellung einer mehrlagigen bahn
EP00944530A EP1218591B1 (fr) 1999-06-15 2000-06-15 Procede et dispositif de formation d'une bande multicouches
AT00944530T ATE280270T1 (de) 1999-06-15 2000-06-15 Verfahren und vorrichtung zur herstellung einer mehrlagigen bahn

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9902246-9 1999-06-15
SE9902246A SE514412C2 (sv) 1999-06-15 1999-06-15 Metod och anordning för formning av en fiberbana

Publications (1)

Publication Number Publication Date
WO2000077299A1 true WO2000077299A1 (fr) 2000-12-21

Family

ID=20416075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/001258 WO2000077299A1 (fr) 1999-06-15 2000-06-15 Procede et dispositif de formation d'une bande multicouches

Country Status (8)

Country Link
EP (1) EP1218591B1 (fr)
AT (1) ATE280270T1 (fr)
AU (1) AU5861500A (fr)
DE (1) DE60015168T2 (fr)
ES (1) ES2231216T3 (fr)
PT (1) PT1218591E (fr)
SE (1) SE514412C2 (fr)
WO (1) WO2000077299A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056719A (en) * 1959-07-09 1962-10-02 David R Webster Continuous web forming machine
WO1999009249A1 (fr) * 1997-08-19 1999-02-25 Sca Research Ab Procede et dispositif de realisation de nappe en plusieurs epaisseurs et produit de papier ou de carton en plusieurs epaisseurs ainsi obtenu

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056719A (en) * 1959-07-09 1962-10-02 David R Webster Continuous web forming machine
WO1999009249A1 (fr) * 1997-08-19 1999-02-25 Sca Research Ab Procede et dispositif de realisation de nappe en plusieurs epaisseurs et produit de papier ou de carton en plusieurs epaisseurs ainsi obtenu

Also Published As

Publication number Publication date
DE60015168T2 (de) 2005-11-03
PT1218591E (pt) 2005-02-28
SE514412C2 (sv) 2001-02-19
ES2231216T3 (es) 2005-05-16
DE60015168D1 (de) 2004-11-25
SE9902246D0 (sv) 1999-06-15
EP1218591A1 (fr) 2002-07-03
ATE280270T1 (de) 2004-11-15
SE9902246L (sv) 2000-12-16
AU5861500A (en) 2001-01-02
EP1218591B1 (fr) 2004-10-20

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