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WO1993025753A1 - Support de forme rotatif pour la fabrication du papier - Google Patents

Support de forme rotatif pour la fabrication du papier Download PDF

Info

Publication number
WO1993025753A1
WO1993025753A1 PCT/GB1993/001269 GB9301269W WO9325753A1 WO 1993025753 A1 WO1993025753 A1 WO 1993025753A1 GB 9301269 W GB9301269 W GB 9301269W WO 9325753 A1 WO9325753 A1 WO 9325753A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
forming band
felt
making felt
making
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.)
Ceased
Application number
PCT/GB1993/001269
Other languages
English (en)
Inventor
Brian William Attwood
Kenneth William Hamilton Loy
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.)
BLACK CLAWSON INTERNATIONAL Ltd
Original Assignee
BLACK CLAWSON INTERNATIONAL Ltd
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 BLACK CLAWSON INTERNATIONAL Ltd filed Critical BLACK CLAWSON INTERNATIONAL Ltd
Publication of WO1993025753A1 publication Critical patent/WO1993025753A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D21F9/04—Complete machines for making continuous webs of paper of the cylinder type
    • D21F9/046—Complete machines for making continuous webs of paper of the cylinder type with non-immersed cylinder
    • 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 present invention relates to the manufacture of paper and paperboard and, more particularly, to the manu ⁇ facture of paper and paperboard by means of a rotary for ⁇ mer.
  • rotary formers consist of a cylinder mould which has a permeable construction comprising a base structure upon which is fitted a coarse mesh backing wire or fabric covered with a finer mesh facing or forming wire.
  • a flow system for supplying paper-making stock in the form of a fibrous suspension to the surface of the mould where drainage and accompanying web formation take place.
  • Typical fibrous suspension supply arrangements are either of the restricted flow type or of the pressure forming type, as described in UK Patent Specification No. 1548925.
  • the fibrous suspension is drained or dewatered through the cylinder mould under pressure, thus forming a fragile fibrous mat or web, and the drainage water associated with this action passes through the structures of the wire and the cylinder mould into the centre of the cylinder mould.
  • the fibrous web on the surface of the cylinder mould is transferred to a making felt with an associated couch roll.
  • the couch roll applies a nip load through the cylinder mould, and further water associated with the fibrous web is squeezed out of the web into the forming wire, backing wire and cylinder mould structure.
  • the web is arranged to adhere to the underside of the making felt (known as an under felt arrangement) and may be carried on the felt to further rotary forming units and finally to the press stage and drier section of the complete paper-making machine.
  • an under felt arrangement the underside of the making felt
  • this vacuum is to hold the drainage water, now associated with the forming and backing wires and the roll structure, to the mould so that, when it is thrown out by the action of centrifugal force, it does not interfere with the fragile fibrous web on the underside of the making felt.
  • the cylinder mould is often in the form of an expensive suction roll with associated vacuum application and related energy costs.
  • the present invention consists in a rotary former for manufacturing paper or paperboard, in which the cylinder mould is fitted with an endless foraminous forming band on which paper-making stock is deposited to form a web, and in which the web is transferred from the forming band to a making felt and the forming band is guided in a loop having a run travelling adjacent the making felt for a predetermined distance downstream of the web transfer position.
  • the web of paper making stock formed on the forming band as it passes about the cylinder mould comes into contact with the making felt at the web transfer position and is held against the making felt for a period of time by the run of the forming band travelling adjacent the making felt. Whilst in this position the fragile web between the forming band and making felt is protected from any throw out water from the cylinder mould. At the same time the web may be further dewatered and formed/reformed by suitable means disposed above and/or under the making felt or forming band.
  • the web may be transferred to the making felt at a pressure nip through which the forming band and making felt travel with the web sandwiched therebetween and which squeezes the web and produces further dewatering of the web.
  • the pressure nip may be formed between the cylinder mould and a couch roll.
  • the forming band has a run travelling generally parallel to the making felt for a predetermined distance downstream of the transfer position or pressure nip and the web may be sandwiched between the making felt and the forming band throughout this ru .
  • Skimming or doctor means may be disposed within the loop of the forming band adjacent the upstream end of the run and serve to remove water from the inside of the forming band.
  • This skimming or doctor means preferably comprises one or more deflector blades positioned close to the forming band and an associated splash guard extending adjacent the cylinder mould. The splash guard serves further to protect the web from throw-out water from the cylinder mould.
  • the forming of the web may be controlled by varying the number of deflector blades and by adjusting the application pressure of the deflector blade(s) against the forming band.
  • the loop c.t the farming band is conveniently sup ⁇ ported by guide and tensioning means, such as, a support roller at the downstream end of the loop and tensioning roller acting on the return run of the forming band between the support roller and the cylinder mould.
  • the support roller may be a hollow roller, for example of the extractor type, to produce further dewatering of the web.
  • Suction means such as a suction box, may be disposed downstream of the transfer position or pressure nip for applying suction to the web through the making felt to assist in dewatering and transfer of the web to the felt.
  • the invention is particularly suitable for use in an under felt arrangement in which the cylinder mould is disposed below the making felt, and the web is transferred to the underside of the making felt for feeding to subse ⁇ quent stages of the paper making machinery.
  • the present invention also consists in a method of manufacturing paper or paperboard in which a web is formed from paper making stock deposited on an endless foraminous forming band fitted about a cylinder former and is transferred from the cylinder former to a making felt at a transfer position, and in which the forming band is guided in a loop having a run travelling adjacent the making felt for a predetermined distance downstream of the transfer position and protecting the web transferred to the felt from throw-out water from the cylinder former.
  • the invention enables the production of a web of papermaking stock at higher speeds and higher basis weights than hitherto.
  • a good quality product can be manufactured at speeds as high as 400 m/min and a single former can produce such a product with a basis weight of 200 g/m 2 .
  • the higher basis weight achievable with the invention enables a multi-ply paper or paperboard of a predetermined bulk to be produced with a reduced number of formers than would have been required hitherto.
  • Figure 1 is a side view of a rotary former accord ⁇ ing to one embodiment of the invention
  • Figure 2 is a side view of a rotary former accord ⁇ ing to another embodiment of the invention.
  • the rotary former comprises a rotatable cylinder mould 1 having a cylindrical base structure 2 with a coarse mesh foraminous backing fabric 3, such as a backing wire, fitted about he circumference of the base structure 2.
  • the cylinder mould 1 is further fitted with an endless foraminous forming band 4 of a finer mesh fabric, such as a fine wire mesh.
  • An aqueous paper making stock comprising fibrous cellulosic material is deposited on the forming band 4 by a pressure former 5 and forms a fibrous web 6 by drainage into the cylinder mould 1.
  • a making felt 7 travels in a path generally tangen ⁇ tial to the cylinder mould 1 downstream of the pressure former 5.
  • a couch roll 8 cooperates with the cylinder mould 1 to form a pressure nip 9 therewith through which the making felt 7 and the forming band 4 travel.
  • the pressure nip 9 defines a transfer position at which the web 6 is transferred from the forming band 4 to the making felt 7.
  • the forming band 4 is guided in a loop and has a run 10 travelling adjacent the making felt 7 for a prede ⁇ termined distance downstream of the pressure nip 9. At the downstream end of the run 10, the loop turns about a sup ⁇ port roller 12.
  • a tensioning roller 13 abuts the return run of the forming band between the support roller 10 and the cylinder mould and is movable (as indicated by arrows in the figure) to maintain a suitable tension in the loop.
  • a suction box 11 is disposed close to the making felt 7 for applying suction to the web 6 therethrough, to assist in dewatering and transfer of the web to the felt 7.
  • a skimming or doctor deflector 14 is disposed closely against the forming band 4 adjacent the upstream end of the run 10, for removing water from the inside of the forming band .
  • the deflector 14 has an associated collecting tray and a splash guard 15 extending adjacent the circumference of the cylin ⁇ der mould 1 for protecting the sandwiched web from splash ⁇ es.
  • a cleaning shower 16 is disposed adjacent the circumference of the cylinder mould 1 upstream of the pressure former 5 for cleaning the forming band 4, the backing wire 3 and the base structure 2 of the cylinder mould.
  • the web 6 In operation of the rotary former, the web 6 is dewatered by drainage through the cylinder mould 1, assisted by squeezing at the pressure nip 9, as in normal rotary operation of a typical rotary former. But down ⁇ stream of the nip 9, the web 6 remains sandwiched between the under side of the making felt 7 and the upper side of the forming band 4.
  • doctor deflector 14 The action of the doctor deflector 14 is to remove any water hanging on the under side of the forming band 4, and protect the band 4 and the fibrous web 6 from being wetted by water thrown out from the cylinder mould 1. In some cases a reforming or improving of the web structure may be associated with the use of the deflector 14. Any water remaining in the structure of the forming band 4 downstream of the deflector 14 will not cause unsightly watermarks or damage to the fibrous web 6.
  • the rotary former shown in Figure 2 has a similar structure to that of Figure 1, and like reference numerals are used in the two figures to indicate like parts.
  • further dewatering of the web is facili ⁇ tated by a second couch roll 18 forming a pressure nip 19 with the support roll, which is in the form of a hollow extractor roll 20.
  • the fragile fibrous web is thus protected from the effects of damage from extraneous fluid following the forming section, so that higher speeds of manufacture are possible than those attainable with the traditional under felt rotary former type machine. For example, it is possi ⁇ ble to operate at speeds in excess of 300 m/min.
  • the equipment described can be associated either with completely new formers or may be added to existing equipment. It may also be used for the production of multi- ply paper and paperboard, in which one or more rotary formers, such as shown in Figure 1 or 2, are arranged successively to apply one or more additional web plies to a previously formed web carried on the underside of the making felt 7.
  • a suction box 11 may alternatively or in addition be positioned underneath the run 10 for assisting in dewater ⁇ ing of the web.

Landscapes

  • Paper (AREA)

Abstract

L'invention se rapporte à un support de forme rotatif destiné à la fabrication du papier ou du carton et qui comporte un moule cylindrique (1) sur lequel est monté un ruban de formation sans fin poreux (4) sur lequel une pâte à faire le papier est déposée pour former une bande (6). Cette bande (6) est tranférée du ruban de formation (4) au feutre de fabrication (7), et le ruban de formation est guidé de façon à décrire une boucle ayant un parcours (10) adjacent au feutre de fabrication sur une distance prédéterminée, en aval de la position de transfert (9) de la bande.
PCT/GB1993/001269 1992-06-18 1993-06-15 Support de forme rotatif pour la fabrication du papier Ceased WO1993025753A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9212909.7 1992-06-18
GB929212909A GB9212909D0 (en) 1992-06-18 1992-06-18 Rotary former for manufacturing paper

Publications (1)

Publication Number Publication Date
WO1993025753A1 true WO1993025753A1 (fr) 1993-12-23

Family

ID=10717296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001269 Ceased WO1993025753A1 (fr) 1992-06-18 1993-06-15 Support de forme rotatif pour la fabrication du papier

Country Status (2)

Country Link
GB (1) GB9212909D0 (fr)
WO (1) WO1993025753A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5766420A (en) * 1994-05-02 1998-06-16 Smurfut Carton Y Papel De Mexico Under felt inclined flat former to produce multilayer or monolayer sheet of paper
US5820735A (en) * 1994-05-02 1998-10-13 Smurfit Carton Y Papel De Mexico Under felt inclined flat former to produce multilayer or monolayer sheet of paper

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2215130A1 (de) * 1971-06-21 1973-01-11 Mitsuoki Iron Works Co Rundsiebmaschine zur papierherstellung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2215130A1 (de) * 1971-06-21 1973-01-11 Mitsuoki Iron Works Co Rundsiebmaschine zur papierherstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5766420A (en) * 1994-05-02 1998-06-16 Smurfut Carton Y Papel De Mexico Under felt inclined flat former to produce multilayer or monolayer sheet of paper
US5820735A (en) * 1994-05-02 1998-10-13 Smurfit Carton Y Papel De Mexico Under felt inclined flat former to produce multilayer or monolayer sheet of paper

Also Published As

Publication number Publication date
GB9212909D0 (en) 1992-07-29

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