WO1986004368A1 - Procede et dispositif de production amelioree de papier sur la section de toile d'une machine a papier fourdrinier - Google Patents

Procede et dispositif de production amelioree de papier sur la section de toile d'une machine a papier fourdrinier Download PDF

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Publication number
WO1986004368A1
WO1986004368A1 PCT/FI1986/000012 FI8600012W WO8604368A1 WO 1986004368 A1 WO1986004368 A1 WO 1986004368A1 FI 8600012 W FI8600012 W FI 8600012W WO 8604368 A1 WO8604368 A1 WO 8604368A1
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WO
WIPO (PCT)
Prior art keywords
wire
shoe
dewatering
wires
water
Prior art date
Application number
PCT/FI1986/000012
Other languages
English (en)
Inventor
Alexander Malashenko
Original Assignee
Valmet Oy
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 Valmet Oy filed Critical Valmet Oy
Publication of WO1986004368A1 publication Critical patent/WO1986004368A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • 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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the present invention concerns a procedure in the fo ⁇ ning of a paper web, in particular of newsprint of fine paper, and in dewatering the paper pulp suspension, in said procedure:
  • the fibre suspension jet being directed on a lower wire from the lip slice of the headbox
  • said fibre pulp course being conducted into a twin-wire dewatering and forming zone between said lower wire and a particular upper wire, where water is drained from the fibre pulp course both through said lower wire, in with particular, through said upper wire by the effect of dewatering elements,
  • the web being separated from said upper wire and kept supported by the lower wire, on which it is conducted onto a pick-up fabric.
  • the invention moreover concerns an Tapper wire unit ancillary equipment, intended for modernizing the Fourdrinier wire section of a paper machine, said unit comprising a frame structure and an upper wire loop guided by guide rolls mounted in support of said frame, one of them a breast roll, and by stationary shoe members, said upper wire loop cooperating with the lower wire loop belonging to said Fourdrinier wire section, on part of the length of this lower wire loop, so that the upper wire loop and the lower wire loop have a joint run in the region of which water is drained from the water-containing fibre course that has been conducted in between said wires and has been formed on the initial portion of the lower loop before said joint run, both through the upper wire in particu lar and through the lower wire, substantially by utilizing stationary shoe members, of which part have been placed inside the upper wire loop and another part inside the lower wire loop, of said shoe members those having an odd ordinal number as counted in the direction of travel of the web being placed inside the lower wire loop, respectively those with an even number being placed inside the upper wire loop.
  • the papermaking process comprises the pretreatment of the fibres before the paper machine; thereafter the partial processes taking place on the paper machine, such as web forming, compression treatment of the web and web drying; and finally web reeling and an after-treabment step.
  • the present invention is confined to the web forming process taking place on the wire section.
  • the structure and operation of a Fourdrinier wire section are known from before to a person skilled in the art and therefore no more detailed description thereof is required in this connection.
  • the papermaking process is understood to mean the dewatering process taking place on the Fourdrinier wire section and, in connection and association with the dewatering process, the web formation, that is, the positions which the fibres assume in relation to each other.
  • the object of the present invention is to achieve an improvement of the web forming process taking place on the wire section of a paper machine.
  • One of the aims is to increase the amount of draining taking place on the wire section, particularly that which is directed upward, this circumstance having the effect of improving the paper quality on the whole and, particularly, its symmetry and its printing properties.
  • the invention is meant for application in remodelling existing paper inachines. It is endeavoured to make maximal use of existing structures. It is a particular aim to retain the frame of the wire section of the old paper machine as it is.
  • One more object which is being aimed at with the aid of the present invention is to improve the so-called formation.
  • the formation is said to be poor if one can see in the paper that the fibres are unevenly built up on the surface of the paper and that they are present in the shape of a cloudy formation.
  • the formation is said to be good.
  • the formation is being acted on by directing on the pulp course that is being formed between the wires, a varying dewatering effect which shall be more closely described later on.
  • the procedure of the invention is mainly characterized in that in said twin-wire forming zone are performed the following web fon ng and dewatering operations, in sequential order as stated:-
  • a doctor member located on the leading edge of said second shoe member, or in its vicinity, is used to collect water that has been drained through the upper wire, and said water is guided, at least partially utilizing its kinetic energy, into water collecting boxes disposed inside the upper wire loop,
  • the means applying the procedure of the invention is mainly characterized in that the joint run of said upper and lower wire loops starts in the region of the first shoe member and that the line adjacent to the solid cover of the first shoe member where the upper wire and lower wire are tangent to each other has been arranged to be adjustable by raising or lowering the breast roll of the upper wire for controlling the amount of that divining which takes place by effect of the first, solid shoe member and through the upper wire;
  • the aims of the invention are achieved mainly in that upon an existing Fourdrinier wire section is mounted a so-called upper wire unit, by using which a certain part of the paper forming process will take place between two wires.
  • the web forming process taking place between two wires implies that the water escapes, from the web being formed in this region, mainly upward but also downward. Exactly, this feature causes faster dewatering, owing to which it is possible to increase the speed of the l ⁇ achine.
  • this enhancement of dewatering can be utilized in the way that on the web that is in the process of being formed is directed a comparatively mild draining pressure, whereby the fine fibres and fillers in the web will less than before escape from the web structure, compared with their depletion during fairly violent dewatering.
  • This entails a considerable improvement of the paper's printability, owing to the increased opacity caused by the fines which the paper contains.
  • shoe members are employed as structural components mainly influencing the operation of the upper wire unit, such members being placed both inside the upper wire loop and inside the Fourdrinier lower wire loop, in the twin-wire forming zone.
  • the general principle is that the changes of direction caused by the shoes in the run of the wires are minimal.
  • the gentle change of direction caused by one shoe totals about 8 to 12° at most.
  • With the shoes inside the upper wire loop is connected a water collecting means to carry off the water which is drained upward.
  • the greater part of the draining through the upper wire is effected, in the invention, in the region of the first solid-cover shoe inside the lower wire loop, the extent of this shoe's action sector being preferably adjustable by setting the position of the wire guide roll (the breast roll).
  • the breadth of the first shoe is usually about 300-500 mm.
  • the wire guide roll which guides the upper wire into the region of the first shoe is preferably adjustable as to its position, mainly vertically.
  • the coverage by the upper wire in the region of the first shoe becomes adjustable. Adjustment of this coverage may also be acccanplished by moving the shoe, most appropriately by tilting the shoe.
  • the purpose with the first shoe is to achieve a change of direction in the dewatering action taking place en the Fourdrinier wire section.
  • the shoe preferably has a smooth surface and a solid cover, and at this shoe the upper wire and lewer wire are pressed together, whereby the pressure thus generated will force the water escaping from the fibre course to go upwards, expressly through the upper wire.
  • the distance between the trailing edge of the first and the leading edge of the second shoe is preferably about 100 to 300 mm, most preferably about 150 to 200 mm. If this distance is excessively large, the result is that the water cannot sufficiently be conducted to the water collection duct and it departs downward instead.
  • Fig. 1 presents, in schematical elevational view, a Fourdrinier wire section which has been remodelled to apply the procedure of the invention.
  • Fig. 2 presents the upper wire unit of the invention, in schematical elevational view.
  • Fig. 3 presents, in schematic elevational view, another forming section conforming to the invention.
  • the Fourdrinier planar wire unit 10 to be remodelled and improved comprises a frame part, consisting of horizontal beams 23 and upright beams 24 and 25.
  • the planar wire loop 11 passes, starting at the breast roll 12, in the horizontal plane on its run T-T, where inside the wire loop has been provided an assembly of dewatering equipment known in itself in the art, comprising the breast table 13', the planar suction boxes 13,15 and 17, and the foils 14,18.
  • the web W is detached from the wire 11 and transferred onto the pick-up felt 21 by effect of the suction zone 22a of the pick-up roll 22.
  • the return run of the wire 11 is guided by the guide rolls 16.
  • the changes are restricting to removing in the central region of the planar wire section 10, for instance, three consecutive planar suction boxes and mounting in their place, in the direction of travel of the wire 11, first a forming shoe 41 with smooth surface and solid cover and having a comparatively large radius of curvataire R 1 and, an the trailing side, a forming shoe provided with a lath cover 36, its cover having a large radius of cairvature R 5 and its interior volume connected to a source of suction, or vacuum, (-P).
  • Halfway between said shoes 41 and 45 with curved surface (R 1 ,R 5 ), inside the loop of the wire 11, is disposed a narrower shoe 43, which may resemble a foil.
  • the guiding top surface of the centremost shoe 43 preferably lies at a small distance H, below the tangent plane of the shoes 41 and 45.
  • the wire loop 31 of the upper wire unit 30 is guided by the guide rolls 32,33 and 34.
  • the latter of the guide rolls 34 at least, is provided with a drive 35.
  • the guide rolls 32,33 and 34 are provided with doctor blades 37 in a manner known in itself in the art.
  • a dewatering box 40 Inside the loop 31 of the tipper wire has been disposed, as a compact unit, a dewatering box 40 an the lower side of which have been integrated narrow, lath-like shoes 42 and 44 guiding the run of the twin-wire forming zone and which come to lie substantially halfway between the corresponding dewatering elements 41,43 and 45 of the lower wire unit.
  • the distances L 1 ,L 2 ,L 3 and L 4 between the shoes 41,42,43,44 and 45 operating in the twin-wire forming zone, which are added in connection with remodelling, are preferably all substantially equal.
  • the radii of curvature R 1 ,R 2 ,R 3 and R 4 are usually in the range from 2000 to 4000 mm, preferably about 3000 mm.
  • One of the most important modes of action of the invention is that the direction of the draining taking place on the initial, singlewire part through the wire 11 is inverted, that is, changed into dewatering going upwards through the wire 31.
  • the first shoe 41 has a solid cover, whereby the water is forced to depart in the direction of the arrows F 2 , through the upper wire.
  • the dewatering taking place in the region of the first shoe 41 accounts for the major part, for instance about 90%, of the dewatering taking place an the twin-wire portion.
  • the dewatering in the region of the first shoe 41, through the upper wire 31, is highly significant in view of the overall functioning of the forming section. It is therefore appropriate to make this contribution to the dewatering action such that it can be regulated.
  • the guide roll 32 of the upper wire 31 has been made adjustable in the direction of the arrow S, mainly in the vertical plane, so that the joint coverage angle a of the twin-wire portion and the shoe 41 is changed.
  • the first shoe 41 may also be arranged to be tiltable, that is to be turnable about its longitudinal axis, or even to be movable horizontally and/or vertically.
  • a design solution has already been worked cut for the apparatus required in this connection, in the same Applicant's Finnish Patent No. 62873 (equivalent to U.S. Patent No. 4,416,731).
  • the course of the twin-wire part begins on the solid-cover forming shoe 41, the tangential plane on its leading edge 41' being the original plane T-T of the planar wire.
  • the twin-wire zone curves downwards, guided by the shoe 42, whereafter it curves upwards again, guided by the narrow shoe 43 located inside the lower wire unit 10.
  • the course of the wires 11,31 curves downward, guided by the narrow shoe 44 of the upper wire unit 30, ending up in the original plane T-T, guided by the shoe 45 with lath cover 46.
  • the shoes 42,43 and 44 are rather narrow in the direction in which the wires proceed, the twin-wire part on the whole becomes smoothly, substantially sinusoidally undulating, owing to the dynamic forces.
  • the tensions T 1 and T 4 42 are preferably in the range 5 to 8 kN/m and the radii of curvature R 1 ,R 2 ,R 3 and R 4 , in the order of 3000 mm.
  • Fig. 3 is presented an alternative embodiment of the invention, appropriate e.g. for use with comparatively thin brands of paper.
  • the einbodiment of Fig. 3 differs from that of Fig. 1, first, in that its upper wire unit 30 has been placed rather close to the headbox 25. Therefore, the single-wire initial part 10a constituted by the lower wire 11 will be comparatively short, so that in its region there are only two breast tables 13" or equivalent, over one of them already being located the breast roll 32 of the upper wire 31, this breast roll being adjustable in the vertical direction S.
  • Fig. 3 is presented an alternative embodiment of the invention, appropriate e.g. for use with comparatively thin brands of paper.
  • the einbodiment of Fig. 3 differs from that of Fig. 1, first, in that its upper wire unit 30 has been placed rather close to the headbox 25. Therefore, the single-wire initial part 10a constituted by the lower wire 11 will be comparatively short, so that in its region there are only two breast tables 13" or equivalent, over one of them already being located
  • a comparatively wide first, solid-cover shoe 41 which accomplishes the remarkably high amount of dewatering in the direction of the arrow F 1 through the upper wire 31 and into the box 40'. Since on the relatively short single-wire initial part 10a rather much water has still been left undrained, the proportion of dewatering taking place in the region of the shoe 41 is higher than mentioned above.
  • a second shoe 42 substantially narrower than the first shoe 41, which is lath-like and causes a "dip" in the course of the wires 11 and 31.
  • the suction boxes 46 in the region of which the joint run of the wires 11 and 31 returns quite gently to the plane T-T of the upper wire and which further complete the dewatering action.
  • the tipper wire 31 separates from the lower wire.
  • the planar suction box 17' makes sure that the web W follows along with the lower wire 11.
  • the structure and operation of the forming section de picted in Fig. 3 are mainly similar to those described before in connection with Figs 1 and 2.
  • the planar suction boxes 46' are largely equivalent to the forming shoe 45 with lath cover, presented in Figs 1 and 2.
  • the operation of the planar wire part 10 is normal on the single-wire initial portion 11a.
  • the headbox 25 supplies the fibre suspension jet J onto the planar wire part at the wire table 13', in the region of this table and thereafter water being drained from the web mainly by gravity action only and assisted by the dewatering equipment 13,14,15.
  • the tipper wire unit 30 and the twin-wire forming zone defined by it have been so placed that on the start line K 1 of the twin-wire part the dry matter content of the fibre course W 0 that has been formed is in the order 1 to 1.5%.
  • the dry matter content of the fibre course is substantially higher than this value when thefibre course arrives in the sphere of action of the upper wire unit 30, the aims of the present invention cannot be achieved, not in all parts at least. Above all, this concerns the effect of the upper wire unit 30 on the symmetry and formation of the web that is being formed.
  • the leading edge of the shoe 41 drains water minimally in the direction of the arrow F 1 by doctor action.
  • water escapes in remarkable quantity in the direction of the arrow F 2 , primarily owing to the tension pressure P 1 from the upper wire 31, and assisted by centrifugal force.
  • the waters departing through the tipper wire in the direction of the arrow F 1 are conducted, partly by effect of the water's kinetic energy (auto-slice effect) and partly by effect of the vacuum (-P) in the water collection box 40, through the passage 46 in the direction of the arrow V into the box 40, and thence further to one side of the paper machine.
  • the tension pressure P 2 between the wires 11,31 is primarily determined by the tension T 1 of the planar wire 11, whereby dewatering mainly takes place in the direction of the arrow F 3 .
  • the leading edges of the shoes 42,43 and 44 may also have a doctor effect, which drains water to sane extent.
  • the tension pressure between the wires 11 and 31 is determined by the tension T 2 of the upper wire 31, causing dewatering in the direction of the arrow F 4 , this being promoted by the doctor effect of the leading edge of the last foil 44.
  • the waters thus escaping are transported by kinetic energy and by vacuum effect (-P) through the passage 47 and by mediation of the box 40 to one side of the wire section.
  • the tension pressure is determined by the tension T 1 of the lower wire 11 and in the region of the shoe 45, by the tension T 2 of the upper between the laths 46 of the shoe 45 drains water and, above all, makes sure that the web W follows along with the planar wire 11 as the tipper wire 31 separates therefrom.
  • the tipper wire unit 30 has been placed in the central region of the length L o of the planar wire.
  • the length L of the twin-wire part, relative to the total length L o of the planar wire depends on many different factors, for instance en whether the purpose of remodelling is mainly to increase the speed of the forming section or mainly to improve the web formation, i.e., to influence the quality characteristics of the paper.
  • the proportion of the length L in relation to the length L o is in the range 25 to 40 %, preferably in the range 30-35 %.
  • the dewatering cxaitributions about 85 to 95% of the total dewatering take place on the single-wire initial portion 11a, preferably about 90%.
  • the dewatering taking place in the twin-wire dewatering zone K 1 -K 2 is most properly distributed so that the contribution to the total dewatering on the twin-wire part of the dewatering in the direction of the arrow F 2 through the upper wire is very high, about 80 to 95%, preferably about 90 %.
  • the contribution of the dewatering in the direction of the arrow F 3 through the lcwer wire is 5% and that of the dewatering in the direction of the arrow F 4 , relative to the dewatering taking place in the region L, is in the order of 10 %, the rest being distributed among the other contributions.
  • Figs 2 and 3 differ in the respect that in Fig. 2 there are two waves in the twin-wire dewatering zone, produced under guidance by the shoes 41,42,43,44 and 45, the first such wave having the length L 1 + L 2 and the second wave having the length L 3 + L 4 . There is only one "wave" in Fig. 3, its length being mainly determined by the shoes 41 and 42.
  • the run of the twin-wire zone deviates somewhat from a sinusoidal wave, in the first place because in the embodiment of Figs 1 and 2 the first and last shoes, 41 and 45, are substantially wider than the second, third and fourth shoes 42,43 and 44.
  • said undulating twinwire forming zone is below the base level T-T of the lower wire in its entirety, preferably even so that the guiding surface of the narrow central shoe 43 lies a small distance H 1 below the plane T-T.

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  • Paper (AREA)

Abstract

Procédé de formation d'une bande de papier et de drainage de la suspension de pulpe de papier. Un jet (J) de la suspension de pulpe est appliqué sur une toile inférieure (11), l'eau s'écoule à travers la toile inférieure (11), le trajet (Wo) de la pulpe fibreuse mène à une zone de drainage et de formation (L) où l'eau s'écoule à travers les toiles (11, 31) et la bande (W) est amenée sur une bande de transport (21). Dans la zone de formage, la course commune des toiles (11, 31) est déviée, un effet de drainage est provoqué de sorte que l'eau s'échappe du trajet (Wo) de la pulpe uniquement à travers la toile supérieure (31), la course des toiles (11, 31) est déviée en direction opposée, l'eau qui s'est écoulée à travers la toile supérieure (31) est recueillie et guidée vers un dispositif (40, 46) de collecte de l'eau, et la course de la partie à deux toiles est déviée encore une fois en direction opposée. Le trajet commun des toiles (11, 31) et de la pulpe suit un parcours sinusoïdal depuis la partie initiale (11a) à une seule toile. Le rapport entre la longueur lambda de cettte onde et l'amplitude H de l'onde se situe dans la plage lambda/H = 12 sur 20. Une unité (30) de toile supérieure, avec son équipement auxiliaire (41, 43, 45) sert à modifier la section de la toile d'une machine à papier Fourdrinier.
PCT/FI1986/000012 1985-01-28 1986-01-27 Procede et dispositif de production amelioree de papier sur la section de toile d'une machine a papier fourdrinier WO1986004368A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI850364A FI82084C (fi) 1985-01-28 1985-01-28 Oevre viraenhet.
FI850364 1985-01-28

Publications (1)

Publication Number Publication Date
WO1986004368A1 true WO1986004368A1 (fr) 1986-07-31

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ID=8520273

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Application Number Title Priority Date Filing Date
PCT/FI1986/000012 WO1986004368A1 (fr) 1985-01-28 1986-01-27 Procede et dispositif de production amelioree de papier sur la section de toile d'une machine a papier fourdrinier

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Country Link
DE (1) DE3690026T1 (fr)
FI (1) FI82084C (fr)
GB (1) GB2180273B (fr)
SE (1) SE452997B (fr)
WO (1) WO1986004368A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287276A2 (fr) * 1987-04-17 1988-10-19 The Black Clawson Company Machine à double toile horizontale
EP0296135A2 (fr) * 1987-06-18 1988-12-21 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile
DE3815316A1 (de) * 1988-05-05 1989-11-16 Escher Wyss Gmbh Vorrichtung zur entwaesserung an einem doppelsieb-former
WO1990005210A1 (fr) * 1988-10-31 1990-05-17 Beloit Corporation Appareil de formation
EP0438685A1 (fr) * 1990-01-26 1991-07-31 Sulzer-Escher Wyss Gmbh Former dans une machine à papier
EP0438681A1 (fr) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Dispositif de déshydratation pour une section de formage à deux toiles
WO1992014880A1 (fr) * 1991-02-25 1992-09-03 Ab Nordiska Egoutteurfabriken Dispositif de treillis superieur
US5389206A (en) * 1989-08-22 1995-02-14 J. M. Voith Gmbh Twin wire former
WO1995027823A1 (fr) * 1994-04-12 1995-10-19 Jwi Ltd. Formation amelioree dans une machine a papier a deux tissus
WO2000077298A1 (fr) * 1999-06-14 2000-12-21 Metso Paper, Inc. Procede permettant d'eliminer l'eau de la partie toile d'un sechoir de pulpe et d'un unite d'essorage
CN110735351A (zh) * 2019-11-21 2020-01-31 中冶美利云产业投资股份有限公司 一种配有顶网成型器的长网造纸机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3306717A1 (de) * 1982-03-02 1983-09-08 Valmet Oy, 00130 Helsinki Bahnbildungspartie zur modernisierung der langsiebpartie einer papiermaschine
DE3315023A1 (de) * 1982-04-30 1983-11-10 Valmet Oy, 00130 Helsinki Formschuh fuer den former einer papiermaschine
US4472244A (en) * 1981-02-10 1984-09-18 Valmet Oy Wire section in a paper machine
GB2143871A (en) * 1983-07-23 1985-02-20 Beloit Walmsley Ltd Twin wire paper forming machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472244A (en) * 1981-02-10 1984-09-18 Valmet Oy Wire section in a paper machine
DE3306717A1 (de) * 1982-03-02 1983-09-08 Valmet Oy, 00130 Helsinki Bahnbildungspartie zur modernisierung der langsiebpartie einer papiermaschine
DE3315023A1 (de) * 1982-04-30 1983-11-10 Valmet Oy, 00130 Helsinki Formschuh fuer den former einer papiermaschine
GB2143871A (en) * 1983-07-23 1985-02-20 Beloit Walmsley Ltd Twin wire paper forming machine

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287276A2 (fr) * 1987-04-17 1988-10-19 The Black Clawson Company Machine à double toile horizontale
EP0287276A3 (en) * 1987-04-17 1990-01-31 The Black Clawson Company Horizontal twin wire machine
EP0296135A2 (fr) * 1987-06-18 1988-12-21 Valmet Paper Machinery Inc. Section de formage d'une machine à papier à double toile
EP0296135A3 (en) * 1987-06-18 1989-03-08 Valmet Paper Machinery Inc. Hydrid former for a paper machine
US4917766A (en) * 1987-06-18 1990-04-17 Valmet Paper Machinery Inc. Hybrid former for a paper machine
DE3815316A1 (de) * 1988-05-05 1989-11-16 Escher Wyss Gmbh Vorrichtung zur entwaesserung an einem doppelsieb-former
WO1990005210A1 (fr) * 1988-10-31 1990-05-17 Beloit Corporation Appareil de formation
US5500091A (en) * 1989-08-22 1996-03-19 J. M. Voith Gmbh Twin-wire former
US5389206A (en) * 1989-08-22 1995-02-14 J. M. Voith Gmbh Twin wire former
US5718805A (en) * 1989-08-22 1998-02-17 J. M. Voith Gmbh Twin wire former
US5853544A (en) * 1989-08-22 1998-12-29 J.M. Voith Gmbh Twin wire former
EP0438681A1 (fr) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Dispositif de déshydratation pour une section de formage à deux toiles
EP0438685A1 (fr) * 1990-01-26 1991-07-31 Sulzer-Escher Wyss Gmbh Former dans une machine à papier
WO1992014880A1 (fr) * 1991-02-25 1992-09-03 Ab Nordiska Egoutteurfabriken Dispositif de treillis superieur
WO1995027823A1 (fr) * 1994-04-12 1995-10-19 Jwi Ltd. Formation amelioree dans une machine a papier a deux tissus
WO2000077298A1 (fr) * 1999-06-14 2000-12-21 Metso Paper, Inc. Procede permettant d'eliminer l'eau de la partie toile d'un sechoir de pulpe et d'un unite d'essorage
CN110735351A (zh) * 2019-11-21 2020-01-31 中冶美利云产业投资股份有限公司 一种配有顶网成型器的长网造纸机

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Publication number Publication date
GB2180273A (en) 1987-03-25
DE3690026T1 (fr) 1987-01-29
GB8622953D0 (en) 1986-10-29
SE8604035L (sv) 1986-09-24
FI82084C (fi) 1991-01-10
FI82084B (fi) 1990-09-28
SE452997B (sv) 1988-01-04
FI850364A0 (fi) 1985-01-28
SE8604035D0 (sv) 1986-09-24
FI850364L (fi) 1986-07-29
GB2180273B (en) 1988-06-22

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