EP3333315B1 - Blattbildungspartie - Google Patents

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Publication number
EP3333315B1
EP3333315B1 EP16202857.5A EP16202857A EP3333315B1 EP 3333315 B1 EP3333315 B1 EP 3333315B1 EP 16202857 A EP16202857 A EP 16202857A EP 3333315 B1 EP3333315 B1 EP 3333315B1
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EP
European Patent Office
Prior art keywords
forming
roll
wire
forming section
twin
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.)
Active
Application number
EP16202857.5A
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English (en)
French (fr)
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EP3333315A1 (de
Inventor
Antti Poikolainen
Teuvo Virkkunen
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.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
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Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP16202857.5A priority Critical patent/EP3333315B1/de
Priority to CN201711255641.1A priority patent/CN108179651B/zh
Publication of EP3333315A1 publication Critical patent/EP3333315A1/de
Application granted granted Critical
Publication of EP3333315B1 publication Critical patent/EP3333315B1/de
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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

Definitions

  • the invention relates generally to producing fiber webs. Particularly the invention relates to a forming section according to the preamble of claim 1.
  • a typical production and treatment line comprises a forming section comprising a head box and a forming unit and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and sections for finishing the fiber web, for example, a size press, a calender, a coating section.
  • the production and treatment line also comprises typically at least one winder for forming customer rolls as well as a roll packaging apparatus.
  • the task of a forming unit is to remove water from fiber suspension fed by the head box.
  • water in the stock is removed on the forming section through a forming wire or forming wires for starting the formation of the web. Fibers remain on the forming wire or between the forming wires moving together.
  • different types of stocks are used.
  • the volume for which water can be removed from different stocks for achieving a web of good quality is a function of many factors, such as e.g. a function of the desired basis weight of the web, the design speed of the machine, and the desired level of fines, fibers and fill materials in the finished product.
  • a former for a fiber web machine which former is constructed as a gap forming unit, in which stock suspension from the head bow is fed into a gap formed between two wire loops, in between of which wire loops a forming gap is formed.
  • the gap forming unit comprises at least two, advantageously three rolls, which are at least partly in contact with both wires.
  • patent publication CA 1,156,080 is disclosed a forming section with two movable water pervious dewatering bands, a dewatering shoe and a dewatering cylinder arranged after the dewatering shoe and a deflection roll arranged after the dewatering cylinder.
  • twin-wire former for a paper machine having a lower wire and an upper wire.
  • the former has a twin-wire forming zone which has forming members and forming zones situated in a specific sequence as follows.
  • a downwardly curved forming zone is conformed to a sector of a large-diameter forming roll mounted on a frame of a lower wire unit, the magnitude of this sector being within the range of ⁇ 90°.
  • a second forming roll then follows which is preferably provided with a hollow face and onto which the wires arrive from the first forming roll.
  • the twin-wire forming zone is curved within a certain sector of less than 90° on the second forming roll so as to become horizontal.
  • a forming shoe is provided with a ribbed deck and fitted after the second forming roll inside the lower wire loop, this forming shoe having a relatively large curve radius after which the twin-wire forming zone ends and the web is arranged to follow along with the lower wire.
  • twin-wire formers known form prior art there is typically combined a forming roll with large wrap angle and a long pulsating forming shoe, which provides for good water removal but has high energy consumption.
  • non-pulsating water removal with the forming roll condenses the fiber web so much that there is difficulties of achieving desired water removal without powerful and long lasting pulsating water removal.
  • a forming section comprising two wire loops which form a twin-wire zone which comprises a dewatering element performing initial dewatering and a dewatering device following it.
  • the dewatering device comprises a stationary support shaft on which are supported support elements around which circles an im-permeable belt loop.
  • the dewatering device further comprises a curvilinear dewatering zone over which the wires travel supported by the belt loop. The degree of curvature of the curve of the curvilinear dewatering zone increases in the travel direction of the belt such that increasing dewatering pressure is applied to stock suspension travelling between the wires on the curvilinear dewatering zone.
  • said at least one curvilinear dewatering zone of said at least one dewatering device consists of two partial curves such that the radius of curvature of a first partial curve is greater than the radius of curvature of a second partial curve following the first partial curve in the travel direction of the web.
  • An object of the invention is to create a forming section, in which the disadvantages and problems of prior art are eliminated or at least minimized.
  • an object of the invention is to provide a new type of forming section in which height of the forming section can be decreased.
  • the forming section comprises a twin-wire forming unit formed between a lower wire and an upper wire, in which a first water removal means of the twin-wire forming unit is a forming roll with a wrap angle, wherein in the twin-wire forming unit following the forming roll there is a sleeve roll and the run between the forming roll and the sleeve roll is free of vacuumed dewatering i.e. between the forming roll and the sleeve roll no vacuumed dewatering is located.
  • the sleeve roll comprises a stationary support shaft and a belt loop, which is led to circle around the stationary support shaft, the sleeve roll further comprising at least one curvilinear dewatering zone consisting of two partial curves such that the radius of curvature of a first partial curve is greater than the radius of curvature of a second partial curve following the first partial curve in the travel direction of the belt loop.
  • the sleeve roll comprises a support elements supported at a distance from each other on the stationary support shaft, the belt loop led to circle around the stationary support shaft is supported by the support elements and the belt loop is impermeable.
  • distance between the forming roll and the sleeve roll is 0,2 - 2 meters, advantageously 0,3 - 1,5 meters, which distance is measured between the point at which the lower and upper wires wrap angle ends on the forming roll and the point at which the contact of the lower and upper wires on the sleeve roll begins.
  • the forming unit comprises first a one wire part followed by the twin-wire part and advantageously the one wire part is substantially horizontal or inclined.
  • the one wire part comprises a forming shoe with a deck and suction openings in the deck.
  • the twin-wire forming unit ends as the run of the upper wire turns away from the lower wire and the end part of the forming unit is formed as one wire part.
  • the overall height of the forming section is less than 8 meters.
  • the highest point of the sleeve roll is on a higher vertical position than the lowest point of the forming roll.
  • the overall height of the forming section can be decreased even 2 - 3 meters and thus also the frame and support structures can be dimensioned for smaller loads.
  • the overall height of the forming section is less than 8 meters.
  • the properties, especially strength properties of the fiber web are improved as the amount of pulsating water removal is minimized. Further there is less contacting water removal means in the forming section, thus the life time of wires is increased as well as the power consumption is decreased. Also good strength properties of the fiber web are achieved as there is no vacuumed, pulsating dewatering between the forming roll and sleeve roll. Further savings in investment and use costs are achieved. Short distance from the forming roll to the sleeve roll enables manufacturing of packaging board grades with high quality, efficiency and capacity.
  • figure 1 is shown schematically an advantageous example of a forming section according to the invention.
  • figure 2 is shown schematically an advantageous example of a forming section according to the invention.
  • FIG. 3A - 3B is shown very schematically a forming shoe and a sleeve roll.
  • like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples.
  • some repetitive reference signs have been omitted for clarity reasons.
  • FIG 1 is shown an example of a forming section, which is a twin-wire forming unit type forming section and begins with a twin-wire part.
  • the forming section comprises a head box 30, from which the stock suspension M is fed to the forming unit formed as a twin-wire forming unit comprising a lower wire 10 and an upper wire 20, each comprising rolls 12, 22 for guiding and driving the wire as an endless loop.
  • the stock suspension M is first fed into a gap formed between the lower wire 10 and the upper wire 20.
  • the first water removal means is a forming roll 13 with a wrap angle 13V, which forming roll 13 is located inside the loop formed by the lower wire 10.
  • the wrap angle 13V is advantageously 40-110 degrees for ensuring required water removal capacity.
  • the forming roll 13 is advantageously a suction roll.
  • the forming roll 13 is followed support foils 26 that support the lower wire 10 but do not participate in active dewatering, only remove water from the bottom surface of the wire 10 and support the run of the wires 10, 20 between the forming roll 13 and the sleeve roll 50.
  • the support foils 26 do not deviate the run of the wires 10,20 and thus no dewatering pressure is effected to the fiber web between the wires 10, 20.
  • the support foils 26 are followed by a sleeve roll 50, which is located inside the loop formed by the upper wire 20.
  • the distance L between the forming roll 13 and the sleeve roll 50 is only about 0,2 - 2 meters.
  • the distance is measured between the point in which lower and upper wires 10, 20 wrap angle 13V ends on the forming roll 13 and between the point in which lower and upper wires 10, 20 are in the contact on the sleeve roll 50 i.e. the point in which the contact of the lower and upper wires 10, 20 begins on the sleeve roll 50.
  • the support foils 26 can be also situated after the sleeve roll 50 for removing water from the surface of the wire 10.
  • the fiber web is further guided between the upper and the lower wire 20, 10 and at a distance towards the pick-up roll 31 transferring the fiber web to a press section the run of the upper wire 20 turns upwards away from the lower wire 10 and the end part of the forming unit is formed as a one wire part.
  • the further water removal means 16 may comprise forming shoes and/or suction devices. For ensuring the low height of the forming section, the highest point of sleeve roll 50 is on the higher vertical position than the lowest point of the forming roll 13.
  • FIG 2 an example of a forming section begins with a short one wire part followed by a twin-wire part.
  • the forming section comprises a head box 30, from which the stock suspension M is fed to the forming unit formed as a twin-wire forming unit comprising a lower wire 10 and an upper wire 20, each comprising rolls 12, 22 for guiding and driving the wire as an endless loop.
  • the stock suspension M is first fed onto the lower wire 10 and onto the area of a forming shoe 17 and thereafter the stock on the lower wire is guided into a gap formed between the lower wire 10 and the upper wire 20 forming the twin-wire part of the forming unit.
  • the beginning of the forming unit with a short, substantially horizontal or inclined one-wire section comprising a forming shoe 17 removing water by suction provides for exact control of the head box flow, so that water is sucked through the lower wire 10 but stock suspension is not bouncing on the wire 10 as there is no pulsating water removal.
  • the first water removal means in the twin-wire part is a forming roll 13 with a wrap angle 13V, which forming roll 13 is located inside the loop formed by the lower wire 10. Wrap angle 13V is advantageously 40-110 degrees for ensuring required water removal capacity.
  • the forming roll 13 is advantageously a suction roll.
  • the forming roll 13 is followed support foils 26 that support the lower wire 10 but do not participate in active dewatering, only remove water from the bottom surface of the wire 10 and support the run of the wires 10, 20 between the forming roll 13 and the sleeve roll 50.
  • the support foils 26 do not deviate the run of the wires 10, 20 and thus no dewatering pressure is effected to the fiber web between the wires 10, 20.
  • the distance L between the forming roll 13 and the sleeve roll 50 is only about 0,2 - 2 meters. The distance is measured between the point in which lower and upper wires 10, 20 wrap angle 13V ends on the forming roll 13 and between the point in which lower and upper wires 10, 20 are in the contact on the sleeve roll 50 i.e.
  • the fiber web is further guided between the upper and the lower wire 20, 10 and at a distance towards the pick-up roll 31 transferring the fiber web to a press section the run of the upper wire 20 turns upwards away from the lower wire 10 and the end part of the forming unit is formed as a one wire part.
  • the further water removal means 16 may comprise forming shoes and/or suction devices. This kind of forming section is especially good for forming higher basis weight webs, because forming shoe 17 reduces the web layer thickness around 20 - 40% and web doesn't tend to extrude between the wires on the forming roll 13 area.
  • the forming sections of the examples of figures 1 and 2 comprise a twin-wire forming unit with a sleeve roll, in which the twin-wire forming unit is formed between the lower wire 10 and the upper wire 20. Due to the location of the sleeve roll following next the first forming roll 13 at a distance L of 0,2 - 2 meters, advantageously 0,3 - 1,5 meters, also the location height of the upper wire 20 can lowered and thus further the location of the head box and the forming unit can be lowered.
  • FIG 3A is schematically shown a forming shoe 17, in which the deck 18 comprises suction openings 19, through which a suction effect is created to remove water from the stock suspension and the formation of the stock suspension is improved.
  • deck 18 design does not cause pulsations to the web in the beginning forming shoe 17.
  • the openings 19 are formed between foils, which foils have width of 5-15 mm located at a distance between 5-15 mm between each other and advantageously the forming shoe 17 is connected to a suction device.
  • a sleeve roll 50 with decreasing radius which comprises a stationary support shaft 51 on which support elements 52 are supported at a distance from each other, an impermeable belt loop 53 which is led to circle around the stationary support shaft 51 supported by the support elements 52.
  • the sleeve roll 50 further comprises at least one curvilinear dewatering zone K via which the wires 10, 20 are led to travel supported by the belt loop 53.
  • the degree of curvature of the curve of the curvilinear dewatering zone K increases in the travel direction of the belt 53 such that increasing dewatering pressure is applied to the stock suspension travelling between the wires 10, 20 on said at least one curvilinear dewatering zone K.
  • Radius of curvature of the curvilinear dewatering zone K consists of two partial curves such that the radius of curvature K1 of a first partial curve is greater than the radius of curvature K2 of a second partial curve following the first partial curve K1 in the travel direction of belt loop 53.
  • Radius of curvature of the curvilinear dewatering zone K can be contain several curves such that the radius of curvatures decreases in the running direction of the wires.

Claims (9)

  1. Formierpartie mit einer Doppelsieb-Formiereinheit, die zwischen einem unteren Sieb (10) und einem oberen Sieb (20) gebildet ist, wobei eine erste Wasserentfernungseinrichtung der Doppelsieb-Formiereinheit eine Formierwalze (13) mit einem Umschlingungswinkel (13V) ist, wobei in der Doppelsieb-Formiereinheit befolgend von der Formierwalze (13) eine Mantelwalze (50) vorhanden ist, die eine stationäre Tragwelle (51) und eine Bandschleife (53) aufweist, die so geführt ist, dass sie um die stationäre Tragwelle (51) zirkuliert, wobei die Mantelwalze (50) des Weiteren wenigstens eine gekrümmte Entwässerungszone (K) aufweist, die aus zwei Teilkurven besteht, so dass der Krümmungsradius (K1) einer ersten Teilkurve größer als der Krümmungsradius (K2) einer zweiten Teilkurve ist, welche der ersten Teilkurve (K1) in der Bewegungsrichtung der Bandschleife (53) folgt,
    dadurch gekennzeichnet, dass
    der Lauf zwischen der Formierwalze (13) und der Mantelwalze (50) frei von absaugender Entwässerung ist, d. h. dass zwischen der Formierwalze (13) und der Mantelwalze (50) keine absaugende Entwässerung angeordnet ist.
  2. Formierpartie nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Mantelwalze (50) Stützelemente (52) aufweist, die mit einem Abstand voneinander auf der stationären Tragwelle (51) abgestützt sind, dass die Bandschleife (53), die zum Zirkulieren um die stationäre Tragwelle (51) geführt ist, durch die Stützelemente (52) abgestützt ist, und dass die Bandschleife (53) undurchlässig ist.
  3. Formierpartie nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    der Abstand (L) zwischen der Formierwalze (13) und der Mantelwalze (50), wobei der Abstand zwischen dem Punkt, an dem der Umschlingungswinkel (13V) der unteren und oberen Siebe (10,20) auf der Formierwalze (13) endet, und dem Punkt, an dem der Kontakt der oberen und unteren Siebe (10,20) auf der Mantelwalze (50) beginnt, 0,2 - 2 Meter, vorzugsweise 0,3 - 1,5 Meter, beträgt.
  4. Formierpartie nach einem der Ansprüche 1 - 3,
    dadurch gekennzeichnet, dass
    die Formierpartie einen ersten Siebteil aufweist, dem der Doppelsieb-Teil nachfolgt.
  5. Formierpartie nach Anspruch 4,
    dadurch gekennzeichnet, dass
    der eine Siebteil im Wesentlichen horizontal oder geneigt ist.
  6. Formierpartie nach einem der Ansprüche 4 oder 5,
    dadurch gekennzeichnet, dass
    der eine Siebteil einen Formierschuh (17) mit einer Tragfläche (18) und Öffnungen (19) in der Tragfläche (18) aufweist.
  7. Formierpartie nach einem der Ansprüche 1 - 6,
    dadurch gekennzeichnet, dass
    die Doppelsieb-Formiereinheit mit einem Abstand von der Mantelwalze (50) endet, wo der Lauf des oberen Siebs (20) sich von dem unteren Sieb (10) weg bewegt und das Endteil der Formiereinheit als ein Siebteil gebildet ist.
  8. Formierpartie nach Anspruch 3,
    dadurch gekennzeichnet, dass
    die Gesamthöhe der Formierpartie weniger als 8 Meter beträgt.
  9. Formierpartie nach Anspruch 3,
    dadurch gekennzeichnet, dass
    der höchste Punkt der Mantelwalze (50) sich auf einer höheren vertikalen Position als der niedrigste Punkt der Formierwalze (13) befindet.
EP16202857.5A 2016-12-08 2016-12-08 Blattbildungspartie Active EP3333315B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16202857.5A EP3333315B1 (de) 2016-12-08 2016-12-08 Blattbildungspartie
CN201711255641.1A CN108179651B (zh) 2016-12-08 2017-12-04 成形部

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16202857.5A EP3333315B1 (de) 2016-12-08 2016-12-08 Blattbildungspartie

Publications (2)

Publication Number Publication Date
EP3333315A1 EP3333315A1 (de) 2018-06-13
EP3333315B1 true EP3333315B1 (de) 2019-05-01

Family

ID=57530557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16202857.5A Active EP3333315B1 (de) 2016-12-08 2016-12-08 Blattbildungspartie

Country Status (2)

Country Link
EP (1) EP3333315B1 (de)
CN (1) CN108179651B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3913132A1 (de) * 2020-05-20 2021-11-24 Valmet Technologies Oy Band für eine bandwalze und dessen verwendung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE410482B (sv) * 1978-02-15 1979-10-15 Karlstad Mekaniska Ab Forfarande och anordning vid en dubbelviraformare
AT379622B (de) * 1980-11-26 1986-02-10 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
FI84734C (fi) 1988-05-23 1992-01-10 Valmet Paper Machinery Inc Dubbelviraformare foer pappersmaskin.
DE19950805A1 (de) * 1999-10-21 2001-04-26 Voith Paper Patent Gmbh Former
FI20075851L (fi) * 2007-11-28 2009-05-29 Metso Paper Inc Muodostusosa
FI120880B (fi) 2008-10-24 2010-04-15 Metso Paper Inc Muodostusosa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN108179651A (zh) 2018-06-19
CN108179651B (zh) 2019-09-17
EP3333315A1 (de) 2018-06-13

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