EP3382094B1 - Blattbildungspartie zur herstellung einer mehrlagigen faserstoffbahn und verfahren zur herstellung einer mehrlagigen faserstoffbahn - Google Patents

Blattbildungspartie zur herstellung einer mehrlagigen faserstoffbahn und verfahren zur herstellung einer mehrlagigen faserstoffbahn Download PDF

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Publication number
EP3382094B1
EP3382094B1 EP17164069.1A EP17164069A EP3382094B1 EP 3382094 B1 EP3382094 B1 EP 3382094B1 EP 17164069 A EP17164069 A EP 17164069A EP 3382094 B1 EP3382094 B1 EP 3382094B1
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EP
European Patent Office
Prior art keywords
wire
fiber web
forming
roll
web
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EP17164069.1A
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English (en)
French (fr)
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EP3382094A1 (de
Inventor
Antti Poikolainen
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Valmet Technologies Oy
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Valmet Technologies Oy
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Priority to EP17164069.1A priority Critical patent/EP3382094B1/de
Priority to CN201810254313.8A priority patent/CN108691235B/zh
Publication of EP3382094A1 publication Critical patent/EP3382094A1/de
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    • 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
    • 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

Definitions

  • the invention relates generally to producing multi-ply fiber webs. Particularly the invention relates to a forming section according to the preamble of the independent forming section claim and to a method for forming a multi-ply fiberweb according to the preamble of the independent method claim.
  • a typical production and treatment line comprises a forming section comprising a headbox 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 headbox.
  • 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 commonly used method of making a multi-ply fiber web is based on the use of several separate web forming units in which the different layers of the web are caused to be drained in a layer by layer fashion either onto one another or onto separate wires, in which case they are combined with one another after partial dewatering.
  • multi-ply / multilayer fiber web production i.e. when producing a fiber web having more than one layers term 'multi-ply_is used when the layers are formed separately in the forming section and term 'multilayer_is used when a multilayer headbox is used for feeding suspension layers to the forming section even though these terms multi-ply /multilayer are used very often synonymously and thus the difference can be defined by the context only.
  • WO9205310A1 an apparatus for manufacturing multi-ply web in a paper or cardboard machine comprising a first wire provided for transporting a first web and a second wire, which is provided for transporting a second web, which apparatus comprises a reversing roll, at which the second wire is provided for travelling round the reversing roll for being set on top of the first wire for bringing the webs together to form the joined layers of a multi-ply web, and in the apparatus a member having a press surface, preferably an additional roll, is situated on the side of the first wire against the reversing roll, the rolls being so mounted that a press nip is formed, the apparatus further comprising means for loading said members with a desired force againsteach other for effecting a suitable line pressure influencing the bond between the webs, the members and wires having such constructions that the nip causes the movement of the water in the web layers and the movement of the fine substances therewith at the interface of the web layers towards one of the members.
  • the window of adjusting the consistency of the layers is very narrow, as too low consistency may cause web breaks and too high consistency leads to low joining forces (ply bond) between the layers and thus the joining of the layers of the multi-ply fiber web may be incomplete.
  • One disadvantage often in arrangements known from the prior art is that due to the need of high enough joining forces leads to joining the layers in low consistency, which then leads to high energy consumption of water removal from the multi-ply fiber web with layers combined as the drainage resistance is in relation higher than from the layers separately treated. This is problem especially in hybrid or gap forming sections which flushes fines from the surface of the combined layers and this reduces multi-ply web ply bond.
  • adherence substances such as starch
  • starch may cause disadvantages to the surface properties of the fiber web, especially in cases where the starch may drop unwantedly onto the fiber web.
  • starch addition requires corresponding equipment and typically also more cleaning of the surrounding equipment is needed.
  • 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 supportshafton which are supported support elements around which circles an impermeable 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.
  • a paper machine comprises two endless drainage wires guided in a common twin-wire former in the shape of an S over at least one drainage roller against a separating roller and water removal is to both sides.
  • patent application publication DE 10 2013 213667 A1 is disclosed an arrangement for forming multilayer fibrous web in fibrous web machine having suction device that is concave in surface in machine direction, and functional area of suction device is directed to surface of a joining roll.
  • An object of the invention is to create a forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web, in which the disadvantages and problems of prior art are eliminated or at least minimized.
  • the forming section according to the invention is mainly characterized by the features of the characterizing clause of the independent forming section claim and the method according to the invention is mainly characterized by the features of the characterizing clause of the independent method claim.
  • Advantageous embodiments and features are disclosed in the dependent claims.
  • the forming section for a multi-ply fiber web comprises at least one twin-wire forming part, in which the layers for the multi-ply fiber web are united and the layers of the multi-ply fiberweb are joined and a sleeve roll for joining layers of the multi-ply fiber web in a sleeve roll nip between the sleeve roll and the opposite wire of the twin-wire forming part, wherein the sleeve roll nip is located in the twin-wire forming part.
  • the sleeve roll is located in the joining position of the web layers i.e.
  • a combining roll is provided for joining together the web layers and the sleeve roll nip is located in the twin-wire forming part afterthe combining roll.
  • the sleeve roll is located in the bottom layer wire loop.
  • the forming section comprises for each web layer a headbox for feeding stock to the forming section.
  • Advantageously substantial part of water removal of each web layerfrom the stock fed to the forming part is done by a one-wire and/or by a twin-wire forming part before the web layers are joined to form the multi-ply fiber web.
  • the sleeve roll comprises a stationary support shaft, an belt loop, which is led to circle around the stationary support shaft, that the sleeve roll further comprises 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 belt loop.
  • the sleeve roll comprises a support elements supported at a distance from each other on the stationary support shaft, the belt loop to circle around the stationary support shaft is supported by the support elements and the belt loop is impermeable.
  • Advantageously joining pressure of the web layers is adjustable by adjusting the radius of curvature of the partial curves of the dewatering zone of the sleeve roll.
  • the water removal direction of the sleeve roll is towards the top web layer with lower surface property requirements.
  • the use of the sleeve roll for joining of the web layers to the multi-ply fiber web and for water removal means provides the possibility of easily as desired to select the water removal direction as the sleeve roll position and water removal direction can easily be selected.
  • the joining of the web layers to form the multi-ply fiber web by the sleeve roll in the nip between the sleeve roll and the forming wire of the twin-wire forming part provides a gentle and slow pressure increase in the nip, which advantageously is pressure is adjustable by adjusting the radius of curvature of the partial curves of the dewatering zone of the sleeve roll.
  • FIG 1 is shown an example of a forming section for a multi-ply fiber web, in this example for a two layer fiber web.
  • the forming section comprises a headbox for each layer, from which the stock suspension M10; M20 is fed to the forming unit for each layer beginning as one wire part comprising a wire 10 for the bottom layer of the multi-ply fiber web and a wire 20 for the top layerof the multi-ply fiber web, each wire comprising rolls 12, 22 for guiding and driving the wire 10; 20 as an endless loop.
  • the stock suspension M10; M20 is first fed onto the wire 10; 20 and onto the area of a forming shoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of the wire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices.
  • the run of the wire 10; 20 during this water removal on the one wire part is substantially horizontal.
  • the beginning of the forming unit with a short, substantially horizontal one-wire section comprising the forming shoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through the wires 10; 20.
  • the stock forming the top layerof the multi-ply fiber web guided on the wire 20 is afterthe one-wire partguided onto a sleeve roll 53 for further removal of water.
  • a sleeve roll 53 On the sleeve roll 53 the top layer is pressed against surface of the sleeve roll by a wire 30 comprising rolls 32 for guiding and driving the wire 30.
  • the run of the wire 20 for the top layer On the sleeve roll 50 the run of the wire 20 for the top layer is turned to be substantially vertical. After this the runs of the wire 10 for the bottom layer and the wire 20 for the top layer are united by a combining roll 23 to form a twin wire part and the webs forthe bottom layer and the top layer are guided into a gap formed between the wires 10; 20 forming the twin-wire part of the forming unit.
  • Web layers have been united together by a combining roll 23 at the beginning of the twin-wire forming part and the sleeve roll nip is located in the twin-wire forming part after the combining roll 23.
  • a sleeve roll 50 is located at a distance from the beginning of the twin-wire part for joining the top layer and the bottom layerto the multi-ply fiber web in a sleeve roll nip between the sleeve roll 50 and the upper wire 20 of the twin-wire forming part.
  • Combining roll 23 is situated in the top layer wire loop 20 and wires 10, 20 forms wrap angle over the combining roll 23, which is advantageously 1-45 degrees.
  • the wire 20 is guided to separate from multi-ply fiber web at a distance after the sleeve roll 50.
  • the multi-ply fiber web is guided on the wire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside the wire 10 loop.
  • the support foils 16 do not deviate the run of the wire 10 only remove waterfrom the bottom surface of the wire 10 and support the run of the wire 10 between the sleeve roll 50 and the following guiding or driving roll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the distance between the gap between the wires 10; 20 i.e. the beginning of the twin-wire part and the sleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower and upper wires 10, 20 wrap angle ends on the combining roll 23 and between the first point in which wires 10, 20 are in the contact on the sleeve roll 50 i.e. the point in which the contact of the wires 10, 20 begins on the sleeve roll 50. In this example water is removed upwards by the sleeve roll 50 afterthe web layers have been joined.
  • Wires 10; 20 wrap angle over the sleeve roll 50 is advantageously 40 - 90 degrees.
  • This kind of web layer combining arrangement is especially advantageous for manufacturing White top liner, in which white layer of the liner is formed on bottom layer wire 10 and brown layer of the liner is formed on top layer wire 20.
  • multi-ply web dewatering direction is towards top layer and white layer purity remains excellent. This is beneficial also in the cases where bottom side of the web forms printing surface of the multi-ply board.
  • FIG 2 is shown an example of a forming section for a multi-ply fiberweb, in this example for a two layer fiber web.
  • the forming section comprises a headbox for each layer, from which the stock suspension M10; M20 is fed to the forming unit for each layer beginning as one wire part comprising a wire 10 for the bottom layer of the multi-ply fiber web and a wire 20 for the top layerof the multi-ply fiber web, each wire comprising rolls 12, 22 for guiding and driving the wire 10; 20 as an endless loop.
  • the stock suspension M10; M20 is first fed onto the wire 10; 20 and onto the area of a forming shoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of the wire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices.
  • the run of the wire 10; 20 during this water removal on the one wire part is substantially horizontal.
  • the beginning of the forming unit with a short, substantially horizontal one-wire section comprising the forming shoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through the wires 10; 20.
  • the run of the wire 20 for the top layer is turned to be substantially vertical on a guiding or driving roll 22, on which roll 22 the top layer is pressed against surface of the roll by a wire 30 comprising rolls 32 for guiding and driving the wire 30.
  • a wire 30 comprising rolls 32 for guiding and driving the wire 30.
  • a sleeve roll 50 for joining the top layer and the bottom layer to the multi-ply fiber web in a sleeve roll nip between the sleeve roll 50 and the upper wire 20 of the twin-wire forming part.
  • Wires 10; 20 wrap angle over the sleeve roll 50 is advantageously 40 - 90 degrees.
  • a curved suction device 18 the wire 20 is guided to separate from multi-ply fiber web at a distance afterthe sleeve roll 50.
  • the multi-ply fiber web is guided on the wire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside the wire 10 loop.
  • the support foils 16 do not deviate the run of the wire 10 only remove water from the bottom surface of the wire 10 and support the run of the wire 10 between the sleeve roll 50 and the following guiding or driving roll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the web layers are joined to form the multi-ply web by the sleeve roll 50.
  • the main water removal direction on the sleeve roll 50 is downwards and substantial amount of water is removed through the bottom layer of the multi-ply fiber web, which is advantageous in cases where the surface requirements of the bottom side of the fiber web are not significant or better quality fiber is on top side of the multiply web.
  • FIG 3 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 for each layer of a multi-ply fiber web, which in this example is a two layer fiber web.
  • the forming sections for the web layers are thus gap formers, in which the stock is fed into the gap formed between two wires and afterthe web layers have been joined water is removed from the multi-ply fiber web upwards.
  • the forming section comprises a headbox for each layer, from which the stock suspension M1020; M110120 is fed to the forming unit for each layer beginning as a twin-wire part comprising wires 10; 20 for the bottom layer of the multi-ply fiber web and wires 110;120 for the top layer of the multi-ply fiber web, each wire comprising rolls 12; 22 and 112; 122 for guiding and driving the wires 10; 20 and 110; 120 as an endless loop.
  • the stock suspension M1020 forthe bottom layer is first fed between the wires 10; 20 and onto the area of a forming shoe 17 located inside the lower wire loop 10 and thereafter the stock for the bottom layer between the wires 10; 20 is guided past water removal means 25 located inside the loop of the upper wire 20, which water removal means 25 can be for example forming shoes and/or suction devices.
  • the stock suspension M1020 for the top layer is first fed between the wires 110; 120 and onto the area of a forming shoe 117 located inside the lower wire loop 110 and thereafter the stock for the top layer between the wires 110; 120 is guided past water removal means 125 located inside the loop of the upper wire 120, which water removal means 125 can be for example forming shoes and/or suction devices.
  • the beginning of the forming unit with the twin-wire section comprising the forming shoe 17; 177 removing water by suction provides for exact control of the headbox flow, so that water is sucked through the wires 10; 20
  • the runs of the lower wire 10 for the bottom layer and the upper wire 120 for the top layer are united by a combining roll 123 to form a further twin wire part and the webs for the bottom layer and the top layer are guided into a gap formed between the wires 10; 120 forming the further twin-wire part of the forming unit.
  • Web layers have been united together by a combining roll 123 at the beginning of the twin-wire forming part and the sleeve roll nip is located in the twin-wire forming part after the combining roll 123.
  • a sleeve roll 50 is located at a distance from the beginning of the twin-wire part for joining the top layer and the bottom layer to the multi-ply fiber web in a sleeve roll nip between the sleeve roll 50 and the upper wire 120 of the twin-wire forming part.
  • Combining roll 123 is situated in the top layerwire loop 120 and wires 10, 120 forms wrap angle over the combining roll 123, which is advantageously 1-45 degrees.
  • the support foils 16 do not deviate the run of the wire 10 only remove water from the bottom surface of the wire 10 and support the run of the wire 10 between the sleeve roll 50 and the following guiding or driving roll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the distance between the gap between the wires 10; 120 i.e. the beginning of the twin-wire part and the sleeve roll 50 is only about 0,2 - 4 meters.
  • the distance is measured between the point in which lower and upper wires 10, 120 wrap angle ends on the combining roll 123 and between the first point in which wires 10, 120 are in the contact on the sleeve roll 50 i.e. the point in which the contact of the wires 10, 20 begins on the sleeve roll 50.
  • water is removed upwards by the sleeve roll 50 after the web layers have been joined.
  • the main water removal direction is thus upwards, when substantial amount of water is removed through the upper layer of the multi-ply fiber web and thus the layer purity of the lower layer of the multi-ply fiber web are preserved making this example advantageous in cases where surface requirements of the bottom side of the fiber web have significance.
  • This arrangement improves significantly ply bond of the multiplyweb in cases where hybrid or gap former is used.
  • FIG 4 is shown an example of a forming section for a multi-ply fiber web, in this example for a three layer fiber web.
  • the forming section comprises a headbox for each layer, from which the stock suspension M10; M20; M30 is fed to the forming unit for each layer beginning as one wire part comprising a wire 10 for the bottom layer of the multi-ply fiber web and a wire 20 for the top layer of the multi-ply fiber web and a wire 30 the middle layer of the multi-ply fiber web, each wire comprising rolls 12, 22; 32 for guiding and driving the wire 10; 20; 32 as an endless loop.
  • the stock suspension M10; M20 is first fed onto the wire 10; 20 and onto the area of a forming shoe 17; 27; 37 and thereafter the stock on the wire is guided past inside the loop of the wire 10; 20; 30 located water removal means 11; 21; 31, which can be for example forming shoes and/or suction devices.
  • the run of the wire 10; 20; 30 during this water removal on the one wire part is substantially horizontal.
  • the beginning of the forming unit with a short, substantially horizontal one-wire section comprising the forming shoe 17; 27; 37 removing water by suction provides for exact control of the headbox flow, so that water is sucked through the wires 10; 20.
  • the runs of the wire 20 for the top layer and the wire 30 for the middle layer are turned to be substantially vertical at guiding or driving rolls 22; 32, from which rolls 22; 32 the top layer and the middle layer are guided between the wires 20; 30 during at least part of the substantially vertical run.
  • the runs of the wire 10 for the bottom layer and the wire 20 for the top layer are united by a combining roll 23 to form a twin wire part and the webs for the bottom layer, the middle layer and the top layer are guided into a gap formed between the wires 10; 20 forming the twin-wire part of the forming unit.
  • Web layers have been united together by a combining roll 23 at the beginning of the twin-wire forming part and the sleeve roll nip is located in the twin-wire forming part after the combining roll 23. So a sleeve roll 50 is located at a distance from the beginning of the twin-wire part for joining the top layer and the bottom layerto the multi-ply fiber web in a sleeve roll nip between the sleeve roll 50 and the upper wire 20 of the twin-wire forming part. By a curved suction device 18 the wire 20 is guided to separate from multi-ply fiber web at a distance after the sleeve roll 50.
  • the multi-ply fiber web is guided on the wire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside the wire 10 loop.
  • Combining roll 23 is situated in the top layer wire loop 20 and wires 10, 20 forms wrap angle over the combining roll 23, which is advantageously 1-45 degrees.
  • the support foils 16 do not deviate the run of the wires 10, 20 only remove water from the bottom surface of the wire 10 and support the run of the wire 10, 20 between the sleeve roll 50 and the following guiding or driving roll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the distance between the gap between the wires 10; 20 i.e. the beginning of the twin-wire part and the sleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower and upper wires 10, 20 wrap angle ends on the combining roll 23 and between the first point in which wires 10, 20 are in the contact on the sleeve roll 50 i.e. the point in which the contact of the wires 10, 20 begins on the sleeve roll 50. In this example water is removed upwards by the sleeve roll 50 afterthe web layers have been joined.
  • FIG 5 is shown an example of a forming section for a multi-ply fiberweb, in this example for a two layer fiber web.
  • the forming section comprises a headbox for each layer, from which the stock suspension M10; M20 is fed to the forming unit for each layer beginning as one wire part comprising a wire 10 for the bottom layer of the multi-ply fiber web and a wire 20 for the top layerof the multi-ply fiber web, each wire comprising rolls 12, 22 for guiding and driving the wire 10; 20 as an endless loop.
  • the stock suspension M10; M20 is first fed onto the wire 10; 20 and onto the area of a forming shoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of the wire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices.
  • the run of the wire 10; 20 during this water removal on the one wire part is substantially horizontal.
  • the beginning of the forming unit with a short, substantially horizontal one-wire section comprising the forming shoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through the wires 10; 20.
  • the run of the wire 20 for the top layer is turned to be substantially vertical on a guiding or driving roll 22, on which roll 22 the top layer is pressed against surface of the roll by a wire 30 comprising rolls 32 for guiding and driving the wire 30.
  • a combining roll 23 to form a twin wire part and the webs for the bottom layer and the top layer are guided into a gap formed between the wires 10; 20 forming the twin-wire part of the forming unit.
  • Web layers have been united together by a combining roll 23 at the beginning of the twin-wire forming part and the sleeve roll nip is located in the twin-wire forming part after the combining roll 23.
  • a sleeve roll 50 is located at a distance from the beginning of the twin-wire part for joining the top layer and the bottom layerto the multi-ply fiber web in a sleeve roll nip between the sleeve roll 50 and the upper wire 20 of the twin-wire forming part.
  • Combining roll 23 is situated in the top layer wire loop 20 and wires 10, 20 forms wrap angle over the combining roll 23, which is advantageously 1-45 degrees.
  • a curved suction device 18 By a curved suction device 18 the wire 20 is guided to separate from multi-ply fiber web at a distance after the sleeve roll 50.
  • the support foils 16 do not deviate the run of the wire 10 only remove water from the bottom surface of the wire 10 and support the run of the wire 10 between the sleeve roll 50 and the following guiding or driving roll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the distance between the gap between the wires 10; 20 i.e. the beginning of the twin-wire part and the sleeve roll 50 is only about 0,2 - 4 meters.
  • the distance is measured between the point in which lower and upper wires 10, 20 wrap angle ends on the combining roll 23 and between the first point in which wires 10, 20 are in the contact on the sleeve roll 50 i.e. the point in which the contact of the wires 10, 20 begins on the sleeve roll 50.
  • the fiber web is guided to a SymPress ù -type press section from the forming section by a pick-up roll 41.
  • first press nip is provided as the nip formed between a suction roll 42 and a deflection compensated roll 46
  • second press nip is provided as the nip formed between a suction roll 42 and a smooth middle roll 45
  • third press nip is provided as the nip between the smooth middle roll 45 and a roll 48 with extended nip.
  • the fiber web is guided at a guide roll 61 to a drying wire 60 of a drying section.
  • This example is advantageous in production of so called White top liner type fiber web, in which white bottom surface of the fiber web is formed by the lower forming part using the wire 10 loop for the bottom layer and further this white bottom surface is in the press section against the smooth middle roll 45.
  • the white surface which will be the outer surface in the final product and will be used as printing surface.
  • the main water removal direction is upwards, when substantial amount of water is removed through the upper layer of the multi-ply fiber web and thus the layer purity of the lower layer of the multi-ply fiber web are preserved making this example advantageous in cases where surface requirements of the bottom side of the fiber web have significance.
  • 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 leastone 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 contain several curves such that the radius of curvatures decreases in the running direction of the wires.

Claims (9)

  1. Formerpartie für eine mehrlagige Faserstoffbahn, wobei die Partie mindestens einen Doppelsieb-Formierteil umfasst, der zwischen einem Sieb (10) für die untere Lage der mehrlagigen Faserstoffbahn und einem Sieb (20; 120) für die obere Lage der mehrlagigen Faserstoffbahn geformt ist, wobei in dem Doppelsiebteil die Lagen für die mehrlagige Faserstoffbahn vereinigt werden und die Lagen der mehrlagigen Faserstoffbahn verbunden werden, dadurch gekennzeichnet, dass die Formerpartie eine Hülsenwalze (50), die einen feststehenden Stützschaft (51) umfasst, eine Bandschleife (53), die geleitet wird, um um den feststehenden Stützschaft (51) zu kreisen, umfasst, dass die Hülsenwalze (50) ferner mindestens eine kurvenförmige Entwässerungszone (K) umfasst, die aus zwei Teilkurven besteht, so dass der Krümmungsradius (K1) einer ersten Teilkurve größer ist als der Krümmungsradius (K2) einer zweiten Teilkurve, die der ersten Teilkurve (K1) in der Bewegungsrichtung der Bandschleife (53) folgt, zum Verbinden von Lagen der mehrlagigen Faserstoffbahn in einem Hülsenwalzenspalt zwischen der Hülsenwalze (50) und dem Sieb (10; 20; 120).
  2. Formerpartie nach Anspruch 1, dadurch gekennzeichnet, dass die Hülsenwalze (50) in der Verbindungsposition der Bahnlagen, d. h. am Beginn des Doppelsieb-Formierteils, angeordnet ist.
  3. Formerpartie nach Anspruch 1, dadurch gekennzeichnet, dass am Beginn des Doppelsieb-Formierteils eine Verbindungswalze (23, 123) zum Vereinigen der Bahnlagen miteinander bereitgestellt wird und der Hülsenwalzenspalt in dem Doppelsieb-Formierteil hinter der Verbindungswalze (23, 123) angeordnet ist.
  4. Formerpartie nach Anspruch 3, dadurch gekennzeichnet, dass die Hülsenwalze (50) in der Siebschleife (10) der unteren Lage angeordnet ist.
  5. Formerpartie nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Hülsenwalze (50) Stützelemente (52) umfasst, die in einem Abstand voneinander auf dem feststehenden Stützschaft (51) getragen werden, dass die Bandschleife (53), die geleitet wird, um um den feststehenden Stützschaft (51) zu kreisen, durch die Stützelemente (52) getragen wird und dass die Bandschleife (53) undurchlässig ist.
  6. Formerpartie nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Formerpartie für jede Bahnlage einen Stoffauflaufkasten zum Zuführen von Stoff zu dem Formierteil und mindestens einen Einzelsieb-Formierteil oder mindestens einen Doppelsieb-Formierteil für jede Lage, bevor die Hülsenwalze (50) die Bahnlagen verbindet, umfasst.
  7. Verfahren zum Formen einer mehrlagigen Faserstoffbahn, bei dem zumindest ein Teil des Formens in einem Doppelsieb-Formierteil vorgenommen wird, der zwischen einem Sieb (10) für die untere Lage der mehrlagigen Faserstoffbahn und einem Sieb (20; 120) für die obere Lage der mehrlagigen Faserstoffbahn geformt ist, in dem die Lagen für die mehrlagige Faserstoffbahn vereinigt werden und die Lagen der mehrlagigen Faserstoffbahn in dem Doppelsiebteil verbunden werden, dadurch gekennzeichnet, dass bei dem Verfahren die Lagen der mehrlagigen Faserstoffbahn verbunden werden in einem Hülsenwalzenspalt zwischen einer Hülsenwalze (50), die einen feststehenden Stützschaft (51) umfasst, einer Bandschleife (53), die geleitet wird, um um den feststehenden Stützschaft (51) zu kreisen, dass die Hülsenwalze (50) ferner mindestens eine kurvenförmige Entwässerungszone (K) umfasst, die aus zwei Teilkurven besteht, so dass der Krümmungsradius (K1) einer ersten Teilkurve größer ist als der Krümmungsradius (K2) einer zweiten Teilkurve, die der ersten Teilkurve (K1) in der Bewegungsrichtung der Bandschleife (53) folgt, und dem Sieb (10; 20; 120).
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Hülsenwalze (50) in der Siebschleife (10) der unteren Lage angeordnet ist.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass Wasser an der Hülsenwalze (50) hin zu der oberen Bahnlage mit geringeren Anforderungen an die Oberflächenbeschaffenheit entfernt wird.
EP17164069.1A 2017-03-31 2017-03-31 Blattbildungspartie zur herstellung einer mehrlagigen faserstoffbahn und verfahren zur herstellung einer mehrlagigen faserstoffbahn Active EP3382094B1 (de)

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CN201810254313.8A CN108691235B (zh) 2017-03-31 2018-03-26 多叠纤维幅材的成形部段和多叠纤维幅材的成形方法

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FI20185867A1 (fi) * 2018-10-15 2020-04-16 Valmet Technologies Oy Menetelmä monikerrosrainan liimaamiseksi ja muodostusosa monikerrosrainaa varten
FI128857B (en) * 2020-01-09 2021-01-29 Valmet Technologies Oy Dryer for drying coated fibrous webs and production line for producing coated multilayer fibrous webs
EP3913132A1 (de) * 2020-05-20 2021-11-24 Valmet Technologies Oy Band für eine bandwalze und dessen verwendung
EP3913135A1 (de) * 2020-05-20 2021-11-24 Valmet Technologies Oy Achsträger für eine walze einer maschine zur herstellung einer faserstoffbahn

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DE3401371A1 (de) * 1984-01-17 1985-07-25 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Verfahren zum betrieb einer papiermaschine und papiermaschine zur durchfuehrung des verfahrens
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
FI89290C (fi) 1990-09-20 1993-09-10 Tampella Oy Ab Foerfarande och anordning foer framstaellning av flerskitsbana
DE10025896A1 (de) 2000-05-25 2001-11-29 Voith Paper Patent Gmbh Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn
FI116688B (fi) * 2004-02-13 2006-01-31 Metso Paper Inc Monikerrosrainan muodostusosa
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