EP3382094A1 - Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web - Google Patents
Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web Download PDFInfo
- Publication number
- EP3382094A1 EP3382094A1 EP17164069.1A EP17164069A EP3382094A1 EP 3382094 A1 EP3382094 A1 EP 3382094A1 EP 17164069 A EP17164069 A EP 17164069A EP 3382094 A1 EP3382094 A1 EP 3382094A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- fiber web
- forming
- web
- sleeve roll
- 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.)
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- 239000000835 fiber Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- 238000005304 joining Methods 0.000 claims description 32
- 239000000725 suspension Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000011888 foil Substances 0.000 description 11
- 229920002472 Starch Polymers 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 235000000391 Lepidium draba Nutrition 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
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- 239000011111 cardboard Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Images
Classifications
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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
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- 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
Abstract
Description
- 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 fiber web according to the preamble of the independent method claim.
- As known from the prior art in fiber web machines, especially in paper and board machines, the fiber web is produced and treated in an assembly formed by a number of apparatuses arranged consecutively in a process line. 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. In this description and the following claims by fiber webs are meant especially container-board or cartonboard webs.
- The task of a forming unit is to remove water from fiber suspension fed by the headbox. When the web is manufactured of watery fiber stock, 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. Depending on the grade of the web being manufactured, 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. Many types of devices are known on the forming unit such as foil strips, suction boxes, turning rolls, suction rolls, and rolls provided with an open surface, which have been used in many different arrangements and arrays when trying to optimize the volume, time and location of water being removed when forming the web. The manufacturing a high-quality end-product of desired grade is a function of the volume of dewatering, the dewatering method, the duration of dewatering, and the location of dewatering. When it is desired to improve the water removal capacity and to maintain or improve the quality of the end-product, many times unforeseeable problems are created as the result of which either the water removal volume has to be decreased for maintaining the desired quality or the desired quality has to be sacrificed for achieving the greater water volume.
- 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. Typically in 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.
- In patent application publication
WO9205310A1 - In patent application publication
US2002060037A1 is disclosed machine for the production of a multi-ply fiber stock web, comprising a first former including a first forming wire, said first former configured to form and convey a first fiber layer; a second former including a second forming wire, said second former configured to form and convey said second fiber layer; a couch element, said second forming wire being guided around said couch element, said first forming wire configured to convey said first fiber layer to a place of contact with said second fiber layer, said place of contact defining a couch zone, said couch element and said second forming wire being configured to be in contact prior to said couch zone; and a suction device configured to provide suction through said second forming wire to said second fiber layer in said couch zone. - Further in the joining arrangements known from prior art 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.
- Often adherence substances, such as starch, are used to ensure the joining of the layers but the 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. Additionally the starch addition requires corresponding equipment and typically also more cleaning of the surrounding equipment is needed.
- In some cases there exists needs for one side of the multi-ply fiber web to have higher surface requirements, for example for color, and water removal direction towards that side has an adverse effect as with water also impurities etc. move towards this side. In state of the art solutions it is difficult dewater for example White top liner grades after the web layers has been combined in which white layer is on to bottom side of the multi-ply web.
- In patent application publication
WO 2010046527 A1 is disclosed 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 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. - 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.
- In order to achieve the above mentioned objects 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.
- According to the invention 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 joined and treated layers combined 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. Advantageously the sleeve roll is located in the joining position of the web layers i.e. in the beginning of the twin-wire forming part or at the beginning of the twin-wire forming part a combining roll is provided for joining together the web layers and the sleeve roll nip is located in the twin-wire forming part after the combining roll. Advantageously the sleeve roll is located in the bottom layer wire loop.
- According to an advantageous feature of the invention the forming section comprises for each web layer a headbox for feeding stock to the forming section.
- According to an advantageous feature of the invention substantial part of water removal of each web layer from 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.
- According to an advantageous feature of the invention 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.
- According to an advantageous feature of the invention 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.
- According to an advantageous feature of the invention joining pressure of the web layers is pressure is adjustable by adjusting the radius of curvature of the partial curves of the dewatering zone of the sleeve roll.
- According to an advantageous feature of the invention the water removal direction of the sleeve roll is towards the top web layer with lower surface property requirements.
- By the forming section according to the invention many advantages are achieved: 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. This is important especially in cases where the consistency of the stocks forming the layers of the multi-ply fiber web varies, as in case the consistency is low too high joining pressure may break the web and as in care the consistency is high higher joining pressure values are needed. When substantial amount of water removal is done before the joining of the layers, less water removal is needed after the joining, which provides energy savings as water removal from the multi-ply fiber web with the layers combined requires more energy as the drainage resistance is greater. Also due to the possibility of using higher joining pressure the joining of the layers may be done even without using adherence substances (for example starch) or at least with less adherence substance needed.
- In the following the invention is explained in detail with reference to the accompanying drawing to which the invention is not to be narrowly limited.
- In
figure 1 is shown schematically an advantageous example of a forming section according to the invention. - In
figure 2 is shown schematically an advantageous example of a forming section according to the invention. - In
figure 3 is shown schematically an advantageous example of a forming section according to the invention. - In
figure 4 is shown schematically an advantageous example of a forming section according to the invention. - In
figure 5 is shown schematically an advantageous example of a forming section according to the invention - In
figure 6 is shown very schematically a sleeve roll. - During the course of the following description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples. In the figures some repetitive reference signs have been omitted for clarity reasons.
- In
figure 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 awire 10 for the bottom layer of the multi-ply fiber web and awire 20 for the top layer of the multi-ply fiber web, eachwire comprising rolls wire 10; 20 as an endless loop. The stock suspension M10; M20 is first fed onto thewire 10; 20 and onto the area of a formingshoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of thewire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices. The run of thewire 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 formingshoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through thewires 10; 20. The stock forming the top layer of the multi-ply fiber web guided on thewire 20 is after the one-wire part guided onto asleeve roll 53 for further removal of water. On thesleeve roll 53 the top layer is pressed against surface of the sleeve roll by awire 30 comprisingrolls 32 for guiding and driving thewire 30. On thesleeve roll 50 the run of thewire 20 for the top layer is turned to be substantially vertical. After this the runs of thewire 10 for the bottom layer and thewire 20 for the top layer are united by a combiningroll 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 thewires 10; 20 forming the twin-wire part of the forming unit. Web layers has been joined together by a combiningroll 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 combiningroll 23. So asleeve 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 thesleeve roll 50 and theupper wire 20 of the twin-wire forming part. Combiningroll 23 is situated in the toplayer wire loop 20 andwires roll 23, which is advantageously 1-45 degrees. By acurved suction device 18 thewire 20 is guided to separate from multi-ply fiber web at a distance after thesleeve roll 50. After the joining of the layers on thesleeve roll 50 the multi-ply fiber web is guided on thewire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside thewire 10 loop. The support foils 16 do not deviate the run of thewire 10 only remove water from the bottom surface of thewire 10 and support the run of thewire 10 between thesleeve roll 50 and the following guiding or drivingroll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to afirst press fabric 40 of a press section. The distance between the gap between thewires 10; 20 i.e. the beginning of the twin-wire part and thesleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower andupper wires roll 23 and between the first point in whichwires sleeve roll 50 i.e. the point in which the contact of thewires sleeve roll 50. In this example water is removed upwards by thesleeve roll 50 after the web layers have been joined. In this example as 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.Wires 10; 20 wrap angle over thesleeve 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 ontop layer wire 20. In this arrangement 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. - In
figure 2 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 awire 10 for the bottom layer of the multi-ply fiber web and awire 20 for the top layer of the multi-ply fiber web, eachwire comprising rolls wire 10; 20 as an endless loop. The stock suspension M10; M20 is first fed onto thewire 10; 20 and onto the area of a formingshoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of thewire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices. The run of thewire 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 formingshoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through thewires 10; 20. The run of thewire 20 for the top layer is turned to be substantially vertical on a guiding or drivingroll 22, on which roll 22 the top layer is pressed against surface of the roll by awire 30 comprisingrolls 32 for guiding and driving thewire 30. After this the runs of thewire 10 for the bottom layer and thewire 20 for the top layer are united to form a twin wire part and the webs for the bottom layer and the top layer are guided into a gap formed between thewires 10; 20 forming the twin-wire part of the forming unit. In the beginning of the twin-wire part is located asleeve roll 50 for joining the top layer and the bottom layer to the multi-ply fiber web in a sleeve roll nip between thesleeve roll 50 and theupper wire 20 of the twin-wire forming part.Wires 10; 20 wrap angle over thesleeve roll 50 is advantageously 40 - 90 degrees. By acurved suction device 18 thewire 20 is guided to separate from multi-ply fiber web at a distance after thesleeve roll 50. After the joining of the layers on thesleeve roll 50 the multi-ply fiber web is guided on thewire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside thewire 10 loop. The support foils 16 do not deviate the run of thewire 10 only remove water from the bottom surface of thewire 10 and support the run of thewire 10 between thesleeve roll 50 and the following guiding or drivingroll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to afirst press fabric 40 of a press section. In this example offigure 2 the web layers are joined to form the multi-ply web by thesleeve roll 50. In this example the main water removal direction on thesleeve 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. - The forming sections of types presented in examples of
figures 1-2 can also be used as a forming section in production of a fiber web with only one layer, in which case the headbox M20 for theupper wire 20 loop is not feeding any suspension onto thewire 20. By this way it is possible to manufacture only one ply fiber web with increased dewatering capacity. This also diversifies fiber web machine operation possibilities. - In
figure 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 multiply 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 after the 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-wirepart comprising wires 10; 20 for the bottom layer of the multi-ply fiber web andwires 110;120 for the top layer of the multi-ply fiber web, eachwire comprising rolls 12; 22 and 112; 122 for guiding and driving thewires 10; 20 and 110; 120 as an endless loop. The stock suspension M1020 for the bottom layer is first fed between thewires 10; 20 and onto the area of a formingshoe 17 located inside thelower wire loop 10 and thereafter the stock for the bottom layer between thewires 10; 20 is guided past water removal means 25 located inside the loop of theupper 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 thewires 110; 120 and onto the area of a formingshoe 117 located inside thelower wire loop 110 and thereafter the stock for the top layer between thewires 110; 120 is guided past water removal means 125 located inside the loop of theupper 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 formingshoe 17; 177 removing water by suction provides for exact control of the headbox flow, so that water is sucked through thewires 10; 20 After this the runs of thelower wire 10 for the bottom layer and theupper wire 120 for the top layer are united by a combiningroll 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 thewires 10; 120 forming the further twin-wire part of the forming unit. Web layers has been joined together by a combiningroll 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 combiningroll 123. So asleeve 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 thesleeve roll 50 and theupper wire 120 of the twin-wire forming part. Combiningroll 123 is situated in the toplayer wire loop 120 andwires roll 123, which is advantageously 1-45 degrees. After the joining of the layers on thesleeve roll 50 the multi-ply fiber web is guided on thewire 10 supporting the bottom side of the multiply fiber web as a one wire part during which run support foils 16 located inside thewire 10 loop. The support foils 16 do not deviate the run of thewire 10 only remove water from the bottom surface of thewire 10 and support the run of thewire 10 between thesleeve roll 50 and the following guiding or drivingroll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to afirst press fabric 40 of a press section. The distance between the gap between thewires 10; 120 i.e. the beginning of the twin-wire part and thesleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower andupper wires roll 123 and between the first point in whichwires sleeve roll 50 i.e. the point in which the contact of thewires sleeve roll 50. In this example water is removed upwards by thesleeve roll 50 after the web layers have been joined. In this example as 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. Typically in cases where bottom side of the web forms printing surface of the multiply board. This arrangement improves significantly ply bond of the multiply web in cases where hybrid or gap former is used. - In
figure 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 awire 10 for the bottom layer of the multi-ply fiber web and awire 20 for the top layer of the multi-ply fiber web and awire 30 the middle layer of the multi-ply fiber web, eachwire comprising rolls wire 10; 20; 32 as an endless loop. The stock suspension M10; M20 is first fed onto thewire 10; 20 and onto the area of a formingshoe 17; 27; 37 and thereafter the stock on the wire is guided past inside the loop of thewire 10; 20; 30 located water removal means 11; 21; 31, which can be for example forming shoes and/or suction devices. The run of thewire 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 formingshoe 17; 27; 37 removing water by suction provides for exact control of the headbox flow, so that water is sucked through thewires 10; 20. The runs of thewire 20 for the top layer and thewire 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 thewires 20; 30 during at least part of the substantially vertical run. After this the runs of thewire 10 for the bottom layer and thewire 20 for the top layer are united by a combiningroll 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 thewires 10; 20 forming the twin-wire part of the forming unit. Web layers has been joined together by a combiningroll 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 combiningroll 23. So asleeve 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 thesleeve roll 50 and theupper wire 20 of the twin-wire forming part. By acurved suction device 18 thewire 20 is guided to separate from multi-ply fiber web at a distance after thesleeve roll 50. After the joining of the layers on thesleeve roll 50 the multi-ply fiber web is guided on thewire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside thewire 10 loop. Combiningroll 23 is situated in the toplayer wire loop 20 andwires roll 23, which is advantageously 1-45 degrees. The support foils 16 do not deviate the run of thewires wire 10 and support the run of thewire sleeve roll 50 and the following guiding or drivingroll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to afirst press fabric 40 of a press section. The distance between the gap between thewires 10; 20 i.e. the beginning of the twin-wire part and thesleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower andupper wires roll 23 and between the first point in whichwires sleeve roll 50 i.e. the point in which the contact of thewires sleeve roll 50. In this example water is removed upwards by thesleeve roll 50 after the web layers have been joined. In this example as 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 surface 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. Typically in cases where bottom side of the web forms printing surface of the multiply board. - In
figure 5 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 awire 10 for the bottom layer of the multi-ply fiber web and awire 20 for the top layer of the multi-ply fiber web, eachwire comprising rolls wire 10; 20 as an endless loop. The stock suspension M10; M20 is first fed onto thewire 10; 20 and onto the area of a formingshoe 17; 27 and thereafter the stock on the wire is guided past inside the loop of thewire 10; 20 located water removal means 11; 21, which can be for example forming shoes and/or suction devices. The run of thewire 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 formingshoe 17; 27 removing water by suction provides for exact control of the headbox flow, so that water is sucked through thewires 10; 20. The run of thewire 20 for the top layer is turned to be substantially vertical on a guiding or drivingroll 22, on which roll 22 the top layer is pressed against surface of the roll by awire 30 comprisingrolls 32 for guiding and driving thewire 30. After this the runs of thewire 10 for the bottom layer and thewire 20 for the top layer are united by a combiningroll 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 thewires 10; 20 forming the twin-wire part of the forming unit. Web layers has been joined together by a combiningroll 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 combiningroll 23. So asleeve 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 thesleeve roll 50 and theupper wire 20 of the twin-wire forming part. Combiningroll 23 is situated in the toplayer wire loop 20 andwires roll 23, which is advantageously 1-45 degrees. After the joining of the layers on thesleeve roll 50 the multi-ply fiber web is guided on thewire 10 supporting the bottom side of the multi-ply fiber web as a one wire part during which run support foils 16 located inside thewire 10 loop. By acurved suction device 18 thewire 20 is guided to separate from multi-ply fiber web at a distance after thesleeve roll 50. The support foils 16 do not deviate the run of thewire 10 only remove water from the bottom surface of thewire 10 and support the run of thewire 10 between thesleeve roll 50 and the following guiding or drivingroll 12 as the multi-ply fiber web is guided towards a pick-up roll 41 for transferring the multi-ply fiber web to afirst press fabric 40 of a press section. The distance between the gap between thewires 10; 20 i.e. the beginning of the twin-wire part and thesleeve roll 50 is only about 0,2 - 4 meters. The distance is measured between the point in which lower andupper wires roll 23 and between the first point in whichwires sleeve roll 50 i.e. the point in which the contact of thewires sleeve roll 50. In the example offigure 5 the fiber web is guided to a SymPress™ -type press section from the forming section by a pick-up roll 41. In the press section first press nip is provided as the nip formed between asuction roll 42 and a deflection compensatedroll 46, second press nip is provided as the nip formed between asuction roll 42 and a smoothmiddle roll 45 and third press nip is provided as the nip between the smoothmiddle roll 45 and aroll 48 with extended nip. After the press section the fiber web is guided at aguide roll 61 to adrying 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 thewire 10 loop for the bottom layer and further this white bottom surface is in the press section against the smoothmiddle roll 45. Thus very good surface properties are achieved for the white surface, which will be the outer surface in the final product and will be used as printing surface. In this example as 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. - In
figure 6 is schematically shown asleeve roll 50 with decreasing radius, which comprises astationary support shaft 51 on which supportelements 52 are supported at a distance from each other, animpermeable belt loop 53 which is led to circle around thestationary support shaft 51 supported by thesupport elements 52. Thesleeve roll 50 further comprises at least one curvilinear dewatering zone K via which thewires belt loop 53. The degree of curvature of the curve of the curvilinear dewatering zone K increases in the travel direction of thebelt 53 such that increasing dewatering pressure is applied to the stock suspension travelling between thewires 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. - Above only some advantageous examples of the inventions has been described to which examples the invention is not to be narrowly limited and many modifications and alterations are possible within the invention.
Claims (12)
- Forming section for a multi-ply fiber web comprising at least one twin-wire forming part formed between a wire (10) for the bottom layer of the multi-ply fiber web and a wire (20; 120) for the top layer of the multi-ply fiber web, in which twin-wire part in the layers for the multi-ply fiber web are joined and treated layers combined characterized in that the forming section comprises a sleeve roll (50) for joining layers of the multi-ply fiber web in a sleeve roll nip between the sleeve roll (50) and the wire (10; 20; 120).
- Forming section according to claim 1, characterized in that the sleeve roll nip is located in the twin-wire forming part and that the sleeve roll (50) is located in the joining position of the web layers i.e. in the beginning of the twin-wire forming part.
- Forming section according to claim 1, characterized in that at the beginning of the twin-wire forming part a combining roll (23, 123) is provided for joining together the web layers and the sleeve roll nip is located in the twin-wire forming part after the combining roll (23,123).
- Forming section according to claim 3, characterized in that the sleeve roll (50) located in the bottom layer wire (10) loop.
- Forming section according to any of claims 1 - 4, characterized in that the sleeve roll (50) comprises a stationary support shaft (51), an belt loop (53), which is led to circle around the stationary support shaft (51), that the sleeve roll (50) further comprises at least one curvilinear dewatering zone (K) consisting 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).
- Forming section according to any of claims 1 - 4, characterized in that the sleeve roll (50) comprises support elements (52) supported at a distance from each other on the stationary support shaft (51), that the belt loop (53) led to circle around the stationary support shaft (51) is supported by the support elements (52), and that the belt loop (53) is impermeable.
- Forming section according to any of claims 1 - 6, characterized in that the forming section comprises for each web layer a headbox for feeding stock to the forming part and at least one one-wire forming part or at least one twin-wire forming part for each layer before the sleeve roll (50) joining the web layers.
- Method for forming a multi-ply fiber web, in which at least part of the forming is done in a twin-wire forming part formed between a wire (10) for the bottom layer of the multi-ply fiber web and a wire (20; 120) for the top layer of the multi-ply fiber web, in which the layers for the multi-ply fiber web are joined and treated layers combined in the twin-wire part, characterized in that in the method the layers of the multi-ply fiber web are joined in a sleeve roll nip between a sleeve roll (50) and the wire (10; 20; 120).
- Method according to claim 8, characterized in that the sleeve roll (50) is located in the bottom layer wire (10) loop.
- Method according to claim 8 or 9, characterized in that substantial part of water removal of each web layer from the stock fed to the forming section 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.
- Method according to any of claims 8 - 10, characterized in that joining pressure of the web layers is pressure is adjustable by adjusting the radius of curvature of the partial curves of the dewatering zone of the sleeve roll (50).
- Method according to any of claims 9 - 11, characterized in that water is removed at the sleeve roll (50) is towards the top web layer with less surface property requirements.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP17164069.1A EP3382094B1 (en) | 2017-03-31 | 2017-03-31 | Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web |
CN201810254313.8A CN108691235B (en) | 2017-03-31 | 2018-03-26 | Forming section of a multi-stack fiber web and method for forming a multi-stack fiber web |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP17164069.1A EP3382094B1 (en) | 2017-03-31 | 2017-03-31 | Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web |
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EP3382094A1 true EP3382094A1 (en) | 2018-10-03 |
EP3382094B1 EP3382094B1 (en) | 2023-09-06 |
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EP17164069.1A Active EP3382094B1 (en) | 2017-03-31 | 2017-03-31 | Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web |
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Cited By (2)
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CN111041892A (en) * | 2018-10-15 | 2020-04-21 | 维美德技术有限公司 | Method for sizing a multi-layer sheet fiber web and forming section of a multi-layer sheet fiber web |
US20210363698A1 (en) * | 2020-05-20 | 2021-11-25 | Valmet Technologies Oy | Fiber Web Machine Sleeve Roll Belt |
Families Citing this family (2)
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FI128857B (en) * | 2020-01-09 | 2021-01-29 | Valmet Technologies Oy | Dryer for drying coated fiber webs and production line for producing coated multi-ply fiber webs |
EP3913135A1 (en) * | 2020-05-20 | 2021-11-24 | Valmet Technologies Oy | Axle beam for a roll of a fiber web forming machine |
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US11725344B2 (en) * | 2020-05-20 | 2023-08-15 | Valmet Technologies Oy | Fiber web machine sleeve roll belt |
Also Published As
Publication number | Publication date |
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CN108691235A (en) | 2018-10-23 |
EP3382094B1 (en) | 2023-09-06 |
CN108691235B (en) | 2021-03-02 |
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