EP3540118B1 - Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn - Google Patents

Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn Download PDF

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Publication number
EP3540118B1
EP3540118B1 EP18161992.5A EP18161992A EP3540118B1 EP 3540118 B1 EP3540118 B1 EP 3540118B1 EP 18161992 A EP18161992 A EP 18161992A EP 3540118 B1 EP3540118 B1 EP 3540118B1
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EP
European Patent Office
Prior art keywords
web
water
wire
headbox
layer
Prior art date
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Application number
EP18161992.5A
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English (en)
French (fr)
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EP3540118A1 (de
Inventor
Hannu Turpeinen
Juha KOVANEN
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Valmet Technologies Oy
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Valmet Technologies Oy
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Priority to EP18161992.5A priority Critical patent/EP3540118B1/de
Priority to CN201910187365.2A priority patent/CN110273316B/zh
Publication of EP3540118A1 publication Critical patent/EP3540118A1/de
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/04—Head boxes of cylinder machines
    • 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
    • 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

Definitions

  • the invention pertains to a fiber web machine and to a method of forming a multiply web.
  • Document WO 99 / 40 256 A1 discloses an arrangement of three forming sections each of which having a wire guided about rolls in a closed loop and a multi-layer headbox.
  • the closed loops of the wire are guided such that liquid layers ejected on and conveyed by the wires are dewatered to form plies and then are merged such that the at least three plies occurring from the liquid layers ejected by the multi-layer headbox are sandwiched between the at least two other plies.
  • document WO 99 / 40 256 A1 discloses a web forming method using the above-described arrangement.
  • Document EP 2 784 213 B1 discloses a multi-layer headbox structure for a fiber web machine which serves to supply mainly liquid substances such as water and/or a pulp suspension liquid in a layered manner onto a wire of a forming section.
  • Additives such as refined fibers, fillers, cationic polymers such as cationic starch, etc. are added to the water and/or pulp suspension liquid.
  • These liquid substances are fed to the headbox by means of a water supply or feed water supply.
  • a central diffuser of the headbox is connected with feeding means feeding fresh water, dilution water, and/or white water into the central diffuser
  • the substances applied onto a forming wire are then dewatered to form a web. This is then further transferred to a press section for additional dewatering and a dryer section in which the formed web is dried to form a paper or board web. Further treatment depends on the respective requirements of the product.
  • Fig. 1 shows an example of such a headbox structure.
  • a fiber web machine comprises at least three forming sections. Each of these forming sections has a wire guided about rolls in a closed loop, and a headbox adapted to eject at least one layer of liquid onto the respective wire. At least one of the headboxes is a multi-layer headbox adapted to eject at least three liquid layers onto the respective wire. A center diffuser of the multi-layer headbox is connected with feeding means for feeding fresh water, dilution water and/or white water.
  • the closed loops of the wire are guided such that liquid layers ejected on and conveyed by the wires are dewatered to form plies and then are merged such that the at least three plies occurring from the liquid layers ejected by the multi-layer headbox are sandwiched between the at least two other plies.
  • the feeding means supplying the center diffuser of the multi-layer headbox can be additionally connected with a starch storage in order to supply starch with the fresh water, dilution water and/or white water.
  • the middle layer plies can be optimized in order to maximize the bulk of the web.
  • the middle layer can be divided in two separate stock layers separated by the water layer.
  • brightness levels of the layers can be individually adapted. Thus, for example when applying higher brightness to the ply next to the top ply, less bleaching is required.
  • increase of the bulk is possible. For instance, the increase of the bulk can be in a range of about 15% to 30%.
  • the fiber web machine can be used for manufacturing Folding Boxboard.
  • a method of forming a multi-ply web in a fiber web machine comprises the steps:
  • a web can be formed which has middle plies the properties of which can be advantageously adapted as desired by means of one multi-layer headbox, while the web is completed by separately formed top and back plies, respectively.
  • starch can be added to the fresh water, dilution water, and/or white water guided through the central diffuser of the multi-layer headbox.
  • middle layer's stocks By adapting the starch level, properties of the middle layer's stocks can be advantageously optimized with regard to the bulk.
  • the middle layer plies can be optimized in order to maximize the bulk of the web.
  • the middle layer can be divided in two separate stock layers separated by the water layer.
  • coarser fibers can be used in the middle layer. Accordingly, less refining is required for the fibers and the bulk can be increased. It is even possible to use different refining rates between the top and back ply sides. Also, brightness levels of the layers can be individually adapted. Thus, for example when applying higher brightness to the ply next to the top ply, less bleaching is required. Thus, increase of the bulk is possible.
  • the starch can be preferably added with an amount of 1 to 20 kg per ton of water, and most preferably with an amount of 2 to 10 kg per ton of water.
  • the bulk of the middle layer(s) can be maximized.
  • the pulp suspension comprise BCTMP (Bleached Chemi Thermo Mechanical Pulp), CTMP (Chemi Thermo Mechanical Pulp), TMP (Thermo Mechanical Pulp), PGW (Pressurized Ground Wood) and/or GW (Ground Wood), wherein the pulp suspensions guided to the one or more of the adjacent diffusers of the multi-layer headbox have a different composition.
  • broke can be added to the pulp suspensions fed to one or more of the adjacent diffusers of the multi-layer headbox, wherein the amount of broke preferably differs in the individual pulp suspensions.
  • a brightness of one of the plies of the web is higher than a brightness of the other one of the plies of the web.
  • the middle layer can be divided into two layers, both of these layers can be given different properties, e.g. by using different refining rates for the added fibers. Thereby, coarser fibers can be used which advantageously leads to a higher bulk. Also, different brightness levels can be assigned to the middle layers, leading to that less bleaching is required which is also advantageous with regard to the bulk.
  • the manufacturing cost of such kinds of multiply products is achieved by dividing the middle ply stock in two layers, and feeding chemicals to between these two layers by means of the aqua layer. Then it is possible to use coarser fibers in the middle ply (which means less refining and therewith smaller energy consumption) and to also reduce bleaching chemicals consumption (the bottom side stock of the middle layer can have a smaller brightness than the top side stock). Mainly this is achieved by feeding starch between to these two layers and starch feeding happens by this central diffuser by water (fresh water, white water, or dilution water).
  • the invention can be preferably used in FBB (folding box board) production.
  • FBB folding box board
  • FBB folding box board
  • Fig. 1 schematically shows an example of a multi-layer headbox 1 as is for example disclosed in document EP 2 784 213 B1 .
  • a multi-layer headbox 1 as is for example disclosed in document EP 2 784 213 B1 .
  • the features of such a headbox it is referred to this document, the contents of which is herewith incorporated in its entirety. Merely the features necessary for understanding the invention will be now described.
  • the multi-layer headbox 1 has plural diffusers, one of them being a central diffuser 13 connected with feeding means 7 feeding fresh water, dilution water, and/or white water into the central diffuser 13.
  • the adjacent diffusers are connected with stock header feeding means 3, 5.
  • Additional dilution water can be supplied from a dilution water feeding means 9 connectable via dilution water valves 11 with a pipe feeding stock header from stock header feeding means 5 to the diffuser being arranged above the central diffuser 13 in Fig. 1 for controlling the cross machine direction basis weight profile.
  • the dilution water valves 11 are arranged in 30mm to 150 mm intervals in the headbox cross machine direction.
  • the multi-layer headbox 1 is capable of ejecting stock layers in a layered manner onto a web of a forming section.
  • Fig. 2 is a schematic view of a fiber web machine according to the invention.
  • the fiber web machine has three forming sections 21, 25 and 29.
  • a first forming section 21 of these three forming sections 21, 25 and 29 is provided with the multi-layer headbox 1 shown in Fig. 1 .
  • the forming section 21 (also referred to as first forming section) comprises a wire guided in a closed loop via guiding rollers 210, 211 and 213.
  • Other well-known forming means such as suction boxes, suction rolls, etc. are provided with the forming section 21.
  • this merging section the web formed in this first forming section 21 is merged with another web referred to a top web.
  • the top web is formed in a second forming section 25 which basically comprises a headbox 23 (also referred to as top ply headbox) and a wire guided in a closed loop about guiding rollers 250, 251, 253 and 255.
  • the headbox 23 is a single layer headbox and, thus, ejects a single stock layer onto the wire.
  • the stock layer is also dewatered by means of well-known forming means to form the top web.
  • a merging section provided between the guiding rollers 251 and 253
  • the wire is guided in a manner contacting the wire of the first forming section 21 such that the web formed in the first forming section 21 is merged with the top web.
  • the web merged with the top web is then guided further by the wire of the second forming section 25 to a second merging section defined between guiding rollers 253 and 255.
  • the web merged with the top web is merged with a third web formed in a third forming section 29.
  • the third web is also referred to as back web.
  • the back web is formed in the third forming section which basically comprises a headbox 27 (also referred to as back ply headbox) and a wire guided in a closed loop about guiding rollers 291, 293, and 290.
  • the headbox 27 is also a single layer headbox ejecting a single stock layer onto the wire of the third forming section 29.
  • the stock layer is also dewatered by well-known means to form the back web.
  • the wire of the third forming section 29 is guided such that it approaches the wire of the second forming section 25 and contacts the same in the section between the guiding rollers 253 and 255, thereby merging the back web with the web on a side opposite of the top web.
  • the web merged with the top and back webs is then guided further and handed over at a take-over roller 31 to a wire 33 of a press section for further treatment.
  • an enhanced web can be produced in which middle plies of the web (also referred to as filler ply (plies)) are then covered from both sides by a top ply occurring from the top web and a back ply occurring from the back web.
  • middle plies of the web also referred to as filler ply (plies)
  • top ply headbox and the back ply headbox are each described as single layer headboxes, one or both of them can be embodied as multi-layer headboxes.
  • Figs. 3a to 3c schematically show a section view of the filler plies, top ply and back ply, respectively.
  • the filler plies comprise two layers 51 and 53 which are connected via a starch layer 55.
  • the starch layer occurs from the central water layer having starch added.
  • the top ply is referred to by 57 and the back ply is referred to by 59.
  • the starch is added into water forming a water layer arranged between the stock layers.
  • An amount of the starch added is in a range from 1 to 20 kg/t and preferably in a range from 2 to 10 kg/t.
  • Fig. 5 is a diagram showing the effect of the added starch amount with respect to the Scott Bond (J/m 2 ).
  • the _Huygen Scott Bond test is the most commonly used test method for quantifying the delamination resistance of paper and board.
  • coarser fibers and an increased amount of broke can be supplied to the stock layers forming the filler plies.
  • the pulp suspension comprise BCTMP, CTMP, TMP, PGW and/or GW. It is also noted that the pulp suspensions guided to the one or more of the adjacent diffusers of the multi-layer headbox preferably have a different composition.
  • the individual plies can be provided with different properties.
  • the filler ply 51 arranged directly adjacent to the top ply 57 can have a higher brightness than the other filler ply 53.

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  • Paper (AREA)

Claims (10)

  1. Faserbahnmaschine mit
    mindestens drei Formgebungsabschnitten (21, 25, 29), von denen jeder aufweist
    ein Sieb, das in einer geschlossenen Schleife um Walzen geführt wird, und
    einen Stoffauflauf (1, 23, 27), der geeignet ist, mindestens eine Flüssigkeitsschicht auf das jeweilige Sieb auszustoßen, wobei
    mindestens einer der Stoffaufläufe (1) ein Mehrschicht-Stoffauflauf ist, der dazu geeignet ist, mindestens drei Flüssigkeitsschichten auf das jeweilige Sieb auszustoßen, und
    die geschlossenen Schleifen des Siebs so geführt werden, dass auf die Siebe ausgestoßene und von ihnen geförderte Flüssigkeitsschichten entwässert und zu Lagen ausgebildet werden, und dann so zusammengeführt werden, dass die mindestens drei Lagen (51, 53, 55), die aus den von dem Mehrschicht-Stoffauflauf ausgestoßenen Flüssigkeitsschichten entstehen, zwischen den mindestens zwei anderen Lagen eingeschlossen sind,
    dadurch gekennzeichnet, dass
    ein Mitteldiffusor (13) des Mehrschichtstoffauflaufs (1) mit Zuführungsmitteln (7) zur Zuführung von Frischwasser, Verdünnungswasser und/oder Siebwasser verbunden ist.
  2. Faserbahnmaschine nach Anspruch 1, wobei
    die den Mitteldiffusor des Mehrschichtstoffauflaufs versorgende Zuführeinrichtung (27) zusätzlich mit einem Stärkespeicher verbunden ist, um mit dem Frischwasser, Verdünnungswasser und/oder Siebwasser Stärke zuzuführen.
  3. Faserbahnmaschine nach Anspruch 2, dadurch gekennzeichnet, dass
    die Faserbahnmaschine zur Herstellung von Faltschachtelkarton verwendet wird.
  4. Verfahren zur Herstellung einer mehrlagigen Bahn in einer Faserbahnmaschine, umfassend
    Einspeisung von Frischwasser, Verdünnungswasser und/oder Siebwasser in einen Mitteldiffusor (13) eines mehrlagigen Stoffauflaufs (1),
    Zuführen von Pulpesuspensionen zu jeweils benachbarten Diffusoren des Mitteldiffusors (13),
    Führen des Frischwassers, des Verdünnungswassers und/oder des Siebwassers und der verschiedenen Zellstoffsuspensionen durch den Mitteldiffusor (13), um sie auf ein Sieb eines Formabschnitts (21) auszustoßen, wobei das Sieb eine geschlossene Schleife bildet,
    Entwässerung der flüssigen Substanzen, um eine Bahn auszubilden,
    Vereinigen der Bahn mit einer zweiten an einem zweiten Stoffauflauf (23) ausgebildeten Bahn, der die Pulpesuspension auf ein Sieb eines zweiten Formabschnitts (25) ausstößt, und
    Vereinigen der Bahn mit einer dritten an einem dritten Stoffauflauf (27) ausgebildeten Bahn, der die Zellstoffsuspension auf ein Sieb eines dritten Formabschnitts (29) ausstößt, wobei die dritte Bahn auf einer Seite der Bahn angeordnet ist, die derjenigen gegenüberliegt, auf der die zweite Bahn angeordnet ist.
  5. Verfahren nach Anspruch 4, wobei
    dem Frischwasser, Verdünnungswasser und/oder Siebwasser, das durch den zentralen Diffusor (13) des Mehrschichtstoffauflaufs (1) geleitet wird, Stärke zugesetzt wird.
  6. Verfahren nach Anspruch 5, wobei
    die Stärke vorzugsweise in einer Menge von 1 bis 20 kg pro Tonne Wasser und besonders bevorzugt in einer Menge von 2 bis 10 kg pro Tonne Wasser zugegeben wird.
  7. Verfahren nach einem der Ansprüche 4 bis 6, wobei
    den Zellstoffsuspensionen, die einem oder mehreren der benachbarten Diffusoren des Mehrschichtstoffauflaufs zugeführt werden, grobe Fasern zugesetzt werden.
  8. Verfahren nach einem der Ansprüche 4 bis 7, wobei
    die Zellstoffsuspension BCTMP, CTMP, TMP, PGW und/oder GW umfasst, wobei die Zellstoffsuspensionen, die dem einen oder den mehreren benachbarten Diffusoren des Mehrschichtstoffauflaufs (1) zugeführt werden, eine unterschiedliche Zusammensetzung aufweisen.
  9. Verfahren nach einem der Ansprüche 4 bis 8, wobei den Stoffsuspensionen, die einem oder mehreren der benachbarten Diffusoren des Mehrschichtstoffauflaufs zugeführt werden, Ausschuss zugesetzt wird, wobei die Menge an Ausschuss in den einzelnen Stoffsuspensionen vorzugsweise unterschiedlich ist.
  10. Verfahren nach einem der Ansprüche 4 bis 9, wobei die Helligkeit einer der Lagen der Bahn höher ist als die Helligkeit der anderen der Lagen der Bahn.
EP18161992.5A 2018-03-15 2018-03-15 Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn Active EP3540118B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18161992.5A EP3540118B1 (de) 2018-03-15 2018-03-15 Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn
CN201910187365.2A CN110273316B (zh) 2018-03-15 2019-03-13 纤维幅材机和形成多铺层幅材的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18161992.5A EP3540118B1 (de) 2018-03-15 2018-03-15 Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn

Publications (2)

Publication Number Publication Date
EP3540118A1 EP3540118A1 (de) 2019-09-18
EP3540118B1 true EP3540118B1 (de) 2022-11-23

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EP18161992.5A Active EP3540118B1 (de) 2018-03-15 2018-03-15 Faserbahnmaschine und verfahren zur herstellung einer mehrlagigen bahn

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CN (1) CN110273316B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021202640A1 (en) * 2020-03-31 2021-10-07 Kimberly-Clark Worldwide, Inc. Zoned and/or layered substrates and method and apparatus for producing the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI78133C (fi) * 1980-03-14 1989-06-12 Valmet Oy Foerfarande vid viradelen foer en pappersmaskin samt dubbelviraformare.
FI896202A (fi) * 1989-12-22 1991-06-23 Ahlstroem Valmet Metod och anordning vid inloppslaodan av en pappers-, kartong- eller torkmaskin.
FI103211B1 (fi) * 1998-02-09 1999-05-14 Valmet Corp Lisäaineen kerrostus kartonkikoneen rainanmuodostusyksiköllä
DE102008000778A1 (de) * 2008-03-20 2009-09-24 Voith Patent Gmbh Stoffauflauf für eine Papier- oder Kartonmaschine
DE102010029617A1 (de) * 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
FI126656B (fi) * 2012-09-03 2017-03-31 Valmet Technologies Inc Järjestely kerrostetun rainan muodostamiseksi kuiturainakoneessa, monikerroskuiturainakone ja menetelmä kerrostetun rainan muodostamiseksi kuiturainakoneella
EP2784213B1 (de) 2013-03-28 2016-05-18 Valmet Technologies, Inc. Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
CN203904770U (zh) * 2014-06-11 2014-10-29 维美德技术有限公司 纸板机

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Publication number Publication date
CN110273316B (zh) 2021-08-31
EP3540118A1 (de) 2019-09-18
CN110273316A (zh) 2019-09-24

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