EP3540117B1 - Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse - Google Patents

Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse Download PDF

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Publication number
EP3540117B1
EP3540117B1 EP18161990.9A EP18161990A EP3540117B1 EP 3540117 B1 EP3540117 B1 EP 3540117B1 EP 18161990 A EP18161990 A EP 18161990A EP 3540117 B1 EP3540117 B1 EP 3540117B1
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European Patent Office
Prior art keywords
diffuser
fiber web
ply
central
forming
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EP18161990.9A
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German (de)
English (en)
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EP3540117A1 (fr
Inventor
Sami Anttilainen
Hannu Turpeinen
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Valmet Technologies Oy
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Valmet Technologies Oy
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Priority to EP18161990.9A priority Critical patent/EP3540117B1/fr
Priority to CN201910187146.4A priority patent/CN110273315B/zh
Publication of EP3540117A1 publication Critical patent/EP3540117A1/fr
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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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • 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
    • D21F1/028—Details of the nozzle section
    • 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 present invention relates to a multilayer headbox structure for a fiber web machine, such as a paper or board making machine, for forming a fiber web, and to a method for forming a fiber web in a forming section of a fiber web machine.
  • a headbox structure basically serves to supply mainly liquid substances such as water and/or a pulp suspension liquid onto a wire of a forming section.
  • Additives such as refined fibers, fillers, cationic polymers such as cationic starch, etc. can be added to the water and/or pulp suspension liquid.
  • These liquid substances are fed to a headbox by means of a water supply or feed water supply.
  • the substances applied onto a forming wire are then dewatered to form a fiber web, such as a paper or board web. Afterward it is then further transferred to a press section for additional dewatering and a dryer section in which the formed fiber web is dried. Further treatment depends on the respective requirements of the product.
  • a multilayer headbox for a fiber web machine such as a paper or board making machine, is known from WO 2009/115479 A1 .
  • first supply means serve to supply a fibrous suspension into a guide device which is connected to a nozzle out of which the fibrous suspension emerges via a gap.
  • a dosing device serves to dose at least one additive such as a filler material or a chemical of any type, in particular a paper chemical such as a retention agent.
  • the headbox has two layers comprising a suspension and a central layer comprising water. All of these layers are guided separately in the guide device. In order to improve the formation of different liquid layers, blades are provided in the nozzle to achieve the formation of the liquid layers.
  • EP 2 784 213 A1 shows a multilayer headbox structure for a fiber web machine for forming a fiber web, comprising a multilayer headbox having a turbulence generator and a nozzle chamber having two converging walls forming a nozzle outlet.
  • the turbulence generator has a plurality of diffusers creating turbulence in liquids supplied into each respective diffuser via feeding means for feeding the liquids, each of the diffusers having an outlet into the nozzle chamber.
  • a single central diffuser is provided which is connected with feeding means feeding fresh water, dilution water, and/or white water into said central diffuser.
  • the central diffuser has two blades arranged at its outlet and extending into the nozzle chamber in a converging manner, the blades separating the fresh water, dilution water, and/or white water as the liquid flowing through the central diffuser from the liquids flowing through adjacent diffusers.
  • the central diffuser is arranged between a top ply diffuser and a back ply diffuser, in which top ply diffuser top ply pulp suspension as the liquid flows through the top ply diffuser for forming a top ply of the fiber web and in which back ply diffuser back ply pulp suspension as the liquid flows through the back ply diffuser for forming a back ply of the fiber web.
  • the object of the present invention is achieved by a multilayer headbox structure having the features of claim 1 for a fiber web machine for forming a fiber web and by a method having the features of claim 11 for forming a fiber web in a forming section of a fiber web machine.
  • a three layer fiber web (also called as a "three ply product”) can be formed by one headbox structure (one headbox with one forming unit) which dewatering capacity is able to dewater stock which is fed to the forming section of the fiber web machine.
  • a multilayer headbox structure for a fiber web machine for forming a fiber web which comprises a multilayer headbox having a turbulence generator and a nozzle chamber having two converging walls forming a nozzle outlet.
  • the turbulence generator has a plurality of diffusers creating turbulence in liquids supplied into each respective diffuser via feeding means for feeding the liquids, each of the diffusers having an outlet into the nozzle chamber, wherein central diffusers of the plurality of diffusers comprise a first central diffuser and a second central diffuser, the first central diffuser is connected with feeding means feeding fresh water, dilution water, and/or white water into the first central diffuser, the first central diffuser has two blades arranged at its outlet and extending into the nozzle chamber in a converging manner, the blades separating the fresh water, dilution water, and/or white water as the liquid flowing through the first central diffuser from the liquids flowing through adjacent diffusers, the second central diffuser is connected with feeding means feeding pulp suspension into the second central diffuser, the second central diffuser has an additional blade and a blade arranged at its outlet, the additional blade and the blade extend into the nozzle chamber in a converging manner, and the additional blade has a shorter length than
  • the plurality of diffusers at least comprises four diffusers, i.e. the top ply diffuser, the first central diffuser, the second central diffuser and the back ply diffuser.
  • the top ply diffuser is configured to form the top ply (top surface side) of the fiber web to be formed
  • the back ply diffuser is configured to form the back ply (back surface side) to the fiber web to be formed.
  • the central diffusers comprise at least the first central diffuser and the second central diffuser, which are arranged between said top ply diffuser and back ply diffuser.
  • the first central diffuser is connected with the feeding means feeding fresh water, dilution water, and/or white water into the first central diffuser, which is either arranged next (adjacent) to the top ply diffuser or the back ply diffuser.
  • the first central diffuser has the two blades which are arranged at its outlet and which extend into the nozzle chamber in a converging manner such that these blades separate the fresh water, dilution water, and/or white water as the liquid flowing through the first central diffuser from the liquids flowing through the adjacent diffusers, i.e. either between the top ply diffuser and the second central diffuser or between the back ply diffuser and the second central diffuser.
  • the second central diffuser is connected with the feeding means for feeding pulp or stock suspension.
  • the second central diffuser has the additional blade arranged at the outlet and adjacent to one of the two blades of the first central diffuser, which additional blade of the second central diffuser has a shorter length than said adjacent blade of the first central diffuser. Due to this positioning of the blade tips of the first and second central diffusers, a first central layer of the fiber web to be formed, which layer consists mainly of water (fresh water, dilution water, and/or white water), does not get mixed with the adjacent pulp suspension layers. Accordingly, the first central diffuser is configured to form a boundary layer between the adjacent pulp suspension layers.
  • the second central layer forms a middle layer, which pulp or stock properties advantageously differs from the top ply suspension and the bottom ply suspension.
  • the second central layer purity can be less or lower than the top ply purity, but it is still good enough to separate stock properties. This helps dewatering capacity in the forming section.
  • the different liquids can be supplied to a wire in a forming section in a layered manner, thus maintaining the purity of the individual liquid layers. Since no mixing of the layers can take place, various additives such as filler materials, refined fibers, cationic starch, etc. in the water layer maintain their position in the center of the web to be formed, but are not distributed to the adjacent pulp suspension layers. Accordingly, a degradation of the additives caused by mixing and a subsequent interaction with materials from an adjacent liquid layer can be avoided. Thus, the desired properties of the additives are maintained. Accordingly, adjusting the required properties of the fiber web to be formed is easily enabled by supplying the respective materials with the respective layer, because a degradation of the individual material properties of the additives due to mixing with the respectively adjacent layer cannot take place.
  • various additives such as filler materials, refined fibers, cationic starch, etc. in the water layer maintain their position in the center of the web to be formed, but are not distributed to the adjacent pulp suspension layers. Accordingly, a degradation of the additives caused by mixing and
  • top ply diffuser the second central diffuser and the back ply diffuser.
  • the top ply suspension has the best quality and the second central layer suspension has the worst quality among said pulp suspensions.
  • raw material and their cost for forming a fiber web can be reduced.
  • a second central diffuser stock (for example, formed of two second central diffusers) is separated from the adjacent top ply diffuser or back ply diffuser by means of a further blade arranged at the outlet, which the further blade has a longer length than the adjacent blade(s) of the second central diffuser and of the top ply diffuser or back ply diffuser. That is, one may say that blade lengths in the slice channel (nozzle chamber) are configured in such a manner that blades between different stock layers (i.e. between the back/top ply layer and the second central layer) are longer than blade(s) which are in the middle of such stock layers.
  • further blade(s) may be as long as the length of said two blades.
  • further tip blade distance from the nozzle outlet (slice opening) can, for example, be from 1 to 50 mm, wherein the tip of blade is inside the nozzle outlet.
  • the multilayer headbox structure for a fiber web machine for forming a fiber web according to the present invention is preferably used for manufacturing (forming) SBS (Solid Bleached Board) or FBB (Folding Boxboard) grades, wherein its middle layer stock is typically hardwood, softwood, CTMP (Chemi Thermo Mechanical Pulp) or broke. Accordingly, a bulky middle layer can be provided.
  • the top ply diffuser is connected with feeding means feeding the top ply pulp suspension into the top ply diffuser
  • the back ply diffuser is connected with feeding means feeding the back ply pulp suspension into the back ply diffuser. Accordingly, different pulp suspensions can be fed to the respective ply diffusers.
  • the top ply diffuser and the back ply diffuser can be connected with a single feeding means feeding the same pulp suspension as the top ply pulp suspension and the back ply pulp suspension into the top ply diffuser and into the back ply diffuser.
  • the same pulp suspension can be used for forming the top ply and the back ply.
  • the structure of the multilayer headbox and forming section can be simplified and thus its cost can be further reduced.
  • the top ply diffuser is formed between an adjacent blade of the first central diffuser and one of the two converging walls of the nozzle chamber, and the back ply diffuser is formed between the additional blade of the second central diffuser and the other of the two converging walls of the nozzle chamber.
  • the blades are arranged in a staggered manner in the above-mentioned headbox structures. Thereby, the accuracy of the different liquid layers can be improved.
  • At least the blades of the first central diffuser extend beyond the nozzle chamber to an outside of the multilayer headbox.
  • the formation of the liquid layers directly on the wire is ensured. Accordingly, no mixing at the boundaries between the first central water layer and the pulp suspension layers takes place.
  • tips of the blades of the first central diffuser are arranged inside the nozzle chamber.
  • a distance to a nozzle outlet also referred to as slice opening
  • a distance between the tips of the blades of the first central diffuser and the nozzle outlet (slice opening) can, for example, be set from 1 to 50 mm.
  • the blades are mounted at the respective diffuser outlet in a pivoted manner.
  • each blade is arranged in a freely pivotable manner.
  • the blade pivots about a hinge or joint provided at the end of the respective diffuser tube. Accordingly, pressure differences between the various liquid layers can be balanced, leading to a further reduction of turbulences at the boundaries of the individual liquid layers.
  • wall surfaces of each of the diffusers as well as of the blades have a smooth and uniform structure in order to prevent agitation of the respective liquid at its boundary.
  • the respective liquid layers are calmed down at their boundaries such that an interaction between the different liquid layers after their unification is avoided.
  • At least one adjustable slice tip is provided at the nozzle outlet.
  • the length of the additional blade is smaller than or equal to 95% of the length of the blades of the first central diffuser.
  • a fiber web machine which comprises a forming section having a wire guided around guiding rolls and forming a closed loop, and the multilayer headbox structure as mentioned above which is configured to eject the top ply pulp suspension, back ply pulp suspension, middle ply pulp suspension, and fresh water, dilution water and/or white water in a layered manner onto the wire to form a fiber web having multiple plies.
  • a method for forming a fiber web in a forming section of a fiber web machine comprising the steps of feeding fresh water, dilution water, and/or white water into a first central diffuser of a multilayer headbox structure, feeding pulp suspension into a second central diffuser of the multilayer headbox structure, which second central diffuser is adjacently arranged to the first central diffuser within a multilayer headbox of the multilayer headbox structure, feeding top ply pulp suspension into a top ply diffuser of the multilayer headbox structure, which top ply diffuser forms a top ply of the fiber web which is adjacently arranged to the first central diffuser, feeding back ply pulp suspension into a back ply diffuser of the multilayer headbox structure, which back ply diffuser forms a back ply of the fiber web which is adjacently arranged to the second central diffuser, guiding the fresh water, dilution water, and/or white water, and the respective pulp suspensions
  • the same pulp suspension as the top ply pulp suspension and the back ply pulp suspension are fed into the top ply diffuser and into the back ply diffuser.
  • the same quality for the top ply and the back ply of the fiber web to be formed can be achieved.
  • the above aspects of the present invention provide an advantage in that the first central water layer and the pulp suspension layers (also known as stock layers) can be combined at the nozzle outlet, but can maintain their purity because turbulences in the boundary areas of the respective layers are sufficiently maintained to such an extent that a mixing of the individual layers is prevented.
  • the combination of layers preferably takes place at a short distance upstream of the nozzle outlet.
  • the blades may extend beyond the nozzle outlet, so that the individual layers are combined only outside of the nozzle, or the blade lips may be arranged in the slice channel, which is formed by the adjustable slice lip.
  • Figure 1 is a sectional view of a multilayer headbox structure according to the present invention for a fiber web machine, such as a paper or board making machine, for forming a fiber web.
  • a headbox comprises headers 40, 41, 42, 43 which are arranged in said figure at the bottom of the left side.
  • the liquids such as pulp suspension liquid and water, are supplied from the headers 40, 41, 42, 43 to intermediate chambers 65, 66, 67, 68 via manifold pipes 60, 61, 62, 63 acting as feeding means, respectively.
  • the intermediate chambers 65, 66, 67, 68 acting as equalizing chambers are optionally provided. That is, the headers 40, 41, 42, 43 can be directly or integrally connected to the headbox.
  • a diffuser chamber in which diffuser tubes 1, 3, 4, 5, 7, 8, 9 acting as diffusers are provided, and a nozzle chamber having converging walls 21, 22 forming a slice opening (nozzle outlet) 24 are provided.
  • Each of the diffuser tubes 1, 3, 4, 5, 7, 8, 9 consists of several diffuser tubes arranged in the cross machine direction.
  • Turbulence generator pipes 71, 73, 75, 77 acting as feeding means establish communication from the headers 40, 41, 42, 43 to the diffuser tubes 1, 3, 4, 5, 7, 8, 9. Blades 11, 12, 13, 14, 15, 16 are respectively attached to outlets of the diffuser tubes 1, 3, 4, 5, 7, 8, 9 via joints 31, 32, 33, 34, 35, 36.
  • the blades 11, 12, 13, 14, 15, 16 may have a wedge-shaped cross-section, in which a thick end is attached to the respective diffuser tubes while a thin end projects towards the slice opening 24.
  • the blades 11, 12, 13, 14, 15, 16 are provided in a staggered manner.
  • a dilution water header 57 is provided and connected with the manifold pipe 61 via dilution water valves 59 for controlling the web basis weight profile in cross machine direction.
  • the dilution water valves 59 are arranged in 30 to 150 mm intervals in cross machine direction of the headbox.
  • water such as fresh water, dilution water, and/or white water is fed from the header 41 to the diffuser tubes 3 via the manifold pipe 61, the intermediate chamber 66 and the turbulence generator pipes 71, while the other diffuser tubes 1, 4, 5, 7, 8 and 9 are supplied with a stock or pulp suspension.
  • turbulence is generated in the respective liquids in order to achieve a desired distribution of the additives and materials present in the respective liquids.
  • first central layer liquid a high amount of filler, here water, is present.
  • the fiber consistency in this first central layer liquid fed from the header 41 is remarkably lower than the fiber consistency of the other liquid layers.
  • the blades 11, 12, 13, 14, 15, 16 maintain the individual liquid layers separate before the liquids are ejected towards a forming section of a fiber web making machine.
  • Each of the blades 11, 12, 13, 14, 15, 16 is attached to a wall portion between the respective diffuser tubes 1, 3, 4, 5, 7, 8, 9 via the joints 31, 33, 35, and 37 in a freely pivotable manner.
  • each of the diffuser tubes 1, 3, 4, 7 and 8 is respectively continued by two of blades 11, 12, 13, 14, 15, 16.
  • the uppermost and lowermost diffuser tubes 5 and 9 are continued by the blade 15 and a nozzle chamber wall 22 and the blade 16 and a nozzle chamber wall 21, respectively.
  • a transition from the diffuser tubes 1, 3, 4, 5, 7, 8, 9 towards the nozzle chamber i.e. the respective blades 11, 12, 13, 14, 15, 16 and the nozzle chamber walls 21 and 22, is formed in a uniform and smooth manner in order to avoid obstacles agitating the respective flow and liquid. This serves to avoid a further generation of turbulences and a corresponding agitation of the boundaries of the respective liquid layers emerging from the diffuser tubes 1, 3, 4, 5, 7, 8, 9 in between the blades 11, 12, 13, 14, 15, 16 and nozzle chamber walls 21 and 22, respectively.
  • the individual liquids flowing towards the slice opening 24 through the nozzle chamber are still separated by the respective blades 11, 12, 13, 14, 15, 16.
  • Surface friction of the blades 11, 12, 13, 14, 15, 16 maintains turbulence in the boundary areas of the individual liquid layers. Therefore, when unifying the stock or pulp suspension liquid flows which are separated by the blades 11, 14 and 16 at their tip ends, an interaction between the individual liquid layers does not take place, since the turbulence in the respective boundary regions is still small-scale.
  • stock or pulp suspension liquid flows will then merge together downstream of the tip ends of said blades.
  • the length of the blades 11, 14 and 16 can be chosen such that there is sufficient distance to the tip ends of the blades 12, 13 and 15 for ensuring that individual stock or pulp suspension will merge together.
  • the length of the blades 11, 14 and 16 is preferably up to 95% of the length of the central blades 12, 13 and 15.
  • the blades 12, 13 and 15 and the nozzle chamber walls 21 and 22 maintain turbulence in the water, stock or pulp suspension liquid flows.
  • the length of the blade 15 is equal to one of the lengths of the blades 12 and 13.
  • the liquids are ejected via the slice opening 24 in a layered manner onto a wire or fabric of a forming section for further treatment (not shown), such as dewatering, pressing and drying.
  • the distance from the tip ends of the blades 12, 13 and 15 to the forming section is short for ensuring the layered structure.
  • a slice lip 23 is provided at the upper nozzle chamber wall 22.
  • the slice lip 23 can be adjusted in its position, i.e. in particular its reach can be adjusted by known means such as horizontal or vertical slice positioners, micro adjusters, etc. To simplify matters, these are not shown in the drawing.
  • the additives and other substances present in the respective liquid layers do not interact with each other, because a mixing of the individual liquid layers can be surely excluded.
  • adjusting the properties of the web, i.e. paper or board web, to be formed by introducing additives or other substances into the stock or pulp suspension liquids/water is facilitated.
  • particularly the amount of filler in the water layer can be increased, thereby achieving a remarkable cost reduction compared to paper or board having a comparably high filler content.
  • the central diffusers comprise a first central diffuser 3 and a second central diffuser stack formed by second central diffusers 1 and 7.
  • the first central diffuser 3 is connected with the feeding means for feeding fresh water, dilution water, and/or white water into the first central diffuser 3.
  • the first central diffuser 3 has the two blades 12, 13 arranged at its outlet and extending into the nozzle chamber in a converging manner, the blades separating the fresh water, dilution water, and/or white water as the liquid flowing through the first central diffuser 3 from the liquids flowing through adjacent diffusers 1, 4.
  • the second central diffuser stack is formed by the second central diffusers 1 and 7.
  • This second central diffuser stack is separated from the adjacent back ply diffuser stack formed by the back ply diffusers 8 and 9 by means of the elongated blade 15 (the further blade) arranged at the diffuser outlet, which elongated blade has a longer length than the adjacent blades 14, 16 of the second central diffuser stack and of the back ply diffuser stack.
  • the second central diffuser stack thus has the additional blade 14 arranged at the outlet, and the additional blade 14 has a shorter length than the adjacent blade 13 of the first central diffuser 3.
  • the first central diffuser 3 is arranged between a top ply diffuser stack formed by the top ply diffusers 4, 5 and the second central diffuser stack.
  • top ply diffusers 4, 5 top ply pulp suspension as the liquid flows through the top ply diffusers 4, 5 for forming the top ply of the fiber web and in the back ply diffusers 8, 9 back ply pulp suspension as the liquid flows through the back ply diffusers 8, 9 for forming the back ply of the fiber web.
  • blade lengths in the slice channel are configured in such a manner that blades between different stock layers (i.e. between the back/top ply layer and the second central layer) are longer than blade(s) which are in the central of such stock layers.
  • the length of such further blade(s) may be as long as the length of said two blades of the first central diffuser 3.
  • Figure 2 shows another embodiment of a multilayer headbox structure according to the present invention.
  • the same and equivalent elements already described above have been assigned the same reference signs; the description thereof will not be repeated.
  • the top ply of the web to be formed is arranged at the bottom of the figure, and the back ply of the web to be formed is arranged at the top of the figure.
  • the second central layer is formed from three diffuser tubes 1, 6 and 7 and respective blades 13 to 15 as shown in said figure.
  • a dilution water header 57 is provided and connected with the manifold pipe 62 via a dilution water valve or valves 59 for controlling the web basis weight profile in cross machine direction. That is, the second central layer of the web to be formed can be provided with such a dilution water header so that raw material for forming the pulp suspension for the second central layer can be further reduced.
  • the headbox itself is not limited to the described structure comprising the turbulence generator pipe, the diffuser chamber and the nozzle chamber, but one may employ a headbox in which the header is directly connected to the diffuser. In such a headbox, there is only one set of tubes (diffuser tubes) present between the header and the diffuser chamber.
  • the present invention may also be applied to other headbox structures, such as a headbox comprising a mixing chamber where dilution water is introduced into the pulp suspension liquids.
  • filler and “additives” have been used as an example of substances added to the stock, pulp suspension or water, it is to be noted that, apart from the ones already mentioned, such additives can be refined fibers, cationic polymers, in particular cationic starch, retention chemicals or retention aid helpers, in particular microparticles or colloidal silica.
  • the additives can be admixed to the pulp in a machine chest where the stock and the white water are mixed. In this way, the additives will become easily distributed and diluted within the pulp without any additional process elements having to be arranged.
  • the water layer can be formed as the first central layer being adjacently arranged to either the top ply or the back ply of the web to be formed, and the purity of the water layer can be maintained when ejecting the unified liquids out of the slice opening.
  • additives can also be added to the water forming the first central water layer.
  • Such additives can be refined fibers, cationic polymers, in particular cationic starch, fillers (like PCC or GCC), retention chemicals or retention aid helpers, in particular microparticles or colloidal silica. This is advantageous insofar as there is no interaction between the different liquid layers and it is possible to remarkably increase the filler content.
  • the cost involved in the production of paper or board can be remarkably reduced while the desired paper or board properties, in particular paper strength, can nevertheless be achieved.
  • the above-mentioned multilayer headbox structure and its forming method for forming a fiber web can be preferably used for manufacturing (forming) SBS (Solid Bleached Board) or FBB (Folding Boxboard) grades, wherein its middle layer stock is typically hardwood, softwood, CTMP (Chemi Thermo Mechanical Pulp) or broke.
  • a bulky middle layer can be provided.

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Claims (12)

  1. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse, comprenant une caisse d'arrivée multicouche ayant un générateur de turbulence et une chambre de buse ayant deux parois convergentes (21, 22) formant une sortie de buse (24),
    le générateur de turbulence ayant une pluralité de diffuseurs (1, 3, 4, 5, 6, 7, 8, 9) créant une turbulence dans des liquides fournis dans chaque diffuseur respectif (1, 3, 4, 5, 6, 7, 8, 9) par l'intermédiaire de moyens d'alimentation (71, 73, 75, 77) pour réaliser l'alimentation en les liquides, chacun des diffuseurs (1, 3, 4, 5, 6, 7, 8, 9) ayant une sortie donnant sur la chambre de buse, dans laquelle
    des diffuseurs centraux (1, 3, 7) de la pluralité de diffuseurs (1, 3, 4, 5, 6, 7, 8, 9) comprennent un premier diffuseur central (3) et un second diffuseur central (1, 6, 7),
    le premier diffuseur central (3) est raccordé à un moyen d'alimentation (71) réalisant l'alimentation en eau fraîche, eau de dilution, et/ou eau blanche dans le premier diffuseur central (3),
    le premier diffuseur central (3) a deux lames (12, 13) agencées à sa sortie et s'étendant dans la chambre de buse de manière convergente, les lames (12, 13) séparant l'eau fraîche, l'eau de dilution, et/ou l'eau blanche, en tant que liquide s'écoulant à travers le premier diffuseur central (3), des liquides s'écoulant à travers des diffuseurs adjacents (1, 4),
    le second diffuseur central (1, 6, 7) est raccordé à un moyen d'alimentation (75) réalisant l'alimentation en suspension de pâte dans le second diffuseur central (1, 6, 7),
    le second diffuseur central (1, 6, 7) a une lame additionnelle (14) et une lame supplémentaire (15) agencées à la sortie, la lame additionnelle (14) et la lame supplémentaire (15) s'étendent dans la chambre de buse de manière convergente, et la lame additionnelle (14) a une longueur plus courte que la lame adjacente (13) du premier diffuseur central (3) et la lame supplémentaire (15) du second diffuseur central (1, 6, 7), et
    les diffuseurs centraux (1, 3, 7) sont agencés entre un diffuseur de jet supérieur (4, 5) et un diffuseur de jet arrière (8, 9), dans lequel diffuseur de jet supérieur (4, 5) une suspension de pâte de jet supérieur, en tant que liquide, s'écoule à travers le diffuseur de jet supérieur (4, 5) pour former un jet supérieur de la bande continue fibreuse et dans lequel diffuseur de jet arrière (8, 9) une suspension de pâte de jet arrière, en tant que liquide, s'écoule à travers le diffuseur de jet arrière (8, 9) pour former un jet arrière de la bande continue fibreuse.
  2. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon la revendication 1, dans laquelle le diffuseur de jet supérieur (4, 5) est raccordé à un moyen d'alimentation (73) réalisant l'alimentation en la suspension de pâte de jet supérieur dans le diffuseur de jet supérieur (4, 5), et le diffuseur de jet arrière (8, 9) est raccordé à un moyen d'alimentation (77) réalisant l'alimentation en la suspension de pâte de jet arrière dans le diffuseur de jet arrière (8, 9).
  3. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon la revendication 1, dans laquelle le diffuseur de jet supérieur (4, 5) et le diffuseur de jet arrière (8, 9) sont raccordés à un moyen d'alimentation unique réalisant l'alimentation en la même suspension de pâte que la suspension de pâte de jet supérieur et la suspension de pâte de jet arrière, dans le diffuseur de jet supérieur (4, 5) et dans le diffuseur de jet arrière (8, 9).
  4. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 3, dans laquelle
    au moins une partie du diffuseur de jet supérieur (4, 5) est formée entre une lame adjacente (12) du premier diffuseur central (3) et une (22) des deux parois convergentes (21, 22) de la chambre de buse, et
    au moins une partie du diffuseur de jet arrière (8, 9) est formée entre la lame supplémentaire (15) du second diffuseur central (1, 6, 7) et l'autre (21) des deux parois convergentes (21, 22) de la chambre de buse.
  5. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 4, dans laquelle les lames (11 à 16) sont agencées de manière décalée.
  6. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 5, dans laquelle les lames (12, 13) du premier diffuseur central (3) s'étendent au-delà de la chambre de buse vers un extérieur de la caisse d'arrivée multicouche.
  7. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 5, dans laquelle des bouts des lames (12, 13) du premier diffuseur central (3) sont agencés à l'intérieur de la chambre de buse.
  8. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 7, dans laquelle au moins une lèvre de règle ajustable (23) est prévue à la sortie de buse (24).
  9. Structure de caisse d'arrivée multicouche pour une machine de bande continue fibreuse pour former une bande continue fibreuse selon l'une quelconque des revendications 1 à 8, dans laquelle la longueur de la lame additionnelle (14) est inférieure ou égale à 95 % de la longueur des lames (12, 13) du premier diffuseur central (3).
  10. Machine de bande continue fibreuse, comprenant :
    une section de formation ayant une toile guidée autour de rouleaux de guidage et formant une boucle fermée, et
    la structure de caisse d'arrivée multicouche selon l'une quelconque des revendications 1 à 9 configurée pour éjecter la suspension de pâte de jet supérieur, la suspension de pâte de jet arrière, la suspension de pâte, et de l'eau fraîche, de l'eau de dilution et/ou de l'eau blanche de manière stratifiée sur la toile pour former une bande continue fibreuse ayant de multiples jets.
  11. Procédé pour former une bande continue fibreuse dans une section de formation d'une machine de bande continue fibreuse, comprenant les étapes de :
    l'alimentation en eau fraîche, eau de dilution, et/ou eau blanche, dans un premier diffuseur central (3) d'une structure de caisse d'arrivée multicouche,
    l'alimentation en suspension de pâte, dans un second diffuseur central (1, 6, 7) de la structure de caisse d'arrivée multicouche, lequel second diffuseur central (1, 6, 7) étant agencé de façon adjacente au premier diffuseur central (1) à l'intérieur d'une caisse d'arrivée multicouche de la structure de caisse d'arrivée multicouche,
    l'alimentation en suspension de pâte de jet supérieur, dans un diffuseur de jet supérieur (4, 5) de la structure de caisse d'arrivée multicouche, lequel diffuseur de jet supérieur (4, 5) formant un jet supérieur de la bande continue fibreuse étant agencé de façon adjacente au premier diffuseur central (3) ou au second diffuseur central (1, 6, 7)
    l'alimentation en suspension de pâte de jet arrière, dans un diffuseur de jet arrière (8, 9) de la structure de caisse d'arrivée multicouche, lequel diffuseur de jet arrière (8, 9) formant un jet arrière de la bande continue fibreuse étant agencé de façon adjacente au second diffuseur central (1, 6, 7) ou au premier diffuseur central (3),
    le guidage de l'eau fraîche, de l'eau de dilution, et/ou de l'eau blanche, et des suspensions de pâte respectives à travers les diffuseurs correspondants (1, 3, 4, 5, 6, 7, 8, 9) pour les éjecter sur une toile de la section de formation en tant que jets de stock de substances liquides de telle sorte que le premier jet central constitué de l'eau fraîche, de l'eau de dilution, et/ou de l'eau blanche forme une couche limite entre le jet supérieur ou jet arrière constitué de la suspension de pâte et
    la pâte de second jet central constituée de la suspension de pâte, et
    la déshydratation des substances liquides pour former la bande continue fibreuse.
  12. Procédé pour former une bande continue fibreuse dans une section de formation d'une machine de bande continue fibreuse, comprenant les étapes de selon la revendication 11, dans lequel
    dans les étapes d'alimentation de la suspension de pâte de jet supérieur et de la suspension de pâte de jet arrière, l'alimentation en la même suspension de pâte que la suspension de pâte de jet supérieur et la suspension de pâte de jet arrière est effectuée dans le diffuseur de jet supérieur et dans le diffuseur de jet arrière.
EP18161990.9A 2018-03-15 2018-03-15 Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse Active EP3540117B1 (fr)

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EP18161990.9A EP3540117B1 (fr) 2018-03-15 2018-03-15 Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse
CN201910187146.4A CN110273315B (zh) 2018-03-15 2019-03-13 用于纤维幅材机的多层流浆箱结构和形成纤维幅材的方法

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EP18161990.9A EP3540117B1 (fr) 2018-03-15 2018-03-15 Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923593A (en) * 1971-12-03 1975-12-02 Beloit Corp Multiple ply web former with divided slice chamber
FI896202A (fi) * 1989-12-22 1991-06-23 Ahlstroem Valmet Metod och anordning vid inloppslaodan av en pappers-, kartong- eller torkmaskin.
FI84921C (fi) * 1989-12-22 1992-02-10 Ahlstroem Valmet En eller flerskikts inloppslaoda med utvidgad reglerzon av genomloppsvolym.
SE511684C2 (sv) * 1998-03-02 1999-11-08 Valmet Karlstad Ab Flerskiktsinloppslåda
DE102008000778A1 (de) 2008-03-20 2009-09-24 Voith Patent Gmbh Stoffauflauf für eine Papier- oder Kartonmaschine
EP2784213B1 (fr) * 2013-03-28 2016-05-18 Valmet Technologies, Inc. Caisse de tête pour une machine de production d'une bande de matière fibreuse

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