EP3617403B1 - Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse - Google Patents

Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP3617403B1
EP3617403B1 EP19184856.3A EP19184856A EP3617403B1 EP 3617403 B1 EP3617403 B1 EP 3617403B1 EP 19184856 A EP19184856 A EP 19184856A EP 3617403 B1 EP3617403 B1 EP 3617403B1
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EP
European Patent Office
Prior art keywords
fiber web
sizing
heat
treatment zone
fiber
Prior art date
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Application number
EP19184856.3A
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German (de)
English (en)
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EP3617403A1 (fr
Inventor
Mika Viljanmaa
Henri Vaittinen
Tuulia MÄKELÄ
Jari Ilomäki
Jani Hakola
Reijo PIETIKÄINEN
Vesa HYPPÖNEN
Kari Juppi
Seppo Luomi
Tapio Pitkäniemi
Antti RÄISÄNEN
Heikki Vatanen
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Valmet Technologies Oy
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Valmet Technologies Oy
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Publication date
Priority claimed from FI20185723A external-priority patent/FI20185723A1/en
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP21170343.4A priority Critical patent/EP3875684B1/fr
Publication of EP3617403A1 publication Critical patent/EP3617403A1/fr
Application granted granted Critical
Publication of EP3617403B1 publication Critical patent/EP3617403B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/42—Paper being at least partly surrounded by the material on both sides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/62—Reverse roll coating, i.e. applicator roll surface moving in direction opposite to that of the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • present invention relates to treating of fiber webs in a fiber web production line. More especially the present invention relates to a method according to preamble part of the independent method claim.
  • fiber webs are meant for example a paper and board webs.
  • Fiber webs such as paper and board webs are available in a wide variety of types and can be divided according to basis weight in two grades: papers with a single ply and a basis weight of 25-300 g/m 2 and boards manufactured in multi-ply technology and having a basis weight of 150-600 m/m 2 . It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
  • Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • DIP deinked pulp
  • TMP mechanical pulp
  • DIP based newsprint may contain up to 20 % filler.
  • the filler content of a virgin-fiber based newsprint furnish is about 8 %.
  • CSWO newsprint can be regarded as follows: basis weight 40-48.8 g/m 2 , PPS s10 roughness (SCAN-P 76-95) 4.0-4.5 ⁇ m, Bendtsen roughness (SCAN-P21:67) 150 ml/min, density 600-750 kg/m 3 , brightness (ISO 2470:1999) 58-59 %, and opacity (ISO 2470:1998) 92-95%.
  • Uncoated magazine paper (SC-supercalendered) grades usually contain 50 % - 75 % mechanical pulp, 5 % - 25 % chemical pulp, and 10 % - 35 % filler.
  • the paper may also contain DIP.
  • Typical values for calendered SC paper containing e.g.
  • SC-C, SC-B, and SC-A/A+ include basis weight 40-60 g/m 2 , ash content (SCAN-P 5:63) 0-35%, Hunter gloss (ISO/DIS 8254/1) ⁇ 20-50%, PPS s10 roughness (SCAN-P 76:95) 1.0-2.5 ⁇ m, density 700-1250 kg/m 3 , brightness (ISO 2470:1999) 62-75%, and opacity (ISO 2470:1998) 90-95%.
  • Coated mechanical papers include for example MFC (machine finished coated), LWC (lightweight coated), MWC (medium weight coated), and HWC (heavy weight coated) grades.
  • Coated mechanical papers usually contain 45 % -75 % mechanical or recycled fiber and 25 % - 55 % chemical pulp.
  • Semi chemical pulps are typical in LWC paper grades made in the Far East.
  • the filler content is about 5 % -10 %.
  • the grammage is typically in the range 40-80 g/m2.
  • LWC paper can be regarded as follows: basis weight 40-70 g/m 2 , Hunter gloss 50-65%, PPS S10 roughness 1.0-1.5 ⁇ m (offset) and 0.6-1.0 ⁇ m (roto), density 1100-1250 kg/m 3 , brightness 70-75%, and opacity 89-94%.
  • MFC paper machine finished coated
  • basis weight 48-70 g/m 2 Hunter gloss 25-40%
  • PPS S10 roughness 2.2-2.8 ⁇ m density 900-950 kg/ m 3
  • brightness 70-75% brightness 70-75%
  • opacity 91-95% 91-95%.
  • MWC paper medium weight coated
  • basis weight 70-90 g/ m 2 g/ m 2
  • Hunter gloss 65-70% PPS S10 roughness 0.6-1.0 ⁇ m
  • density 1150-1250 kg/ m 3 a measure of brightness
  • brightness 70-75% a measure of brightness
  • Wood free paper is divided into two segments: uncoated and coated. Conventionally, the furnish of wood free papers consists of bleached chemical pulp, with less than 10 % mechanical pulp.
  • Typical values are for uncoated WFU Copy paper: grammage 70-80 g/m 2 , Bendtsen roughness 150-250 ml/min and bulk > 1.3 cm3/g; for uncoated offset paper: grammage 60-240 g/m 2 , Bendtsen roughness 100-200 ml/min and bulk 1.2- 1.3 cm3/g; and for color copy paper: grammage 100 g/m 2 , Bendtsen roughness ⁇ 50 ml/min and bulk 1.1 cm3/g.
  • WFC coated pulp-based printing papers
  • the amounts of coating vary widely in accordance with requirements and intended application.
  • Containerboard includes both linerboard and corrugating medium. Liners are divided according to their furnish base into Kraft liner, recycled liner and white top liner. Liners are typically 1-to 3-ply boards with grammage varying in the range 100-300 g/m 2 .
  • Linerboards are generally uncoated, but the production of coated white-top liner is increasing to meet higher demands for printability.
  • the main cartonboard grades are folding boxboard (FBB), white-lined chipboard (WLC), solid bleached board (SBS) and liquid packaging board (LPB). In general, these grades are typically used for different kinds of packaging of consumer goods.
  • Carton board grades vary from one- up to five-ply boards (150-400 g/m 2 ). The top side is usually coated with from one to three layers (20-40 g/m 2 ); the back side has less coating or no coating at all. There is a wide range of different quality data for the same board grade.
  • FBB has the highest bulk thanks to the mechanical or chemi mechanical pulp used in the middle layer of the base board.
  • the middle layer of WLC consists mainly of recycled fiber, whereas SBS is made from chemical pulp, exclusively.
  • FBB's bulk typically is between 1.1-1.9 cm 3 /g whereas WLC is on range 1.1-1.6 cm 3 /g and SBS 0.95-1.3 cm 3 /g.
  • the PPS-s10-smoothess is respectively for FBB between 0.8 -2.1 ⁇ m, for WLC 1.3- 4.5 ⁇ m and for SBS 0.7 - 2.1 ⁇ m.
  • Release paper is used in label base paper in various end-use applications, such as food packaging and office labels.
  • the most common release paper in Europe is supercalendered glassine paper coated with silicone to provide good release properties.
  • Typical values for supercalendered release papers are basis weight 60 - 95 g/m 2 , caliper 55-79 ⁇ m, IGT 12-15 cm, Cobb Unger for dense side 0.9-1.6 g/m 2 and for open side 1.2-2.5 g/m 2 .
  • Coated label paper is used as face paper for release, but also for coated backing paper and flexible packings.
  • Coated label paper has a grammage of 60-120 g/m 2 and is typically sized or pre-coated with a sizer and single-blade coated on one side.
  • Some typical paper properties for coated and calendered label paper are basis weight 50-100 g/m 2 , Hunter gloss 70-85%, PPS s10 roughness 0.6-1.0 ⁇ m, Bekk smoothness 1500-2000 s and caliper 45-90 ⁇ m.
  • the fiber webs are produced in a fiber web producing process.
  • fiber web producing processes typically comprise an assembly formed by a number of apparatus arranged consecutively in the process line.
  • a typical production and treatment line comprise a head box, a wire section 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/or sections for finishing the fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section.
  • the production and treatment line also typically comprise at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus.
  • sizing is used to alter the properties of a fiber web by adding sizing agents, for example starch or other sizing agents.
  • Sizing can be divided to internal sizing and surface sizing.
  • internal sizing the sizing agent is added to pulp in the wet end of the fiber web machine before forming.
  • surface sizing the sizing agent is added onto the surface of the fiber web typically at the dry end of the fiber web machine.
  • Surface sizing is used in production of many fiber web grades, for example of uncoated fine papers and of several board grades.
  • Sizing is used in order to improve paper web properties, in particular water resistance, water absorption properties, strength, internal strength, surface strength and bending stiffness, as well as to improve adherence of coating color to the surface of the fiber web.
  • runnability as well as dusting tendency can be affected favorably.
  • An object of the invention is to create a method of treating a fiber web treatment of a fiber web, in which the above problems and disadvantages are eliminated or at least minimized.
  • a particular object of the invention is to create a method to treat the fiber web to improve the surface strength and/or the forming closed fiber web surface.
  • a particular object is to create a method to treat the fiber web to improve the strength and/or stiffness of the fiber web.
  • the fiber web is sized in a sizer, in which the sizing agent is applied onto the fiber web by two hard sizing rolls in a sizing nip, wherein the fiber web is sized with high solids content sizing agent by indirect curtain sizing in a curtain sizer and in the sizing nip at substantially uniform pressure distribution and uniform speed in cross-direction of the fiber web and after the sizing the fiber web is heat-treated in a heat-treatment zone of a heat-treatment device.
  • the treatment system for treatment of a fiber web comprises a sizer comprising two hard sizing rolls forming a sizing nip, wherein the system further comprises a heat-treatment device comprising a heat-treatment zone and the sizer is a curtain sizer with indirect application of sizing agent in high solids content and one of the hard sizing rolls is a deflection compensated roll and a substantially straight sizing nip is formed.
  • the fiber web is sized in the curtain sizer and the sizing agent is applied to the fiber web indirectly, i.e. first applying the sizing agent onto a surface of a roll forming a sizing nip, i.e. onto a surface of a sizing roll, and then applying the sizing agent to the fiber web by the sizing roll.
  • the curtain sizer comprises a slot or a slide nozzle.
  • the sizing agent is applied in high solids content, preferably in solids content 10 - 60%, more preferably 20 - 40 %.
  • the fiber web is sized with sizing agent having viscosity of 100 cP (centipoise) or over, preferably 100 cP - 2000 cP, more preferably 100 - 1500 cP.
  • the fiber web is sized with sizing agent comprising fiber suspension.
  • the fiber web is sized with sizing agent comprising natural fibers and/or synthetic fibers.
  • the sizing agent comprises for example pulp and/or cotton and/or nylon and/or polyester and/or aramid fibers.
  • the fiber web is sized with sizing agent comprising fiber suspension with 0,5 % or less fiber consistency.
  • the fibers can be nanoscale fibers and/or microscale fibers, advantageously, length of a fiber in the sizing agent is 0,1 ⁇ m - 10 mm and width of a fiber in the sizing agent is 0.01 - 30 ⁇ m.
  • surface tension of the sizing agent is 50 mN/m or less.
  • the fiber web is treated by first adding the high solids sizing agent in the sizer to the fiber web and by thereafter activating the sizing agent by pressure and heat of the heat-treatment in the heat-treatment zone and thus increasing the Young's modulus of at least surface parts of the fiber web.
  • the strength of the fiber web especially the surface strength of the fiber web, is improved as the Young's modulus of at least the surface parts of the fiber web with the heat-treated sizing agent increases due to increased and/or enhanced bonding of fibers.
  • the strength of the fiber web after the heat-treatment is improved 10 - 70%.
  • schematical form of the strength variation in thickness direction of the fiber web corresponds to the form of an I-beam cross section form.
  • the fiber web is treated by first adding the high solids sizing agent comprising fiber suspension in the sizer to the fiber web and by thereafter activating the sizing agent by pressure and heat of the heat-treatment in the heat-treatment zone and thus improving binding of the fiber suspension to the fiber web.
  • the pressure and the heat of the heat-treatment improves the adherence of the fibers of the fiber suspension of the sizing agent onto the surface of the fiber web and thus a very good surface sized fiber web is achieved for application of coating color or other surface finishing substances onto the fiber web.
  • the strength of the fiber web is improved as the Young's modulus of at least the surface parts of the fiber web with the heat-treated sizing agent increases due to increased and/or enhanced bonding of fibers.
  • the strength of the fiber web after the heat-treatment is improved 10 - 70%.
  • schematical form of the strength variation in thickness direction of the fiber web corresponds to the form of an I-beam cross section form.
  • linear load in the sizing nip is 5 - 450 kN/m, more preferably the linear load in the sizing nip is 5 - 200 kN/m.
  • the fiber web after the sizing in the curtain sizer is heat-treated in a heat-treatment zone, which is advantageously formed between a heated belt loop, in particularly metal belt loop, and a roll, advantageously a hard roll.
  • the fiber web after the sizing in the curtain sizer the fiber web is heat-treated in a heat-treatment zone, which is advantageously formed between two belt loops, in particularly metal belt loops, at least one of which is advantageously heated.
  • the length of the heat-treatment zone is 0,2 - 15 m, advantageously 0,2 - 5 m.
  • the surface temperature in the heat-treatment zone is 100 - 250 °C.
  • the pressure in the heat-treatment zone is 0,1 MPa - 30 MPa, advantageously 0,1 - 5 MPa.
  • the pressure comprises at least a low basic pressure in the heat-treatment zone but in addition thereto the pressure during the heat-treatment zone can vary, for example at least one high pressure pulse created by at least one additional roll-nip, a heat-treatment nip, placed at a location in the heat-treatment zone can be used.
  • a loading sector formed by a loading element located in the heat-treatment zone can be used to variate the pressure in the heat-treatment zone.
  • the dwell time of the fiber web in the heat-treatment zone is at least 20 ms, advantageously 100 - 10 000 ms.
  • one of the hard sizing rolls is a deflection compensated roll by which the pressure distribution and speed of the sizing nip can be adjusted in cross-direction of the fiber web and thus substantially uniform speed and uniform pressure distribution in the sizing nip in cross-direction of the fiber web is achieved.
  • the sizing nip is formed between two hard rolls.
  • a hard roll is used a roll produced of hard material or provided with a hard coating or cover.
  • the hard nip enhances the strength increase.
  • the sizing nip is formed between two hard rolls, one of which is a deflection compensated roll and due to the effect provided by the deflection compensated roll the sizing nip is substantially straight, by which the runnability of the fiber web is improved.
  • the method in accordance with the invention are used in production of a fiber web for folding box board or liner fiber web grade.
  • the system is to be by configurating an existing fiber web production line, for example by adding the system to a fiber production line without a sizing section at a location after the drying section, as the sizing section with the heat-treatment zone or by amending an existing sizing section to be in accordance with the treatment system comprising the hard nip sizer with high solids sizing agent and the heat-treatment zone in accordance with the invention.
  • either one or both sides of the fiber web are treated.
  • the method according to an advantageous aspect of the invention is also well applicable in sizing with two-component sizing agent as in this type of curtain sizing there is no return circulation of sizing substance.
  • the two-component sizing agent may harden in the return circulation and thus cause problems in the return circulation.
  • the method according to an advantageous aspect of the invention also sizing agents with platy particle shaped substance suspensions, for example kaolin, can be used as in curtain sizing no metering rods are needed for applicating the sizing substance.
  • sizing agents with platy particle shaped substance suspensions for example kaolin
  • grooves of the metering rods would block if platy particle shaped substance suspensions would be used.
  • the sizing agent can also comprise two-component sizing agent, for example lignin with acidic activator, and/or polymers, for example polyethene and/or polypropylene, and/or mineral fillers and/or particles, for example kaolin in platy particle shape.
  • sizing agents comprising cross-linking substances can be used.
  • the strength, especially the surface strength, of the fiber web is significantly improved.
  • the fiber web with high solids content sizing agent advantageously with fiber suspension, has a stiff structure as the sizing agent tends to remain more in the surface parts of the fiber web and the surface pores close and thus need of calendering is decreased.
  • the fiber web sized with sizing agent comprising according to the advantageous feature of the invention fiber suspension improves the adherence of coating color to the surface of the fiber web. Further, sizing in the nip between two hard sizing rolls does not roughen the surface smoothness of the fiber web as is typical when the sizing nip has a soft sizing roll but instead the surface smoothness increases.
  • sizing is conducted in a hard sizing nip i.e. in a nip formed between hard sizing rolls
  • inventive idea and its features are also applicable, when a soft sizing nip is used i.e. the sizing nip has at least one soft sizing roll.
  • the fiber web running in direction S substantially upwards is sized in a curtain sizer 10 comprising a sizing nip N formed between two hard sizing rolls 11, 12 with high solids content sizing agent, comprising advantageously fiber suspension, preferably 10-60 % solids content, more preferably 20 - 40 % solids content.
  • Viscosity of the sizing agent is 100 cP or over, preferably 100 cP - 2000 cP, more preferably 100 cP - 1500 cP and surface tension of the sizing agent is advantageously 50 mN/m
  • One of the hard sizing rolls 11;12 is a deflection compensated roll and thus a straight sizing nip is be formed.
  • the sizing rolls 11,12 are hard rolls.
  • the hard roll is used as the hard roll is used a ceramic or metallic roll or advantageously with a hard-polymeric roll cover (rubber, polyurethane or composite) having surface hardness 60 - 100 shoreD, advantageously 80 - 95 shoreD.
  • linear load in the sizing nip is 5 - 450 kN/m, more preferably the linear load in the sizing nip is 5 - 200 kN/m.
  • a curtain device 14, 15 is located in connection for each sizing roll 11, 12 for applying sizing agent T onto the surface of the sizing roll 11,12 and the fiber web W is sized by indirect sizing. The sizing agent T is then via the surface of the sizing roll 11, 12 guided onto the surfaces of the fiber web W such that in the sizing nip N the sizing agent is pressed to the fiber web surfaces.
  • the fiber web W has a short run and via a guide roll 13 is guided to a heat-treatment zone Z of a heat-treatment device 20, where the fiber web W is heat-treated.
  • the heat-treatment zone Z is formed between a belt run of a belt-loop 21 and a roll 22 or between a belt-run of a belt-loop 21 and another belt-run of another belt-loop 24.
  • the length of the heat-treatment zone Z is 0,2 - 15 m, advantageously 0,2 - 5 m
  • the surface temperature in the heat-treatment zone is 100 - 250 °C
  • the pressure in the heat-treatment zone is 0,1 MPa - 30 MPa, advantageously 0,1 - 5 MPa.
  • the dwell time of the fiber web in the heat-treatment zone Z is at least 20 ms, advantageously 100 - 10 000 ms.
  • the heat-treatment device 20 comprises a belt-loop 21 running and supported by guide rolls 25 and a roll 22 and the heat-treatment zone Z is formed between the run of the belt-loop 21 and the roll 22 on the run of the belt 21 on the roll 22.
  • the fiber web W is guided to run between the belt 21 and the roll 22.
  • a heat-treatment nip NZ is formed between the roll 22 and another roll 23 to further press the fiber web W in the heat-treatment zone.
  • the belt 21 is heated.
  • the heat-treatment device 20 comprises two belt-loops 21, 24 running and supported by guide rolls 25, 26 and the heat-treatment zone Z is formed between the runs of the belt-loops 21, 24.
  • the fiber web W is guided to run between the belts 21, 24.
  • In the heat-treatment zone Z at least one of the belts 21 is heated.
  • the heat-treatment device 20 comprises a belt-loop 21 running and supported by guide rolls 25 and a roll 22 and the heat-treatment zone Z is formed between the run of the belt-loop 21 and the roll 22 on the run of the belt 21 on the roll 22.
  • the fiber web W is guided to run between the belt 21 and the roll 22.
  • heat-treatment nips NZ are formed between the roll 22 and the guide rolls 25 to further press the fiber web W during its run in the heat-treatment zone.
  • the belt 21 is heated.
  • the heat-treatment device 20 comprises a belt-loop 21 running and supported by guide rolls 25 and a roll 22 and the heat-treatment zone Z is formed between the run of the belt-loop 21 and the roll 22 on the run of the belt 21 on the roll 22.
  • the fiber web W is guided to run between the belt 21 and the roll 22.
  • a heat-treatment nip NZ is formed between the roll 22 and the guide rolls 25 to further press the fiber web W during its run in the heat-treatment zone.
  • the belt 21 is heated.
  • the heat-treatment device 20 comprises a belt-loop 21 running and supported by guide rolls 25 and a roll 22 and the heat-treatment zone Z is formed between the run of the belt-loop 21 and the roll 22 on the run of the belt 21 on the roll 22.
  • the fiber web W is guided to run between the belt 21 and the roll 22.
  • the belt 21 is heated.
  • the heat-treatment device 20 comprises a belt-loop 21 running and supported by guide rolls 25 and a roll 22 and the heat-treatment zone Z is formed between the run of the belt-loop 21 and the roll 22 on the run of the belt 21 on the roll 22.
  • the fiber web W is guided to run between the belt 21 and the roll 22.
  • a loading element 29 is located in the heat-treatment zone Z to further press in a loading sector LS the fiber web W during its run in the heat-treatment zone.
  • the belt 21 is heated.

Landscapes

  • Paper (AREA)

Claims (6)

  1. Procédé de traitement d'une bande de matière fibreuse, dans lequel procédé la bande de matière fibreuse est encollée dans un calibreur (10) par encollage de rideau indirect dans un calibreur de rideau (10) dans lequel l'agent d'encollage (T) est appliqué sur la bande de matière fibreuse par deux rouleaux d'encollage (11,12) dans un interstice d'encollage (N), caractérisé en ce que la bande de matière fibreuse (W) est encollée avec un agent d'encollage à forte teneur en solides (T) ayant une teneur en solides de 10 à 60%, de préférence de 20 à 40%, et que l'agent d'encollage (T) est appliqué sur la bande de matière fibreuse par deux rouleaux d'encollage durs (11,12) et dans l'interstice d'encollage (N) et dans l'interstice, d'encollage (N) avec une répartition de pression substantiellement uniforme et une vitesse uniforme dans le sens transversal de la bande de matière fibreuse (W), que, après l'encollage , la bande de matière fibreuse (W) subit un traitement thermique dans une zone de traitement thermique (Z) d'un dispositif de traitement thermique (20), que dans la zone de traitement thermique (Z), la bande de matière fibreuse (W) est comprimée par une pression de 0,1 MPa à 30 MPa, avantageusement de 0,1 MPa à 5 MPa et que, dans la zone de traitement thermique (Z), la température de surface est de 100 à 250 °C.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans le procédé, la bande de matière fibreuse (W) est encollée avec un agent d'encollage (T) ayant une viscosité de 100 cP ou plus, de préférence de 100 cP à 2000 cP, plus préférentiellement de 100 cP à 1500 cP.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, dans le procédé, la bande de matière fibreuse (W) est encollée avec un agent d'encollage (T) comprenant une suspension de fibres, avantageusement de fibres naturelles et/ou de fibres synthétiques et que, dans le procédé, la bande de matière fibreuse (W) est encollée avec un agent d'encollage (T) comprenant une suspension de fibres ayant une consistance de fibres de 0,5 % ou moins.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, dans le procédé, l'agent de fonctionnement (T) est activé par pression et chaleur dans la zone de traitement thermique (Z) pour augmenter le module de Young au moins des parties de surface de la bande de matière fibreuse (W).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la durée d'immobilisation de la bande de matière fibreuse (W) dans la zone de traitement thermique (Z) est d'au moins 20 ms, avantageusement 100 à 10000 ms.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, dans la zone de traitement thermique (Z), la bande de matière fibreuse (W) est en outre dans au moins un interstice de traitement (NZ) ou dans au moins secteur de chargement (LS).
EP19184856.3A 2018-08-30 2019-07-08 Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse Active EP3617403B1 (fr)

Priority Applications (1)

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EP21170343.4A EP3875684B1 (fr) 2018-08-30 2019-07-08 Verfahren zur behandlung eines faservlieses und behandlungssystem zur behandlung eines faservlieses

Applications Claiming Priority (2)

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FI20185723A FI20185723A1 (en) 2018-08-30 2018-08-30 Method of treating a fibrous web and treatment system for treating a fibrous web
FI20195008A FI20195008A1 (en) 2018-08-30 2019-01-09 Fiber web treatment method and treatment system for fiber web treatment

Related Child Applications (2)

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EP21170343.4A Division-Into EP3875684B1 (fr) 2018-08-30 2019-07-08 Verfahren zur behandlung eines faservlieses und behandlungssystem zur behandlung eines faservlieses
EP21170343.4A Division EP3875684B1 (fr) 2018-08-30 2019-07-08 Verfahren zur behandlung eines faservlieses und behandlungssystem zur behandlung eines faservlieses

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EP21170343.4A Active EP3875684B1 (fr) 2018-08-30 2019-07-08 Verfahren zur behandlung eines faservlieses und behandlungssystem zur behandlung eines faservlieses

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CN111535073A (zh) * 2020-03-13 2020-08-14 安徽索亚装饰材料有限公司 一种壁纸用施胶涂布机
CN111501407A (zh) * 2020-04-24 2020-08-07 宁波天予日用品有限公司 一种铝箔纸抗菌涂层制备设备及制备工艺
DE102020117953A1 (de) 2020-07-08 2022-01-13 Voith Patent Gmbh Beschichtungsanlange und Verfahren zur Beschichtung
EP3964644A1 (fr) * 2020-09-02 2022-03-09 Valmet Technologies Oy Calibreur
EP3988713B1 (fr) * 2020-10-23 2023-11-01 Valmet Technologies Oy Procédé de traitement d'une bande de matière fibreuse et système de traitement pour le traitement d'une bande de matière fibreuse
DE102022122304A1 (de) 2021-09-03 2023-03-09 Valmet Technologies Oy Anpresswalze für eine Leimpresse und Leimpresse
EP4245916A1 (fr) * 2022-03-14 2023-09-20 Valmet Technologies Oy Procédé de traitement d'une bande de fibres et système de traitement pour le traitement d'une bande de fibres
EP4283039A1 (fr) 2022-05-24 2023-11-29 Andritz Küsters GmbH Dispositif de lissage et d'application d'un milieu d'application
DE102023106575A1 (de) 2023-03-16 2024-09-19 Voith Patent Gmbh Auftragsvorrichtung und Verfahren
DE102023114091A1 (de) 2023-05-30 2024-06-20 Voith Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn

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DE10012344A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Vorhang-Auftragsverfahren
US6869639B2 (en) * 2002-09-30 2005-03-22 Stora Enso North America Corp. Film coater and smoothing method and apparatus
EP2634311B1 (fr) * 2012-02-28 2018-01-31 Valmet Technologies, Inc. Dispositif pour le traitement d'une bande fibreuse
EP2719826A1 (fr) * 2012-10-09 2014-04-16 Metso Paper Inc. Procédé de production d'une bande de fibres et dispositif de production d'une bande de fibres
EP2808445B1 (fr) * 2013-05-30 2017-03-15 Valmet Technologies, Inc. Rouleau de déviation compensée
FI126292B (en) * 2015-08-20 2016-09-15 Valmet Technologies Oy Device for treating fiber webs
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EP3617403A1 (fr) 2020-03-04
EP3875684A1 (fr) 2021-09-08
EP3875684B1 (fr) 2023-05-31

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