EP3919679A1 - Behandlungsabschnitt einer produktionslinie zur herstellung einer barrierebeschichteten faserbahn - Google Patents

Behandlungsabschnitt einer produktionslinie zur herstellung einer barrierebeschichteten faserbahn Download PDF

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Publication number
EP3919679A1
EP3919679A1 EP21170096.8A EP21170096A EP3919679A1 EP 3919679 A1 EP3919679 A1 EP 3919679A1 EP 21170096 A EP21170096 A EP 21170096A EP 3919679 A1 EP3919679 A1 EP 3919679A1
Authority
EP
European Patent Office
Prior art keywords
fiber web
coating
line
coater
curtain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21170096.8A
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English (en)
French (fr)
Other versions
EP3919679B1 (de
Inventor
Seppo Luomi
Timo Nurmiainen
Mika Viljanmaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
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Valmet Technologies Oy
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Filing date
Publication date
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Publication of EP3919679A1 publication Critical patent/EP3919679A1/de
Application granted granted Critical
Publication of EP3919679B1 publication Critical patent/EP3919679B1/de
Active legal-status Critical Current
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Classifications

    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • 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
    • 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
    • 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
    • B05C9/06—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 two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

Definitions

  • the invention relates to producing a barrier coated fiber web. Especially the invention relates to a treatment section according to the features of the preamble part of claim 1.
  • a typical production line comprises 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 calender, a sizer, a final-calender, a coating section.
  • the production line also typically comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus or a sheet cutter.
  • sizing is used to alter the properties of a fiber web by adding sizing substances, for example starch.
  • 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 substance is added onto the surface of the fiber web directly or via a roll typically at the dry end of the fiber web machine but the sizing substance can be added onto the fiber web at other parts of the fiber web production line, also.
  • the sizing of paper and board web typically utilize a separate sizer.
  • Coated fiber web grades and coating are becoming more and more popular and thus the coating process and equipment have increasing demands imposed thereon.
  • coating especially in pigment coating, at least one of the surfaces of a fiber web is formed with one or more layers of coating color (coating substance) at a coating station followed by drying.
  • the process of coating can be divided in supplying the coating color onto the web surface, which is called the application of the coating color, as well as in the adjustment of final amount of coating color.
  • the coating of paper and board web typically utilize a coating device - a coater.
  • different kinds of coating technology are employed in prior art arrangements, for example curtain coating, blade coating, spray coating or film transfer coating technology.
  • barrier coated fiber web products i.e. barrier products are typically coated paper or board -based fiber web products which have one or more layers with barrier function such as water barrier, water vapor barrier, grease/oil/solvent barrier, gas and aroma -barrier.
  • barrier layers are against the penetration of gases (odor, aroma, oxygen, nitrogen, carbon dioxide, water vapor etc.), against the penetration of fluids and solvents either polar (f. ex. water) or non-polar (f. ex. grease, oil), against the penetration of solids and contamination of particles (nano-particles, dust, fumes, dirt etc.) and of germs, bacteria, fungi etc., and against the penetration of radiation (electromagnetic, f. ex. visible light, IR, US, X-ray, "electro smog" et.) and of radioactivity.
  • a barrier product may have one or more barrier layers with one or more different barrier functions.
  • Barrier coated fiber webs have been produced for example by applying melt coating polymer by extrusion onto the surface of the fiber web and/or by laminating onto the surface of the fiber web an aluminum foil by off-line melt coating polymer coaters, advantageously extruders.
  • a disadvantage in extrusion coated barrier products is their poor pulping properties and thus poor recyclability.
  • Application by dispersion coating off-line has also been used, in which binder for example latex with several different types of fillers and/or mineral pigments and/or additives is applied.
  • the use of dispersion coating has been limited due to more expensive coating substances than typically used in extrusion coating.
  • the coating has been dried after application in order to provide a fixed, continuous, non-porous coating with desired barrier properties onto the surface of the fiber web.
  • a barrier coated fiber web for example for liquid packages, is produced in a fiber web production line by applying melt coating polymer onto the surface of the fiber web by an off-line melt coating polymer coater.
  • melt coating polymer onto the surface of the fiber web by an off-line melt coating polymer coater.
  • melt coating polymer coating could be possible, but the disadvantages relating to poor pulping properties and thus poor recyclability of melt coating polymer coated fiber webs have so far proven the on-line melt coating polymer coating non-reasonable.
  • barrier coated fiber webs In production of barrier coated fiber webs one important factor is requirement of high hygienic level to prevent contamination of the barrier coated fiber web of the packaging applications having high hygienic requirements.
  • EP3286378B1 is disclosed a method for manufacturing coated paperboard suitable for packaging paperboard applications, the method comprising coating a first surface of the paperboard web by applying a first coating composition in a precoating unit for forming a precoating layer comprising inorganic mineral pigment particles and least one binder for sealing the first surface of the paperboard web, weight of the precoating layer being less than 30 g/m ⁇ 2> , and a second coating composition in form of an aqueous polymer dispersion in a curtain coating unit for forming at least one barrier coating layer having a weight less than 20 g/m ⁇ 2> on top of the precoating layer, and a third coating composition comprising a polymer dispersion in the curtain coating unit for forming at least one heat sealable coating layer, having a weight less than 20 g/m ⁇ 2> , on top of the barrier coating layer, whereby the second and third coating layers are applied simultaneously as aqueous dispersions without intermediate drying between the coating layers.
  • An object of the present invention is to create a treatment section of a production line for producing a barrier coated fiber web, in which problems and disadvantages of the treatment sections and methods known from prior art are eliminated or at least minimized.
  • Another object of the present invention is to create an improved treatment section of a production line for producing a barrier coated fiber web, especially in view of flexibility of production.
  • the treatment section of a production line for producing a barrier coated fiber web, in particular a barrier coated carton board web which treatment section comprises a coating section comprising at least one off-line melt coating polymer coater, advantageously extruder, and an unwinder and a rewinder, wherein the coating section comprises at least one off-line curtain dispersion coater and the unwinder and/or the rewinder are common to the at least one off-line melt coating polymer coater and to the at least one off-line curtain dispersion coater.
  • the off-line curtain dispersion coater is a multilayer curtain dispersion coater for applying one or more coating substance layers onto one or both sides of the fiber web by curtain slots.
  • the off-line curtain dispersion coater is formed of successive curtain dispersion coaters, each for one or more coating substance layers, for applying one or more coating substance layers onto one or both sides of the fiber web.
  • the treatment section is configured to be an off-line treatment section of a production line for a barrier coated fiber web, which production line comprises on-line sections for producing an uncoated fiber web.
  • the production line comprises a head box, a wire section, a press section, a drying section and, a reel-up.
  • the treatment section comprises a sizer and a calender.
  • the treatment section and the treatment method for producing a barrier coated fiber web have the combination of the off-line melt coating polymer coating and the off-line dispersion curtain coating.
  • the treatment section comprises more than one an off-line melt coating polymer coaters and more than one off-line melt coating polymer coaters.
  • the treatment section of a production line for producing a barrier coated fiber web By the treatment section of a production line for producing a barrier coated fiber web and its advantageous features many advantages are achieved: Flexibility of the production is achieved as both melt coating polymer coated fiber webs and dispersion coated fiber webs can be produced by the same production line.
  • the coating layers can be applied on one side of the fiber web or on both sides of the fiber web and depending on the need both sides of the fiber web can be coated by melt coating polymer coating or by dispersion coating or one side of the fiber web can be coated by melt coating polymer coating and the other side of the fiber web by dispersion coating.
  • the off-line dispersion curtain coater provides the possibility of coating the fiber web on one or both sides by pigment coating, which even makes possible to produce new variety of fiber web grades.
  • curtain coating method especially by a so-called cabinet coater, inside of which there is typically no need to enter, is very hygienic compared to other typical coating methods, as splashes and dripping of coating substance in this method is substantially non-existent.
  • the present invention thus provides for significant advantages in view of producing variety of different grades of fiber webs, which remarkably increases the total efficiency of the fiber web production line.
  • the production line of a barrier coated fiber web product is shown very schematically and it is well understood by one skilled in the art that the actual production line for the barrier coated fiber web product comprises several components, parts and devices which can be constructed in various ways known as such to one skilled in the art. It should also be noted that the invention can be utilized both in connection with production of one-sided fiber web products and in connection with two-sided fiber web products and for many types of barrier coated fiber web products (barrier products). It should also be noted that the treatment section may comprise more than one an off-line melt coating polymer coaters and more than one off-line melt coating polymer coater as well as other related sections, devices, and equipment.
  • the production line 100 comprises a head box 10, a wire section (i.e. forming section) 15 and a press section 20 as well as a subsequent drying section 25, a sizer 30 and an optional calender 40 and a reel-up 45.
  • the off-line treatment section 150 of the production line 100 comprises an unwinder 55, a coating section 60;65, a rewinder 70 and a slitter-winder 75.
  • the on-line part of the production line 100 thus comprises the head box 10, the wire section (i.e. forming section) 15 and the press section 20 as well as a subsequent drying section 25, the sizer 30 and the optional calender 40 and the reel-up 45 and a parent roll 50 of uncoated fiber web is produced.
  • the parent roll 50 of the uncoated fiber web is transferred to the off-line treatment section 150 comprising the unwinder 55, the coating section 60;65, the rewinder 70 and the slitter-winder 75 and customer rolls 85 of barrier coated fiber web is produced.
  • the parent roll 50 may be produced in an intermediate slitter-winder (not shown) before transferring the rolls to the off-line treatment section 150 for production of the customer rolls 85 of barrier coated fiber web.
  • the coating section 60;65 of the treatment section 150 comprises drying and/or cooling equipment (not shown) to dry/cool the fiber web before reeling the fiber web in the rewinder 70.
  • Optional cooling devices 80 are in this example located before the sizer 30 and the calender 40 and the reel-up 45 and the rewinder 70.
  • the sizer 30 can be located in any other part or section of the production line before the coating section 60;65.
  • the sizer 30 is advantageously a pond size press, a film size press, a spray sizer or very advantageously a nip sizer with curtain applicator(s) or a foam applicator(s).
  • the coating section 60;65 of the off-line treatment section 150 comprises at least one melt coating polymer coater 60, advantageously extruder 60, and at least one multilayer curtain dispersion coater 65 with one or more curtain slots for applying one or more coating substance layers onto the fiber web to provide the barrier coating layer/-s onto one or both sides of the fiber web.
  • the curtain dispersion coater 65 can also be formed of successive curtain dispersion coaters, each for one or more coating substance layers.
  • the unwinder 55 and the rewinder 70 are common to the off-line melt coating polymer coater 60 and to the off-line curtain dispersion coater 65. At least, the unwinder 55 or the rewinder 70 are common to the off-line melt coating polymer coater 60 and to the off-line curtain dispersion coater 65.
  • the fiber web is fed onto the wire section (i.e. forming section) 15, in which water is removed from the pulp by water removal means.
  • the press section 20 water is further removed by pressing the fiber web in press nips and/ or in shoe - or belt nips.
  • the subsequent drying section 25 the fiber web is dried, typically by contact drying by leading the fiber web to run in contact over heated surfaces of drying cylinders.
  • the drying section 25 in the sizer 30 sizing substance is applied onto the fiber web and thereafter the fiber web is typically dried by following drying equipment 35. Thereafter the fiber web may be calendered in the optional calender 40.
  • the reel-up 45 the fiber web is reeled into the parent roll 50 of uncoated fiber web.
  • the parent roll 50 may be produced in an intermediate slitter-winder (not shown) before transferring the rolls to the off-line treatment section 150 for production of the customer rolls 85 of barrier coated fiber web.
  • the parent roll 50 of uncoated fiber web is transferred to the off-line treatment section 150 and is first unwound in the unwinder 55. Then, at least one coating layer is applied onto the fiber web in the coating section 60;65 in order to provide the barrier coating. After coating the fiber web is, if needed, dried by drying equipment (not shown), typically at least in the beginning of this drying by contactless drying equipment. The fiber web may also be cooled by cooling equipment (not shown) after the coating. In the rewinder 70 the barrier coated fiber web is reeled into the parent roll, which is unwound in an unwinder of the slitter-winder 75 ja then slit into partial webs in a slitter, which are wound to customer rolls 85 in the winder. T
  • Figure 2 shows schematically some alternatives of advantageous coating systems in the off-line treatment section 150.
  • the coating section 60;65 of the off-line treatment section 150 comprises an unwinder 55 and a rewinder 70, an off-line melt coating polymer coater 60, advantageously extruder 60, and an off-line curtain dispersion coater 65, which comprises a curtain dispersion coater 65 for applying one or more coating substance layers onto the fiber web.
  • the curtain dispersion coater 65 is in the alternative of the upper row of figure 2 a multilayer curtain dispersion coater for applying one or more coating substance layers by one or more curtain slots 651, 652, 653 to provide the barrier coating layer/-s onto one or both sides of the fiber web.
  • the curtain dispersion coater 65 can also be formed of successive curtain coaters 65F, 65S, 65T, each for applying one or more coating substance layers i.e. with one or more curtain slots.
  • the unwinder 55 and the rewinder 70 are common to the off-line melt coating polymer coater 60 and to the off-line curtain dispersion coater.
  • the unwinder 55 or the rewinder 70 are common to the off-line melt coating polymer coater 60 and to the off-line curtain dispersion coater 65.
  • the alternatives of the advantageous coating systems by the melt coating polymer coater 60, advantageously extruder 60, and the curtain dispersion coater 65 are denoted in the figure 2 by letters A, B, C, D.
  • the parent roll 50 of uncoated fiber web is transferred from the on-line part of the production line 100 and unwound in the unwinder 55 before the barrier coating.
  • the parent roll 50 smaller size rolls may be produced in an intermediate slitter-winder (not shown) before transferring the rolls to the off-line treatment section 150 for production of the customer rolls 85 of barrier coated fiber web.
  • the in the unwinder 55 unwound, uncoated fiber web is coated only on one side, first by a curtain slot 651; 652; 653 of the curtain dispersion coater 65 a dispersion coating layer is applied as a first coating layer and thereafter a melt coating polymer coating layer is applied as a second coating layer by the melt coating polymer coater, advantageously extruder 60. Then, the barrier coated fiber web is wound in the rewinder 70.
  • the in the unwinder 55 unwound, uncoated fiber web is coated on both sides, first by the curtain coater 65F of the curtain dispersion coater 65 a dispersion coating layer is applied as a first coating layer on one side of the fiber web, then by the curtain coater 65S of the curtain dispersion coater 65 a dispersion coating layer is applied as a second coating layer on the one side of the fiber web and thereafter by the curtain coater 65T of the curtain dispersion coater 65 a dispersion coating layer is applied as a first coating layer on other side of the fiber web and thereafter a melt coating polymer coating layer is applied by the melt coating polymer coater 60, advantageously extruder 60, as a second coating layer on the other side of the fiber web. Then, the barrier coated fiber web is wound in the rewinder 70.

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  • Application Of Or Painting With Fluid Materials (AREA)
EP21170096.8A 2020-06-01 2021-04-23 Behandlungsabschnitt einer produktionslinie zur herstellung einer barrierebeschichteten faserbahn Active EP3919679B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20205568 2020-06-01

Publications (2)

Publication Number Publication Date
EP3919679A1 true EP3919679A1 (de) 2021-12-08
EP3919679B1 EP3919679B1 (de) 2023-06-21

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Application Number Title Priority Date Filing Date
EP21170096.8A Active EP3919679B1 (de) 2020-06-01 2021-04-23 Behandlungsabschnitt einer produktionslinie zur herstellung einer barrierebeschichteten faserbahn

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EP (1) EP3919679B1 (de)
CN (1) CN113756131A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723169A (en) * 1970-01-12 1973-03-27 Blandin Paper Co Process of coating paper
US20100051223A1 (en) * 2008-08-21 2010-03-04 Michael Trefz Apparatus to produce coated paper, cardboard or other fibrous webs with at least one thermo-sensitive layer and a method to operate an apparatus of this type
EP3286378B1 (de) 2015-04-20 2019-04-10 Kotkamills Group Oyj Verfahren und system zur herstellung von beschichteter pappe und beschichtete pappe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE515824C2 (sv) * 2000-01-26 2001-10-15 Tetra Laval Holdings & Finance Förfarande för tillverkning av ett flerskiktat förpackningslaminat genom våtbeläggning, samt laminat tillverkat enligt förfarandet
JP2013169989A (ja) * 2012-02-21 2013-09-02 Nippon Paper Industries Co Ltd 紙製バリア包装材料の製造方法
FI20175144L (fi) * 2017-02-17 2018-08-18 Valmet Technologies Oy Valmistuslinjan käsittelyosa barrier-päällystetyn kuiturainan valmistamiseksi ja käsittelymenetelmä barrier-päällystetyn kuiturainan valmistamiseksi

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723169A (en) * 1970-01-12 1973-03-27 Blandin Paper Co Process of coating paper
US20100051223A1 (en) * 2008-08-21 2010-03-04 Michael Trefz Apparatus to produce coated paper, cardboard or other fibrous webs with at least one thermo-sensitive layer and a method to operate an apparatus of this type
EP3286378B1 (de) 2015-04-20 2019-04-10 Kotkamills Group Oyj Verfahren und system zur herstellung von beschichteter pappe und beschichtete pappe

Also Published As

Publication number Publication date
EP3919679B1 (de) 2023-06-21
CN113756131A (zh) 2021-12-07

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