FI20205569A1 - Treatment method and treatment section for producing a barrier coated fiber web - Google Patents

Treatment method and treatment section for producing a barrier coated fiber web Download PDF

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Publication number
FI20205569A1
FI20205569A1 FI20205569A FI20205569A FI20205569A1 FI 20205569 A1 FI20205569 A1 FI 20205569A1 FI 20205569 A FI20205569 A FI 20205569A FI 20205569 A FI20205569 A FI 20205569A FI 20205569 A1 FI20205569 A1 FI 20205569A1
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FI
Finland
Prior art keywords
fiber web
curtain
treatment method
barrier
coating
Prior art date
Application number
FI20205569A
Other languages
Finnish (fi)
Swedish (sv)
Inventor
Henri Vaittinen
Mika Viljanmaa
Juha Kivimaa
Seppo Luomi
Original Assignee
Valmet Technologies Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to FI20205569A priority Critical patent/FI20205569A1/en
Publication of FI20205569A1 publication Critical patent/FI20205569A1/en

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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
    • D21H19/00—Coated paper; Coating material
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • 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

Abstract

The invention relates to a treatment method (150) of a production line (100) for producing a barrier coated fiber web in which treatment method one or both sides of the fiber web is/are provided by a barrier coating. The treatment method comprises stages of treatment in the following order: - sizing the fiber web by a sizing agent, - multilayer curtain coating in a multilayer curtain coater (30) comprising the stages of curtain coating in the following order: - applying a precoating layer onto the fiber web in a first curtain slot (31) of the multilayer curtain coater (30), - applying a barrier-coating layer onto the fiber web in a second curtain slot (32) of the multilayer curtain coater (30), - applying a heat-sealable coating layer onto the fiber web in a third curtain slot (33) of the multilayer curtain coater (30).

Description

Treatment method and treatment section for producing a barrier coated fiber web Technical field The invention relates to producing a barrier coated fiber web. Especially the invention relates to a treatment method according to the features of the preamble part of claim 1. The invention also relates to a treatment section according to the features of claim 8. Background As known from the prior art in fiber web producing processes typically comprise an assembly formed by a number of apparatuses arranged consecutively in the process line. 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 pre-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. In this description and the following claims by fiber webs are meant for example a paper and board webs.
N In production of fiber webs, for example of paper or board webs, sizing is used N to alter the properties of a fiber web by adding sizing substances, for example S starch. Sizing can be divided to internal sizing and surface sizing. In internal O sizing the sizing agent is added to pulp in the wet end of the fiber web machine z 30 before forming. In 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 O machine but the sizing substance can be added onto the fiber web at other S parts of the fiber web production line, also. The sizing of paper and board web typically utilize a separate sizer. In connection with the sizer different kinds of sizing technology are employed in prior art arrangements, for example pond sizing technology or film-transfer technology or spray sizing technology.
Coated fiber web grades and coating are becoming more and more popular and thus the coating process and equipment have increasing demands imposed thereon. In 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. In connection with the 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.
The 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. Thus these 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 N barrier functions.
N S In patent publication EP3286378B1 is disclosed a method for manufacturing O coated paperboard suitable for packaging paperboard applications, the z 30 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 O comprising inorganic mineral pigment particles and least one binder for sealing S 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 method for producing a barrier coated fiber web, in which problems and disadvantages of the treatment methods and methods known from prior art are eliminated or at least minimized. Another object of the present invention is to create an improved treatment method for producing a barrier coated fiber web, especially in view of producing a barrier coated fiber web with improved properties, in particular in — view of stiffness and strength. Summary In order to achieve the above mentioned and those later presented the treatment method according to the invention is mainly characterized by the features of the characterizing part of claim 1. The treatment section is mainly characterized by the features of the treatment section claim 8. Further advantageous embodiments and features of the invention are disclosed in the dependent claims.
S N According to the invention the treatment method for producing a barrier coated S fiber web, in which treatment method one or both sides of the fiber web is/are O provided by a barrier coating, wherein the treatment method comprises stages z 30 of treatment in the following order: > - Sizing the fiber web by a sizing agent in a sizer, O - multilayer curtain coating in a multilayer curtain coater comprising the stages S of curtain coating in the following order: - applying a precoating layer onto the fiber web in a first curtain slot of the multilayer curtain coater,
- applying a barrier-coating layer onto the fiber web in a second curtain slot of the multilayer curtain coater, - applying a heat-sealable coating layer onto the fiber web in a third curtain slot of the multilayer curtain coater.
Advantageously the sizing agent comprises native starch or modified starch or cationic starch, carboxyl methyl cellulose-based sizing agent, polyvinyl alcohol-based sizing agent, synthetic or bio-based polymer latex. Synthetic or bio-based polymer latex comprises advantageously e.g. styrene butadiene latex, polyvinyl acetate latex, acrylate latex, polyvinyl alcohol dispersion, polyolefin dispersion or any of their mixtures, copolymers, or derivatives thereof. The sizing agent advantageously also comprises different types of fillers, for example micro-fibrillated cellulose MFC, nano-fibrillated cellulose NFC, highly refined cellulose, or pigments (GCC, PCC, kaolin, talc).
According to an advantageous feature the sizing agent is applied in form of foam. Advantageously the substance for the pre-coating layer forms a runnability layer, which enhances properties of the fiber web for smooth and good runnability, and the substance of the pre-coating layer comprises surfactant 0,1 — 2 % and binder, advantageously for example starch, carboxyl methyl cellulose, polyvinyl alcohol, synthetic or bio-based polymer latex, with either inorganic pigment or not, and is advantageously applied in amount of 1-10 g/m2, advantageously 1-2 g/m2.
S N Advantageously the substance for barrier coating layer comprises synthetic or S bio-based polymer latex and mineral filler / pigments. Synthetic or bio-based O polymer latex comprises e.g. styrene butadiene latex, polyvinyl acetate latex, z 30 acrylate latex, polyvinyl alcohol dispersion, polyolefin dispersion or any of their > mixtures, copolymers, or derivatives thereof.
O
LO S Advantageously the heat-sealable coating layer with or without barrier N properties comprises synthetic or bio-based polymer latex with or without mineral filler / pigments. Synthetic or bio-based polymer latex is e.g. styrene butadiene latex, polyvinyl acetate latex, acrylate latex, polyvinyl alcohol dispersion, polyolefin dispersion or any of their mixtures, copolymers, or derivatives thereof. All coating compositions may include additives; thickening agents, de-foaming 5 /antifoaming agents, dispersing aids, additional pigments, crosslinking agents / insolubilizers, slip additives / lubricants, release agents and anti-blocking agents. Barrier coating weight (for one layer) (dry solids) is 3 — 20 g/m? advantageously 4 — 9 g/m? Heat-sealable coating (with or without barrier properties) weight (dry solids) is 3 — 20 g/m?, advantageously 6 — 9 g/m?. The sizing is advantageously provided by a pond size press, a film size press, a spray sizer or very advantageously by a nip sizer with curtain applicator(s) or foam applicator(s), which improves the smoothness and strength and provides a uniform coating layer, by which for example short or long fibers, fiber based fines, nano-cellulose based substances, lignin based substances, mineral pigments / fillers, nanofibers can be provided in connection with the sizing substance onto the fiber web.
In the treatment section according to the invention is applicable on-line or off- line in the production line for producing barrier coated fiber web. The sizing can be applied on one side of the fiber web or on both sides of the fiber web.
S N The coating substance layers can be applied on one side of the fiber web or S on both sides of the fiber web.
O z 30 The sizing agent can be applied directly onto the fiber web or in-directly by fist > applying the sizing agent onto a roll and via surface of the roll and then apply D the sizing agent onto the fiber web.
S N The coating substance layers can be applied directly onto the fiber web or in- directly by fist applying the coating substance onto a roll and via surface of the roll and then apply the coating substance onto the fiber web.
The treatment section for producing a barrier coated fiber web by the treatment method according to the invention comprises a sizer, a multilayer curtain coater comprising a first curtain slot, a second curtain slot and a third curtain slot. Advantageously the treatment section comprises a reel-up, and advantageously a slitter-winder and/or a roll packaging apparatus.
Advantageously the treatment section comprises cooling equipment, advantageously before the sizer and/or after the coater. Advantageously the treatment section comprises a calender, advantageously before and/or after the sizer, and/or before and/or after the coater. By the treatment method of a production line for producing a barrier coated fiber web and its advantageous features many advantages are achieved: The method provides cost savings in the production equipment compared to prior art as separate devices for precoating is not needed. Additionally, the multilayer curtain coating provides the possibility of altering layer thickness, which provides variety of possibilities in the barrier coating and further, thinner layer thickness can be used in multilayer curtain coating compared to using separate devices for the layers and thus, less coating substances and chemicals are needed. By the method according to the invention also a barrier N coated fiber web with improved properties, in particular in view of stiffness and N strength, is provided.
S
O E 30 — Brief description of the drawings
O O In the following the invention and its advantages are explained in greater detail S ooo in the sense of example and with reference to accompanying drawing, N where
Figure 1 shows schematically one advantageous example of a production line for barrier coated fiber webs.
Detailed description During the course of the following description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples.
In the figures some repetitive reference signs may have been omitted for clarity reasons.
In the example of figure 1 a 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). In the example of figure 1 the production line 100 comprises a treatment section 150. Before the treatment section 150 the production line 100 comprises a head box, a wire section (i.e. forming section), a press section and a drying section.
The treatment section 150 comprises a sizer 20 and drying equipment 25 for drying to the fiber web.
The sizer 20 is advantageously S 25 a pond size press, a film size press, a spray sizer or very advantageously a S nip sizer with curtain applicator(s) or a foam applicator(s). S The sizer 20 and its drying eguipment 25 is followed by a multilayer curtain O coater 30 for applying three coating substance layers onto the fiber web to E provide the barrier coating layer/-s onto one or both sides of the fiber web.
The o 30 multilayer curtain coater 30 comprises curtain coating slots 31, 32, 33 for D applying the barrier coating onto the fiber web.
The first curtain slot 31 is N configured to apply a precoating layer onto the fiber web, the second curtain N slot 32 is configured to apply a barrier-coating layer onto the fiber web and the third curtain slot 33 is configured to apply a heat-sealable coating layer onto the fiber web.
After the multilayer curtain coater 30 drying equipment 35 are located for drying the fiber web. After the treatment section 150 the production line 100 may comprise other equipment 40 for treatment of the fiber web, a reel-up for reeling the fiber web to a parent roll, a slitter-winder for slitting and winding the fiber web to customer rolls, a roll packaging apparatus for packing the customer rolls. In connection with the treatment section also cooling equipment may be provided, for example before the sizer and/or after the coater 30, for cooling the fiber web. Additionally, the treatment section 150 may comprise a calender, for example before and/or after the sizer 20, and/or before and/or after the coater 30, for calendering the fiber web.
In production of the fiber web in the production line 100 in the pre-treatment section part 10 from the head box pulp is fed onto the wire section (i.e. forming section), in which water is removed from the pulp by water removal means. In the press section water is further removed by pressing the fiber web in press nips and/ or in shoe — or belt nips. In the subsequent drying section, the fiber — web is dried, typically by contact drying by leading the fiber web to run in contact over heated surfaces of drying cylinders.
In the treatment section 150 in the sizer 20 sizing agent is applied onto the fiber web and thereafter the fiber web is dried by following drying eguipment
25.
Inthe multilayer curtain coater 30 in the curtain coating sections 31, 32, 33 the barrier coating is applied onto the fiber web. In the first curtain slot 31 a precoating layer is applied onto the fiber web. In the second curtain slot 32 is a barrier-coating layer is applied onto the fiber web. In the third curtain slot 33 o a heat-sealable coating layer is applied onto the fiber web. After the multilayer a 25 curtain coater 30 the fiber web and the barrier coating is dried by the drying S eguipment 35. O After the treatment section 150 the fiber web may be still treated by other E eguipment 40 for treatment of the fiber web, reeled in to a parent roll in a reel- o up, formed to customer rolls in a slitter-winder, which customer rolls may be D 30 packed for transportation in a roll packaging apparatus. In connection with the N treatment section also cooling eguipment may be provided, for example before N the sizer 20 and/or after the coater 30, for cooling the fiber web. Additionally, the treatment section 150 may comprise a calender, for example before and/or after the sizer 20, and/or before and/or after the coater 30, for calendering the fiber web. In the description in the foregoing, although some functions and elements have been described with reference to certain features and examples, those functions and elements may be performable by other features and examples whether described or not. Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples whether described or not.
Above only some advantageous examples of the inventions have been described to which examples the invention is not to be narrowly limited and many modifications and alterations are possible within the invention.
O QA O N
O <Q
O
I a a
O O LO LO O QA O N

Claims (11)

Claims
1. Treatment method for producing a barrier coated fiber web, in which treatment method one or both sides of the fiber web is/are provided by a barrier coating, characterized in that the treatment method comprises stages of treatment in the following order: - sizing the fiber web by a sizing agent in a sizer (20), - multilayer curtain coating in a multilayer curtain coater (30) comprising the stages of curtain coating in the following order: - applying a precoating layer onto the fiber web in a first curtain slot (31) of the multilayer curtain coater (30), - applying a barrier-coating layer onto the fiber web in a second curtain slot (32) of the multilayer curtain coater (30), - applying a heat-sealable coating layer onto the fiber web in a third curtain slot (33) of the multilayer curtain coater (30).
2. Treatment method according to claim 1, characterized in that the sizing agent comprises native starch or modified starch or cationic starch, carboxyl methyl cellulose-based sizing agent, polyvinyl alcohol-based sizing agent, synthetic or bio-based polymer latex.
3. Treatment method according to claim 2, characterized in that the synthetic or bio-based polymer latex comprises e.g. styrene butadiene latex, polyvinyl acetate latex, acrylate latex, polyvinyl alcohol dispersion, polyolefin dispersion or any of their mixtures, copolymers, N or derivatives thereof.
N S
4. Treatment method according to claim 2 or 3, characterized in that the O sizing agent comprises different types of fillers, for example micro- z 30 fibrillated cellulose MFC, nano-fibrillated cellulose NFC, highly refined > cellulose, or pigments (GCC, PCC, kaolin, talc).
O
LO S
5. Treatment method according to any of claims 1-4, characterized in that N the substance for the pre-coating layer forms a runnability layer, and comprises surfactant 0,1 — 2 % and binder, and is advantageously applied in amount of 1-10 g/m2, advantageously 1-2 g/m2.
6. Treatment method according to any of the previous claims, characterized in that the substance for barrier coating layer comprises synthetic or bio-based polymer latex and mineral filler / pigments.
7. Treatment method according to any of the previous claims, characterized in that the heat-sealable coating layer with or without barrier properties comprises synthetic or bio-based polymer latex with or without mineral filler / pigments, advantageously the synthetic or bio- based polymer latex comprises e.g. styrene butadiene latex, polyvinyl acetate latex, acrylate latex, polyvinyl alcohol dispersion, polyolefin dispersion or any of their mixtures, copolymers, or derivatives thereof.
8. Treatment section for producing a barrier coated fiber web by the treatment method according to any of claims 1-7, wherein the treatment section comprises a sizer (20), a multilayer curtain coater (30) comprising a first curtain slot (31), a second curtain slot (32) and a third curtain slot (33).
9. Treatment section according to claim 8, wherein the treatment section comprises a reel-up, and advantageously a slitter-winder and/or a roll packaging apparatus.
10. Treatment section according to claim 8 or 9, wherein the treatment section comprises cooling equipment, advantageously before the sizer N (20) and/or after the coater (30).
N S
11. Treatment section according to any of claims 8 - 10, wherein the O treatment section comprises a calender, advantageously before and/or E 30 after the sizer (20), and/or before and/or after the coater (30).
O
LO
S
N
FI20205569A 2020-06-01 2020-06-01 Treatment method and treatment section for producing a barrier coated fiber web FI20205569A1 (en)

Priority Applications (1)

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FI20205569A FI20205569A1 (en) 2020-06-01 2020-06-01 Treatment method and treatment section for producing a barrier coated fiber web

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FI20205569A1 true FI20205569A1 (en) 2021-04-01

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