FI20205570A1 - Treatment method and a treatment section for producing a barrier coated fiber web - Google Patents
Treatment method and a treatment section for producing a barrier coated fiber web Download PDFInfo
- Publication number
- FI20205570A1 FI20205570A1 FI20205570A FI20205570A FI20205570A1 FI 20205570 A1 FI20205570 A1 FI 20205570A1 FI 20205570 A FI20205570 A FI 20205570A FI 20205570 A FI20205570 A FI 20205570A FI 20205570 A1 FI20205570 A1 FI 20205570A1
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- Prior art keywords
- fiber web
- coating
- curtain
- coater
- treatment
- Prior art date
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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
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- Paper (AREA)
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: pre-coating the fiber web by a pre-coating substance, multilayer curtain coating in a multilayer curtain coater (30) comprising the stages of curtain coating in the following order: applying a barrier-coating layer onto the fiber web in a first curtain section (31) of the multilayer curtain coater (30), applying a sub-coating layer onto the fiber web in a second curtain section (32) of the multilayer curtain coater (30), applying a heat-sealable coating layer onto the fiber web in a third curtain section (31) of the multilayer curtain coater (30).
Description
Treatment method and a 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 6. 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 30 sizing the sizing agent is added to pulp in the wet end of the fiber web machine z 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 5 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 barrier functions.
S N In patent publication EP3286378B1 is disclosed a method for manufacturing S coated paperboard suitable for packaging paperboard applications, the O 30 method comprising coating a first surface of the paperboard web by applying z a first coating composition in a precoating unit for forming a precoating layer > comprising inorganic mineral pigment particles and least one binder for sealing 5 the first surface of the paperboard web, weight of the precoating layer being S less than 30 g/m<2> , and a second coating composition in form of an aqueous N 35 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.
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 6. Further advantageous embodiments and features of the invention are disclosed in the dependent claims.
According to the invention the 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, wherein the treatment method comprises stages of treatment in the following order: - precoating the fiber web by a precoating substance, - multilayer curtain coating in a multilayer curtain coater comprising the stages N of curtain coating in the following order: N - applying a barrier-coating layer onto the fiber web in a first curtain S section of the multilayer curtain coater, O 30 - applying a sub-coating layer onto the fiber web in a second curtain z section of the multilayer curtain coater, > - applying a heat-sealable coating layer onto the fiber web in a third 5 curtain section of the multilayer curtain coater.
S N 35 According to an advantageous feature of the invention the precoating substance comprises binder; advantageously starch, carboxy methyl cellulose (CMC), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA) or synthetic or bio-
based polymer latex, with mineral pigments and/or fillers, micro-fibrillated cellulose (MFC), nano-fibrillated cellulose (NFC), or mixture of those.
According to an advantageous feature the amount of precoating substance is 6-20 g/m?. According to an advantageous feature of the invention the substance for barrier coating layer comprises synthetic or bio-based polymer latex and mineral filler / pigments.
Advantageously the 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.
According to an advantageous feature of the invention the sub-coating layer comprises as a main component organic binder, advantageously starch.
Advantageously the sub-coating layer comprises mineral pigments or fillers, micro-fibrillated cellulose (MFC), nano-fibrillated cellulose (NFC). The sub-coating layer increases the volume flow, whereby also small amounts of coating can be applied by curtain coating and thus the possibilities of curtain coating running window is widened.
The sub-coating layer also functions as a support layer, whereby use of the more expensive substances in the barrier and/or heat-sealable layers can be minimized.
Additionally, the sub-coating layer prevents blending and migration of the barrier coating layer and the heat- sealable layer, as well as prevents reactions of the substances of the barrier coating layer and the heat-sealable layer with each other. advantageously substance of the sub-coating layer is of lesser quality and thus, cost savings N are achieved. & S According to an advantageous feature the amount of the sub-coating layer is O 30 1-10 g/m? advantageously 2-4 g/m. = > Advantageously the heat-sealable coating layer with or without barrier 5 properties comprises synthetic or bio-based polymer latex with or without S 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 / antifoaming agents, dispersing aids, additional pigments, crosslinking agents / insolubilizers, slip additives / lubricants, release agents and anti-blocking 5 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 pre-coating is advantageously provided by a coater based on film transfer, blade, curtain, curtain and nip rolls, spray, spray and nip rolls, foam coating technology. 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 coating substance layers can be applied on one side of the fiber web or on both sides of the fiber web.
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 pre-coater, a multilayer curtain N coater comprising a first curtain slot, a second curtain slot and a third curtain N slot.
S o 30 Advantageously the treatment section comprises a reel-up, and E advantageously a slitter-winder and/or a roll packaging apparatus. S Advantageously the treatment section comprises cooling equipment,
LO S advantageously before the pre-coater and/or after the coater. & 35 Advantageously the treatment section comprises a calender, advantageously before and/or after the pre- coater, 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 is not needed especially in view of the need for drying the barrier coated fiber web after treatment in the multilayer curtain coater.
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.
Brief description of the drawings
In the following the invention and its advantages are explained in greater detail below in the sense of example and with reference to accompanying drawing, 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 N used to identify like elements according to the different views which illustrate N the invention and its advantageous examples.
In the figures some repetitive S reference signs may have been omitted for clarity reasons. o 30 z 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 5 that the actual production line for the barrier coated fiber web product S 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 pre-coater 20 and drying equipment 25 for drying to the fiber web. The pre-coater 20 is advantageously a coater based on film transfer, blade, curtain, curtain and nip rolls, spray, spray and nip rolls, foam coating technology.
The pre-coater 20 and its drying equipment 25 is followed by a multilayer curtain coater 30 for applying three coating substance layers onto the fiber web to provide the barrier coating layer/-s onto one or both sides of the fiber web. The multilayer curtain coater 30 comprises curtain coating slots 31, 32, 33 for applying the barrier-coating onto the fiber web. The first curtain slot 31 is configured to apply a barrier layer onto the fiber web, the second curtain slot 32 is configured to apply a sub-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. After the treatment section 150 the production line 100 may comprise other equipment for treatment of the fiber web, a reel-up, a slitter-winder, a roll packaging apparatus and/or cooling equipment.
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 o 25 the press section water is further removed by pressing the fiber web in press a nips and/ or in shoe — or belt nips. In the subseguent drying section, the fiber S web is dried, typically by contact drying by leading the fiber web to run in S contact over heated surfaces of drying cylinders. E In the treatment section 150 in the pre-coater 20 pre-coating substance is o 30 applied onto the fiber web and thereafter the fiber web is dried by following 5 drying equipment 25.
O O In the multilayer curtain coater 30 in the curtain coating slots 31, 32, 33 the barrier coating is applied onto the fiber web. In the first curtain slot 31 a barrier- coating layer is applied onto the fiber web. In the second curtain slot 32 is a sub-coating layer is applied onto the fiber web. In the third curtain slot 33 a heat-sealable coating layer is applied onto the fiber web. After the multilayer curtain coater 30 the fiber web and the barrier coating is dried by the drying equipment 35.
After the treatment section 150 the fiber web may be still treated by other equipment for treatment of the fiber web, reeled in to a parent roll in a reel-up, formed to customer rolls in a slitter-winder, which customer rolls may be packed for transportation in a roll packaging apparatus.
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.
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Claims (9)
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: - pre-coating the fiber web by a pre-coating substance, - multilayer curtain coating in a multilayer curtain coater (30) comprising the stages of curtain coating in the following order: - applying a barrier-coating layer onto the fiber web in a first curtain section (31) of the multilayer curtain coater (30), - applying a sub-coating layer onto the fiber web in a second curtain section (32) of the multilayer curtain coater (30), - applying a heat-sealable coating layer onto the fiber web in a third curtain section (31) of the multilayer curtain coater (30).
2. Treatment method according to claim 1, characterized in that the pre- coating substance comprises binder; advantageously starch, carboxy methyl cellulose (CMC) polyvinyl alcohol (PVOH), polyvinyl acetate (PVA) or synthetic or bio-based polymer latex, with mineral pigments and/or fillers, micro-fibrillated cellulose (MFC), nano-fibrillated cellulose (NFC), or mixture of those
3. Treatment method according to any of the previous claims, characterized in that the substance for the barrier coating layer comprises synthetic or bio-based polymer latex and mineral filler / S pigments. S
4. Treatment method according to any of the previous claims, O 30 characterized in that the substance for the sub-coating layer comprises z as a main component organic binder, advantageously starch and > advantageously the sub-coating layer comprises also mineral pigments 5 or fillers, micro-fibrillated cellulose (MFC), nano-fibrillated cellulose 3 (NFC).
5. 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.
6. Treatment section for producing a barrier coated fiber web by the treatment method according to any of claims 1-5, 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).
7. Treatment section according to claim 6, wherein the treatment section comprises a reel-up, and advantageously a slitter-winder and/or a roll packaging apparatus.
8. Treatment section according to claim 6 or 7, wherein the treatment section comprises cooling equipment, advantageously before the pre- coater (20) and/or after the coater (30).
9. Treatment section according to any of claims 6 - 8, wherein the treatment section comprises a calender, advantageously before and/or after the pre-coater (20), and/or before and/or after the coater (30).
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20205570A FI20205570A1 (en) | 2020-06-01 | 2020-06-01 | Treatment method and a treatment section for producing a barrier coated fiber web |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20205570A FI20205570A1 (en) | 2020-06-01 | 2020-06-01 | Treatment method and a treatment section for producing a barrier coated fiber web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FI20205570A1 true FI20205570A1 (en) | 2021-04-01 |
Family
ID=76070057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI20205570A FI20205570A1 (en) | 2020-06-01 | 2020-06-01 | Treatment method and a treatment section for producing a barrier coated fiber web |
Country Status (1)
| Country | Link |
|---|---|
| FI (1) | FI20205570A1 (en) |
-
2020
- 2020-06-01 FI FI20205570A patent/FI20205570A1/en not_active Application Discontinuation
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| FD | Application lapsed |