WO2007048878A1 - Papier multicouche et son procede de preparation - Google Patents
Papier multicouche et son procede de preparation Download PDFInfo
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- WO2007048878A1 WO2007048878A1 PCT/FI2006/050460 FI2006050460W WO2007048878A1 WO 2007048878 A1 WO2007048878 A1 WO 2007048878A1 FI 2006050460 W FI2006050460 W FI 2006050460W WO 2007048878 A1 WO2007048878 A1 WO 2007048878A1
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- WO
- WIPO (PCT)
- Prior art keywords
- paper
- layer
- coating
- coated
- opacity
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 63
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- 239000000049 pigment Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000005507 spraying Methods 0.000 claims abstract description 31
- 239000003086 colorant Substances 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000000123 paper Substances 0.000 claims description 208
- 239000010410 layer Substances 0.000 claims description 76
- 238000007639 printing Methods 0.000 claims description 29
- 239000011247 coating layer Substances 0.000 claims description 18
- 239000012463 white pigment Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 11
- 238000003490 calendering Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000004606 Fillers/Extenders Substances 0.000 claims description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims description 6
- 239000000975 dye Substances 0.000 claims description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000005995 Aluminium silicate Substances 0.000 claims description 5
- 235000012211 aluminium silicate Nutrition 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- -1 reinforcements Substances 0.000 claims description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 2
- RREGISFBPQOLTM-UHFFFAOYSA-N alumane;trihydrate Chemical compound O.O.O.[AlH3] RREGISFBPQOLTM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003139 biocide Substances 0.000 claims description 2
- 239000001045 blue dye Substances 0.000 claims description 2
- 239000001055 blue pigment Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 2
- 239000000654 additive Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000011087 paperboard Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 239000001034 iron oxide pigment Substances 0.000 description 1
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
-
- 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
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
- D21H21/14—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 characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
- D21H21/285—Colorants ; Pigments or opacifying agents insoluble
-
- 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
- D21H23/50—Spraying or projecting
Definitions
- the present invention relates to a multi-layered paper, and more particularly to a high opacity paper.
- the present invention further concerns a process for preparing multi- layered paper and to the use of spray coating for applying an opacity layer on paper.
- the printing and writing paper grades comprises newsprint, uncoated mechanical papers, which are mainly supercalandered (SC), coated mechanical papers, which are mainly light weight coated (LWC), uncoated woodfree papers and coated woodfree grades.
- SC supercalandered
- LWC light weight coated
- Newsprint is made largely from mechanical pulp and/or waste paper, with or without a small amount of filler.
- Newsprint is mainly used for newspaper manufacture, approximately 80%, and almost exclusively in reels. Recovered paper use in furnish has increased dramatically during the last decade.
- Uncoated mechanical papers mainly supercalandered (SC) papers
- SC supercalandered
- Stable quality a smooth printing surface for four color printing, and good runnability are the most important quality characteristics.
- Printing methods are offset and rotogravure.
- Coated mechanical papers mainly light weight coated (LWC) papers, find the same uses as SC papers and also mainly in reels. High brightness is an additional quality factor for these papers.
- the printing methods are the same as for SC papers.
- Coated woodfree papers are for high quality four color printing such as books, brochures, advertising materials and magazines. Two-thirds of the consumption is sheets and the remainder is in reels.
- the uncoated woodfree papers are used for printing and copying paper (e.g. A4), offset printing for books and brochures, continuous forms, etc. High brightness, stable quality and good formation are the most important quality requirements.
- Uncoated woodfree paper is normally uncoated woodfree paper, which is suitable for printing or other graphic purposes, where at least 90% of the fibre furnish consists of chemical pulp fibres.
- Uncoated woodfree paper can be made from a variety of furnishes, with variable levels of mineral filler and a range of finishing processes such as sizing, calendering, machine-glazing and watermarking. This grade includes most office papers, such as business forms, copier, computer, stationery and book papers. Pigmented roll coated "coated" papers (coating > 6 g/m2 per side ) are covered by this heading.
- coated papers are all paper suitable for printing or other graphic purposes and coated on one or both sides with minerals such as china clay (kaolin), calcium carbonate, etc. Coating may be done by a variety of methods, both on-machine and off-machine, and may be supplemented by super-calendering.
- Paper is distinguished from board or paperboard primarily on basis weight.
- the term “paper” is generally applied to sheets having basis weights of 20 to 170 g/m 2 while the term “board” or “paperboard” refers to basis weights of 130 to 450 g/m 2 .
- Medium weight papers have a basis weight normally between 40 - 120 g/m 2 and light weight papers have basis weight normally less than 40 g/m 2 .
- Paper has to fulfill certain requirements such as low basis weight, bulk, high whiteness, high opacity and the right surface ink absorbency properties. The set quality specifications are a compromise of these parameters. In paper manufacturing attention should be paid to visual out look of the paper in terms of brightness, shade, surface evenness and opacity. Also paper surface absorbency properties should match the printing process in question so that the penetration of ink into the paper surface is optimal from a quality and cost point of view.
- the base paper added with one layer on each side, so called sized paper, consisting of the base paper and a layer of chemicals, like starch;
- the base paper added with one layer on each side of the paper, so called coated paper, consisting of the base paper and a layer of chemicals and white pigment, in which case the chemical act as a binder of the white pigment on to the paper; and
- double coated paper a base paper with two coated layers on each side, called double coated paper.
- the additional white pigment layer improves whiteness and opacity, all other conditions remaining substantially unchanged.
- the multi-layered coating contains at least two layers.
- the first layer contains both dark colorant and white pigment.
- the second layer contains at least one pigment other than a dark colorant, such as a white or near white pigment.
- High opacity coated papers are used in various applications for which the paper must be printable and for which it is essential that the opacity of said paper is higher than the opacity of conventional coated papers with a comparable weight per square meter. It is known to make ultra opacity sheets by coating, traditionally using air-knife coaters, trailing-blade coaters or metering-bar coaters, at least one of the two faces of a three-ply paper support. The central ply of a three-ply support has a grey paper composition, which introduces ultra opacity by absorption of light.
- This central ply is surrounded by two plies with a white paper composition such that the assembly of each white ply supporting one or more white coats makes the ultra opaque sheet look white and uniform.
- a white paper composition such that the assembly of each white ply supporting one or more white coats makes the ultra opaque sheet look white and uniform.
- US 2005/0158570 discloses an ultra opaque coated sheet such as playing card, comprising a colored support made from a single ply of material (paper or plastic), the said support being coated on at least one of its faces with one or more white pigmented coats. Also a manufacturing process of this ultra opaque coated sheet is disclosed. According to this process opacification can be obtained by depositing a precoat of opacifying pigments using a curtain coating device on the paper surface.
- the poor opacity is also present in printing and writing papers. It is obvious for a man skilled in the art that opacity can be improved by increasing the thickness of the paper i.e. increasing the grammage. Therefore higher grammage paper is used in these applications these days. However, the recent increase in transportation and mailing costs requires the development and use of lighter weight printing and writing papers.
- One of the main aspects of this invention is paper quality and especially a manufacturing stage aimed to improve and control printing and writing paper opacity.
- the invented method is suitable for manufacturing coated sheets with higher opacity.
- These high opacity papers can be used in various applications for which the sheets must be printable and for which it is advantageous that the opacity of said sheets be higher than the opacity of conventional coated sheets with a comparable weight per square meter.
- the produced multilayer paper has unique properties. It is an advantage of the method of the invention that the paper can be produced at lower or at least at competitive costs compared to any other coated paper of today, while at the same time the opacity of said paper is higher than the opacity of conventional coated papers with a comparable weight per square meter.
- Opacity is an optical property of the paper. It is a measure of the degree to which paper transmits light. A paper with low opacity allows more light to pass through the paper, a paper with high opacity allows less light to pass through the paper. Opacity characterizes the ability of paper to hide text or pictures on the back side of the sheet. Opacity characterizes the ability of a single sheet to hide the background. Practically, the opacity determines how much of the image on the opposite side of the paper is shown through on the other side. When light hits a paper surface, a fraction of the intensity reflects back, and the remainder enters the sheet.
- Reflectance measurements can determine the reflected, transmitted, and absorbed intensities.
- International standards specify the procedures for the reflectance measurements including the spectral characteristics of the incident light, the standards for the calibration of the instruments, and the measurement geometry.
- opacity layer Most opacity problems experienced by papermakers involve the visibility of images printed onto the reverse sides or subsequent sheets of a magazine, newspaper, or book.
- This invention provides a new paper structure, which is constructed in layers and one layer is specifically aimed to improve opacity. This layer is called an "opacity layer”.
- the present invention provides as a first aspect multi-layered paper, which comprises a base paper, a first layer and a second layer, wherein the first layer is an opacity layer comprising one or more dark colorants spray coated on at least one of the faces of the base paper, and the second layer comprises one or more white or near white pigments coated on the first layer.
- the invention provides process for preparing a multi-layered paper.
- the process comprises providing a base paper, spraying a first layer of one or more dark colorants on at least one face of the base paper to form an opacity layer, and coating said first layer with a second layer of one or more white or near white pigments.
- the invention provides the use of spray coating for applying an opacity layer on paper.
- Figure 1 illustrates a diagrammatic section of a multi-layered paper according to this invention
- Figure 2a illustrates a diagrammatic view of a two-sided coating station
- Figure 2b illustrates a diagrammatic view of a coating station with a doctoring blade
- Figure 2c illustrates a diagrammatic view of a double coating station with an infrared dryer.
- Figure 1 illustrates a multi-layered paper (1), which comprises a base paper (2), a first layer (3) and a second layer (4), wherein the first layer (3) is an opacity layer comprising one or more dark colorants spray coated on at least one of the faces of the base paper (2), and the second layer (4) comprises one or more white or near white pigments coated on the first layer (3).
- the base paper (2) comprises pigments and mechanical pulp, chemical pulp, recycled paper or mixtures thereof.
- the base paper (2) is non-colored, thus the pigments used in the base paper are white or near white pigments.
- the coating of first (3) and second (4) layers is preferable done on both sides of the base paper (2).
- the paper basis weight and bulk can be adjusted over a wide range, depending on mass flow, raw material used and calendering.
- This invention is especially related to multi-layered paper having basis weights (grammage) of 20 to 120 g/m 2 , specifically less than 100 g/m 2 and more specifically 70 g/m 2 or less.
- This invention is especially related to multi-layered printing and writing paper, which is used for printing.
- the paper according to the invention is preferable a news, magazine, printing or writing paper.
- Total visual outlook of the printed image is a function both of the outlook of the paper and the printed image on the paper, text or pictures.
- the outlook of the printed paper has to be even, sharp and there has to be a good contrast between paper and printed image.
- the invention further relates to a process for preparing multi-layered paper, comprising providing a base paper, spraying a first layer of one or more dark colorants on at least one face of the base paper to form an opacity layer, and coating said first layer with a second layer of one or more white or near white pigments.
- Spray coating allows applying a coating layer with exact weight and thickness without having a reverse effect on production efficiency. Further, the spray can be applied in one or several layers.
- the advantage of spray coating is that the coating layer can be applied at desired amounts, for example from 1 g/m 2 to 15 g/m 2 . Especially the coating layer is applied in amounts 2 g/m 2 to 12 g/m 2 , more specifically from 3 g/m 2 to 10 g/m 2 , and most specifically from 4 g/m 2 to 8 g/m 2 .
- spray coating refers to coating that is done by using a spray coater.
- spray coater or “spray box” (5) used herein refers to an apparatus suited for applying coating to the surface of a web from a plurality of spray nozzles adapted over the cross-machine width of the web by way of spraying coating material under pressure via the nozzles onto the web.
- the spray nozzles are adapted in multiple rows at desired points along the web travel, spaced apart from each other at desired distances.
- the nozzles may be located in plural rows that are advantageously adapted into a hood serving to prevent at least a major portion of the coating mixture mist from escaping to the surroundings.
- a layer of dark colorant is applied on the base paper surface by spraying, with the specific purpose of controlling opacity.
- the dark colorant can be sprayed on the base paper one side or both sides, simultaneously or as two separate stages.
- a dark colorant e.g., a dark pigment and/or a dark dye
- the dark colorant can be a dye and/or pigment.
- the dark colorant can be a white pigment that has been dyed with a dark dye before applying onto the paper.
- the dark colorant might be formed from a white pigment and a dye, preferably the dark colorant used in this invention does not contain any white or near white pigments at the time it is applied onto the base paper.
- the dark colorant can be composed of single particles like black iron oxide pigments.
- the dark colorant can also be structured single aggregate pigments as in carbon black pigments. Further, the dark colorant can be a mixture of single particles, structured pigments and dyes. Examples of dark colorants include, but are not limited to, carbon- containing pigments, iron oxide, and black or blue pigments or dyes.
- the carbon- containing pigments include carbon black (e.g., furnace and channel black), graphite, vitreous carbon, activated charcoal, activated carbon, and mixtures thereof.
- the surface is coated with a second coating layer containing white or near white pigments to achieve desired level of whiteness and desired level of paper absorbency properties for ink hold-out of the paper.
- the term "white pigment” can also encompass near white pigments as well.
- these white or near white pigments have a fine particle size and can be inorganic or organic.
- inorganic pigments include, but are not limited to, kaolin, finely ground natural calcium carbonate, precipitated calcium carbonate, calcined kaolin, titanium dioxide, aluminum trihydrate, talc, calcium sulfate (gypsum), precipitated silica, calcined clay, and the like.
- Organic pigments include, but are not limited to, styrene polymers, urea-formaldehyde resins and the like.
- an extender is also preferably used, such as kaolin or calcium carbonate.
- other white or near white pigments may be used to "extend" the effect of the higher cost pigment.
- These other white pigments are referred to herein as extenders, and may be functionally defined as any white or near white pigment (as defined above).
- the extender can be used entirely; that is, in cases where the extender is able to completely eliminate the need for more expensive white pigments, such as titanium dioxide. Any extender commonly used by those skilled in the art in coatings for paperboard and paper can be used as the white or near white pigment.
- both the first and the second layer are applied by spray coating.
- the first coating layer Prior to the coating of the second layer, the first coating layer has to achieve a sufficient dryness.
- the applied layer of dark colorant must carry the following layer of white pigments without migration of the layers into each other. It is important that the two layers are not mixed into one layer, as the two layers have distinctively different purposes.
- Non contacting dryer such as infrared dryer, is preferably used for drying.
- Figure 2c illustrates a diagrammatic view of a double coating station with an infrared dryer (8).
- the manufacturing stage for forming opacity layer in the process according to this invention can be applied on-line with the paper machine. Alternatively this may be done as a separate off-line stage, before coating with white pigments for whiteness and surface properties.
- the coating stations can be either on-line with the paper machine or installed as off-line coating.
- the coating of the first and/or second layer is done in coating stations, which are installed on-line with the paper machine.
- the coating of the first layer is done online with the paper machine and the coating of the second layer is done off-line.
- the coated paper can be calendered after the first and/or second coating layer has been applied. Although the paper can be machine calendered after the first coating layer has been applied, normally calendaring is done only after the second coating layer has been applied.
- the coated paper can also be super-calendered. In one embodiment of the invention, the first coating layer is applied on the paper and the coated paper is machine calendered on-line with the paper machine, and then off-line, the paper is coated with the second coating layer and super-caledenred. It is also possible to apply further coatings on top of the second coating layer and then super-calender the coated paper.
- gloss is the intensity ratio of specularly reflected light to the incident light.
- specular reflection occurs in the surface layer of paper because light that enters the sheet undergoes many reflections and loses directionality. Gloss therefore strongly depends on the surface smoothness or roughness of paper.
- Instruments for measuring gloss have a fixed angle for the incident and the reflected light direction. The nominal angle is usually 75°.
- the coated paper can further processed into news, magazine, printing or writing paper, especially to copy paper, computer paper or book paper.
- the multilayered paper, comprising the first and the second coating layers is further coated with one or more coating layers.
- the surface of the coated layer can be doctored (Fig. 2b) by using a doctoring unit (7) to create an even surface suitable for rotogravure.
- the coating can be done without doctoring (Fig. 2a).
- the doctoring unit (7) can be a traditional doctoring blade, a smoothner, an air knife or air brush or any combination of these.
- the smoothing of the the coating surface can also be done in combination of doctoring and passing between two rolls. In one embodiment of the invention (Fig. 2c), the doctoring is done only after the second coating.
- spray coating methods permit coating application to a paper web at any point of a papermaking machine or coater. It is also possible that the spray boxes (5) are installed on opposite sides of the paper web (Fig. 2a), which allows simultaneous coating of both sides of the paper.
- the spray coaters can be located on the press or dryer sections of the machine, whereby the length dimension of the machine will not become substantially longer. Therefore the method is especially suitable for multilayer coating.
- spray coating allows the production of the base sheet from a cheaper stock of lower strength without essentially compromising the end product quality. Inasmuch this coating method is free from streaking that typically is a handicap of other methods by occurring during coat smoothing and metering, it also permits the use of filler-grade calcium carbonate that is cheaper than coating-grade calcium carbonate. In the spray coating method, the penetration of binder into the base web is minimal thus leaving the pigment or size particles onto the web surface.
- the spray coating method is capable of controlling the porosity and absorbency properties of the web surface in a fashion not offered by other application techniques. This is possible, because the amount of coating can be controlled very exactly.
- the coat weight becomes uniform over the entire area of the web irrespective of deviations in the web profile, thus making it possible to apply an equal amount of coating on both the valleys and the crests of the profile. Improved brightness and opacity result from the uniform coat.
- spray coating does not force the coating pigment particles into the interior structure of the base sheet fiber matrix, the consumption of coating furnish is smaller.
- a spray coating system provides: a good quality of applied coat, is capable of controlling the porosity of the web surface, and allows a wide range of applicable coat weights and the use of cheaper raw materials.
- the spray-coating system is suitable for use at high web speeds, it does not force the coating pigment particles into the interior structure and as compared with conventional coating methods spray coating is easier to implement and involves lower investment costs.
- spray coating can be performed to a base sheet whose moisture content is higher and, hence, whose strength is lower than what has been acceptable earlier.
- the qualities of spray coated paper are different from those of paper grades manufactured using conventional coating methods.
- spray coating method can be used for producing novel grades of paper.
- binders and dispersants that are traditionally used in coatings used for paper can also be present.
- the binder is present in an amount sufficient to bind the pigments to the substrate.
- binders include, but are not limited to, starch or latex.
- Suitable dispersing aids include but are not limited to, polyacrylates, polyphosphates, or other conventional dispersion aids.
- Other ingredients which can be present include thickeners, surfactants, biocides, defoamers, binder insolubilizers, lubricants and other ingredients that modify the properties of the coating color or the dry coating on the sheet.
- the types and amounts of each of these components that can be optionally present are known to or can be readily determined by those skilled in the art and these types and amounts of components can be used in the coatings of the present invention.
- the multi-layered paper according to the invention has opacity, which is higher than the opacity of conventional coated paper with a comparable weight per square meter.
Landscapes
- Paper (AREA)
Abstract
La présente invention a trait à un papier multicouche comportant un papier de base, une première couche et une deuxième couche. La première couche est une couche d'opacité comportant un ou des colorants sombres revêtus par pulvérisation sur au moins une des faces du papier de base, et la deuxième couche comporte un ou des pigments blanc cassés revêtus sur la première couche. L'invention a également trait à un procédé pour la préparation d'un papier multicouche. Le procédé comprend la mise à disposition d'un papier de base, la pulvérisation d'un ou de plusieurs colorants sombres sur au moins une face du papier de base pour former une couche d'opacité, et le revêtement de ladite première couche avec une deuxième couche d'un ou de plusieurs pigments blanc cassé.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06808001A EP1941100A4 (fr) | 2005-10-26 | 2006-10-25 | Papier multicouche et son procede de preparation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20055576 | 2005-10-26 | ||
FI20055576A FI20055576L (fi) | 2005-10-26 | 2005-10-26 | Monikerrospaperi ja menetelmä sen valmistamiseksi |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007048878A1 true WO2007048878A1 (fr) | 2007-05-03 |
Family
ID=35185282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2006/050460 WO2007048878A1 (fr) | 2005-10-26 | 2006-10-25 | Papier multicouche et son procede de preparation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1941100A4 (fr) |
FI (1) | FI20055576L (fr) |
WO (1) | WO2007048878A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090068389A1 (en) * | 2007-09-07 | 2009-03-12 | Maule Alan W | Block out label, label sheet, and related method |
WO2009040471A2 (fr) * | 2007-09-27 | 2009-04-02 | Metso Paper, Inc. | Procédé et dispositif pour recouvrir une bande de matériau fibreux d'au moins deux couches de revêtement |
WO2009042371A1 (fr) * | 2007-09-28 | 2009-04-02 | Avery Dennison Corporation | Étiquette opacifiante |
WO2009108506A1 (fr) * | 2008-02-19 | 2009-09-03 | Meadwestvaco Corporation | Papier coloré avec pénétration de teinte contrôlée |
PT106222A (pt) * | 2012-03-21 | 2013-09-23 | Inst Politecnico De Tomar | Formulação de alumina trihidratada (ath) modificada com estrutura bohemítica como pigmento em revestimento para papel mate |
US9188889B2 (en) | 2007-09-07 | 2015-11-17 | Ccl Label, Inc. | High opacity laser printable facestock |
WO2019058034A1 (fr) | 2017-09-22 | 2019-03-28 | Papeterie Zuber Rieder | Papier opaque resistant a l'immersion |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6063449A (en) * | 1995-10-05 | 2000-05-16 | Valmet Corporation | Method and apparatus for coating a moving paper or cardboard web |
US6387500B1 (en) * | 1997-11-06 | 2002-05-14 | Cabot Corporation | Multi-layered coatings and coated paper and paperboards |
US20040131875A1 (en) * | 2001-03-13 | 2004-07-08 | Markku Hamalainen | Method for coating a web of paper or paperboard and a coated paper grade |
US20050158570A1 (en) * | 2002-01-25 | 2005-07-21 | Arjo Wiggins Papiers Couches | Highly-opaque layered sheet and the production method thereof |
-
2005
- 2005-10-26 FI FI20055576A patent/FI20055576L/fi not_active IP Right Cessation
-
2006
- 2006-10-25 WO PCT/FI2006/050460 patent/WO2007048878A1/fr active Application Filing
- 2006-10-25 EP EP06808001A patent/EP1941100A4/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6063449A (en) * | 1995-10-05 | 2000-05-16 | Valmet Corporation | Method and apparatus for coating a moving paper or cardboard web |
US6387500B1 (en) * | 1997-11-06 | 2002-05-14 | Cabot Corporation | Multi-layered coatings and coated paper and paperboards |
US20040131875A1 (en) * | 2001-03-13 | 2004-07-08 | Markku Hamalainen | Method for coating a web of paper or paperboard and a coated paper grade |
US20050158570A1 (en) * | 2002-01-25 | 2005-07-21 | Arjo Wiggins Papiers Couches | Highly-opaque layered sheet and the production method thereof |
Non-Patent Citations (1)
Title |
---|
See also references of EP1941100A4 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9188889B2 (en) | 2007-09-07 | 2015-11-17 | Ccl Label, Inc. | High opacity laser printable facestock |
US10636330B2 (en) | 2007-09-07 | 2020-04-28 | Ccl Label, Inc. | Block out label, label sheet, and related method |
US10354561B2 (en) * | 2007-09-07 | 2019-07-16 | Ccl Label, Inc. | Block out label, label sheet, and related method |
US20090068389A1 (en) * | 2007-09-07 | 2009-03-12 | Maule Alan W | Block out label, label sheet, and related method |
US9696643B2 (en) | 2007-09-07 | 2017-07-04 | Ccl Label, Inc. | High opacity laser printable facestock |
WO2009040471A3 (fr) * | 2007-09-27 | 2009-07-16 | Metso Paper Inc | Procédé et dispositif pour recouvrir une bande de matériau fibreux d'au moins deux couches de revêtement |
WO2009040471A2 (fr) * | 2007-09-27 | 2009-04-02 | Metso Paper, Inc. | Procédé et dispositif pour recouvrir une bande de matériau fibreux d'au moins deux couches de revêtement |
US10030175B2 (en) | 2007-09-28 | 2018-07-24 | Avery Dennison Corporation | Opacifying label |
WO2009042371A1 (fr) * | 2007-09-28 | 2009-04-02 | Avery Dennison Corporation | Étiquette opacifiante |
WO2009108506A1 (fr) * | 2008-02-19 | 2009-09-03 | Meadwestvaco Corporation | Papier coloré avec pénétration de teinte contrôlée |
PT106222A (pt) * | 2012-03-21 | 2013-09-23 | Inst Politecnico De Tomar | Formulação de alumina trihidratada (ath) modificada com estrutura bohemítica como pigmento em revestimento para papel mate |
WO2019058034A1 (fr) | 2017-09-22 | 2019-03-28 | Papeterie Zuber Rieder | Papier opaque resistant a l'immersion |
FR3071517A1 (fr) * | 2017-09-22 | 2019-03-29 | Papeterie Zuber Rieder | Papier opaque resistant a l'immersion |
AU2018337795B2 (en) * | 2017-09-22 | 2023-01-19 | Papeterie Zuber Rieder | Opaque paper withstanding immersion |
Also Published As
Publication number | Publication date |
---|---|
EP1941100A1 (fr) | 2008-07-09 |
FI20055576A0 (fi) | 2005-10-26 |
FI20055576L (fi) | 2007-04-27 |
EP1941100A4 (fr) | 2011-10-19 |
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