CN111989435B - Coated white paperboard - Google Patents
Coated white paperboard Download PDFInfo
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- CN111989435B CN111989435B CN201980026681.XA CN201980026681A CN111989435B CN 111989435 B CN111989435 B CN 111989435B CN 201980026681 A CN201980026681 A CN 201980026681A CN 111989435 B CN111989435 B CN 111989435B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/72—Coated paper characterised by the paper substrate
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
The invention aims to provide a coated white board which has no pigment coating layer on the back surface, has excellent appearance quality for the back surface and has good appearance of a printed image. Specifically, the present invention provides a coated white board comprising 3 base papers including at least a top sheet, an intermediate sheet and a back sheet, and a pigment coating layer containing a pigment and an adhesive on the surface of the top sheet, wherein the back sheet is a layer made of printed waste paper pulp and colored with a yellow coloring material.
Description
Technical Field
The present invention relates to coated white board. In particular, the present invention relates to coated white board having a non-pigmented coating side with a printing effect and a high-quality feel.
Background
White board is generally thick paper having a multilayer base paper structure of 2 to 9 layers, and waste paper pulp is frequently used because of increased demands for environmental improvement and cost reduction. For example, bleached pulp or deinked pulp or bleached waste paper pulp having a high whiteness is used for the top sheet, and inexpensive deinked pulp or undeinked waste paper pulp having a lower whiteness is used for the middle sheet and the back sheet. The blend ratio of used paper pulp is increasing every year, and about 100% of used paper pulp is blended in white board of low grade. In this case, there are problems that defects such as dust and black spots and white unevenness are increased as base paper problems associated with an increase in the mixing ratio of waste paper. In order to remove foreign matters such as dust, a deinking process and a dust removal process are reinforced, and the problem of dust is greatly improved by the progress of deinking technology and dust removal equipment, but the dust is not completely removed. Since the more the deinking treatment and the dust removal treatment are intensified, the more the yield is deteriorated, which is economically disadvantageous, the deinking treatment and the dust removal treatment are not performed to a certain extent or more at present.
The coated white board is a white board having a pigment coating layer on a base paper made by multi-layer papermaking, and is mainly used for packaging boxes of foods, cosmetics, pharmaceuticals, soaps, gifts and the like, wherein the pigment coating layer is coated with a coating liquid containing a pigment and a binder as main components. In order to advertise the products contained in the bags, printing is performed on the surface of coated white cardboard by various printing methods such as offset printing, gravure printing, and recently inkjet printing, and then various post-processes such as punching and sticking are performed to process the coated white cardboard into a paper machine. The coated white board is classified into high-grade white board, special white board, and coated white board according to the composition of the base paper and the state of formation of the coating layer. The high-grade white board is often a white board having a coating layer on both surfaces thereof, and the special white board is a white board having a coating layer on both surfaces or one surface thereof, and the high-grade white board and the special white board are called as a grey white board (Manila board), in which chemical pulp is used for a top layer and a back layer, waste paper is used for a layer on the inner side of the top layer and the back layer, and the coating layer is provided on both surfaces or one surface of the white board. The coated white board is a white board in which chemical pulp is used for the surface layer, waste paper is used for the back layer and the layer on the inner side of the back layer, and a coating layer is provided on one surface.
Coated white cardboard having a pigment coating layer only on one side is often used for a snack box application or the like, and it is assumed that printing is performed only on the pigment coated side, but in recent years, there are increasing cases where specifications and illustrations are printed on the back side of the coated white cardboard, that is, the non-pigment coated side, and therefore, demands for appearance quality, printing suitability, and printing quality are also increasing for the back side. Therefore, although coated white cardboard having a pigment coating layer also on the back surface has been proposed (for example, patent documents 1 and 2), there is a problem that the cost is increased.
Patent documents:
patent document 1: japanese patent application laid-open No. 2002-266283
Patent document 2: japanese unexamined patent application publication No. 2000-192395
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coated white board which has no pigment coating layer on the back surface, but has excellent appearance quality and printing suitability even on the back surface, and has a good appearance of a printed image.
As a result of intensive studies to solve the above problems, the present inventors have found that a coated white board having a high-grade appearance, a beautiful back surface printing and excellent printing suitability can be obtained by forming the back layer in the base paper of the coated white board as a layer made of printed waste paper pulp and colored with a yellow coloring material, and have completed the present invention.
Specifically, the present invention is summarized as follows.
1. A coated white board comprising 3 base papers each having at least a top sheet, an intermediate sheet and a back sheet, wherein the top sheet has a pigment-coated layer containing a pigment and an adhesive on the surface thereof, and the back sheet is a layer made of a printed waste paper pulp and colored with a yellow coloring material.
2. The coated white sheet according to claim 1, wherein the back layer has a color of b based on a light source containing ultraviolet rays according to JIS P8150 * A value of b * =0 or more and 15 or less.
3. The coated white sheet according to 1 or 2, wherein the yellow coloring material is added in an amount of 0.01 to 0.1 parts by weight based on 100 parts by weight of the entire pulp of the back layer.
According to the present invention, since the back layer is colored with a yellow coloring material, even if the back layer of the base paper is made of printed waste paper pulp, the appearance is high-grade, and thus a coated white board suitable for use as a packaging box such as a snack box can be provided.
Even if the coated white sheet does not have a pigment coating layer on the back surface thereof, the coated white sheet of the present invention has good printing effect, excellent appearance and excellent printing suitability even when the specification and the illustration are printed on the back surface.
Detailed Description
The coated white paper of the present invention will be described in detail below. In the present specification, the term "printed waste paper pulp" refers to printed waste paper such as magazine waste paper pulp, and does not include unprinted waste paper.
(about base paper)
The base paper of the coated white board of the invention is a base paper of 3 pulp layers (paper layers) which are manufactured by at least a plurality of layers and are provided with a surface layer, a middle layer and a back layer, and the base paper of the back layer is formed by printing waste paper pulp.
The printing waste paper pulp used for the back layer on the base paper of the present invention is only required to be a pulp using printed paper as a raw material, and examples of the printing waste paper as a raw material include medium-quality waste paper such as newspaper waste paper, magazine waste paper, miscellaneous paper, advertisement leaflet waste paper, color waste paper, and forest paper, and low-quality waste paper. The printed waste paper pulp may or may not be deinked, but deinked pulp is preferred.
The basis weight of the back layer is preferably 15 to 40g/m 2 . More preferably 18 to 35g/m 2 . The basis weight of the backing layer is less than 15g/m 2 In the case of a color mask, dust existing in the middle layer cannot be masked, and unevenness of color may occur. Further, since the back layer is a layer colored with a yellow coloring material, if the basis weight exceeds 40g/m 2 In this case, the amount of the yellow coloring material to be used is large, and therefore, this is not preferable from the viewpoint of cost.
The surface layer and the intermediate layer in the base paper of the present invention can be made of a base paper material generally used for coating white board without any exception, but it is preferable to add waste paper pulp. The use of a base paper containing more wastepaper pulp or more undeinked pulp is cost-effective and, in addition, the environmental load can be reduced. The deinked pulp may be deinked or not, and examples of the deinked pulp include those produced from sorted waste paper such as high-quality paper, medium-quality paper, low-grade paper, newspaper, advertisement leaflet, magazine, or unsorted waste paper mixed with these papers. The amount of the used paper pulp may be 50 wt% or more, preferably 80 wt% or more, based on the total pulp of the base paper. Further, pulps other than the waste paper pulp are not particularly limited, and chemical pulps such as sulfate pulp and sulfite pulp; mechanical pulp such as thermomechanical pulp (TMP), pressure groundwood pulp, etc.; semi-chemical pulp such as chemical thermomechanical pulp (C-TMP). The pulp used may be a mixture of these various pulps, or the same pulp may be used. In addition, 1 or more paper layers containing different pulps may be stacked.
The base paper of the present invention may be formed by using pulp having low whiteness on the middle layer and pulp having higher whiteness on the top layer, for example, and may be formed by overlapping the pulps of all the layers in the same manner.
The base paper in the present invention may or may not contain a filler. Since the base paper of the present invention containing a large amount of used paper pulp contains a large amount of ash derived from the used paper, the base paper contains ash even without adding a filler again. When the filler is added, the filler to be added is not particularly limited, but for example, 2 or more kinds of clay, calcined clay, diatomaceous earth, talc, kaolin, calcined kaolin, delaminated kaolin (washed kaolin), ground calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, calcium sulfite, gypsum, white carbon, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, paper sludge, regenerated inorganic particles from deinked foam, and other inorganic fillers, urea resin, polystyrene resin, polyvinyl chloride resin, melamine resin, phenol resin, plastic fine hollow particles, and other regenerated fillers derived from fillers contained in waste paper, broke paper, and the like can be used alone or in appropriate combination. In order to cover up the unevenness of dust and color in the intermediate layer, it is preferable to add the filler to the base paper, and the filler is added to the back layer in an amount of 2 wt% or more based on 100 wt% (solid content) of the pulp of the back layer. The amount of the filler to be blended into the surface layer and the middle layer is not particularly limited, but if the blending ratio of the filler is increased, the interlayer strength of the paper is lowered, and therefore, it is necessary to adjust the amount appropriately according to the target quality.
The method for making the base paper in the present invention is not particularly limited, and may be carried out using a fourdrinier machine including a top wire Former (top wire) or the like, a lap Former (on top Former), a Gap Former (Gap Former), a cylinder machine, a board machine using a combination of a fourdrinier machine and a cylinder machine, a yankee dryer (yankee dryer machine), a hybrid machine combining these machines, or the like, and 1 or 2 or more layers may be made as the surface layer or the intermediate layer. The pH value during papermaking can be acidic, neutral or alkaline. In the case of making base paper in multiple layers, the pH values of the layers may be the same or different for each layer. The papermaking speed is not particularly limited. The base paper of the coated white board of the present invention usually has a basis weight of 150 to 650g/m 2 Left and right.
In the case of producing coated white board by the present invention, the base paper may be smoothed in advance by an on-line soft calender, an on-line cooling calender or the like before the coating step.
In the present invention, the method of drying the base paper is not limited. For example, various methods such as a drum heating by steam, a hot air heating dryer, a gas heating dryer, an electric heating dryer, an infrared heating dryer, and the like can be used alone or in combination.
In the present invention, base paper having low smoothness may be used, but base paper having high smoothness may be used within a range in which a coating liquid pool (puddling) called a liquid pool (puddling) when forming a pigment coating layer does not occur. In order to improve the smoothness of the base paper, a pre-calendering treatment or the like may be performed before the formation of the pigment coating layer. As a method for improving the smoothness of the base paper, a clear coating material containing starch as a main component or a coating material containing a pigment may be applied to the base paper before the pigment coating layer is formed. The precoated base paper may be used for the formation of a pigment coating layer after the drying step, or may be used for the formation of a pigment coating layer without the drying step, i.e., in a state where the paint on the base paper is wet, while it is left as it is. In this way, the state of the pre-coated base paper before being used for forming the pigment coating layer is not limited.
(for yellow coloring material)
The back layer of the base paper in the present invention is a layer colored with a yellow coloring material. The back layer may be colored by adding a yellow coloring material to the back layer itself of the base paper, but the yellow coloring material may be added to both the back layer of the base paper and the transparent coating layer. A method of forming a transparent coating layer in which an adhesive and a yellow coloring material are mixed on the surface of the back layer without coloring the back layer itself of the base paper can also be considered to obtain an appearance in which the back layer is colored. However, when a yellow coloring material is added to the transparent coating layer, the coating unevenness of the transparent coating layer becomes conspicuous due to the yellow coloring material, and the appearance is impaired. Therefore, in order to obtain a coated white board having excellent appearance quality and printing suitability even on the back surface and also having good appearance of a printed image, it is a preferable method to color the back layer itself of the base paper with a yellow coloring material.
The yellow coloring material that can be used in the present invention may be a dye or a pigment, and is not limited as long as it has a yellow hue. Specific examples of the dye include direct dyes such as C.I. direct Yellow-1, -2, -4, -8, -11, -12, -26, -27, -28, -33, -34, -41, -44, -48, -86, -87, -88, -135, -142, and-144, acid dyes such as C.I. acid Yellow-1, -3, -4, -7, -11, -12, -13, -14, -19, -23, -25, -34, -38, -41, -42, -44, -53, -55, -61, -71, -76, and-79, and cationic dyes such as C.I. Basic Yellow-1, -11, -13, -19, -25, -33, and-36. Examples of the pigment include, in addition to acetoacetanilide type monoazo pigments, acetoacetanilide type disazo pigments, condensed azo pigments, benzimidazolone type monoazo pigments and isoindolinone type pigments, various pigments such as threne type, metal complex type, quinophthalone type and isoindoline type pigments, specifically, monoazo pigments such as Symuler Fast Yellow (Fast Yellow) -GH, -10GH and 4117, etc., disazo pigments such as-GF concentrated (condensed), -GRF, 5GF and-8 GF, and condensed azo pigments such as Chromophthol Yellow-3G, 6G and GR. Among them, direct dyes are preferred. These may be used alone or in combination of 2 or more.
In the present invention, the yellow coloring material is preferably added to the back layer of the base paper in a proportion of 0.01 to 0.1 parts by weight, more preferably 0.02 to 0.08 parts by weight, and still more preferably 0.02 to 0.05 parts by weight, based on 100 parts by weight (solid content) of the entire pulp of the back layer. If the amount is less than 0.01 parts by weight, the coloring material is insufficient and a sufficient coloring effect cannot be obtained, and if the amount is more than 0.1 parts by weight, the yellow modulation of the back layer becomes too strong, so that the high-grade feeling of the present invention cannot be obtained and the printed matter becomes unsightly, which is not preferable.
As described above, in the field of coated white cardboard, in recent years, in applications such as snack boxes, printing is often performed not only on the side (outer side) of the coated layer on which printing is normally expected to be performed but also on the back layer (inner side) on which the base paper is exposed, such as instructions and guesses for consumers. When printing is performed on a back layer of coated white board containing a large amount of waste paper and generally having a hue close to gray, there is no clean impression and the printing is not beautiful. However, by coloring the base paper itself of the back layer with the yellow coloring material of the present invention, particularly by adding the yellow coloring material in a range of 0.01 parts by weight or more and 0.1 parts by weight or less to 100 parts by weight (solid content) of the whole pulp of the back layer, a coated white board having a high-grade feel and a printing effect can be formed.
(for pigment coating layer)
The coated white paperboard of the present invention is a coated white paperboard having a pigment coating layer containing a pigment and a binder on a surface of a base paper. The pigment coating layer of the present invention may have only 1 layer, but may have 2 or more layers. When the pigment coating layer of the present invention is composed of 2 layers, the outermost coating layer is also referred to as a top coating pigment coating layer, and the coating liquid on which the top coating pigment coating layer is formed is referred to as a top coating pigment coating liquid. Further, a layer adjacent to the outermost layer and closer to the base paper is also referred to as an undercoat pigment coating layer, and a coating liquid forming the undercoat pigment coating layer is also referred to as an undercoat pigment coating liquid. The pigment coating liquids for forming the respective coating layers may be completely different pigment coating liquids, or the same pigment coating liquid may be used in 2 or more layers.
The pigment coating liquid in the present invention can be prepared by mixing necessary components such as a pigment and a binder with water. For the preparation of the pigment coating liquid, a usual mixing means such as a stirrer can be used. Next, the components and the like contained in the pigment coating liquid will be described.
The pigment coating liquid of the present invention may use a conventionally known pigment. Specific examples thereof include inorganic fillers such as clay, calcined clay, diatomaceous earth, talc, kaolin, calcined kaolin, delaminated kaolin, ground calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, calcium sulfite, gypsum, white carbon, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, paper mill sludge, regenerated inorganic particles derived from deinked foam, and organic fillers such as urea-formaldehyde resin, polystyrene resin, polyvinyl chloride resin, melamine resin, phenol resin, and plastic fine hollow particles. Among them, in order to obtain high shielding property and smoothness, it is preferable that a delaminated kaolin is contained in any one of the pigment coating layers. The content ratio of the delaminated kaolin is preferably 5 to 100 parts by weight, and more preferably 10 to 50 parts by weight, based on 100 parts by weight of the pigment. In order to obtain a masking property while maintaining a high whiteness, it is preferable to contain calcium carbonate in any one of the pigment coating layers, and in particular, it is more preferable to contain calcium carbonate in a top coating pigment coating layer which is required to have a masking property and a high whiteness. The calcium carbonate contained in the top coating pigment coating layer may be either heavy calcium carbonate or light calcium carbonate, but light calcium carbonate having excellent covering properties is preferred. The proportion of the calcium carbonate of either or both of the heavy calcium carbonate and the light calcium carbonate is preferably in the range of 20 parts by weight or more and 100 parts by weight or less, and more preferably in the range of 30 parts by weight or more and 90 parts by weight or less, based on 100 parts by weight of the pigment in each layer.
The binder (binder) contained in the pigment coating liquid of the present invention is not particularly limited, and a conventional binder for coated paper can be used. Specific examples thereof include various copolymers such as styrene-butadiene, styrene-acrylic, ethylene-vinyl acetate, butadiene-methyl methacrylate, and vinyl acetate-butyl acrylate, and synthetic adhesives such as polyvinyl alcohol, anhydrous maleic acid copolymer, and acrylic acid-methyl methacrylate copolymer; proteins such as casein, soybean protein, and synthetic protein; etherified starches such as oxidized starch, cationized starch, urea-phosphated starch, hydroxyethyl etherified starch and the like, and starches such as dextrin and the like; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, and nanocellulose, and 1 or more of these binders can be appropriately selected and used. In order to obtain sufficient coating layer strength and water retention property at the time of coating, starch and styrene-butadiene copolymer are preferably used for the coated white sheet of the present invention.
The mixing ratio of the pigment and the binder in the pigment coating liquid for forming each coating layer of the present invention can be appropriately adjusted within a range in which a desired pigment coating liquid can be obtained. The binder is usually contained in an amount of preferably 5 to 30 parts by weight, more preferably 8 to 20 parts by weight, based on 100 parts by weight of the pigment, in terms of a solid content. When the amount is less than 5 parts by weight, the strength of the pigment coating layer is deteriorated, and there are problems such as generation of paper dust and deterioration of printing strength. When the amount is more than 30 parts by weight, voids between white pigment particles in the coating layer are filled with the binder, and the light scattering property of the coating layer is deteriorated, so that problems such as deterioration in opacity, deterioration in ink absorbency during printing, deterioration in printability, and increase in cost occur.
In the pigment coating liquid for forming a pigment coating layer of the present invention, various additives usually blended in pigments for coated paper, such as a dispersant, a viscosity modifier, a water retention agent, a defoaming agent, a water resistance agent, a fluorescent dye, a coloring pigment, a surfactant, a pH adjuster, a cationic resin, an anionic resin, an ultraviolet absorber, and a metal salt, can be suitably used as needed, in addition to the pigment and the binder.
The solid content concentration of the pigment coating liquid is preferably 58 wt% or more, and more preferably 62 wt% or more. When the solid content is less than 58 wt%, the pigment coating liquid may excessively penetrate into the base paper, thereby deteriorating the quality of the coated white board. On the other hand, although the upper limit of the solid content concentration is not particularly limited, if transportability or the like is taken into consideration, it is preferably 75% by weight or less, more preferably 70% by weight or less.
(coating method)
The coating method for forming the pigment coating layer of the present invention is not particularly limited, and 1 or 2 or more layers of coating may be performed using various coating apparatuses generally used, such as a blade coater, a bar coater, an air knife coater, a roll coater, and a curtain coater.
In the present invention, the amount of the pigment coating layer is preferably 5 to 50g/m in total for 1 or even 2 or more layers 2 More preferably 45g/m 2 The following coating amounts were used. The pigment coating layer is preferably 10 to 40g/m on a dry weight basis 2 More preferably 11 to 35g/m 2 . At a coating weight of less than 5g/m 2 In this case, the coating layer becomes thin, and it is sometimes difficult to sufficiently improve the whiteness and white unevenness of the white board. On the other hand, when the coating amount exceeds 50g/m 2 In this case, the workability may be deteriorated due to deterioration of drying property during coating, or the adhesive may migrate to cause uneven printingThe method is as follows.
Although the amount of the undercoat pigment coating layer and the amount of the top pigment coating layer to be applied in forming the undercoat pigment coating layer and the top pigment coating layer are not particularly limited as the pigment coating layer of the present invention, it is preferable that the amount of the undercoat pigment coating layer on one side is 4 to 30g/m per dry weight to achieve compatibility between the masking property and the whiteness 2 The top coating layer is 1-20 g/m 2 And preferably the top coat layer is applied in a greater amount than the base coat layer.
When the pigment coating layer has 3 or more layers, the whiteness and specific scattering coefficient of a layer other than the top pigment coating layer and the bottom pigment coating layer (referred to as "other pigment coating layer" for convenience) can be set in the middle of the top pigment coating layer and the bottom pigment coating layer. For example, the whiteness of the other pigment coating layer can be made higher than the whiteness of the base paper and lower than the whiteness of the top-coated pigment coating layer. The specific scattering coefficient of the other pigment coating layer may be equal to or higher than that of the undercoat pigment coating layer.
The coated white sheet of the present invention is usually produced through a drying step after the pigment coating layer is provided on the base paper, but may be subjected to a smoothing treatment such as a surface treatment step as needed. In a preferred embodiment, the moisture content of the coated white board after production is adjusted to 3 to 10 wt%, more preferably about 4 to 8 wt%. For the smoothing treatment, a smoothing treatment device such as a general supercalender, a gloss calender, a soft calender, a thermo-calender, or a shoe calender can be used. The smoothing apparatus can be used appropriately on-machine or off-machine, and the form of the pressing apparatus, the number of pressing rollers, heating, and the like can be adjusted appropriately. In a preferred embodiment, the smoothness is adjusted so that the PPS roughness under a 2000kPa clamping pressure after production is 1.6 μm or less. The lower limit is 0.1 μm or more. When the PPS roughness is less than 0.1 μm, the densification of the pigment coating layer accompanied by the smoothing treatment becomes remarkable, and the opacity of the pigment coating layer is lowered, so that a high masking effect of unevenness of dust and color of the base paper cannot be obtained. Therefore, it is also preferable to be 0.5 μm or more in order to prevent the opacity of the pigment coating layer from decreasing. On the other hand, if the PPS roughness is higher than 1.6 μm, smoothness is low, and sufficient white paper feeling and printed surface feeling cannot be obtained.
In the present invention, the transparent coating layer may be provided on the surface of the back layer on which the pigment coating layer is not provided, but the pigment coating layer is not provided, for rigidity and curl suppression. Although the coated white board of the present invention is made of printed waste paper pulp, the coated white board has such characteristics that the appearance has a high-grade feeling and the back surface printing is beautiful by coloring the back layer of the base paper with a yellow coloring material. Therefore, when a yellow coloring material is added to the back layer of the base paper, it is preferable to provide a transparent coating layer having high transparency so as not to impair the hue of the base paper colored with the coloring material. In the transparent coating liquid for forming the coating layer on the surface of the back layer, the conventionally known and commonly used binder, various coloring materials, a dispersant, a viscosity modifier, a water retaining agent, a defoaming agent, water resistance, a surfactant, a pH adjuster, a cationic resin, an anionic resin, an ultraviolet absorber, a metal salt and various auxiliaries usually blended in the transparent coating liquid can be appropriately used as needed. In the coated white sheet of the present invention, starch, a styrene-butadiene copolymer, and polyvinyl alcohol are preferably used as a binder, and polyvinyl alcohol is more preferably used from the viewpoint of surface strength, curl suppression, and printing suitability. Polyvinyl alcohol is preferred because it has high transparency and does not inhibit the transmission of the color of the base paper of the back sheet. In addition, polyacrylamide is preferably used as the paper strength agent. In the coated white board of the present invention, a coloring material such as a yellow coloring material may be added to the transparent coating layer on the surface of the back layer.
The coating method for forming the transparent coating layer of the present invention is not particularly limited, and various coating apparatuses such as a blade coater, a bar coater, an air knife coater, a roll coater, a curtain coater, and a spray coater can be used, and the coating can be performed in the calendering step.
The coated white sheet of the present invention has a color ofThe color measured in accordance with JIS P8150 is preferably L on the coating layer side * =91 or more and 93 or less, a * Not less than-0.2 but not more than 0.1, b * Not less than-0.1 and not more than 0.5, and the back layer side is preferably L * A is not less than 77 and not more than 83 * =0.0 or more and 3.0 or less, b * Not less than 0 and not more than 15, and L is more preferably on the coating layer side * =91 or more and 92.5 or less, a * Not less than-0.1 and not more than 0.1, b * Not less than 0.0 and not more than 0.4, and L is more preferably selected on the back layer side * =78 or more and 82 or less, a * Not less than 0.5 but not more than 2.0, b * Not less than 8.5 and not more than 11. The coated white sheet of the present invention can provide a beautiful appearance without unevenness and a high-grade feeling by providing a pigment coating layer made of a white pigment on the top sheet and forming a hue within the above range, and can provide a high-grade feeling to the back surface when a packaging box such as a snack box is produced even when the back sheet itself is colored with a yellow coloring material to form a hue within the above range on the back surface side not having the pigment coating layer. Since the back surface is preferably yellow in the present invention, it is important to be b * The values are in the above ranges.
Examples
The production method of the present invention will be described in detail below, but the present invention is not limited to these examples.
(evaluation method)
(1) Basis weight: measured according to JIS P8124.
(2) And (3) thickness of paper: measured according to Japanese Industrial Standard JIS P8118.
(3) Density: the basis weight and the thickness were determined in accordance with JIS P8118.
(4) Whiteness degree: the measurement was carried out in accordance with Japanese Industrial Standard JIS P8148 "paper, paperboard and pulp-method for measuring ISO whiteness (diffuse reflectance of blue light) of International Standard".
(5)L * a * b * The color system is as follows: the measurement was carried out using a spectrocolorimeter (CMS-35 SPX model, color technical research institute, kyowa, ltd.) in accordance with JIS P8150.
At L * a * b * In the color system, L is used * To express lightness, by a * 、b * To represent the chroma, which represents the hue and chroma. a is * Positive values of (A) indicate the red direction, negative values indicate the green direction, b * Positive values of (d) indicate a yellow direction and negative values indicate a blue direction.
(example 1)
(base paper 1)
The basis weight of 33g/m was made using a pulp sheet of LBKP100%, respectively 2 A surface layer of 36g/m basis weight prepared from 100% deinked waste paper pulp 2 The top and bottom layers 3 to 6 corresponding to the middle layer and the 7 th layer corresponding to the back layer were combined by using 100% pulp of undeinked magazine waste paper pulp, and then pressed and dried to obtain a basis weight of 294g/m 2 Coated white board base paper of (1). To the pulp slurry of each layer, 0.6 wt% of a paper strength enhancer and 1.5 wt% of aluminum sulfate were added with respect to 100 wt% of the pulp (solid content), and to the pulp slurry constituting the back layer (7 th layer), 0.02 wt% of a yellow dye (direct paper yellow manufactured by chemical industries, ltd.) was further added with respect to 100 wt% of the pulp (solid content) of the back layer. In the present invention, on a base paper produced by multi-layer papermaking, the top layer on the side where the pigment coating layer is formed is referred to as a top layer, the 2 nd layer from the pigment coating layer toward the opposite side is referred to as a top layer, the back layer is referred to as a back layer, and the other layers are referred to as middle layers.
(Top coating pigment coating liquid 1)
A pigment slurry comprising 25 parts by weight of delaminated kaolin (manufactured by IMERYS Co., ltd., contact 1500), 24 parts by weight of fine kaolin (kaofine), 26 parts by weight of ground calcium carbonate (manufactured by IMERYS Co., ltd., carbital 97), 19 parts by weight of spindle-shaped light calcium carbonate (manufactured by Otto mol Co., ltd., TP-221F) and 6 parts by weight of titanium dioxide was prepared, and then 14.5 parts by weight of styrene-butadiene copolymer latex and 2 parts by weight of urea-phosphated starch were added to 100 parts by weight of the pigment, and water was further added to obtain a top coating pigment coating liquid having a solid content of 60%.
(undercoat pigment coating liquid 1)
After a pigment slurry was prepared comprising 20 parts by weight of delaminated kaolin (manufactured by IMERYS, contact 1500) and 80 parts by weight of ground calcium carbonate (manufactured by IMERYS, carbon 90), 12 parts by weight of styrene-butadiene copolymer latex and 3 parts by weight of urea phosphated starch were added to 100 parts by weight of the pigment, and water was added thereto to obtain an undercoat pigment coating liquid having a solid content of 60%.
(coating, finishing treatment)
On the surface of the base paper 1, a single-side coating amount was 8g/m by a bar coater 2 The undercoat pigment coating solution 1 was applied in the manner described above, and then, without a drying step, the amount of coating on one side was 12g/m 2 The top-coat pigment coating layer 1 was applied and dried. Thereafter, smoothing was carried out with a calender and only at 1.0g/m on the back side 2 Coated with a coating composed of polyvinyl alcohol (JAPAN VAM)&A transparent coating solution composed of 2.2 wt% of PX171P manufactured by ltd) and 0.8 wt% of polyacrylamide (G50 manufactured by Harima Chemicals Group, inc.) so as to have a target basis weight of 314G/m 2 The coated white board was manufactured in the manner of (1).
Comparative example 1
A coated white board was produced in the same manner as in example 1, except that the yellow coloring material was not added to the back layer of the base paper 1.
Table 1 shows the evaluation results of the coated white boards of example 1 and comparative example 1.
(Table 1)
The results according to Table 1 show that the L of the white board paper is due to the coating of the invention * a * b * B in the color system * Since a high value gives a hue with a strong yellow tone, the printing effect is good even when instructions and diagrams are printed on the back surface, and the appearance is excellent even without a pigment coating layer.
The coated white paper of the present invention was confirmed to have a high-grade appearance and to be suitable for use as a packaging box such as a snack box.
Claims (1)
1. A coated white paperboard comprising a 3-ply base paper having at least a top ply, an intermediate ply and a back ply, and a pigment coating layer containing a pigment and an adhesive on the surface of the top ply,
the back layer is a layer which is composed of printing waste paper pulp and is colored by yellow coloring material,
the back layer has a color of b based on a light source containing ultraviolet rays in accordance with JIS P8150 * A value of b * Not less than 0 but not more than 15,
the yellow coloring material is added in an amount of 0.01 to 0.1 parts by weight based on 100 parts by weight of the entire pulp of the back layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-088357 | 2018-05-01 | ||
| JP2018088357A JP7131953B2 (en) | 2018-05-01 | 2018-05-01 | coated white paperboard |
| PCT/JP2019/016433 WO2019211978A1 (en) | 2018-05-01 | 2019-04-17 | Coated white paperboard |
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| CN111989435A CN111989435A (en) | 2020-11-24 |
| CN111989435B true CN111989435B (en) | 2022-11-15 |
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| CN201980026681.XA Active CN111989435B (en) | 2018-05-01 | 2019-04-17 | Coated white paperboard |
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| JP (1) | JP7131953B2 (en) |
| CN (1) | CN111989435B (en) |
| WO (1) | WO2019211978A1 (en) |
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| JP2020007665A (en) * | 2018-07-06 | 2020-01-16 | 大王製紙株式会社 | Colored paper and manufacturing method of colored paper |
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| CN111989435A (en) | 2020-11-24 |
| JP7131953B2 (en) | 2022-09-06 |
| JP2019194377A (en) | 2019-11-07 |
| WO2019211978A1 (en) | 2019-11-07 |
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