WO2012133092A1 - Carton blanc couché et son procédé de fabrication - Google Patents

Carton blanc couché et son procédé de fabrication Download PDF

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Publication number
WO2012133092A1
WO2012133092A1 PCT/JP2012/057296 JP2012057296W WO2012133092A1 WO 2012133092 A1 WO2012133092 A1 WO 2012133092A1 JP 2012057296 W JP2012057296 W JP 2012057296W WO 2012133092 A1 WO2012133092 A1 WO 2012133092A1
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WIPO (PCT)
Prior art keywords
coating
layer
base paper
whiteness
curtain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/057296
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English (en)
Japanese (ja)
Inventor
一彦 石塚
治 小塚
遼 外岡
加藤　進
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Original Assignee
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Nippon Paper Industries Co Ltd
Priority to CN2012800155158A priority Critical patent/CN103476992A/zh
Publication of WO2012133092A1 publication Critical patent/WO2012133092A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to a coated white board having a pigment coating layer on a base paper mixed with used paper, and more particularly to a coated white board having high whiteness, little white unevenness, high whiteness and printing gloss, and a method for producing the same.
  • the base paper of coated white paperboard is usually manufactured by multi-layer papermaking, and the surface layer uses a lot of expensive bleached chemical pulp with high whiteness, and the lower and middle layers are cheaper and cheaper than the exposed chemical pulp. Often used are deinked and undeinked waste paper pulp.
  • the reason why the bleached chemical pulp is used for the surface layer is to keep the white unevenness on the surface of the coated white paperboard well and make it difficult to see foreign matters such as dust contained in the used paper pulp from the surface.
  • the use of waste paper pulp for the lower and middle layers is from the viewpoint of environmental and cost reduction.
  • Patent Documents 1 and 2 disclose a method for producing white paperboard by using a pigment having a high concealment property in the coating liquid.
  • pigments with high hiding properties are expensive, and the advantage of reducing the cost by increasing the usage rate of waste paper pulp is lost.
  • Patent Document 3 discloses a method of improving whiteness unevenness by making the difference in whiteness between the surface layer and the surface layer below a certain level.
  • the usage rate of waste paper pulp cannot be increased beyond a certain level due to the definition of whiteness difference.
  • a method using a roll transfer coating method or an air knife coating method is known instead of the normally used blade coating method.
  • the surface after coating is flattened regardless of the unevenness of the base paper, and the smoothness of the coating surface is high, but the coating amount is non-uniform.
  • the roll transfer coating method and the air knife coating method are more uniform than the blade coating method, and the white unevenness is not noticeable.
  • the roll coating method tends to generate a coating pattern peculiar to a roll called orange peel or the like.
  • the viscosity of the coating solution must be lowered in principle, so if the solid content concentration is lowered, the moisture of the coating solution will soak into the base paper and the base paper will swell. Occurs and surface smoothness deteriorates. The energy required for drying also increases.
  • Patent Document 4 discloses a method of making white unevenness and dust inconspicuous by performing curtain coating without causing coating defects as in the roll coating method.
  • curtain coating is a pre-metering type coating method that does not scrape off the coating liquid during coating, so a uniform coating layer can be applied even if there is some unevenness on the base paper. Therefore, it is considered that white unevenness hardly occurs.
  • Curtain coating does not scrape off with a blade, and the coating layer formed as a curtain film is placed on the base paper, so there are many voids in the coating layer, which is preferable in terms of light scattering and whiteness. It is said.
  • the use of a pigment that can provide a dense coating layer can reduce the voids of the coating layer and slow the ink setting, but the excellent point of curtain coating The bulkiness of the coating layer is lost, and eventually the scattering properties are reduced.
  • the object of the present invention is to maintain a high light scattering property by a coating layer having a large volume and a lot of voids characteristic of curtain coating, while having an appropriate ink setting property and printing gloss. It is to provide a technique for producing a coated white board having a good degree by curtain coating.
  • the present inventors have applied a plurality of coating layers simultaneously with a single curtain film, and an overcoat layer that is the outermost layer provided by this curtain coating By making the coating amount of the undercoat layer within a certain range, even when using a base paper with a low whiteness of 40 to 70%, white board with excellent whiteness and white unevenness and high printing gloss Has been found to be able to be produced efficiently, and the present invention has been completed.
  • the present invention includes the following inventions.
  • a method for producing coated white paperboard comprising forming one curtain film from two or more types of coating liquids, and forming two or more coating layers on the base paper through the base paper through the curtain film.
  • the above method wherein the whiteness of the base paper is 40 to 70%, and the coating amount of the undercoat layer is 10 to 25 g / m 2 per side.
  • the ratio between the coating amount of the overcoat layer and the coating amount of the undercoat layer is 1: 3 to 1: 8.
  • the average particle size (D50) is 0.3 to 0.8 ⁇ m
  • the particle size (D75) at 75 cumulative mass% and the particle at 25 cumulative mass percent of the particle size distribution curve by the sedimentation method is used.
  • a blue / purple color material is contained in at least one of the base paper layer, the overcoat layer, and the undercoat layer, and the hue of the paper in the measurement including ultraviolet rays according to JIS P 8150, and the b * value is ⁇ 10 or more and ⁇ 0
  • Coated white paperboard can be produced by curtain coating.
  • the present invention relates to a coated white paperboard and a method for producing the same.
  • the coated white paperboard is one in which a pigment coating layer is provided on one side or both sides of a base paper, and at least used paper pulp is blended.
  • a white paperboard is produced using a base paper having a low whiteness.
  • the whiteness of the base paper used in the present invention is 40 to 70%, preferably 50 to 70%, more preferably 53 to 68%. According to the present invention, it is possible to produce a white paperboard excellent in whiteness and white unevenness even when such a relatively low whiteness base paper is used.
  • the whiteness refers to the whiteness of the base paper surface on the side where the coating layer is provided. The lower the whiteness of the base paper, the higher the whiteness increase rate of the white paperboard after curtain coating compared to the same amount of coating. For this reason, it is advantageous in terms of cost to use a low whiteness base paper containing a large amount of waste paper pulp or containing pulp that has not been deinked, and the environmental load is also low.
  • the base paper used in the present invention is not particularly limited as long as waste paper pulp is blended, and bleached chemical pulp, unbleached chemical pulp, and the like can be used, for example.
  • Used paper pulp may or may not be deinked, and deinked pulp includes high-quality paper, medium-quality paper, low-grade paper, newspaper, flyers, magazines, etc. It is possible to use deinked pulp and the like.
  • those generally used for base paper of coated white paperboard can be used without exception, and the above-mentioned various pulps may be mixed, or the same pulp may be used. Further, one or more layers of different pulps may be stacked. For example, a pulp having a low whiteness can be used for the middle layer, and a pulp having a higher whiteness can be used for the front layer and the back layer, or a plurality of layers of the same pulp can be stacked. According to the present invention, even if the same low-whiteness pulp as used for the middle layer and the back layer is used for the outermost layer, there is no whiteness unevenness, and a coated whiteboard with high whiteness can be obtained.
  • the whiteness difference between the outermost surface layer of the base paper and the pulp immediately below it may be within 10% (points), but the whiteness difference may be more than 10%.
  • the point mentioned here indicates a difference in whiteness. For example, when the ISO whiteness of the surface layer is 80% and the ISO whiteness of the immediately lower layer is 68%, it is 12 points lower.
  • a base paper having a low smoothness may be used.
  • a base paper having high smoothness can be used.
  • a pre-calender or the like may be performed before curtain coating.
  • a clear paint or a paint containing a pigment containing starch as a main component can be applied to the base paper before curtain coating.
  • This pre-coated base paper may be subjected to curtain coating without undergoing a drying step, that is, with the paint on the base paper wet.
  • the state of the base paper after pre-coating before being used for curtain coating is not limited.
  • one curtain film is formed from two or more kinds of coating liquids, and two or more coating layers are formed on the base paper through the curtain film.
  • a work layer is formed by curtain coating.
  • the outermost coating layer is the topcoat layer
  • the coating liquid for forming the topcoat coating layer is the topcoat coating solution.
  • a layer adjacent to the outermost layer and closer to the base paper is referred to as an undercoat coating layer
  • a coating solution for forming the undercoat coating layer is referred to as an undercoat coating solution.
  • the coating liquid is prepared by mixing water and necessary components.
  • ordinary mixing means such as a mixer may be used.
  • Each component will be described below.
  • one curtain film is formed from two or more kinds of coating liquids.
  • the undercoat coating liquid comprises a pigment and an adhesive (binder).
  • Adhesives are not particularly limited. For example, various copolymers such as styrene / butadiene, styrene / acryl, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, polyvinyl alcohol, and maleic anhydride.
  • Synthetic adhesives such as acid copolymers and acrylic acid / methyl methacrylate copolymers; proteins such as casein, soy protein, synthetic proteins; oxidized starch, positive starch, urea phosphate esterified starch, hydroxyethyl etherified Examples include etherified starch such as starch, starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose.
  • a synthetic adhesive having a low viscosity increase of the paint is suitable.
  • polyvinyl alcohol having a low degree of polymerization degree of polymerization of 1000 or less, for example, a degree of polymerization of about 500
  • the adhesive effect can be enhanced without significantly increasing the viscosity.
  • the pigment used in the curtain coating solution can be contained in the undercoat coating solution.
  • the present invention from the viewpoint of whiteness and white unevenness of the white paperboard, it is possible to form a primer layer having many voids by using a pigment having a small average particle diameter and a sharp particle size distribution as a pigment for the primer layer.
  • the average particle diameter (D50) is 0.2 to 0.8 ⁇ m, preferably 0.2 to 0.4 ⁇ m.
  • a light carbonic acid having a ratio (D75 / D25) of a particle size (D75) at 75 cumulative mass% to a particle size (D25) at 25 cumulative mass% of a particle size distribution curve by a sedimentation method is 1.5 or more and less than 3.5
  • Calcium is preferably used, and the amount used is not particularly limited, but is preferably 10% by weight or more, more preferably 20% by weight or more, and the effect becomes remarkable when 20% by weight to 50% by weight is used. 40% by weight or more, 50% by weight or more, and even 60% by weight or more can be used. However, if the amount exceeds 50% by weight, the surface strength of the coated paper for printing tends to be weak (however, the adhesive By increasing the amount, the surface strength can be improved).
  • a pigment having an average aspect ratio of 30 to 60 for example, delaminated kaolin, can be used in combination for the undercoat coating layer.
  • a pigment having an average aspect ratio of 30 to 60 further improves white unevenness and water retention. This is presumed to be because dehydration is suppressed and water retention is improved by filling a gap between calcium carbonate having a sharp particle size distribution (D75 / D25) of 1.5 or more and less than 3.5 with a flat pigment. Is done.
  • the amount of the pigment having an average aspect ratio of 30 to 60 is not particularly limited, but can be 10% by weight or more, and 40% by weight or less.
  • the solid concentration of the undercoat coating solution is preferably 40 to 75% by weight, more preferably 50 to 70% by weight, and further preferably 60 to 70% by weight.
  • the solid content concentration of the undercoat coating liquid is less than 40% by weight, the volume change of the coating layer during coating drying becomes large, resulting in poor surface smoothness after coating.
  • it is more than 75% by weight the fluidity of the coating liquid is deteriorated, and it becomes difficult to form a uniform curtain film.
  • the B-type viscosity of the undercoat coating solution is preferably in the range of 100 to 2000 mPa ⁇ s so as to be suitable for forming a uniform and stable curtain film and for delivering the coating solution.
  • it is 100 mPa ⁇ s or less, the moisture in the paint soaks into the base paper excessively and the base paper swells, so that the surface smoothness after coating decreases. The energy required for drying also increases.
  • it is greater than 2000 mPa ⁇ s, the fluidity of the paint is inferior and it becomes difficult to form a stable curtain film.
  • the surface tension of the undercoat coating solution is preferably 40 mN / m or less, more preferably 35 mN / m or less, and 30 mN / m or less in order to produce a uniform and stable curtain film even at a small flow rate. Further preferred.
  • the topcoat coating liquid used in the present invention comprises a pigment and an adhesive as in the case of the undercoat coating liquid.
  • a pigment is not restrict
  • inorganic pigments such as kaolin, clay, heavy calcium carbonate, light calcium carbonate, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, satin white, and organic pigments such as plastic pigments
  • Organic / inorganic composite pigments can be used.
  • heavy calcium carbonate, acicular light calcium carbonate, satin white, fine kaolin, fine delamikaolin and titanium dioxide having high whiteness are preferable.
  • These pigments can be used alone, but if necessary, two or more kinds may be mixed and used. As a combination, a combination of heavy calcium carbonate and another pigment having high whiteness is preferable.
  • the average particle diameter (D50) is 0.5 to 1.0 ⁇ m, and the ratio of the particle diameter (D75) at 75 cumulative mass% to the particle diameter (D25) at 25 cumulative mass% (D75 /
  • D50 calcium carbonate with D25
  • the average particle diameter (D50) is 0.5 to 1.0 ⁇ m, and the ratio of the particle diameter (D75) at 75 cumulative mass% to the particle diameter (D25) at 25 cumulative mass% (D75 /
  • the amount of calcium carbonate having D25) of 3.5 or more and 5.0 or less is not particularly limited.
  • the surfactant can be used to adjust the dynamic surface tension of the coating liquid.
  • the surfactant includes an anionic surfactant, a cationic surfactant, and a nonionic surfactant.
  • an anionic surfactant is preferable.
  • the cationic surfactant tends to aggregate the pigment in the coating solution. Further, the nonionic surfactant is difficult to give sufficient wettability to the coating solution.
  • the anionic surfactant include sulfonic acid surfactants, sulfate ester surfactants, and carboxylic acid surfactants.
  • sulfonic acid-based surfactants are preferable and alkylsulfosuccinic acid is particularly preferable because the wettability of the coating liquid can be improved.
  • these surfactants are used in the range of about 0.1 to 2 parts by weight, more preferably about 0.2 to 1 part by weight per 100 parts by weight of the pigment.
  • an adhesive (binder) to the topcoat coating solution.
  • the adhesive is not particularly limited, and an adhesive conventionally used for coated paper can be used.
  • adhesives include styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and other copolymers, polyvinyl alcohol, maleic anhydride copolymer And synthetic adhesives such as acrylic acid / methyl methacrylate copolymers; proteins such as casein, soy protein, synthetic protein; oxidized starch, positive starch, urea phosphated starch, hydroxyethyl etherified starch, etc.
  • adhesives for coated paper such as starches such as etherified starch and dextrin; cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, and hydroxymethylcellulose are included.
  • starches such as etherified starch and dextrin
  • cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, and hydroxymethylcellulose are included.
  • One or more types of adhesives can be appropriately selected and used. In a preferred embodiment, these adhesives are used in the range of about 5 to 50 parts by weight, more preferably about 8 to 30 parts by weight per 100 parts by weight of the pigment. Synthetic adhesives are preferred because they do not raise the paint significantly.
  • topcoat and undercoat coating liquids of the present invention are blended with ordinary pigments for coated paper, such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, and colorants.
  • ordinary pigments for coated paper such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, and colorants.
  • auxiliaries can be used as appropriate.
  • the solid content concentration of the top coating liquid is preferably 40 to 75% by weight, more preferably 50 to 70% by weight, and further preferably 60 to 70% by weight.
  • the solid content concentration of the topcoat coating liquid is less than 40% by weight, the volume change of the coating layer during coating drying increases, resulting in poor surface smoothness after coating.
  • it is more than 75% by weight the fluidity of the coating liquid is deteriorated, and it becomes difficult to form a uniform curtain film.
  • the B-type viscosity of the topcoat coating solution is preferably in the range of 100 to 2500 mPa ⁇ s so as to be suitable for forming a uniform and stable curtain film and for delivering the coating solution.
  • it is 100 mPa ⁇ s or less, the moisture in the paint soaks into the base paper excessively and the base paper swells, so that the surface smoothness after coating decreases. The energy required for drying also increases.
  • it is greater than 2500 mPa ⁇ s, the fluidity of the paint is poor and a stable curtain film cannot be formed.
  • the surface tension of the coating liquid is preferably 40 mN / m or less, more preferably 35 mN / m or less, and even more preferably 30 mN / m or less in order to produce a uniform and stable curtain film even at a small flow rate.
  • curtain coating is a coating method in which a coating liquid is flowed down in a curtain shape to form a film, and a base paper is passed through the film to provide a coating layer on the base paper.
  • Curtain coating is a contour coating in which a coating layer is formed along a base paper, and has a characteristic that the coating amount can be easily controlled because of a so-called pre-weighing system.
  • the coated white paperboard of the present invention is produced by applying two or more layers by curtain coating on both sides or one side of the base paper.
  • one curtain film is formed from a plurality of coating liquids
  • a base paper is passed through the curtain film
  • two or more coating layers are curtain-coated on the base paper.
  • curtain coating is performed by forming multiple curtain films from multiple coating liquids
  • the curtain film becomes thin and unstable as a film, so the film state cannot be maintained until the curtain film falls on the base paper.
  • it may not be possible to apply properly if one curtain film is formed from multiple coating liquids and multiple coating layers are applied simultaneously, the curtain film becomes thicker and stable as a film. Can be applied stably.
  • the coating amount of the topcoat layer which is the outermost layer
  • the coating amount of the undercoat layer is 10 to 25 g / m 2 .
  • the concealability of the undercoat layer is increased, and the whiteness and white unevenness of the white paperboard are reduced even when the base paper is low in whiteness.
  • only the surface layer portion of the white paperboard which has a great influence on the ink setting property and the printing quality can be made into a structure suitable for printing.
  • the ratio of the coating amount of the overcoat layer and the undercoat layer is preferably 1: 1.1 to 1:10, more preferably 1: 2 to 1: 9, and still more preferably 1: 3 to 1: 8. 1: 5 to 1: 8 is even more preferable.
  • curtain coating may be performed after blade coating.
  • the coating amount of the curtain coating layer in the present invention is preferably 10 ⁇ 30g / m 2 by dry weight per side, more preferably 15 ⁇ 30g / m 2, 20 ⁇ 25g / m 2 and more preferable.
  • the coating amount is less than 10 g / m 2 , the coating layer becomes thin and the whiteness and whiteness unevenness of the white paperboard cannot be sufficiently improved.
  • the coating amount of one layer exceeds 30 g / m 2 , it is not preferable because the operability is deteriorated, for example, the drying property at the time of coating is deteriorated, or printing unevenness due to binder migration is caused.
  • the coating amount is preferably 15 to 25 g / m 2 per side, and more preferably 20 to 25 g / m 2 .
  • the whiteness of the product can be made a sufficient value by increasing the coating amount.
  • a known apparatus used for curtain coating can be used.
  • What is known as the shape of the curtain coating apparatus is a slot type curtain coating apparatus that directly forms a curtain film by discharging the coating liquid downward from the die, and discharging the coating liquid upward from the die,
  • a slide-type curtain coating apparatus that flows while forming a coating liquid film on a slope on a die, and then forms a curtain film by free-falling after leaving the die. Any device may be used in the present invention.
  • the coating speed of the present invention is not particularly limited, but is generally about 100 m / min to 800 m / min. When the coating speed is high, craters tend to occur.
  • the coated white paperboard of the present invention is produced through a normal drying process after providing a coating layer on the base paper, but may be smoothed by a surface treatment process or the like as necessary.
  • the coated white paperboard after production is finished by adjusting so that the water content is about 3 to 10% by weight, more preferably about 4 to 8% by weight.
  • a smoothing processing device such as a normal super calendar, gloss calendar, soft calendar, thermal calendar, shoe calendar, or the like can be used.
  • the smoothing apparatus is appropriately used on-machine or off-machine, and the form of the pressure device, the number of pressure nips, heating, and the like are also adjusted as appropriate.
  • Blue / Purple Material In the present invention, one or more color materials selected from the group consisting of purple pigments, purple dyes, blue pigments, and blue dyes (referred to herein as blue-violet materials)
  • the color tone of the coated white paperboard is the hue of the paper in the measurement including ultraviolet rays according to JIS P 8150, and the b * value is ⁇ 10 or more and less than ⁇ 0.5. Is preferred.
  • the blue-violet material is contained in at least one of the base paper layer, the overcoat layer, and the undercoat layer, but may be contained in all layers.
  • opacity and whiteness are affected by reflection of light within the paper surface or within the paper layer and absorption within the paper layer.
  • the opacity defined in JIS P 8149 is a value representing the single sheet luminous reflectance R0 as a ratio to the intrinsic luminous reflectance R ⁇ in the same sample, and is the Z-axis direction (thickness direction) of the coated white paperboard ) Is hardly affected even if the color material is present anywhere.
  • the whiteness specified in JIS P 8148 is the reflectivity (inherent reflectivity) of a sample in which a sufficient number of samples are stacked so that the reflectivity to be measured does not change, and is affected by the pigment contained in the outermost layer. Receive.
  • the effect of the present invention can be efficiently obtained by increasing the ratio of the color material present in the coating layer that is the outermost layer.
  • the blue-violet material is present in a plurality of layers in order to stabilize the color tone.
  • the base paper used in the present invention may be a single-layer paper or a multi-layer paper, but when the base paper contains a blue-violet material, the base paper includes any one or more of a plurality of layers constituting the base paper. What is necessary is just to contain a coloring material.
  • the base paper may be made from the papermaking raw material containing the coloring material.
  • the method for producing the base paper of the present invention is not particularly limited, and can be performed by a known method using known raw materials.
  • the base paper contains a blue / purple dye.
  • the base paper is easily dyed.
  • a dye may cause discoloration with time, such discoloration can be suppressed by including the dye in the innermost base paper layer.
  • the apparent whiteness does not decrease so much.
  • the hue of the base paper is measured with the dye according to the method of JIS P 8150 including ultraviolet rays, and the b * value is ⁇ 10 or more and less than ⁇ 0.5, more preferably ⁇ 3.0 or more and ⁇ 0.5. When adjusted to less than, the effects of the present invention are more easily achieved.
  • the a * value of the base paper layer is not particularly limited because it does not greatly contribute to the whiteness and opacity of the white paperboard. However, it is usually preferably from ⁇ 1 to less than 7, more preferably from ⁇ 1 to less than 5. More preferably less than 3. If it is out of the range, the color of the white paperboard may not appear white, which is not preferable.
  • the amount of the colorant added to the base paper is not particularly limited.
  • the basic dye is 0.001 to 0.01% by weight and the direct dye is 0.015 to 0.00% based on the absolute dry weight of the whole pulp. It may be 15% by weight.
  • the proportion of deinked pulp contained in the base paper is high, it contains a lot of mechanical pulp derived from deinked pulp, and therefore tends to have a yellowish color. Therefore, by adjusting the coated white paperboard to a specific color tone using the blue-purple material according to the present invention, excessive bluishness can be suppressed, and the yellowish color resulting from containing a lot of mechanical pulp is efficiently used. Can be suppressed and high whiteness can be achieved.
  • a blue-violet material When a blue-violet material is contained in the coating layer by curtain coating, it can be carried out by blending a blue-violet material in the coating solution.
  • curtain coating can form a bulky coating layer as compared with blade coating and the like, the coating layer containing a blue-violet material is formed by curtain coating.
  • the whiteness of the white paperboard and the opacity of the coating layer can be improved to further improve the whiteness unevenness.
  • a blue-violet material may be included in any one layer, or a blue-violet material may be included in all coating layers.
  • the color material is preferably contained in the outermost coating layer.
  • the color material means a colored pigment or dye other than white.
  • the pigment is a white or colored powder which is insoluble, hardly soluble or dispersed in water, oil, an organic solvent or the like, and includes an inorganic pigment and an organic pigment.
  • an inorganic pigment or an organic pigment may be used as the color material.
  • the dye refers to an organic dye that is dyed onto fibers, pigments, or the like by an appropriate dyeing method among organic dyes having a specific color by selectively absorbing or reflecting visible light.
  • the dye is soluble in a solvent (such as water or an organic solvent).
  • a dye may be used in combination.
  • “use a blue / purple color material” includes a case where both a blue color material and a purple color material are used, and one of them is used.
  • “blue / purple color material” means “blue and / or purple color material”.
  • blue pigments examples include EMT-Blue DS-18 (manufactured by Toyo Ink Manufacturing Co., Ltd.), and examples of commercially available purple pigments include SA Violet C12896 (manufactured by Mikuni Dye Co., Ltd.). Is mentioned. A blue pigment alone or a purple pigment alone may be used, but both may be used in combination. In order to improve the opacity, it is preferable to use a purple pigment. Moreover, in this invention, you may add color materials other than blue and purple, such as black, red, and yellow, as needed.
  • blue pigment and purple pigment any of inorganic pigments and organic pigments can be used as described above.
  • specific examples of blue pigments include, for example, ultramarine, azurite, prussian blue (bitumen), ultramarine, smalto, cobalt blue (cobalt aluminate), cerulean blue (cobalt stannate), cobalt chrome blue, cobalt, aluminum, and silicon. Examples thereof include oxide, cobalt / zinc / silicon oxide, manganese blue, and phthalocyanine.
  • purple pigments include, for example, cobalt violet (cobalt arsenate, cobalt phosphate, cobalt lithium phosphate, hydrated ammonium cobalt phosphate, cobalt borate, etc.), purple ultramarine blue, iron oxide purple, manganese violet, mineral Examples thereof include inorganic pigments such as violet, indigoid, quinacridone, oxazine, anthraquinone, carbonium, and xanthene organic pigments.
  • cobalt violet cobalt arsenate, cobalt phosphate, cobalt lithium phosphate, hydrated ammonium cobalt phosphate, cobalt borate, etc.
  • purple ultramarine blue iron oxide purple
  • manganese violet mineral
  • inorganic pigments such as violet, indigoid, quinacridone, oxazine, anthraquinone, carbonium, and xanthene organic pigments.
  • the surface color of the coated white paperboard is made pale, the whiteness of appearance is enhanced, and the white Unevenness can be prevented.
  • FIG. 1 shows the change in hue of paper that does not contain the color material of the present invention and paper that has been incorporated, based on the L * a * b * color system.
  • the hue is expressed as 0 ° in the (+) direction of the a * value, 180 ° in the ( ⁇ ) direction, b * value in the 90 ° direction in the (+) direction, and 270 ° in the ( ⁇ ) direction.
  • the hue of the paper after the addition changes to the portion of 210 ° or more and less than 280 ° shown in FIG.
  • the total color material used in the present invention is preferably 0.4 to 3.5 mg, more preferably 0.9 to 3.0 mg per 1 m 2 of coated white paperboard.
  • the amount is less than 0.4 mg, light absorption by the coloring material is small, and thus the concealability contributing to opacity is insufficient, which is not preferable.
  • the amount is more than 3.5 mg, the amount of light absorbed by the coloring material is large, which greatly contributes to improvement in opacity, but the hue deviates greatly from 0 point, and it is not preferable to feel white. Absent.
  • the total content of the color material can be appropriately adjusted depending on the whiteness of the raw material or the base paper.
  • the color material may be contained in either the base paper layer or the coating layer of the coated white paperboard.
  • the total color material amount is a value obtained by adding the color material contents of the respective layers.
  • Coated white paperboard The ash content of the coated white paperboard produced in the present invention is preferably 10% by weight or more, and more preferably 20% by weight or more. This is because when the ash content is less than 10% by weight, the opacity may not be sufficiently improved.
  • Hue of the coating white paperboard produced in the present invention is preferably the b * value is adjusted to less than -15 -0.5 in the measurement containing the ultraviolet defined in JIS P 8150, b * value It is more preferably ⁇ 6 or more and less than ⁇ 1, and a b * value is more preferably ⁇ 4 or more and less than ⁇ 2.
  • the a * value in the measurement is not particularly limited because it does not greatly contribute to the whiteness and opacity of the coated white paperboard, but is usually preferably ⁇ 1 or more and less than 7, more preferably ⁇ 1 or more and less than 5.
  • it is more preferably ⁇ 1 or more and less than 3. If it is out of the above range, the color of the coated white paperboard may not appear white, which is not preferable.
  • Whiteness Whiteness: Measured according to JIS P8148 “Paper, paperboard and pulp—Method of measuring ISO whiteness (diffuse blue light reflectance)”. -White unevenness: Evaluated visually by 4 steps according to the following criteria. A: Unevenness is not noticeable. ⁇ : Mild unevenness is observed. ⁇ Unevenness is recognized, which may cause a problem in practical use. X: Remarkable unevenness was recognized and not suitable for practical use. Blank paper glossiness: Measured according to JIS P8142 “Paper and paperboard—Measurement method of 75 ° specular gloss”.
  • Example 1 (Base paper) 75% whiteness using pulp blended at a rate of 100% deinked waste paper, surface layer of 40g / m 2 of rice tsubo, 55% whiteness using pulp blended with 100% magazine waste paper not deinked, rice Using the same pulp as the middle layer and middle layer of 210g / m 2 , each of the back layers of 45% whiteness and 40g / m 2 is prepared, pressed and dried, and 290g / m 2. A coated white paperboard m 2 was obtained. The whiteness of the base paper was 67%. The paper making speed was 300 m / min.
  • the above coating solution was simultaneously coated with two layers using a slot type curtain coating apparatus and dried. Amount of coating is undercoat coating solution at a weight after drying of 20 g / m 2, topcoat coating solution is 4g / m 2, the basis weight of the coated white paperboard was 314 g / m 2.
  • the coating speed was 300 m / min, the same as the papermaking speed, since it was performed consistently with the papermaking by on-machine.
  • the coated white paperboard obtained was calendered to obtain a coated white paperboard.
  • the processing speed was 300 m / min, which was the same as the papermaking speed and the coating speed, because it was performed consistently with the papermaking and coating by on-machine.
  • Example 2 In Example 1, a coated white paperboard was obtained in the same manner as in Example 1 except that the surface layer of the base paper was changed to 100% magazine waste paper that was not deinked. The whiteness of the base paper was 55%.
  • Example 3 In Example 1, a coated white paperboard was obtained in the same manner as in Example 1, except that the coating amount of the undercoat coating solution was changed to 16 g / m 2 and the coating amount of the topcoat coating solution was changed to 8 g / m 2. It was.
  • Example 6 Obtained in Example 1, the undercoat coating solution coating amount of 12 g / m 2, except that the coating amount of overcoat coating solution was changed to 12 g / m 2, a coated white sheet paper in the same manner as in Example 1 It was.
  • Example 1 Comparative Example 1 In Example 1, the undercoat coating solution was applied with a bar blade at a coating amount of 16 g / m 2 and dried, and then the top coating solution was applied with a vent blade at an application amount of 8 g / m 2. A coated white paperboard was obtained in the same manner as in Example 1 except that drying was performed.
  • Example 2 the coated white paperboard was prepared in the same manner as in Example 1 except that the coating amount of the undercoat coating solution was 8 g / m 2 and the coating amount of the top coating solution was changed to 16 g / m 2. Obtained.
  • Example 1 even a base paper with low whiteness using deinked pulp as the surface layer has high whiteness, very little white unevenness, and high white paper and printing gloss.
  • Example 2 even if the base paper has a lower whiteness using undeinked pulp as the surface layer, the whiteness is sufficiently high and the whiteness unevenness is small as long as the whiteness of the base paper is within an appropriate range. Blank paper and high printing gloss.
  • Example 3 the whiteness, white unevenness, white paper, and printing glossiness are adjusted within a sufficiently high range by changing the coating amounts of the undercoat coating liquid and the topcoat coating liquid within an appropriate range. Can do.
  • Example 1 and Example 4 when Example 1 and Example 4 are compared, the whiteness of white paperboard can be improved by 3 points by using calcium carbonate having a sharp particle size distribution in the undercoat coating solution (Example 1). ). Furthermore, when Example 1 and Example 5 are compared, the use of calcium carbonate having a broad particle size distribution in the top coating liquid increases the voids in the outermost coating layer and increases the ink setting property of white paperboard. Excessiveness is suppressed, and the print glossiness is high (Example 1).
  • Comparative Example 1 not only the whiteness is significantly reduced but also white unevenness is remarkably generated due to the blade coating method.
  • the coating amount of the undercoat coating solution and the top coating solution is not within the appropriate range, and the coating amount of the undercoat coating solution that contributes to the improvement in whiteness due to high scattering properties is more than the appropriate range. Therefore, the whiteness is low.

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Abstract

La présente invention concerne un procédé à base de couchage par voile destiné à fabriquer un carton blanc couché ayant une prise d'encre adéquate et de bonnes caractéristiques de brillance d'impression tout en maintenant des caractéristiques supérieures de diffusion de la lumière par l'utilisation d'une épaisseur de couchage volumineuse ayant un certain nombre de pores. Le carton blanc ayant un haut degré de brillance d'impression, et une irrégularité de blancheur ou de blanc, peut être fabriqué de manière efficace même quand un stencil ayant un niveau de blancheur pouvant descendre de 40 % à 70 % est utilisé en enduisant de multiples épaisseurs de couchage de manière simultanée avec un film à un seul voile, et en limitant le poids de couchage d'une épaisseur de couchage supérieure et d'une épaisseur de couchage inférieure, qui sont les épaisseurs les plus à l'extérieur produites par le couchage par voile, jusqu'à un certain niveau.
PCT/JP2012/057296 2011-03-30 2012-03-22 Carton blanc couché et son procédé de fabrication Ceased WO2012133092A1 (fr)

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JP2014227634A (ja) * 2013-05-24 2014-12-08 北越紀州製紙株式会社 印刷用塗工紙
WO2016017313A1 (fr) * 2014-07-29 2016-02-04 三菱製紙株式会社 Papier enduit destiné à une impression au moyen d'imprimantes à jet d'encre industrielles et procédé de fabrication d'imprimés
JPWO2020203721A1 (fr) * 2019-03-29 2020-10-08
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JP2019090159A (ja) * 2013-03-28 2019-06-13 日本製紙株式会社 塗工白板紙およびその製造方法
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