WO2021029351A1 - Papier chargé de carbonate de calcium léger - Google Patents

Papier chargé de carbonate de calcium léger Download PDF

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Publication number
WO2021029351A1
WO2021029351A1 PCT/JP2020/030355 JP2020030355W WO2021029351A1 WO 2021029351 A1 WO2021029351 A1 WO 2021029351A1 JP 2020030355 W JP2020030355 W JP 2020030355W WO 2021029351 A1 WO2021029351 A1 WO 2021029351A1
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Prior art keywords
paper
calcium carbonate
light calcium
present
secondary particles
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PCT/JP2020/030355
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English (en)
Japanese (ja)
Inventor
光司 中山
加藤　進
吉松　丈博
大輔 永田
裕 津田
周平 稲田
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日本製紙株式会社
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Priority to JP2021539264A priority Critical patent/JP7029028B2/ja
Publication of WO2021029351A1 publication Critical patent/WO2021029351A1/fr

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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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments

Definitions

  • the present invention relates to paper containing light calcium carbonate.
  • a filler which is an inorganic substance, may be added to paper composed of cellulosic fibers, and the filler is used to improve optical properties, mainly whiteness and opacity, which tend to be insufficient with cellulosic fibers alone. Is added to.
  • the filler in recent years, in order to raise environmental awareness and reduce production costs, efforts have been made to reduce the amount of cellulosic fibers used as raw materials for wood and instead increase the filling rate in paper to increase the filling rate. There is.
  • the filler when the filler is added, the optical characteristics are improved, but the tensile strength, the tear strength, the degree of stekihito size, and the like are lowered.
  • chemicals such as paper strength enhancers and internal sizing agents are added to compensate for the reduced strength characteristics and sizing properties, but as the amount of chemicals used increases, not only does the burden on production costs increase. , The problem of internal dirt also occurs.
  • Patent Document 1 describes primary particles having an average particle size of 4.0 to 15.0 ⁇ m and a BET specific surface area of 5.0 to 10 m 2 / g as a filler and having needle-like and columnar shapes and / or theirs. It has been proposed to use light calcium carbonate consisting of aggregates.
  • Patent Document 2 describes a paper on which a filler is added, and the filler is light calcium carbonate having a secondary particle diameter of 1 to 10 ⁇ m, in which primary particles of spindle-shaped calcium carbonate are floc-aggregated. Therefore, light calcium carbonate having a BET specific surface area of 8 to 20 m 2 / g and a pore volume of 1.5 to 3.5 cm 3 / g has been proposed.
  • Patent Document 3 proposes to reduce the drying load during paper production by using rosetta-type calcium carbonate in which primary particles of spindle-shaped calcium carbonate are aggregated in a squid shape and talc as a filler. There is.
  • Patent Document 4 describes rosette-type light calcium carbonate in which primary particles are radially aggregated, having a BET specific surface area of 1.0 to 8.0 m 2 / g and an average particle diameter (D50) of 3.0. It is described that light calcium carbonate having a diameter of about 15.0 ⁇ m is added to the paper.
  • Patent Document 1 Since the shape of the primary particles of calcium carbonate described in Patent Document 1 is needle-like or columnar, the tip of the primary particles of light calcium carbonate is very thin when embedded in paper due to the characteristics of the shape, and the fiber. Since it easily enters the gap, it has a drawback that it hinders the formation of interfiber bonds of the paper and weakens the interlayer strength of the paper.
  • the light calcium carbonate of Patent Document 2 has the same problem as that of Patent Document 1 because the aspect of the primary particles is high.
  • calcium carbonate according to Patent Document 2 has a high specific surface area of secondary particles formed by floc aggregation, and in general, when a filler having a high specific surface area is used, the amount of paper chemicals adsorbed on the filler surface also increases. Therefore, in order to obtain a certain chemical addition effect, it is necessary to add more chemicals than when a filler having a low specific surface area is used.
  • Patent Document 3 describes that the dry load is reduced when talc is used in combination with rosette-type light calcium carbonate, but nothing has been examined regarding the relationship between the shape of rosetta-type light calcium carbonate and the strength of paper. Not.
  • Patent Document 4 describes that rosette-type light calcium carbonate is internally added to paper, there are cases where strike-through prevention during printing is not sufficient.
  • an object of the present invention is to provide a paper in which strike-through during printing is effectively suppressed and a decrease in strength is suppressed.
  • the present invention includes, but is not limited to, the invention of the following aspects.
  • the primary particles of light calcium carbonate are spherical with an aspect ratio of 2.5 or less, and are light carbon dioxide.
  • the above paper wherein the BET specific surface area of the secondary particles of calcium is 15 to 40 m 2 / g, and the average particle size of the secondary particles of light calcium carbonate is 3.0 to 15.0 ⁇ m.
  • FIG. 1 is an electron micrograph of light calcium carbonate (Sample 1).
  • FIG. 2 is an electron micrograph of light calcium carbonate (Sample 2).
  • FIG. 3 is an electron micrograph of light calcium carbonate (Sample 3).
  • FIG. 4 is an electron micrograph of light calcium carbonate (Sample 4).
  • the present invention relates to a paper filled with light calcium carbonate in which a large number of primary particles aggregate to form secondary particles.
  • Light Calcium Carbonate in which Primary Particles Aggregate to Form Secondary Particles In the present invention, light calcium carbonate having a specific average particle size and BET specific surface area is used.
  • the present inventors surprisingly effectively suppress strike-through during printing. We have found that paper with excellent strength characteristics such as tensile strength and tear strength can be obtained.
  • light calcium carbonate has a crystal system such as calcite type and aragonite type, and has various shapes such as columnar, needle-like, spindle-shaped, and cubic-shaped.
  • the light calcium carbonate according to the present invention has spherical primary particles. Aggregates to form secondary particles, and the shape of the secondary particles is special, so that the BET specific surface area is large.
  • light calcium carbonate is advantageous in terms of production cost and operability, and is also excellent in that paper having high opacity can be obtained with a low addition amount.
  • the light calcium carbonate of the present invention has a special shape, and when it is highly blended (internally added) to the base paper, the opacity of the base paper is greatly improved and strike-through is effectively prevented.
  • the light calcium carbonate of the present invention is characterized in that the average particle size of the secondary particles is relatively large, while the BET specific surface area is large. Generally, when comparing light calcium carbonates having the same particle shape and average particle size, the smaller the BET specific surface area, the larger the primary particles.
  • the light calcium carbonate according to the present invention spherical primary particles having a small aspect ratio are gathered to form secondary particles, so that the secondary particles have a porous structure. Therefore, it is considered that calcium carbonate adsorbs ink components during printing and suppresses excessive penetration of the ink into the paper, and as a result, strike-through is suppressed.
  • the light calcium carbonate used in the present invention is obtained by aggregating primary particles such as calcite-based calcium carbonate or aragonite-based calcium carbonate to form secondary particles, and is higher than other forms of calcium carbonate. It is characterized by its specific surface area and oil absorption.
  • the BET specific surface area of the light calcium carbonate of the present invention needs to be 15 to 40 m 2 / g. If it is less than 15 m 2 / g, the absorption of ink and water during printing is poor, and the effect of preventing strike-through may not be sufficient. Further, when the BET specific surface area exceeds 40 m 2 / g, the formation of interfiber bonds of the paper is inhibited, and the tensile strength and the tear strength are lowered.
  • the BET specific surface area is preferably 15.5 to 30 m 2 / g, more preferably 16 to 20 m 2 / g.
  • the light calcium carbonate of the present invention has an average particle diameter (D50) of secondary particles measured by a laser diffraction method of 3.0 ⁇ m or more and 15.0 ⁇ m or less.
  • D50 average particle diameter
  • the filler yield improves, but since the filler in the paper is localized, the tensile strength and tear strength tend to decrease and the strike-through prevention effect tends to decrease. Be done.
  • D50 is less than 3.0 ⁇ m, the filler distribution in the paper becomes uniform, but the filler tends to reduce the paper strength because the filler inhibits the interfiber bond in the paper, and the filler yield is low. As it worsens, the effect of preventing strike-through tends to decrease.
  • the D50 is preferably 3.5 ⁇ m or more, and more preferably 4.0 ⁇ m or more.
  • the upper limit of D50 is preferably 10.0 ⁇ m or less, and more preferably 8.0 ⁇ m or less.
  • the light calcium carbonate of the present invention has further excellent paper strength and physical characteristics when the particle size (d50) of 50% by volume of the particle size distribution curve measured by the X-ray transmission method is 2.0 to 5.0 ⁇ m. Preferably, 2.2 to 3.4 ⁇ m is particularly preferable.
  • the calcium carbonate according to the present invention has an extremely large number of primary particles aggregated to form secondary particles having a broccoli-like shape.
  • 100 or more primary particles are aggregated to form secondary particles, and the number of primary particles may be 500 or more or 1000 or more.
  • the upper limit of the number of primary particles is not particularly limited, but may be, for example, 100,000 or less, and 10,000 or less.
  • the calcium carbonate according to the present invention has a spherical primary particle shape.
  • the aspect ratio of the primary particles is 2.5 or less, preferably 1.0 to 2.3, more preferably 1.1 to 2.1, and even more preferably 1.2 to 1.9.
  • the particle size of the primary particles is preferably 0.1 to 1.0 ⁇ m, more preferably 0.2 to 0.75 ⁇ m, and even more preferably 0.3 to 0.5 ⁇ m.
  • the particle size and aspect ratio of the primary particles can be calculated by observing the shape using an electron microscope.
  • the method for producing light calcium carbonate is generally the "liquid-gas” method (carbon dioxide gas method) in which carbon dioxide gas is blown into a slaked lime slurry to react, and the "liquid-liquid” method (solubilized salt method) using sodium carbonate or the like.
  • the present invention does not particularly limit the method for producing light calcium carbonate, but a step of obtaining slaked lime by adding and mixing slaked water in a range where the molar ratio to quicklime is 2.5 or less by the above-mentioned "liquid-gas” method.
  • the light calcium carbonate produced through C) is the best because the desired particle shape, particle size, and BET specific surface area can be easily obtained.
  • Paper with light calcium carbonate embedded The paper of the present invention using a specific light calcium carbonate as a filler has good surface smoothness and excellent strength characteristics such as tensile strength without impairing the optical characteristics of the paper. Since it can effectively suppress strike-through during printing, it can be used for various purposes without any particular limitation.
  • Types of paper include various types of coating base paper, newspaper paper, high-quality and medium-quality paper, electrophotographic transfer paper, inkjet paper, heat-sensitive paper, pressure-sensitive paper, kraft paper, crimp recording paper, wrapping paper, and paper containers. Examples thereof include base paper, paperboard, wallpaper base paper, fiberboard base paper, photographic base paper, impregnation base paper, and flame-retardant paper.
  • the paper of the present invention is suitable as a printing paper used for various printing methods such as offset printing and gravure printing.
  • the paper impregnated with the light calcium carbonate of the present invention use as uncoated paper, coated base paper and coated paper, and transfer paper for electrophotographic will be described in detail.
  • the paper of the present invention is not limited to these uses.
  • the basis weight of the non-coated paper having no pigment coating layer, which is internally supplemented with the light calcium carbonate of the present invention as a filler, is not particularly limited, but the desired effect is exhibited at 30 to 650 g / g.
  • the range is about m 2 .
  • the basis weight of the uncoated paper according to the present invention is about 35 to 200 g / m 2 , and may be about 40 to 120 g / m 2 .
  • the light calcium carbonate of the present invention can be added to multi-layered paperboard, cardboard, and other thick papers that exceed this range.
  • Examples of the pulp used as a raw material for papermaking include bleached chemical pulp such as LBKP and NBKP, unbleached pulp such as LUKP and NUKP, crushed wood pulp (GP), pressurized crushed wood pulp (PGW), and refiner crushed wood pulp (Pulp).
  • RGP mechanical pulp such as thermomechanical pulp (TMP), deinked pulp (DIP), used paper pulp, waste paper and the like are appropriately mixed and used.
  • TMP thermomechanical pulp
  • DIP deinked pulp
  • used paper pulp waste paper and the like
  • one or more kinds of pulp fibers, synthetic pulps, inorganic fibers and the like obtained from non-wood fiber raw materials such as kenaf can be blended in the base paper.
  • Mechanical pulp, deinked pulp (DIP), and used paper pulp can be bleached and used as needed, and the degree of bleaching can be arbitrary.
  • the light calcium carbonate of the present invention is a commonly used filler, for example, heavy calcium carbonate, light calcium carbonate other than the present application, calcium sulfite, gypsum, talc, kaolin, engineered kaolin, calcined kaolin, white carbon, etc.
  • Inorganic fillers such as amorphous silica, delaminated kaolin, caustic soil, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, paper sludge, recycled inorganic particles from deinked floss, etc.
  • the light calcium carbonate of the present invention should be added to 100 parts by weight of the internal filler of the paper. It is preferably contained in an amount of 50 parts by weight or more, more preferably 60 parts by weight or more, and particularly preferably 70 parts by weight or more.
  • the ash content of the paper of the present invention is preferably 5% by weight or more, and 10% by weight. The above is more preferable.
  • the ash content exceeds 30% by weight problems such as wear of the wire and dirt in the paper machine system are likely to occur. Therefore, in general, it is preferable to add the filler in the range of 3 to 30% by weight, and it is particularly preferable to add the filler in the range of 5 to 20% by weight.
  • paper agents include internal sizing agents, anionic, nonionic, cationic or amphoteric yield improvers, drainage improvers, paper strength enhancers, dyes, fluorescent dyes, bulky agents, etc.
  • Various papermaking internal aids exemplified in the above can be used as needed.
  • Specific examples of the internal sizing agent include alkyl ketene dimer-based, alkenyl succinic anhydride-based, styrene-acrylic, higher fatty acid-based, petroleum resin-based sizing agent, rosin-based sizing agent, and the like.
  • the yield improver, drainage improver, and paper strength enhancer include polyvalent metal compounds such as aluminum (specifically, cellulose sulfate band, aluminum chloride, sodium aluminate, basic aluminum compound, etc.). , Various starches, cellulose nanofibers, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose derivatives such as methyl cellulose, polyacrylamide, urea resin, polyamide / polyamine resin, polyethyleneimine, polyamine, polyvinyl alcohol, polyethylene oxide and the like.
  • the paper containing the light calcium carbonate of the present invention has high chemical addition efficiency and excellent size expression.
  • the filler containing the light calcium carbonate of the present invention When adding the filler containing the light calcium carbonate of the present invention to the pulp raw material, it is preferable to add the filler while sufficiently stirring the pulp raw material, and examples of the addition location include a machine chest inlet and a fan pump suction port. Be done.
  • the papermaking conditions are not particularly limited, and the paper machine includes, for example, a long net paper machine, a twin wire paper machine, an on-top paper machine, a circular net paper machine, a short net paper machine, or the like on a commercial scale. Machines can be mentioned, and can be appropriately selected and used according to the purpose.
  • any method such as acidic papermaking, neutral papermaking, and weakly alkaline papermaking can be used, but since calcium carbonate dissolves in the acidic region, papermaking is performed in the range of neutral to weakly alkaline. Is desirable.
  • a surface treatment agent may be applied to the paper in order to improve the surface strength, impart water resistance, improve ink inking property, and the like.
  • the type of surface treatment agent is not particularly limited, but self-modification produced by thermochemical modification or enzyme modification in a paper factory using raw starch, oxidized starch, esterified starch, cationized starch, and acetylated tapioca starch as raw materials. It preferably contains starch such as starch, modified starch such as aldehyded starch and hydroxyethylated starch.
  • Cellulous derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose and cellulose nanofibers, modified alcohols such as polyacrylamide, polyvinyl alcohol, carboxyl-modified polyvinyl alcohol and acetoacetylated polyvinyl alcohol, styrene-butadiene copolymers, polyvinyl acetate and chloride. It is also possible to use a vinyl-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid ester and the like in combination.
  • a surface sizing agent such as a styrene-based sizing agent, an olefin-based sizing agent, an acrylate-based sizing agent, a styrene-acrylic sizing agent, and a cationic sizing agent in combination.
  • various auxiliary agents blended in ordinary clear coating such as a dispersant, a thickener, a water retaining material, a defoaming agent, a water resistant agent, a coloring agent, and a conductive agent are appropriately used, if necessary. used.
  • a known size press apparatus for example, a 2-roll type, a 3-roll type, a gate roll type, a film transfer type, or the like can be used.
  • the film transfer type is a method in which a coating film in a wet state is formed on an applicator roll and the coating film is transferred to the surface of a base paper. Examples thereof include a transfer roll coater and a rod metering size press coater. Further, the coating may be applied using a coater (coating machine) such as a curtain coater, a spray coater, or a blade coater.
  • the surface treatment coating liquid may be applied on both sides.
  • the paper containing the light calcium carbonate of the present invention may be used as the coating base paper, and the coating paper having at least one coating layer containing a pigment and an adhesive as main components may be used.
  • the interlayer strength is improved, so that excellent blister suitability and good sizing development can be obtained, so that a coated paper having excellent surface smoothness can be obtained.
  • the above-mentioned paper on which light calcium carbonate is added and coated with a coating liquid containing a surface treatment agent may be used as a coating base paper.
  • a coating base paper By applying this surface treatment, there is an effect of improving the surface strength of the coated base paper or cleaning foreign substances on the surface of the coated base paper, and it is possible to suppress the occurrence of streaks and the like.
  • surface treatment is performed in order to avoid restrictions on drying capacity and the risk of paper breakage. May be omitted.
  • the coating base paper can also be smoothed and finished by a machine calendar, a soft calendar, or the like.
  • the pigment used for the coating layer is not particularly limited, and pigments used in the ordinary field of coated paper, for example, heavy calcium carbonate, light calcium carbonate of the present invention or other, calcium sulfite, gypsum , Tarku, Kaolin, Engineered Kaolin, Calcined Kaolin, White Carbon, Amorphous Silica, Delaminated Kaolin, Keisou Soil, Magnesium Carbonate, Titanium Dioxide, Aluminum Hydroxide, Calcium Hydroxide, Magnesium Hydroxide, Zinc Hydroxide, Papermaking Inorganic pigments such as sludge and recycled inorganic particles from deinked floss, urea formalin resin, vinyl chloride resin, polystyrene resin, urea / formalin resin, melamine resin, styrene / butadiene copolymer resin, phenol resin, plastic hollow
  • an adhesive used in the field of ordinary coated paper and various surface treatment agents used as a surface treatment agent in the non-coated paper are used as an adhesive. You may. In addition, these adhesives can be used alone or in combination of two or more.
  • the amount of the adhesive to be blended is not particularly limited, but 1 to 50 parts by weight, preferably 5 to 30 parts by weight, is blended per 100 parts by weight of the pigment. Also, if necessary, colored dyes, colored pigments, fluorescent whitening dyes, thickeners, water retention agents, antioxidants, antioxidants, conductivity inducers, defoamers, UV absorbers, dispersants, pH adjustments. Various auxiliary agents such as agents, mold release agents, water resistant agents, and water repellent agents can be appropriately blended.
  • the solid content concentration of the pigment coating liquid can be selected in the range of 25 to 80% by mass. Considering the adjustment of the coating amount and the operability, the range of 50 to 70% by mass is desirable.
  • the coating layer provided on the coating base paper is not particularly limited as to one layer or two or more layers. In the case of multiple layers, not all need to be the same and can be appropriately adjusted according to the required quality level. Further, the amount of coating of the coating layer is not particularly limited, and can be adjusted according to the blank paper quality, printing quality, etc. of the coated paper, but generally, 0. It is about 5 to 40.0 g / m 2 .
  • various coating devices used in the ordinary field of coated paper manufacturing such as an air knife coater, various blade coaters, gate roll coaters, and roll coaters. , Die coater, curtain coater, spray coater and the like can be appropriately used.
  • the coating layer is dried to obtain a coated paper.
  • a drying method for example, a usual method such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, or a cylinder dryer can be arbitrarily selected and used.
  • the coated paper thus obtained may be passed through various publicly known and public finishing devices such as a super calendar, a gloss calendar, a soft calendar, a mat calendar, etc. to finish the product.
  • various publicly known and public finishing devices such as a super calendar, a gloss calendar, a soft calendar, a mat calendar, etc. to finish the product.
  • the transfer paper for electrophotographic can be produced using the paper containing the specific light calcium carbonate of the present invention.
  • the interlayer strength is improved, so that it is possible to obtain an electrophotographic transfer paper in which curling and paper dust are less likely to occur during printing.
  • the light calcium carbonate of the present invention does not easily wear the wire of the paper machine, it can be used for paper making using a general paper machine.
  • the paper machine used for making transfer paper for electrophotographic is preferably a hybrid former or an on-top former having a double-sided dehydration mechanism, but the present invention is not limited thereto.
  • the pulp raw material for the electrophotographic transfer paper produced in the present invention is not particularly limited, as long as it is generally used as a papermaking raw material, such as various pulps exemplified for uncoated paper. Good. Above all, from the environmental point of view, it is desirable that more deinked pulp and used paper pulp are used.
  • the light calcium carbonate of the present invention can be used alone or in combination with other papermaking fillers.
  • the known fillers exemplified for uncoated paper can be used alone or in combination of two or more as appropriate.
  • the mixing ratio can be adjusted according to the quality of the paper, and in order to reduce curl and paper dust during printing and suppress wire wear during papermaking, the specific light calcium carbonate of the present invention is applied to the paper. It is preferable to contain 50 parts by weight or more, more preferably 60 parts by weight or more, and particularly preferably 70 parts by weight or more in 100 parts by weight of the internal filler.
  • the ash content in the paper if it is less than 3% by weight, the optical characteristics of the paper, mainly whiteness and opacity, tend to be insufficient. Therefore, it is preferably 5% by weight or more, and more preferably 10% by weight or more.
  • the transportability double feeding, jam trouble, etc.
  • the surface treatment agent may be applied on the transfer paper for an electrophotographic train in which the specific light calcium carbonate of the present invention is added.
  • the surface treatment agent the surface treatment agent exemplified in the above-mentioned non-coated paper may be used.
  • an inorganic conductive agent such as sodium chloride, sodium sulfate, or potassium chloride or an organic conductive agent such as dimethylaminoethyl methacrylate is added as a conductive agent to the outside. It is preferable to apply it as a companion.
  • the coating amount of the surface treatment agent containing the conductive agent is appropriately adjusted, but the usual coating amount is about 0.5 to 4.0 g / m 2 on both sides.
  • the amount of the conductive agent applied is about 0.02 to 0.5 g / m 2 on both sides.
  • the basis weight of the electrophotographic transfer paper of the present invention can be, for example, 40 to 80 g / m 2, and the physical properties may be adjusted to a level having a friction coefficient or the like of a normal electrophotographic transfer paper.
  • Experiment 1 Production and evaluation of light calcium carbonate
  • Light calcium carbonate was synthesized by the carbon dioxide gas method. Specifically, the calcined quicklime is mixed and reacted with water to obtain a carbon dioxide solution (lime), the lime is cooled to an appropriate temperature with a heat exchanger, and then an organic acid (auxiliary agent) is added. Then, carbon dioxide gas was blown into the tank, which is a reaction vessel, while stirring to obtain light calcium carbonate of Samples 1 to 12.
  • the table below shows the lime concentration, organic acid (auxiliary) addition rate, carbonation start temperature, and carbonation time.
  • the obtained calcium carbonate was evaluated by the following evaluation method.
  • (4) Aspect ratio of primary particles The sample was magnified and observed with an electron microscope, and the lengths of the long and short sides were measured for 10 to 20 randomly selected primary particles, and the average value of this ratio was calculated. Adopted.
  • the plate wear characteristics were evaluated by measuring the softness of light calcium carbonate using an Einlaner AT-1000 wear tester. Specifically, the long net brass wire screen standard attached to the wear tester is exposed to a 10% light calcium carbonate suspension for 174,000 revolutions. The weight of the long net wire screen before and after the treatment was measured, and the wear weight (milligram) of the long net wire screen was calculated from the difference.
  • the evaluation criteria are as follows.
  • the aspect ratio of the primary particles is set to the conditions that inhibit the growth of the primary particles (low lime concentration, high organic acid addition rate, low carbonation start temperature, short carbonation time).
  • Low lime concentration, high organic acid addition rate, low carbonation start temperature, short carbonation time could be a low light calcium carbonate.
  • Experiment 2 Manufacture and evaluation of calcium carbonate inner paper In a pulp slurry composed of 100% bleached kraft pulp (LBKP, CSF: 360 ml), aluminum sulfate 0.5% and ash content in paper with respect to the total solid content of the pulp slurry. Light calcium carbonate (Samples 1 to 12 of Experiment 1) was added so that the value was 10%, and the paper material was prepared.
  • a hand-made paper having a basis weight of about 60 g / m 2 was prepared according to JIS P 8222 using a circular hand-making machine.
  • the paper was obtained by drying with a lab-scale cylinder dryer instead of the method of bringing the wet paper into close contact with the metal plate specified in JIS P 8222.
  • the particle size (secondary particle size) of light calcium carbonate is larger than that of Sample 2 and Sample 4 (Comparative Example), so that the filler inhibits the interfiber bond in the paper. It was difficult to reduce the paper strength (tensile strength).

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

La présente invention vise à résoudre le problème de la fourniture d'un papier qui est efficacement supprimé lors de l'impression, tout en ayant une excellente résistance.　La présente invention concerne un papier chargé de carbonate de calcium léger, dans lequel des particules primaires s'agrègent pour former des particules secondaires. Les particules primaires du carbonate de calcium léger présentent une forme sphérique dont le rapport d'aspect est de 2,5 ou moins ; et les particules secondaires du carbonate de calcium léger présentent une surface spécifique BET de 15 à 40 m2/g et un diamètre moyen de particule de 3,0 µm à 15,0 µm.
PCT/JP2020/030355 2019-08-15 2020-08-07 Papier chargé de carbonate de calcium léger WO2021029351A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07197398A (ja) * 1994-11-21 1995-08-01 Okutama Kogyo Kk 凝集炭酸カルシウム及び製紙用顔料
WO2001030700A1 (fr) * 1999-10-26 2001-05-03 Yabashi Industries Co., Ltd. Carbonate de calcium et son procede de production
JP2008156204A (ja) * 2006-11-30 2008-07-10 Okutama Kogyo Co Ltd 軽質炭酸カルシウム、その製造方法およびそれを用いた印刷用紙
JP2010077573A (ja) * 2008-09-29 2010-04-08 Daio Paper Corp オフセット印刷用新聞用紙
JP2013060692A (ja) * 2011-08-23 2013-04-04 Oji Holdings Corp 填料用軽質炭酸カルシウムおよびその内填紙
WO2018019701A1 (fr) * 2016-07-25 2018-02-01 Omya International Ag Production de carbonate de calcium amorphe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07197398A (ja) * 1994-11-21 1995-08-01 Okutama Kogyo Kk 凝集炭酸カルシウム及び製紙用顔料
WO2001030700A1 (fr) * 1999-10-26 2001-05-03 Yabashi Industries Co., Ltd. Carbonate de calcium et son procede de production
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