WO2011122599A1 - 印刷用塗工紙の製造方法 - Google Patents
印刷用塗工紙の製造方法 Download PDFInfo
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- WO2011122599A1 WO2011122599A1 PCT/JP2011/057746 JP2011057746W WO2011122599A1 WO 2011122599 A1 WO2011122599 A1 WO 2011122599A1 JP 2011057746 W JP2011057746 W JP 2011057746W WO 2011122599 A1 WO2011122599 A1 WO 2011122599A1
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- Prior art keywords
- coating
- paper
- printing
- coating liquid
- spray
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Classifications
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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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
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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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/32—Thermal receivers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/34—Both sides of a layer or material are treated, e.g. coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
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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
- D21H23/50—Spraying or projecting
Definitions
- the present invention relates to a method for producing a coated paper for printing that can obtain good print quality by spray coating.
- coated paper for printing is manufactured by coating a base paper with a pigment coating solution containing pigments and adhesives as the main components, followed by drying. Depending on the method, it is classified into cast coated paper, art paper, coated paper, fine coated paper, and the like. These coated papers for printing are subjected to multicolor printing or single color printing and are widely used as commercial printed materials such as leaflets, brochures, and posters, or as publications such as books and magazines. In recent years, color offset printing has become widespread, and printing quality such as printing surface feeling and printing glossiness of coated paper for printing is more important than ever.
- the coating layer can be coated flat on the paper, and a coated paper having high smoothness and high white paper gloss can be obtained.
- the blade coating method is a coating method that flattens unevenness on the surface of the base paper that is pressed into the base paper under pressure when the coating liquid passes through the blade, so that the fibers of the base paper are completely covered This requires a large amount of coating.
- an unnecessarily large coating liquid is applied, which is not preferable when reducing the weight of the paper.
- the roll transfer method can obtain a coating layer along the unevenness of the surface of the base paper, and can reduce the coating amount as compared with the blade method.
- this coating method has a problem that mist is generated during high-speed coating, and it cannot be said that it is sufficiently compatible with recent increases in the speed of paper machines and coating machines. Further, when the coating amount is small, it is difficult to sufficiently cover the base paper.
- the spray coating method is, for example, a method in which a coating fluid is sprayed on the surface of paper from a single fluid nozzle called airless spray to coat the paper.
- This system is characterized in that the base paper and the coating head do not contact each other, and the load on the base paper during coating is small. Therefore, compared with the conventional coating method, high-speed coating is possible, and good operability can be obtained without causing problems due to contact between the base paper and the coating head.
- the contour coating method it is possible to coat the base paper with a smaller coating amount than blade coating and roll transfer coating.
- the spray coating method can realize more efficient coating than the conventional coating method.
- the spray coating method forms a coated surface along the unevenness of the surface of the base paper compared to the blade method and roll transfer method, so the printing quality such as the printing surface feeling is inferior, and the coated paper manufacturing method is It is hard to say that the method of its use has been fully studied.
- the manufacturing method of the coating paper for offset printing which has a high blank paper glossiness and low air permeability which provides one or more coating layers only by spray coating is disclosed (refer patent document 1). Even with this method alone, even if a high white paper glossiness is obtained by calendering or the like, it is not possible to improve the deterioration of the feeling after printing due to the unevenness of the base paper.
- Patent Documents 2 and 3 it is disclosed in Patent Documents 2 and 3 that a spray method is used for undercoat coating of multilayer coating.
- a spray method is used for undercoat coating of multilayer coating.
- they use a spray coating having a good covering property for the under layer.
- the top layer coating uses a contact type coating method such as a blade method, the paper making speed cannot be increased, and there are problems such as problems caused by contact between the blade and the base paper.
- the method described in the patent document cannot be said to make use of the advantages of non-contact type spray coating.
- JP 2005-68614 A Japanese Patent Laid-Open No. 2007-10023 JP 2008-179915 A
- an object of the present invention is to produce a coated paper for printing capable of obtaining good printing quality by spray coating.
- the subject is the following present invention: A method for producing a coated paper for printing having at least one coating layer on at least one side of a base paper, A coating liquid containing a pigment and an adhesive containing starch, wherein (a) the starch is contained in an amount of 30 to 100% by weight in the total adhesive, and (b) measured at 30 ° C. and 100 rpm.
- the present invention it is possible to provide a method for producing a coated paper for printing which can obtain a printing quality such as good printing glossiness and printing surface feeling by using spray coating.
- a printing quality such as good printing glossiness and printing surface feeling by using spray coating.
- high-speed coating is possible, productivity is improved, and manufacturing costs can be reduced.
- the present invention is a coating liquid comprising a pigment and an adhesive containing starch, comprising (a) 30 to 100% by weight of the starch in the total adhesive, and (b) 30 ° C., A spray coating liquid having a B-type viscosity of 300 mPa ⁇ s or less measured at 100 rpm is prepared, and the coating liquid is spray-coated to form an outermost coating layer.
- a spray coating liquid having a B-type viscosity of 300 mPa ⁇ s or less measured at 100 rpm is prepared, and the coating liquid is spray-coated to form an outermost coating layer.
- the present invention conventionally, by increasing the water retention of the coating liquid by blending the starch, which has been avoided to use because the viscosity increases, into the coating liquid, the spreading of the coating liquid on the base paper is increased.
- the outermost coating layer which is the outermost coating layer among the coating layers formed on the base paper is formed by spray coating.
- the outermost coating layer is a coating layer that is farthest from the base paper, and is also simply referred to as the outermost layer hereinafter.
- the spray coating layer is one layer, the coating layer is the outermost coating layer.
- Other coating layers may be formed by a method other than the spray coating method, but high operability can be obtained by forming all the coating layers by spray coating. Unless otherwise specified, the spray coating layer in this specification means the outermost coating layer.
- a preferable coating speed is 1000 to 3000 m / min, more preferably 1300 m to 3000 m / min, and further preferably 1500 to 3000 m / min.
- Spray coating can be performed either on-machine or off-machine.
- air spray or airless spray can be used, but airless spray can pressurize the coating liquid and spray at high speed, and the fine coating liquid due to the shear stress due to the contact between the coating film and the atmosphere.
- the droplets can be spread in a good state on the paper surface.
- airless spraying is preferable because it can reduce contamination at the nozzle tip.
- the pressure when spraying the coating liquid from the spray nozzle is preferably 5 MPa (50 bar) or more.
- the upper limit of the pressure is preferably 20 MPa (200 bar) or less.
- the diameter (inner diameter) of the spray nozzle is preferably 0.20 to 0.60 ⁇ m, and more preferably 0.30 to 0.60 ⁇ m.
- the diameter is less than this lower limit, it is difficult to discharge the coating liquid, and when the diameter exceeds this upper limit, dripping or the like tends to occur.
- the printing surface feeling is improved.
- a coating liquid having a solid content concentration of 60% by weight or less is spray-coated at the pressure using the nozzle, the printing surface feeling is further improved.
- the coating is preferably performed by installing a plurality of spray nozzles at intervals, and the preferred distance between the nozzle tip and the paper surface at that time is 90 to 110 mm. Outside this range, uncoated portions tend to occur, and defects such as interference between coating liquids from adjacent nozzles tend to occur, making it difficult to obtain a good coated layer surface.
- the coating amount of the coating layer formed by spray coating and dried preferably exceeds 3.0 g / m 2 per side, and is 6.0 g / m 2. The above is more preferable. A coating amount of 3.0 g / m 2 or less is not preferable because the surface of the coated paper is inferior. Further, the coating weight is preferably from 15.0 g / m 2 or less, more preferably 12.0 g / m 2. When the coating amount is more than 15.0 g / m 2 , the weight of the paper becomes heavy, which is not preferable.
- pigment used in the coating layer of the present invention those conventionally used as coating pigments for paper can be used.
- the types of these pigments include inorganic calcium pigments such as heavy calcium carbonate, light calcium carbonate, clay, kaolin, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white.
- organic pigments such as plastic pigments.
- calcium carbonate more preferably heavy calcium carbonate.
- the content of heavy calcium carbonate is preferably 50% by weight of the total pigment, more preferably 90% by weight or more, and still more preferably 100% by weight.
- the adhesive used in the present invention contains starches.
- the starch is a natural polymer obtained by polymerizing a number of ⁇ -glucose molecules by glycosidic bonds or a modified one thereof.
- the water retention of the coating solution is maintained by the starch, and the base paper surface can be sufficiently covered.
- Specific starches include oxidized starch, cationized starch, urea phosphated starch, and hydroxyethyl etherified starch.
- the content of starch is 30 to 100% by weight, preferably 50 to 100% by weight, more preferably 60 to 100% by weight, based on the total amount of adhesive.
- a preferable range of the amount of dehydration is 100 ml or less. However, if the content is less than 30% by weight, the water retention of the coating liquid is inferior, so that the coverage of the base paper is lowered.
- an adhesive conventionally used for coated paper can be used.
- These adhesives include various copolymers such as styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, polyvinyl alcohol, and maleic anhydride.
- Examples include synthetic adhesives such as copolymers, acrylic acid / methyl methacrylate copolymers, proteins such as casein, soy protein, and synthetic proteins, and cellulose derivatives such as carboxymethyl cellulose, hydroxymethyl cellulose, and hydroxyethyl cellulose. You may use together.
- the total amount of all adhesives in the spray coating layer is preferably 5 to 30 parts by weight, more preferably 5 parts by weight or more and less than 20 parts by weight with respect to 100 parts by weight of the pigment.
- the total amount of the adhesive exceeds 30 parts by weight, the viscosity of the coating liquid becomes high, and there may be disadvantages such as operability problems such as difficulty in passing through pipes and screens, and cost increases.
- the total amount of the adhesive is 20 parts by weight or more, the ratio of the pigment contained in the coating liquid is relatively low, which is not preferable because the print quality tends to deteriorate.
- the total amount of the adhesive is less than 5 parts by weight, a sufficient surface strength cannot be obtained, which is not preferable.
- content of the pigment in a coating liquid is securable by making the total amount of an adhesive agent below into a fixed amount in this way.
- auxiliaries such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, dyes and fluorescent dyes can be used as auxiliaries.
- the B type viscosity of the coating liquid used for spray coating of the present invention is 300 mPa ⁇ s or less.
- the viscosity is 300 mPa ⁇ s or less, the blank surface feeling and the printing surface feeling of the coated paper for printing obtained are improved, and the operability is also improved.
- the viscosity is higher than 300 mPa ⁇ s, the coating liquid does not spread sufficiently to the paper surface after colliding with the paper, resulting in coating unevenness and the like, resulting in poor white paper feeling and post printing surface feeling.
- the viscosity is preferably 30 mPa ⁇ s or more.
- the B type viscosity of the coating liquid is measured at a rotation speed of 100 rpm and 30 ° C. using a rotor corresponding to the viscosity.
- the viscosity of the coating solution can be adjusted mainly by the solid content concentration in the coating solution.
- the solid content concentration is preferably 70% by weight or less, more preferably 60% by weight or less, and further preferably 50% by weight or less.
- the solid content concentration is preferably 30% by weight or more. Solid content concentration is calculated
- the base paper used in the present invention contains pulp, filler, and various auxiliaries. Although it does not specifically limit as a pulp, A chemical pulp, a semichemical pulp, a mechanical pulp, a used paper pulp etc. can be used, These can be used properly according to the objective suitably.
- the filler used for the base paper should be a known filler such as light calcium carbonate, heavy calcium carbonate, talc, kaolin, clay, silica, amorphous silicate, titanium oxide, synthetic resin filler, and light calcium carbonate-silica composite. Can do.
- the blending amount of the filler into the base paper is not particularly limited, but can be about 3 to 40% by weight with respect to the dry weight of the pulp.
- Paper can be added within the range.
- the paper making method of the base paper is not particularly limited, and can be prepared by an acidic paper making method, a neutral paper making method, and an alkali paper making method using a long net machine including a top wire, a round net machine, and a gap former machine. Further, a base paper or the like preliminarily coated with starch, polyvinyl alcohol or the like using a size press, a gate roll coater, a bill blade or the like can also be used.
- the coating base paper those having a basis weight of about 25 to 400 g / m 2 used for general coated paper can be used. From the viewpoint of the balance weight and quality, the basis weight of the coating base paper is preferably 30 ⁇ 180g / m 2, more preferably 30 ⁇ 80g / m 2.
- a wet coating layer is formed by spray coating on the base paper or the coating layer provided on the base paper.
- a method for drying the wet coating layer for example, usual methods such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, and a cylinder dryer are used.
- the coated coated paper produced in the present invention may be subjected to a smoothing process by a calendar process such as a super calender or a high temperature soft nip calender.
- the ash content and density of the printing coated paper obtained in the present invention are not particularly limited, and may be within the range of ordinary printing coated paper.
- Dynamic water retention measurement method Device name: Use a water retention meter manufactured by Kaltec Scientific, 30 ° C., pressure 0.5 Bar , Measurement was performed using a designated film (filter) “AA-GWR Test Filters (KALTEC SCIENCE, INC.), GWR420” under the condition of a liquid volume of 20 ml for 40 seconds. The smaller this value, the higher the dynamic water retention.
- Example 1 Preparation of spray coating liquid 1 As a pigment, 100 parts of heavy calcium carbonate slurry (FMT-90, manufactured by PMMA Tech Co., Ltd.) and as an adhesive, an alkali thickened styrene-butadiene copolymer latex ( After adding 6 parts of glass transition temperature -20 ° C., gel content 85%) and 4 parts of hydroxyethylated starch (Etilex 2005 manufactured by Sanwa Starch Co., Ltd.), water is added and spray coating is performed with a solid content concentration of 50%. A working liquid 1 was obtained. The B-type viscosity of this coating solution was 30 mPa ⁇ s.
- a high-quality paper containing 7% light calcium carbonate as a filler per weight of the base paper and 100% chemical pulp as a papermaking pulp and having a basis weight of 40 g / m 2 and a density of 0.7 g / cm 3 was used.
- An airless spray coater (coating condition: spraying pressure condition: on the above base paper) at a coating speed of 1500 m / min so that the coating amount per side of the above-mentioned spray coating liquid 1 is 7 g / m 2.
- Double-sided coating was performed using 8 MPa (80 bar), nozzle interval: 60 mm, distance between nozzle and paper surface: 100 mm, nozzle diameter: 0.5 ⁇ m, and then dried so that the moisture content of the coated paper was 6%. .
- Example 2 A coating liquid was prepared by adding 6 parts of the hydroxyethylated starch (Echilex 2005, manufactured by Sanwa Starch Co., Ltd.) as the spray coating liquid 1, and a coated paper for printing was obtained in the same manner as in Example 1. .
- the B-type viscosity of this coating solution was 50 mPa ⁇ s.
- Example 3 Add 4 parts of alkali thickening type styrene-butadiene copolymer latex (glass transition temperature -20 ° C, gel content 85%) of spray coating liquid 1, hydroxyethylated starch (Echilex manufactured by Sanwa Starch Co., Ltd.) 2005) A coating liquid having 8 parts was prepared, and a coated paper for printing was obtained in the same manner as in Example 1. The B type viscosity of this coating solution was 90 mPa ⁇ s.
- Example 4 A coating liquid containing only 16 parts of hydroxyethylated starch (Echilex 2005, manufactured by Sanwa Starch Co., Ltd.) as the adhesive of spray coating liquid 1 was prepared, and a coated paper for printing was obtained in the same manner as in Example 1. It was.
- the B-type viscosity of this coating liquid was 300 mPa ⁇ s.
- Example 5 A coating solution having a solid content concentration of the spray coating solution 1 of 48% was prepared, and a coated paper for printing was obtained in the same manner as in Example 1.
- the B-type viscosity of this coating solution was 8 mPa ⁇ s.
- Example 6 A coating liquid with a solid content concentration of spray coating liquid 1 of 55% was prepared, and a coated paper for printing was obtained in the same manner as in Example 1.
- the B type viscosity of this coating solution was 80 mPa ⁇ s.
- Example 7 A coating liquid having a solid content concentration of spray coating liquid 1 of 60% was prepared, and a coated paper for printing was obtained in the same manner as in Example 1.
- the B-type viscosity of this coating liquid was 300 mPa ⁇ s.
- Example 8 A coated paper was obtained in the same manner as in Example 3 except that the spray pressure was 5 MPa (50 bar) so that the coating amount per side was 3 g / m 2 .
- Example 9 A coated paper was obtained in the same manner as in Example 1 except that the nozzle diameter of the airless spray coater was 0.3 ⁇ m and the spray pressure condition was 12 MPa (120 bar).
- Example 10 In the coating solution prepared in Example 6, except that 75 parts of heavy calcium carbonate slurry (FMT-90 manufactured by PMMA TECH) and 25 parts of fine clay (Khydra Hydra gloss) were used as pigments. A coated paper for printing was obtained in the same manner as in Example 6. The B type viscosity of this coating solution was 90 mPa ⁇ s.
- Example 11 12 parts of alkali-thickening type styrene-butadiene copolymer latex (glass transition temperature -20 ° C., gel content 85%), hydroxyethylated starch (Echirex 2005 manufactured by Sanwa Starch Co., Ltd.) ) was prepared as 8 parts, and a coated paper for printing was obtained in the same manner as in Example 1.
- the B type viscosity of this coating liquid was 120 mPa ⁇ s.
- Example 1 A coating liquid was prepared by using only 8 parts of the adhesive of spray coating liquid 1 as an alkali-thickening type styrene-butadiene copolymer latex (glass transition temperature-20 ° C., gel content 85%). A coated paper for printing was obtained in the same manner as above. The B-type viscosity of this coating solution was 10 mPa ⁇ s.
- Spray coating liquid 1 is coated with 8 parts of alkali-thickened styrene-butadiene copolymer latex (glass transition temperature -20 ° C, gel content 85%) and a solid content of 60%. A liquid was prepared, and a coated paper for printing was obtained in the same manner as in Example 1. The B type viscosity of this coating solution was 60 mPa ⁇ s.
- Example 3 A coating liquid with a solid content concentration of the spray coating liquid 1 of 65% was prepared, and a coated paper for printing was obtained in the same manner as in Example 1.
- the B-type viscosity of this coating solution was 1000 mPa ⁇ s.
- Example 4 A coating paper for printing was obtained in the same manner as in Example 1 except that a coating liquid having a solid content concentration of 65% was prepared and applied using the blade method.
- the B-type viscosity of this coating solution was 1000 mPa ⁇ s.
- Example 5 A coating paper for printing was obtained in the same manner as in Example 1 except that a coating liquid having a solid content concentration of 63% was prepared and applied using the GRC method. The B type viscosity of this coating solution was 750 mPa ⁇ s.
- Table 1-1 and Table 1-2 show the evaluation results.
- Example 1 From the results shown in Table 1-1, it is clear that in Examples 1 to 10, it is possible to produce a coated paper for printing having excellent printing surface feeling and high printing gloss by spray coating.
- delta gloss tends to be high.
- Example 8 when the coating amount is low, the printing surface feeling tends to be slightly inferior.
- Example 9 since the nozzle diameter was reduced and the discharged particles were reduced, the printing surface feeling, printing gloss, and delta gloss were improved.
- Example 10 Since the coating liquid used in Example 10 contains clay as a pigment, it has a slightly higher viscosity than the coating liquid of Example 6 that does not contain clay, and the printing surface feeling and delta gloss of the resulting coated paper are also high. There was a tendency to decrease slightly. Moreover, in Example 11, although the operativity was excellent, the tendency for the printing surface feeling to fall a little was seen. This is presumably because the blending ratio of the pigment was relatively low because the total amount of the adhesive was large.
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Abstract
Description
原紙の少なくとも片面に1以上の塗工層を有する印刷用塗工紙の製造方法であって、
顔料と、澱粉類を含む接着剤と、を含有する塗工液であって、(a)前記澱粉類を全接着剤中30~100重量%含み、かつ(b)30℃、100rpmで測定したB型粘度が300mPa・s以下であるスプレー塗工液を調製する工程、
当該塗工液をスプレー塗工して最外塗工層を形成する工程を含む、前記製造方法により解決される。
本発明では、原紙上に形成される塗工層のうち、最も外側の塗工層である最外塗工層をスプレー塗工にて形成する。最外塗工層とは、原紙から最も離れた塗工層であり、以下単に最外層ともいう。スプレー塗工層が1層の場合は、当該塗工層が最外塗工層となる。他の塗工層は、スプレー塗工方式以外の方式で形成されてもよいが、総ての塗工層をスプレー塗工で形成すると高い操業性が得られる。特に断らない限り、本明細書においてスプレー塗工層とは最外層塗工層を意味する。
スプレー塗工方式は高速塗工適性に優れているため、非常に効率よく塗工紙を生産できる。好ましい塗工速度の範囲は1000~3000m/分であり、より好ましくは1300m~3000m/分、さらに好ましくは1500~3000m/分である。1000m/分以上、より好ましくは1500m/分以上で塗工することにより、紙と塗工液が衝突した際、紙の高速移動により塗工液中の顔料が紙の表面に沿って配向しやすく平滑性が向上する。さらに、この衝撃により塗工液が広がりやすくなり原紙の被覆性が向上する。
本発明の塗工層に用いる顔料としては、従来から紙の塗工顔料として用いられるものを使用することができる。これらの顔料の種類としては、重質炭酸カルシウム、軽質炭酸カルシウム、クレー、カオリン、タルク、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、珪酸、珪酸塩、コロイダルシリカ、サチンホワイト等の無機顔料や、プラスチックピグメント等の有機顔料が挙げられる。
本発明において用いる接着剤は、澱粉類を含有する。澱粉類とは、多数のα-グルコース分子がグリコシド結合によって重合した天然高分子またはこれを変性したものである。澱粉により塗工液の保水性が保たれ、原紙表面を十分に被覆することができる。具体的な澱粉類としては、酸化澱粉、カチオン化澱粉、尿素リン酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などが挙げられる。澱粉類の含有量は、全接着剤量中30~100重量%であるが、好ましくは50~100重量%、さらに好ましくは60~100重量%である。塗工液の保水性を高める作用のある澱粉類の接着剤中の配合率を高くすることにより、塗工液が原紙上に広がりきる前に沈み込むことによって生じる塗工ムラを抑制し、印刷面感、印刷光沢を向上することができる。また、塗工液の保水性が向上することにより塗工液の脱水量も減少する。そのため、脱水量の好ましい範囲としては、100ml以下である。しかしながら、前記含有量が30重量%より少ないと塗工液の保水性が劣るので原紙の被覆性が低下する。
本発明のスプレー塗工に用いる塗工液のB型粘度は、300mPa・s以下である。粘度が300mPa・s以下であると得られる印刷用塗工紙の白紙面感、印刷面感が向上し、さらに操業性も良好になる。粘度が300mPa・sより高い場合は、塗工液が紙に衝突した後に紙表面に対して十分に拡がらず塗工ムラ等が発生して白紙面感、印刷後面感に劣る。しかしながら粘度が低すぎると被覆性が低下するので、粘度は30mPa・s以上が好ましい。塗工液のB型粘度は、その粘度に応じたローターを用いて、100rpmの回転速度、30℃で測定される。
本発明で用いる原紙は、パルプと填料と各種助剤とを含む。パルプとしては、特に限定されないが、化学パルプ、半化学パルプ、機械パルプ、古紙パルプ等を用いることができ、これらを適宜目的に応じて使い分けることができる。
本発明では、前記原紙または原紙の上に設けられた塗工層の上に、スプレー塗工により湿潤塗工層を形成する。湿潤塗工層を乾燥させる手法としては、例えば、蒸気加熱ヒーター、ガスヒーター、赤外線ヒーター、電気ヒーター、熱風加熱ヒーター、マイクロウェーブ、シリンダードライヤー等の通常の方法が用いられる。
本発明で製造された印刷用塗工紙は、スーパーカレンダー、高温ソフトニップカレンダー等のカレンダ処理により平滑化処理を行ってもよい。
本発明で得られる印刷用塗工紙の灰分および密度は特に限定されず、通常の印刷用塗工紙の範囲としてよい。
(評価方法)
(1)印刷面感:ローランド平判印刷機(4色)にて、平判印刷用インキ(東洋インキ製ハイユニティM)を用いて藍→紅→黄→墨の順に印刷速度8000枚/分で印刷し、得られた印刷物の特に4色および藍単色ベタ印刷部およびハーフトーン(50%)印刷部の印刷面感( 着肉ムラ、光沢度ムラなど)を目視評価した。
◎:非常に良好、○:良好、△:やや劣る、×:劣る
(2)印刷光沢度:得られた印刷物の4色ベタ印刷部の表面をJIS P 8142に基づいて測定した。
(3)デルタグロス:JIS P 8142に基づいて測定した白紙光沢度と印刷光沢度の差を測定した。
(4)操業性:塗工時の操業性、断紙、ストリーク等のトラブルの発生、生産性等を鑑みて、以下の基準で評価した。
◎:非常に良好、○:良好、△:やや劣る、×:劣る
(5)動的保水度の測定方法
装置名Kaltec Scientific社製ウォーター・リテンション・メーターを使用し、30℃ 、圧力0.5Bar、40秒間、液量20mlの条件にて、指定のフィルム(フィルター)「AA-GWR Test Filters(KALTEC SCIENCE,INC.)、GWR420」を用いて測定した。この数値が小さいほど動的保水度が高い。
顔料として、重質炭酸カルシウムスラリー(ファイマテック社製FMT-90)100部に、接着剤として、アルカリ増粘型のスチレン・ブタジエン共重合体ラテックス(ガラス転移点温度-20℃、ゲル含量85%)6部、およびヒドロキシエチル化澱粉(三和澱粉社製 エチレックス2005)4部を加えた後、さらに水を加えて固形分濃度50%のスプレー塗工液1を得た。この塗工液のB型粘度は、30mPa・sであった。
スプレー塗工液1のヒドロキシエチル化澱粉(三和澱粉社製 エチレックス2005)の添加量を6部とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、50mPa・sであった。
スプレー塗工液1のアルカリ増粘型のスチレン・ブタジエン共重合体ラテックス(ガラス転移点温度-20℃、ゲル含量85%)の添加量を4部、ヒドロキシエチル化澱粉(三和澱粉社製 エチレックス2005)8部とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、90mPa・sであった。
スプレー塗工液1の接着剤を、ヒドロキシエチル化澱粉(三和澱粉社製 エチレックス2005)16部のみとした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、300mPa・sであった。
スプレー塗工液1の固形分濃度を48%とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、8mPa・sであった。
スプレー塗工液1の固形分濃度を55%とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、80mPa・sであった。
スプレー塗工液1の固形分濃度を60%とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、300mPa・sであった。
片面当たりの塗工量が3g/m2になる様に、スプレー加圧条件を5MPa(50bar)としたこと以外は、実施例3と同様の方法で塗工紙を得た。
エアレススプレーコーターのノズル径を0.3μmとし、スプレー加圧条件を12MPa(120bar)としたこと以外は、実施例1と同様の方法で塗工紙を得た。
実施例6で調製した塗工液において、顔料として、重質炭酸カルシウムスラリー(ファイマテック社製FMT-90)75部と、微粒クレー(KAMIN社製ハイドラグロス)25部を用いたこと以外は、実施例6と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、90mPa・sであった。
スプレー塗工液1の接着剤をアルカリ増粘型のスチレン・ブタジエン共重合体ラテックス(ガラス転移点温度-20℃、ゲル含量85%)12部、ヒドロキシエチル化澱粉(三和澱粉社製 エチレックス2005)を8部とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、120mPa・sであった。
スプレー塗工液1の接着剤をアルカリ増粘型のスチレン・ブタジエン共重合体ラテックス(ガラス転移点温度-20℃、ゲル含量85%)8部のみとした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、10mPa・sであった。
スプレー塗工液1の接着剤をアルカリ増粘型のスチレン・ブタジエン共重合体ラテックス(ガラス転移点温度-20℃、ゲル含量85%)8部のみとし、固形分濃度を60%とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、60mPa・sであった。
スプレー塗工液1の固形分濃度を65%とした塗工液を調製し、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、1000mPa・sであった。
スプレー塗工液1の固形分濃度を65%とした塗工液を調製し、ブレード方式を用いて塗工したこと以外は、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、1000mPa・sであった。
スプレー塗工液1の固形分濃度を63%とした塗工液を調製し、GRC方式を用いて塗工したこと以外は、実施例1と同様の方法で印刷用塗工紙を得た。この塗工液のB型粘度は、750mPa・sであった。
Claims (8)
- 原紙の片面または両面に1以上の塗工層を有する印刷用塗工紙の製造方法であって、
顔料と、澱粉類を含む接着剤と、を含有する塗工液であって、(a)前記澱粉類を全接着剤中30~100重量%含み、かつ(b)30℃、100rpmで測定したB型粘度が300mPa・s以下であるスプレー塗工液を調製する工程、
当該塗工液をスプレー塗工して最外塗工層を形成する工程を含む、前記製造方法。 - 前記接着剤の含有量が、顔料100重量部に対し、5重量部以上20重量部未満である、請求項1に記載の製造方法。
- 前記澱粉類の含有量が、全接着剤中50~100重量%である、請求項1または2に記載の製造方法。
- 前記スプレー塗工液の固形分濃度が60重量%以下である、請求項1~3のいずれかに記載の製造方法。
- 前記最外塗工層の塗工量が、片面あたり6g/m2以上である、請求項1~4のいずれかに記載の製造方法。
- 前記顔料が、重質炭酸カルシウムを全顔料中90重量%以上含む、請求項1~5のいずれかに記載の製造方法。
- 前記スプレー塗工における塗工速度が1500m/分以上である、請求項1~6のいずれかに記載の製造方法。
- 径が0.20~0.60μmのノズルを用いて、塗工液吐出時の圧力が5MPa以上の条件においてスプレー塗工を行う、請求項1~7のいずれかに記載の製造方法。
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US9321685B2 (en) | 2012-09-12 | 2016-04-26 | Yoshino Gypsum Co., Ltd. | Gypsum composition, gypsum slurry, gypsum hardened body, gypsum-based building material, gypsum board, and manufacturing method for a gypsum-based building material |
RU2631751C2 (ru) * | 2012-09-12 | 2017-09-26 | Йосино Джипсум Ко., Лтд. | Гипсовая композиция, гипсовая суспензия, гипсовое затвердевшее тело, строительный материал на гипсовой основе, гипсовая плита и способ изготовления строительного материала на гипсовой основе |
CN107500699A (zh) * | 2012-09-12 | 2017-12-22 | 吉野石膏株式会社 | 石膏硬化体及石膏系建材 |
CN107500699B (zh) * | 2012-09-12 | 2021-04-20 | 吉野石膏株式会社 | 石膏硬化体及石膏系建材 |
WO2015079835A1 (ja) * | 2013-11-28 | 2015-06-04 | 吉野石膏株式会社 | 石膏スラリー、石膏硬化体、石膏系建材、石膏ボード、石膏スラリーの製造方法、石膏硬化体の製造方法、石膏系建材の製造方法、石膏ボードの製造方法 |
US9533916B2 (en) | 2013-11-28 | 2017-01-03 | Yoshino Gypsum Co., Ltd. | Gypsum slurry, hardened gypsum, gypsum building material, gypsum board, method of producing gypsum slurry, method of producing hardened gypsum, method of producing gypsum building material, and method of producing gypsum board |
JPWO2015079835A1 (ja) * | 2013-11-28 | 2017-03-16 | 吉野石膏株式会社 | 石膏スラリー、石膏硬化体、石膏系建材、石膏ボード、石膏スラリーの製造方法、石膏硬化体の製造方法、石膏系建材の製造方法、石膏ボードの製造方法 |
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EP2554743A4 (en) | 2014-08-27 |
AU2011235701A1 (en) | 2012-10-25 |
JPWO2011122599A1 (ja) | 2013-07-08 |
US20130011553A1 (en) | 2013-01-10 |
JP5015359B2 (ja) | 2012-08-29 |
CN102812184A (zh) | 2012-12-05 |
EP2554743A1 (en) | 2013-02-06 |
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