WO2016017313A1 - 産業用インクジェット印刷機向け印刷用塗工紙および印刷物製造方法 - Google Patents
産業用インクジェット印刷機向け印刷用塗工紙および印刷物製造方法 Download PDFInfo
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- WO2016017313A1 WO2016017313A1 PCT/JP2015/067545 JP2015067545W WO2016017313A1 WO 2016017313 A1 WO2016017313 A1 WO 2016017313A1 JP 2015067545 W JP2015067545 W JP 2015067545W WO 2016017313 A1 WO2016017313 A1 WO 2016017313A1
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- industrial inkjet
- calcium carbonate
- coated paper
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Classifications
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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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
- B41J3/546—Combination of different types, e.g. using a thermal transfer head and an inkjet print head
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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
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
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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
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/506—Intermediate layers
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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
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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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- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- 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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- 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
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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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
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to a coated paper for printing for an industrial inkjet printer, and a printed matter manufacturing method using the coated paper for printing for an industrial inkjet printer.
- Industrial inkjet printers that use an inkjet recording method are well known as industrial or commercial printers for producing a large number of commercial prints because of rapid advances in inkjet recording technology (for example, patents) References 1 and 2, Non-Patent References 1 and 2).
- Industrial inkjet printers are sold under the names such as Daipress Screen Manufacturing Corporation's TruepressJet, Miyakoshi's MJP series, Kodak's Prosper and VERSAMARK, Fuji Film's JetPress, and Hewlett-Packard's ColorInkjetWebPress. .
- Such an industrial inkjet printing machine although depending on printing conditions, has a color printing speed of 10 times to several tens of times faster than that for general household and SOHO inkjet printers and large-format inkjet printers, and a printing speed of 15 m. / Min., More than 60 m / min at higher speeds. For this reason, industrial inkjet printers are distinguished from general household and SOHO inkjet printers and large format inkjet printers.
- Industrial inkjet printers can handle variable information and can adapt to on-demand printing.
- Printers print fixed information on conventional printing machines such as gravure, offset, letterpress, flexographic, thermal transfer or toner printers, and variable information on industrial inkjet printers. In many cases, such a form is adopted.
- offset printers are often used from the viewpoint of printing image quality and manufacturing cost.
- the printing paper needs to have printability for both printing by a conventional printing machine such as an offset printing machine and printing by an industrial inkjet printing machine. Without these printing aptitudes, it is impossible to produce a printed matter having a sufficient image quality as a product by these printing machines.
- Inkjet recording medium that has good ink absorbability so that high-speed recording is possible, dots are perfectly circular, image uniformity is extremely good, and gloss and high print density can be imparted as needed.
- an inkjet recording medium having a base material and at least two coating layers containing a pigment and polyvinyl alcohol on the base material, at least one coating layer has crosslinkability with polyvinyl alcohol.
- the first coating layer containing the compound and having a peak in the pore diameter distribution curve of the first coating layer closest to the substrate among the coating layers has at least one peak of 0.1 to 10 ⁇ m, and the first coating layer
- An ink jet recording body in which the peak of the second coating layer on the layer is substantially 0.06 ⁇ m or less is disclosed (for example, see Patent Document 3).
- an ink jet recording medium excellent in fine line drawing property and glossiness it is in contact with the support, the first ink receiving layer provided on the support and containing the first inorganic fine particles, and the first ink receiving layer.
- An inkjet recording medium is disclosed in which the unevenness index of the boundary line between the first ink receiving layer and the second ink receiving layer is 1.5 to 15.0 (see, for example, Patent Document 4). ).
- JP2011-251231A Japanese Patent Laying-Open No. 2005-088525 JP 2004-167959 A JP 2011-207173 A
- Ink used in industrial inkjet printers roughly includes water-based dye ink and water-based pigment ink. From the viewpoint of the weather resistance of commercial prints, water-based pigment inks have become mainstream.
- (1) is a phenomenon in which the color density of the printed portion becomes non-uniform due to partial variations in the ink absorbency of the coated paper for printing as the printing speed increases. This is considered to be due to the fact that the ink easily moves before being absorbed in high-speed printing.
- the ink used in industrial ink jet printers has a lower concentration of coloring material than the ink of conventional printers such as offset printers. This is considered to be one of the factors.
- (3) is a phenomenon where the printed portion of the printed matter is inferior in gloss to the blank paper portion. This is considered to be caused by the fact that the color material of the ink used in the industrial inkjet printer is not uniformly fixed.
- the ink jet recording material described in Patent Document 3 is an industrial ink jet printing because it evaluates ink absorbency and gloss using an A4 size ink jet printer using dye ink called PM-950C manufactured by Seiko Epson Corporation. There has not been enough consideration for the printing speed range of the machine. Moreover, although the inkjet recording material has good glossiness at the printed portion in the inkjet printer, further improvements are required for the above (1) and (2) with respect to the industrial inkjet printer. Further, since the ink jet recording material uses wet silica as a pigment, it cannot be said that the printability of a conventional printing machine, such as an offset printing machine, is sufficient. Here, the printability for an offset printing machine refers to the absence of printing defects such as blanket piling.
- the inkjet recording medium described in Patent Document 4 is also evaluated for fine line drawing properties and glossiness using a home-use A4 size inkjet printer (Seiko Epson, EP-801A) that uses dye ink. Therefore, sufficient investigation has not been made for the printing speed region of industrial inkjet printers.
- the object of the present invention is achieved by the following. (1) including a base paper and at least two coating layers on at least one surface of the base paper; Of the at least two coating layers, the first coating layer at the most distant position with respect to the base paper is mainly composed of a pigment and a binder, Of the at least two coating layers, the second coating layer in contact with the first coating layer is mainly composed of a pigment and a binder, A peak in the pore diameter distribution curve obtained by measuring the surface of the first coating layer exists in a range of 0.010 ⁇ m or more and 0.030 ⁇ m or less, The peak in the pore diameter distribution curve obtained by measuring the surface of the second coating layer exists in the range of 0.080 ⁇ m or more and 0.300 ⁇ m or less, At least one of the pigments contained in the first coating layer is heavy calcium carbonate, and the content thereof is 60 parts by mass or more with respect to 100 parts by mass of the total pigment in the first coating layer. , Industrial inkjet, wherein at least one of the heavy calcium carbonates contained
- At least one of the pigments in the second coating layer is light calcium carbonate having an average primary particle diameter of 0.05 ⁇ m or more and 0.30 ⁇ m or less, Content of the light calcium carbonate which is the said average primary particle diameter 0.05micrometer or more and 0.30micrometer or less in the said 2nd coating layer is 60 mass parts with respect to 100 mass parts of total pigments in a 2nd coating layer. That's it, The coated paper for printing for industrial inkjet printers according to (1) above.
- a printed matter manufacturing method comprising: printing on the printing coated paper with an industrial inkjet printer to obtain a printed matter.
- a printing machine selected from a gravure printing machine, offset printing machine, letterpress printing machine, flexographic printing machine, thermal transfer printing machine or toner printing machine
- the present invention when printing is performed with an industrial inkjet printer that uses a water-based pigment ink and has printability to a conventional printer such as an offset printer, color density uniformity and abrasion resistance are maintained. It is possible to provide a coated paper for printing for an industrial inkjet printing machine that is excellent in properties and gloss. In addition, according to the present invention, it is possible to provide a printed matter production method using an industrial inkjet printer, which can produce a printed matter having excellent color density uniformity, scratch resistance and glossiness in a printed portion.
- Industrial inkjet printers are classified into continuous paper type and cut paper type depending on the paper conveyance.
- Ink types to be mounted include an aqueous dye ink whose color material is a dye and an aqueous pigment ink whose color material is a pigment.
- any method may be used for paper conveyance in an industrial inkjet printer.
- Ink jet printers for industrial use may be of any type, but water-based pigment inks are preferred from the viewpoint of the weather resistance of commercial printed matter.
- the printing speed of the industrial inkjet printer is preferably 60 m / min or more.
- Industrial inkjet printing is possible even at a printing speed lower than this, but productivity is emphasized from the viewpoint of industrial use, and a productivity of 60 m / min or more is desired.
- the printing speed is calculated from the paper size to be printed per minute.
- variable information and fixed information exist in the image to be printed, a part or all of the fixed information can be transferred from conventional methods such as gravure printers, offset printers, letterpress printers, flexographic printers, thermal transfer printers or toner printers. It is preferable to print using a printing machine. In particular, an offset printing machine is preferable in terms of manufacturing cost and printing quality. Conventional printing on a printing press may be before or after printing using an industrial inkjet printing press.
- a conventional printing machine is, for example, a gravure printing machine, an offset printing machine, a letterpress printing machine, a flexographic printing machine, a thermal transfer printing machine, or a toner printing machine.
- the gravure printing machine is an intaglio printing type printing machine that transfers ink to a printing medium through a roll-shaped plate cylinder in which an image is engraved.
- the offset printing machine is an indirect printing type printing machine in which ink is once transferred to a blanket and then transferred again to a printing medium.
- the letterpress printing machine is a letterpress type printing machine that prints by applying pressure so that the ink applied to the letterpress is pressed against the printing medium.
- the flexographic printing machine is a relief printing system that uses a flexible and elastic resin plate.
- the thermal transfer printer is a printer that uses ink ribbons of various colors, and is a printer that transfers a color material from an ink ribbon to a printing medium by heat.
- the toner printer is an electrophotographic printer that transfers toner adhering to a charging drum to a printing medium using static electricity.
- the printing coated paper for an industrial inkjet printer includes a base paper and at least two coating layers on at least one surface of the base paper.
- the coating layer located farthest from the base paper is referred to as the first coating layer
- the coating layer in contact with the first coating layer is the second coating layer. It is called construction layer.
- These 1st coating layers and 2nd coating layers have a pigment and a binder as a main component.
- the second coating layer can improve the ink absorption speed and the ink absorption capacity, and the first coating layer can improve the gloss and surface quality.
- the at least two coating layers are suitable for printing coated paper for glossy industrial inkjet printing machines.
- the number of coating layers is not limited as long as it is at least two layers.
- the coating layer is preferably two layers from the viewpoint of production cost and production stability.
- a further coating layer (referred to as “the third and subsequent coating layers” for convenience) can be provided between the base paper and the second coating layer.
- the third and subsequent coating layers are not particularly limited, such as a coating layer mainly composed of a pigment and a binder, or a coating layer mainly composed of a resin component.
- a protective layer can be provided on the first coating layer for the purpose of improving scratch resistance within a range that does not impair the effects of the present invention.
- “mainly composed of pigment and binder” means that the ratio of the pigment and binder in each coating layer is the highest with respect to the dry solid content forming each coating layer.
- At least one of the pigments contained in the first coating layer is heavy calcium carbonate, and the content thereof is 60 parts by mass with respect to 100 parts by mass of the total pigment in the first coating layer. That's it.
- at least one of the heavy calcium carbonates contained in the first coating layer is heavy calcium carbonate having an average primary particle diameter of 0.10 ⁇ m or more and 0.28 ⁇ m or less.
- the content of heavy calcium carbonate having an average primary particle size of 0.10 ⁇ m or more and 0.28 ⁇ m or less in the first coating layer is 60 parts by mass or more with respect to 100 parts by mass of the total pigment in the first coating layer. It is preferable that
- the first coating layer can contain a conventionally known pigment in addition to heavy calcium carbonate.
- Conventionally known pigments include, for example, various kaolins, clays, talc, light calcium carbonate, satin white, lithopone, titanium oxide, zinc oxide, vapor phase silica, synthetic amorphous silica, colloidal silica, alumina, and alumina hydrate. Products, aluminum hydroxide, plastic pigments and the like.
- the heavy calcium carbonate having the average primary particle diameter according to the present invention can be produced by, for example, the following method. First, a powder obtained by dry pulverizing natural limestone is dispersed in an aqueous medium to prepare a heavy calcium carbonate pre-dispersed slurry. The heavy calcium carbonate pre-dispersed slurry thus prepared is further wet pulverized using a bead mill or the like to obtain heavy calcium carbonate having an average primary particle size of 0.10 ⁇ m to 0.28 ⁇ m. Can do.
- the method of obtaining the heavy calcium carbonate which has the average primary particle diameter concerning this invention is not limited to the said method.
- natural limestone can be immediately wet pulverized, but as described above, dry pulverization is preferably performed in advance of wet pulverization.
- the particle diameter of limestone is preferably 40 mm or less, and preferably the average particle diameter is 2 ⁇ m or more and 2 mm or less.
- an organic dispersant it is preferable to apply an organic dispersant to the surface of the pulverized limestone.
- a method of adding an organic dispersant to the heavy calcium carbonate predispersed slurry prepared as described above and performing wet pulverization is preferable.
- the aqueous medium is added to limestone so that the mass ratio of limestone / aqueous medium (preferably water) is in the range of 30/70 to 85/15, preferably 60/40 to 80/20.
- a heavy calcium carbonate pre-dispersed slurry is prepared, and an organic dispersant is added thereto.
- a heavy calcium carbonate pre-dispersed slurry may be prepared by dissolving an organic dispersant in an aqueous medium in advance and dispersing limestone therein.
- the organic dispersant include a low-molecular or high-molecular water-soluble anionic surfactant having a carboxylate, sulfate ester, sulfonate, or phosphate ester salt as a functional group, or a polyethylene glycol type or polyvalent An alcohol type nonionic surfactant can be mentioned.
- a polyacrylate organic dispersant having polyacrylic acid is particularly preferable.
- organic dispersants are commercially available from San Nopco, Toagosei, Kao, etc., and can be used in the present invention.
- the amount of the organic dispersant to be used is not particularly limited, but is preferably in the range of 0.3 to 3.5 parts by mass as a solid content per 100 parts by mass of heavy calcium carbonate, and 0.5 to 3 parts by mass. The following is more preferable.
- the heavy calcium carbonate pre-dispersed slurry is wet-ground by a conventionally known method.
- the wet pulverization may be a batch type or a continuous type, and an apparatus such as a mill using a pulverization medium such as a bead mill, a sand mill, an attritor, or a ball mill is preferable.
- a pulverization medium such as a bead mill, a sand mill, an attritor, or a ball mill.
- the method for obtaining heavy calcium carbonate having an average primary particle size according to the present invention is not limited to the above method.
- the first coating layer of the printing coated paper for an industrial inkjet printer contains a binder.
- the binder include conventionally known water-soluble binders or water-dispersible binders, such as polyacrylic acid-based poly (vinyl acrylate), poly (vinyl acetate) -based, styrene-butadiene copolymer, ethylene-acetic acid.
- examples thereof include various copolymer latexes such as vinyl, polyvinyl alcohol, modified polyvinyl alcohol, formalin resins such as polyethylene oxide, urea, and melamine, and water-soluble compounds such as polyethyleneimine, polyamide polyamine, and epichlorohydrin.
- binder starch purified from natural plants, hydroxyethylated starch, oxidized starch, etherified starch, phosphate esterified starch, enzyme-modified starch, cold water soluble starch obtained by flash drying them, dextrin, mannan And natural polysaccharides such as chitosan, arabinogalactan, glycogen, inulin, pectin, hyaluronic acid, carboxymethylcellulose and hydroxyethylcellulose, or oligomers thereof, and modified products thereof.
- the binder include natural proteins such as casein, gelatin, soybean protein and collagen, or modified products thereof, synthetic polymers such as polylactic acid and peptides, and oligomers thereof. These can be used alone or in combination.
- the binder can be used after cation modification.
- the content of the binder in the first coating layer is 3 with respect to 100 parts by mass of the total pigment in the first coating layer from the viewpoint of the ink absorption capacity and the ink absorption speed with respect to an industrial inkjet printer.
- the first coating layer of the printing paper for industrial inkjet printing machines may contain a pigment dispersant, a dye fixing agent, a thermoplastic resin, a surfactant, Commonly used in the papermaking field, such as foaming agents, thickeners, wetting agents, printability improvers, tint modifiers, fluorescent brighteners, antioxidants, UV absorbers, water resistance agents, and ink fixing agents Various conventionally known additives can be contained.
- the method for providing the first coating layer of the printing paper for industrial inkjet printing machines is, for example, using the first coating layer coating solution on the second coating layer with a conventionally known coating device.
- the method of forming by coating and drying can be mentioned.
- the coating apparatus include various blade coaters such as an air knife coater and a rod blade coater, a film transfer coater, a roll coater, a bar coater, a curtain coater, and a short dwell coater, but are not particularly limited.
- a drying method a commonly used drying apparatus can be used and is not particularly limited. Examples thereof include various drying devices such as a straight tunnel dryer, an arch dryer, an air loop dryer, a hot air dryer such as a sine curve air float dryer, a dryer using an infrared heating dryer, a microwave, and the like.
- the coating amount of the first coating layer is about 1 side from the viewpoint of the compatibility between printing suitability for conventional printing machines such as offset printing machines and ink absorption capacity and ink absorption speed for industrial inkjet printing machines.
- the range of 4.0 g / m 2 or more and 15.0 g / m 2 or less is preferable.
- a coating amount refers to the coating amount of the dry solid content per one side.
- the surface of the first coating layer can be smoothed by calendering using a machine calender, soft nip calender, super calender, multi-stage calender, multi-nip calender, or the like, if necessary.
- the 1st coating layer does not need to perform a calendar process.
- At least one of the pigments of the second coating layer is light calcium carbonate having an average primary particle size of 0.05 ⁇ m or more and 0.30 ⁇ m or less.
- the content of light calcium carbonate having an average primary particle diameter of 0.05 ⁇ m or more and 0.30 ⁇ m or less in the second coating layer is 60 parts by mass with respect to 100 parts by mass of the total pigment in the second coating layer. More preferably, it is the above.
- the industrial coated ink jet printer using an aqueous pigment ink is used as the coated coated paper for the industrial ink jet printer. When printing with, it is possible to obtain better color density uniformity and better glossiness in the printed portion.
- Examples of the method for producing light calcium carbonate include, but are not limited to, the following methods.
- One method is a carbon dioxide compounding method in which quick lime obtained by firing limestone is dissolved in water to form lime milk, and light calcium carbonate is produced by reacting lime milk with carbon dioxide.
- One method is a soluble salt reaction method in which lime milk is reacted with a calcium chloride solution and sodium carbonate to produce light calcium carbonate.
- the crystal system calcite system, aragonite system, etc.
- size, and shape of light calcium carbonate can be adjusted.
- the calcite crystal is usually in the shape of canine, spindle, or chestnut or cubic (cubic or dumpling) in which they are aggregated and bonded.
- the aragonite crystal is usually in the shape of a rod or needle column.
- the shape of the light calcium carbonate in the second coating layer is preferably cubic from the viewpoint of easily satisfying the peak in the pore diameter distribution curve described later.
- the aqueous pigment ink is used because the light calcium carbonate having an average primary particle diameter of 0.05 ⁇ m or more and 0.30 ⁇ m or less in the second coating layer is cubic. When printing with an industrial inkjet printer, the uniformity of color density in the printed portion is improved.
- the second coating layer can contain a conventionally known pigment in addition to the light calcium carbonate.
- Conventionally known pigments include, for example, various kaolins, clays, talc, heavy calcium carbonate, light calcium carbonate (excluding light calcium carbonate having an average primary particle size of 0.05 ⁇ m to 0.30 ⁇ m), satin white, and lithopone. , Titanium oxide, zinc oxide, gas phase method silica, synthetic amorphous silica, colloidal silica, alumina, alumina hydrate, aluminum hydroxide, plastic pigment, and the like.
- the second coating layer of the printing coated paper for an industrial inkjet printing machine contains a binder.
- a binder is a conventionally well-known binder, Comprising: The thing similar to the binder of a 1st coating layer can be mentioned, It can use individually or in combination.
- the content of the binder in the second coating layer is 5 with respect to 100 parts by mass of the total pigment in the second coating layer from the viewpoint of the ink absorption capacity and the ink absorption speed for an industrial inkjet printer.
- the range of not less than 30 parts by mass is preferred.
- the second coating layer of the printing paper for industrial inkjet printers may contain a pigment dispersant, a dye fixing agent, a thermoplastic resin, a surfactant, Conventionally used in the papermaking field, such as foaming agents, thickeners, wetting agents, printability improvers, tint modifiers, fluorescent brighteners, antioxidants, UV absorbers, water-resistant agents, and ink fixing agents Various known additives can be contained.
- the method of providing the second coating layer of the printing paper for industrial inkjet printing machines is, for example, using a conventionally known coating apparatus to apply the second coating layer coating liquid to a base paper (or third paper).
- a conventionally known coating apparatus to apply the second coating layer coating liquid to a base paper (or third paper).
- the coating apparatus include various coating apparatuses such as a roll coater, an air knife coater, a bar coater, and a rod blade coater, a short dwell coater, and a curtain coater, but are not particularly limited.
- a drying method a commonly used drying apparatus can be used and is not particularly limited. Examples thereof include various drying devices such as a straight tunnel dryer, an arch dryer, an air loop dryer, a hot air dryer such as a sine curve air float dryer, a dryer using an infrared heating dryer, a microwave, and the like.
- the coating amount of the second coating layer is 5.0 g / m 2 or more per side from the viewpoint of printing suitability for conventional printing machines such as offset printing machines and ink absorption capacity for industrial inkjet printing machines.
- a range of 20.0 g / m 2 or less is preferred.
- the surface of the second coating layer can be smoothed by calendering using a machine calender, soft nip calender, super calender, multi-stage calender, multi-nip calender or the like, if necessary.
- the 2nd coating layer does not need to perform a calendar process.
- the average primary particle diameter of heavy calcium carbonate or light calcium carbonate is the average particle diameter of single particles.
- the average primary particle size of heavy calcium carbonate, light calcium carbonate, or other pigments is determined using each scanning electron microscope with an elemental analysis function such as an energy dispersive X-ray spectrometer.
- the particle diameter is measured by considering 100 particles existing within a certain area of the photographed image as a sphere having a diameter approximating the photographing area, and can be calculated from these particle diameters.
- the coated paper for printing for industrial ink jet printers has a pore diameter distribution curve peak of 0.010 ⁇ m or more and 0.0.mu.m or more in the pore diameter distribution curve obtained by measuring the surface of the first coating layer. It exists in the range of 030 ⁇ m or less. Further, in the pore diameter distribution curve obtained by measuring the surface of the second coating layer, the peak of the pore diameter distribution curve exists in the range of 0.080 ⁇ m to 0.300 ⁇ m.
- the measurement of the surface of the second coating layer is performed by removing the first coating layer of the printing coated paper and exposing the surface of the second coating layer.
- the first coating layer is sliced and removed or the first coating layer is shaved and removed. In this method, the second coating layer is exposed.
- the coated paper for industrial inkjet printers has excellent color density uniformity in the printed part when printed with an industrial inkjet printer using aqueous pigment ink and An excellent gloss cannot be obtained.
- the peak refers to a peak having a maximum point.
- the first coating layer contains heavy calcium carbonate in an amount of 60 parts by mass or more based on 100 parts by mass of the total pigment in the first coating layer. At least one kind is heavy calcium carbonate having an average primary particle diameter of 0.10 ⁇ m or more and 0.28 ⁇ m or less, and the peak of the pore diameter distribution curve obtained by measuring the surface of the first coating layer is 0.010 ⁇ m.
- the printing coated paper for industrial inkjet printers has printability for conventional printers such as offset printers, and was printed with industrial inkjet printers using aqueous pigment ink , Can be obtained uniformity of excellent color density in the printing section, excellent scratch resistance and excellent gloss.
- the pore diameter distribution curve can be determined by the following method from the state of the coated paper.
- the method include a method of measuring and calculating by a mercury intrusion method using a Micromeritex pore sizer 9320 (manufactured by Shimadzu Corporation).
- the mercury intrusion method calculation is performed using the following formula derived assuming that the cross section of the pore is circular.
- R -2 ⁇ COS ⁇ / P
- ⁇ surface tension of mercury
- ⁇ contact angle
- P pressure
- the surface tension of mercury is 482.536 dyn / cm
- the working contact angle is 130 °
- the low pressure part of mercury pressure (0 psia to 30 psia, the measurement pore radius: 180 ⁇ m to 3 ⁇ m)
- the high pressure part (30 psia to 30000 psia, measurement pore radius: 3 ⁇ m to 0.003 ⁇ m).
- the pore diameter distribution curve is converted according to the above equation by gradually changing the pressure applied to mercury using the above principle and measuring the volume of mercury entering the pores, that is, the pore volume V.
- the relationship between the pore diameter (2R) and the pore volume is drawn to obtain a relational curve, the differential coefficient dV / d (2R) of this relational curve is obtained as the vertical axis, and the pore diameter 2R is taken as the horizontal axis. It can be obtained.
- a peak can be obtained from the obtained pore diameter distribution curve. Usually, 1 or more and several or less peaks are recognized in the pore diameter distribution curve of the coating layer.
- the peak of the pore diameter distribution curve varies the pigment type / shape / particle diameter of the coating layer, the coating amount of the coating layer, the concentration of the coating layer coating liquid, or the drying speed during coating. Can be adjusted by.
- Preferred conditions for satisfying the peak in the pore diameter distribution curve according to the present invention are:
- the pigment in the second coating layer is cubic, and the average primary particle size is 0.05 ⁇ m or more and 0.30 ⁇ m or less
- the pigment in the first coating layer has an average primary particle size of 0.10 ⁇ m or more and 0.28 ⁇ m or less
- the coating amount of the second coating layer is 5.0 g / m 2 or more and 20.0 g / m 2 or less (per one surface), and the coating amount of the first coating layer is 4.0 g / m 2 or more and 15. It is 0 g / m 2 or less (per one side), and the dry solid content concentration of the second coating layer coating solution and the first coating layer coating solution is 35% by mass or more.
- the coated paper for printing for industrial ink jet printers has a glossiness of 75 degrees defined by JIS Z 8741 of 60% or more from the viewpoint of obtaining a high-quality feeling.
- the gloss of the coated paper for printing for industrial inkjet printers can be controlled by the type, average primary particle size, and content of the pigment in the coating layer.
- the gloss can be suppressed by adding a conventionally known matting agent to the coating layer.
- the gloss can be improved by a calendar process using a machine calendar, a soft nip calendar, a super calendar, a multistage calendar, a multinip calendar, and the like.
- a moderate calendar process is preferable.
- the base paper is a chemical pulp such as LBKP (Leaf Bleached Kraft Pulp), NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure Groundwood Pulp), RMP (Refiner Mechanical Pulp) Mechanical pulp such as Thermo Mechanical Pulp), CTMP (Chemi Thermo Mechanical Pulp), CMP (Chemi Mechanical Pulp), CGP (Chemi Groundwood Pulp), and other wood pulp such as DIP (De-Inked Pulp)
- the main component is a filler, a binder, a sizing agent, a fixing agent, a yield improver, a cationizing agent, and a paper strength enhancer.
- Base paper manufactured by various machines such as paper machines and twin wire paper machines, or sizing with starch, polyvinyl alcohol, etc. These include high-quality paper with a loess or anchor coat layer.
- the surface of the base paper or the high-quality paper can be smoothed by a machine calendar, a soft nip calendar, a super calendar, a multi-stage calendar, a multi-nip calendar, etc., if necessary.
- the base paper may be a resin-coated paper.
- the printing coated paper for an industrial inkjet printer has the coating layers according to the present invention on both sides of the base paper.
- the coating layer By providing the coating layer on both sides, it is possible to obtain the same image quality on both sides as A2 coated paper (CWF paper).
- the printed matter manufacturing method of the present invention includes a step of obtaining the above-described coated paper for printing, and a step of obtaining a printed matter by printing on the coated paper for printing with an industrial inkjet printer. According to the method for producing a printed matter of the present invention, a printed matter having excellent color density uniformity, scratch resistance and glossiness in a printed portion can be produced.
- the coated paper for printing and the industrial inkjet printer are the same as the above-described coated paper for printing for industrial inkjet printers and the industrial inkjet printer, and redundant description is omitted.
- the step of obtaining the above-mentioned printing coated paper includes producing the printing coated paper or obtaining the produced printing coated paper.
- the industrial inkjet printer preferably uses an aqueous pigment ink from the viewpoint of the weather resistance of the obtained printed matter.
- the printing speed is preferably 60 m / min or more.
- a gravure printing machine, an offset printing machine, a letterpress printing machine, a flexographic printing machine, a thermal transfer printing machine, or a toner printing machine is selected before and / or after the step of printing with an industrial inkjet printing machine.
- the printing machine may further include a step of printing on the printing coated paper.
- an offset printing press is preferable in terms of manufacturing cost and print quality.
- the present invention will be described more specifically with reference to examples.
- the present invention is not limited to the following examples as long as the gist thereof is not exceeded.
- the mass part, the mass%, and the volume% shown in the examples indicate values of dry solids or substantial components.
- Heavy calcium carbonate is obtained by roughly crushing natural limestone to an average particle size of about 30 ⁇ m with a jaw crusher, hammer crusher, and roller mill, adding water and a commercially available polyacrylate dispersant to this, and stirring. A pre-dispersed slurry having a solid content of about 75% by mass was obtained. This pre-dispersed slurry was processed using a wet pulverizer manufactured by Ashizawa Finetech Co., Ltd. (horizontal and cylindrical pulverization chamber dimensions: diameter of about 0.5 m, length of about 1.3 m).
- the beads are made of zirconia having a diameter of about 0.2 mm, the filling rate is changed in the range of 80% to 85% by volume, the flow rate is about 15 liters / minute, the number of passes is changed, and various average primary particle sizes are obtained.
- the following heavy calcium carbonates A to F were prepared. Table 1 shows the average primary particle sizes of heavy calcium carbonates A to F.
- Light calcium carbonate As the light calcium carbonate, a commercial product was obtained and used as described later.
- ⁇ Preparation of base paper> In a pulp slurry consisting of 100 parts by mass of LBKP having a freeness of 400 mlcsf, 15 parts by mass of light calcium carbonate as a filler, 0.8 parts by mass of amphoteric starch, 0.8 parts by mass of aluminum sulfate, an alkyl ketene dimer type sizing agent (size pine K903, Made by Arakawa Chemical Co., Ltd.) 0.05 parts by weight, made with a long paper machine, adhered with 2.5 g / m 2 of oxidized starch on both sides with a size press, machine calendered, Paper was made.
- the 2nd coating layer coating liquid was prepared by the following content. Pigment type, average primary particle size, and number of blended parts are listed in Table 1. Styrene-butadiene copolymer latex (JSR-2605G, manufactured by JSR) 10 parts by weight Phosphate esterified starch (MS # 4600, manufactured by Nippon Shokuhin Kako Co., Ltd.) ) 5 parts by mass Blended as described above, mixed and dispersed with water, and adjusted to a concentration of 25% by mass to 50% by mass.
- JSR-2605G manufactured by JSR
- Phosphate esterified starch MS # 4600, manufactured by Nippon Shokuhin Kako Co., Ltd.
- the first coating layer coating solution was prepared according to the following contents. Pigment type, average primary particle diameter and number of blended parts are listed in Table 1. Styrene-butadiene copolymer latex (JSR-2605G, manufactured by JSR) 8 parts by weight Phosphate-esterified starch (MS # 4600, manufactured by Nippon Shokuhin Kako Co., Ltd.) ) 5 parts by mass Blended as described above, mixed and dispersed with water, and adjusted to a concentration of 25 mass% to 45 mass%.
- JSR-2605G manufactured by JSR
- Phosphate-esterified starch MS # 4600, manufactured by Nippon Shokuhin Kako Co., Ltd.
- the pigments abbreviated in Table 1 except for heavy calcium carbonates A to F are as follows.
- Kaolin A average primary particle size 0.19 ⁇ m
- HG90 manufactured by Huber Kaolin B average primary particle size 1.10 ⁇ m
- Kao Fine 90 manufactured by Shiraishi Calcium Light calcium carbonate A average primary particle size 0.15 ⁇ m, cubic, Brilliant-15 manufactured by Shiraishi Calcium Light calcium carbonate
- B average primary particle size 0.05 ⁇ m, cubic, white gloss flower DD made by Shiroishi Calcium Light calcium carbonate
- C average primary particle size 0.30 ⁇ m, needle-pillar shape, Callite KT manufactured by Shiraishi Calcium Co.
- Light calcium carbonate D average primary particle size 0.03 ⁇ m, cubic, white gloss flower O manufactured by Shiraishi Calcium
- Light calcium carbonate E average primary particle size 0.33 ⁇ m, spindle shape, Tamapearl TP-221HDP manufactured by Okutama Kogyo Co., Ltd.
- Light calcium carbonate F average primary particle size 0.02 ⁇ m, cubic, Miclone 200 manufactured by New Lime Heavy calcium carbonate
- G average primary particle size 0.87 ⁇ m
- Hyogo Clay WH-97 Colloidal silica Average primary particle size 0.20 ⁇ m, Snowtex MP2040 manufactured by Nissan Chemical Industries
- coated paper for printing of each example and each comparative example was prepared according to the following procedure.
- the 2nd coating layer coating liquid was apply
- the drying rate was changed to adjust the peak of the pore diameter distribution curve.
- the first coating layer coating solution was applied to both sides using an air knife coater so that the amount was 8 g / m 2 per side and dried.
- the drying rate was changed to adjust the peak of the pore diameter distribution curve.
- calendering was performed to prepare coated coated papers for Examples 1 to 18 and Comparative Examples 1 to 10.
- the calendering was performed using a device composed of an elastic roll and a metal roll, and the nip linear pressure was set at a linear pressure of 120 kN / m in a range where a thickness profile in the width direction was appropriately obtained.
- the temperature of the metal roll was 50 ° C.
- An evaluation image was printed using an industrial inkjet printer ColorInkjetWebPress T-300 manufactured by Hewlett-Packard Co., Ltd. at a printing speed of 75 m / min, ink used: aqueous pigment ink, and 6000 m.
- the evaluation image is a solid pattern of 7 colors in total of 3 colors x 3 cm square with a total of 7 colors (red, green, blue) in black, cyan, magenta, yellow, and other 3 colors ink except black. Images were arranged in a line without any gaps. The uniformity of the color density in the printed portion was evaluated by visually observing each color solid image printed portion and following criteria.
- the coated paper for industrial inkjet printing machine has excellent color density uniformity in the printed portion printed by the industrial inkjet printing machine using the aqueous pigment ink.
- the color density is uniform.
- 4 The density is slightly non-uniform depending on the color. 3: Although the color density is slightly non-uniform, there is no practical problem. 2: The color density is partially uneven. 1: The color density is non-uniform throughout the printed portion.
- the scratch resistance in the printed portion was evaluated by visually observing the degree of ink detachment for each of the black, cyan, magenta, and yellow solid image.
- the coated paper for industrial ink jet printers is excellent in scratch resistance in the printed portion printed by the industrial ink jet printer using the aqueous pigment ink.
- Average glossiness difference value is 10 or more 3: Glossiness difference average value is 0 or more and less than 10 2: Glossiness difference average value is ⁇ 10 or more and less than 0 1: Glossiness difference average value is less than ⁇ 10
- Table 1 shows the evaluation results of each example and each comparative example.
- Examples 1 to 18 which are printing coated papers for industrial inkjet printers according to the present invention have printability for conventional printers such as offset printers, and use aqueous pigment inks. It is understood that the color density uniformity, scratch resistance and glossiness of the printed part are excellent in an industrial inkjet printer. On the other hand, it can be seen that Comparative Examples 1 to 10 which do not correspond to the coated paper for printing for industrial inkjet printers of the present invention cannot obtain these effects. Further, from the comparison of Examples 4, 5, 17 and 18 with Examples 1 to 3, 9 to 11, 15 and 16, at least one pigment in the second coating layer has an average primary particle size of 0.
- the content of light calcium carbonate in the second coating layer is 60 parts by mass or more with respect to 100 parts by mass of the total pigment in the second coating layer. , It turns out to be better. Further, from the comparison with Examples 1 to 3, it is found that the shape of light calcium carbonate having an average primary particle diameter of 0.05 ⁇ m or more and 0.30 ⁇ m or less in the second coating layer is preferably cubic.
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Abstract
Description
(1)印刷部分において色濃度の均一性が不十分
(2)印刷部分において耐擦過性が不十分
(3)印刷部分において光沢感が低下
ポスター、小冊子、カタログ、POP、DMおよびフライヤーなどの商品として商業印刷物を使用する場合、(1)~(3)を改善した印刷用塗工紙が望まれている。
(1)基紙と、前記基紙の少なくとも一方の面上の少なくとも2層の塗工層とを含み、
前記少なくとも2層の塗工層のうち、前記基紙を基準として最も離れた位置にある第1塗工層が、顔料とバインダーとを主成分とし、
前記少なくとも2層の塗工層のうち、前記第1塗工層に接触する第2塗工層が、顔料とバインダーとを主成分とし、
前記第1塗工層表面を測定して得られる細孔直径分布曲線におけるピークが、0.010μm以上0.030μm以下の範囲に存在し、
前記第2塗工層表面を測定して得られる細孔直径分布曲線におけるピークが、0.080μm以上0.300μm以下の範囲に存在し、
前記第1塗工層に含まれる顔料のうち少なくとも1種が、重質炭酸カルシウムであり、その含有量は、第1塗工層中の総顔料100質量部に対して60質量部以上であり、
前記第1塗工層中に含まれる重質炭酸カルシウムのうち少なくとも1種が、平均1次粒子径0.10μm以上0.28μm以下である重質炭酸カルシウムであることを特徴とする産業用インクジェット印刷機向け印刷用塗工紙。
前記第2塗工層中の前記平均1次粒子径0.05μm以上0.30μm以下である軽質炭酸カルシウムの含有量が、第2塗工層中の総顔料100質量部に対して60質量部以上である、
上記(1)の産業用インクジェット印刷機向け印刷用塗工紙。
産業用インクジェット印刷機で前記印刷用塗工紙に印刷して印刷物を得る工程とを含む、印刷物製造方法。
R=-2γCOSθ/P
ただし、式中でそれぞれR:細孔半径(2R=細孔直径)、γ:水銀の表面張力、θ:接触角、P:圧力、を示す。
試料の測定は、水銀の表面張力は482.536dyn/cmとし、使用接触角は130°とし、水銀圧力の低圧部(0psia~30psia、測定細孔半径:180μm~3μm)と高圧部(30psia~30000psia、測定細孔半径:3μm~0.003μm)にて行う。細孔直径分布曲線は、上記の原理を利用して、水銀に加える圧力を徐々に変化させ、その時に細孔内に進入した水銀の体積すなわち細孔容量Vを測定し、上記式に従って換算された細孔直径(2R)と細孔容積との関係を描き関係曲線を得て、この関係曲線の微分係数dV/d(2R)を求めて縦軸とし、細孔直径2Rを横軸にすることで、得ることができる。得られた細孔直径分布曲線からピークを求めることができる。通常、塗工層の細孔直径分布曲線は1個以上数個以下のピークが認められる。
第2塗工層中の顔料が立方状であり、かつその平均1次粒子径が0.05μm以上0.30μm以下であり、
第1塗工層中の顔料が平均1次粒子径0.10μm以上0.28μm以下であり、
第2塗工層の塗工量が5.0g/m2以上20.0g/m2以下(片面あたり)であり、第1塗工層の塗工量が4.0g/m2以上15.0g/m2以下(片面あたり)であり、かつ
第2塗工層塗工液および第1塗工層塗工液の乾燥固形分濃度が35質量%以上というものである。
本発明の印刷物製造方法は、上記の印刷用塗工紙を得る工程と、産業用インクジェット印刷機でこの印刷用塗工紙に印刷して印刷物を得る工程とを含む。本発明の印刷物製造方法により、印刷部分において色濃度の均一性、耐擦過性および光沢感に優れる、印刷物を製造することができる。印刷用塗工紙および産業用インクジェット印刷機は、上記の産業用インクジェット印刷機向け印刷用塗工紙および産業用インクジェット印刷機と同じであり、重複する説明は記載を割愛する。
下記のようにして得られた印刷用塗工紙において、第1塗工層表面および第1塗工層を除去して露出した第2塗工層表面を、走査型電子顕微鏡(JSM-6490LA、日本電子社製)で写真を撮影した。撮影画像から、撮影された粒子を面積が近似する直径を有する球形と見なして粒子の粒子径を計算し、撮影画像内に存在する100個の粒子を測定することによって、平均1次粒子径を求めた。求められた平均1次粒子径は表1に記載する。
マイクロメリテックス ポアサイザー9320(島津製作所社製)を用いて、印刷用塗工紙の第1塗工層表面、および第1塗工層を除去して露出した第2塗工層表面を測定し、細孔直径分布曲線を得た。次いで、細孔直径分布曲線におけるピークの値を確認した。結果を表1に示す。
重質炭酸カルシウムは、天然の石灰石をジョークラッシャー、ハンマークラッシャー、ローラーミルによって平均粒子径30μm程度までに粗粉砕して、これに水と市販のポリアクリル酸塩系分散剤を加えて攪拌し、固形分約75質量%の予備分散スラリーとした。この予備分散スラリーをアシザワ・ファインテック社製湿式粉砕機(横型、円柱型粉砕室の寸法:直径約0.5m、長さ約1.3m)を用いて処理した。ビーズは直径約0.2mmのジルコニア製を、充填率80体積%~85体積%の範囲で変化させ、流量は約15リットル/分とし、パス回数を変化させて、各種平均1次粒子径となる重質炭酸カルシウムA~Fを調製した。重質炭酸カルシウムA~Fの平均1次粒子径を表1に示す。
軽質炭酸カルシウムは、後記のように市販品を入手し、用いた。
濾水度400mlcsfのLBKP100質量部からなるパルプスラリーに、填料として軽質炭酸カルシウム15質量部、両性澱粉0.8質量部、硫酸アルミニウム0.8質量部、アルキルケテンダイマー型サイズ剤(サイズパインK903、荒川化学工業社製)0.05質量部を添加して、長網抄紙機で抄造し、サイズプレス装置で両面あたり酸化澱粉を2.5g/m2付着させ、マシンカレンダー処理をして、基紙を作製した。
第2塗工層塗工液は、下記の内容により調製した。
顔料 種類、平均1次粒子径および配合部数は表1に記載
スチレン-ブタジエン共重合体ラテックス(JSR-2605G、JSR社製) 10質量部
リン酸エステル化澱粉(MS#4600、日本食品化工社製) 5質量部
上記の内容で配合し、水で混合・分散して、濃度25質量%~50質量%の間に調整した。
第1塗工層塗工液は、下記の内容により調製した。
顔料 種類、平均1次粒子径および配合部数は表1に記載
スチレン-ブタジエン共重合体ラテックス(JSR-2605G、JSR社製) 8質量部
リン酸エステル化澱粉(MS#4600、日本食品化工社製) 5質量部
上記の内容で配合し、水で混合・分散して、濃度25質量%~45質量%の間に調整した。
カオリンA:平均1次粒子径0.19μm、ヒューバー社製HG90
カオリンB:平均1次粒子径1.10μm、白石カルシウム社製カオファイン90
軽質炭酸カルシウムA:平均1次粒子径0.15μm、立方状、白石カルシウム社製Brilliant-15
軽質炭酸カルシウムB:平均1次粒子径0.05μm、立方状、白石カルシウム社製白艶華DD
軽質炭酸カルシウムC:平均1次粒子径0.30μm、針柱状、白石カルシウム社製カルライトKT
軽質炭酸カルシウムD:平均1次粒子径0.03μm、立方状、白石カルシウム社製白艶華O
軽質炭酸カルシウムE:平均1次粒子径0.33μm、紡錘状、奥多摩工業社製タマパールTP-221HDP
軽質炭酸カルシウムF:平均1次粒子径0.02μm、立方状、ニューライム社製ミクローン200
重質炭酸カルシウムG:平均1次粒子径0.87μm、兵庫クレー社製WH-97
コロイダルシリカ:平均1次粒子径0.20μm、日産化学工業社製スノーテックスMP2040
基紙上に、第2塗工層塗工液を、ブレードコーターを用いて片面あたり12g/m2となるように両面に塗工し、乾燥した。乾燥速度は、細孔直径分布曲線のピークを調整するために変更した。乾燥後に、第1塗工層塗工液を、エアナイフコーターを用いて片面あたり8g/m2となるように両面に塗工し、乾燥した。乾燥速度は、細孔直径分布曲線のピークを調整するために変更した。乾燥後に、カレンダー処理を施して、実施例1~18および比較例1~10の印刷用塗工紙を作製した。カレンダーは、弾性ロールと金属ロールからなる装置を用いて、ニップ線圧は幅方向の厚みプロファイルが適切に得られる範囲において、線圧120kN/mで行った。また金属ロールの温度を50℃とした。
オフセット印刷機としてミヤコシ社製オフセットフォーム輪転機を用いて、印刷速度:150m/分、使用インク:T&K TOKA UVベストキュア墨および金赤(bronze red)、UV照射量:8kW×2基の条件で6000m、所定の評価画像を繰り返し印刷した。印刷適性は、ブランケットパイリングの発生状態を目視にて観察し、下記の基準にて評価した。本発明において、評価2または3であれば、産業用インクジェット印刷機向け印刷用塗工紙は印刷適性を有するものとする。
3:ブランケットパイリングの発生がほとんど認められない。
2:ブランケットパイリングの発生が認められるが、実用上問題ない。
1:ブランケットパイリングの発生が認められ、実用上問題である。
Hewlett-Packard社製産業用インクジェット印刷機ColorInkjetWebPress T-300を用い、印刷速度:75m/分、使用インク:水性顔料インクの条件で6000m、評価画像を印刷した。評価画像は、ブラック、シアン、マゼンタ、イエローの各単色およびブラックを除く他の3色インクでの2重色(レッド、グリーン、ブルー)の計7色のベタパターンを、3cm×3cm四方で横一列に隙間なく配置する画像とした。印刷部分における色濃度の均一性は、各色ベタ部画像印刷部分を目視にて観察し、下記の基準にて評価した。本発明において、評価3~5であれば、産業用インクジェット印刷機向け印刷用塗工紙は水性顔料インクを使用する産業用インクジェット印刷機で印刷した印刷部分において色濃度の均一性に優れるものとする。
5:色濃度が均一である。
4:色によっては極僅かに濃度が不均一である。
3:色濃度が僅かに不均一であるものの、実用上問題ない。
2:色濃度が部分的に不均一である。
1:印刷部分の全体に、色濃度が不均一である。
Hewlett-Packard社製産業用インクジェット印刷機ColorInkjetWebPress T-300を用い、印刷速度:100m/分、使用インク:水性顔料インクの条件で6000m、評価画像を印刷した。評価画像は、ブラック、シアン、マゼンタ、イエローの各単色のベタパターンを、10cm×10cm四方で横一列に隙間なく配置する画像とした。印刷してから24時間後に、1000gまたは500gの荷重で木綿のガーゼを押し付けた状態で1回ガーゼを移動させて擦過試験を行った。印刷部分における耐擦過性は、ブラック、シアン、マゼンタ、イエローの各ベタ部画像についてインクの脱離程度を目視にて観察し、下記の基準にて評価した。本発明において、評価3~5であれば、産業用インクジェット印刷機向け印刷用塗工紙は水性顔料インクを使用する産業用インクジェット印刷機で印刷した印刷部分において耐擦過性に優れるものとする。
5:1000gの荷重のとき、脱離が認められない。
4:1000gの荷重のとき、僅かに脱離が認められる。
3:500gの荷重のとき、僅かに脱離が認められる。
2:500gの荷重のとき、多少の脱離が認められる。
1:500gの荷重のとき、著しく脱離が認められる。
Hewlett-Packard社製産業用インクジェット印刷機ColorInkjetWebPress T-300を用い、印刷速度:100m/分、使用インク:水性顔料インクの条件で6000m、評価画像を印刷した。評価画像は、ブラック、シアン、マゼンタ、イエローの各単色のベタパターンを、10cm×10cm四方で横一列に隙間なく配置する画像とした。光沢感は、各色ベタ画像印刷部分と白紙部分との光沢度差を測定することによって評価した。光沢度は、村上色彩技術研究所社製デジタル光沢計GM-26D型を用い、入反射角度が75度で、JIS Z 8741に準拠して測定した。ベタ画像印刷部分の光沢度から白紙部分の光沢度を引いた光沢度差の平均値=([ブラックΔグロス]+[シアンΔグロス]+[マゼンタΔグロス]+[イエローΔグロス])/4を求め、下記の基準に従い評価した。本発明において、評価3および4であれば、産業用インクジェット印刷機向け印刷用塗工紙は産業用インクジェット印刷機で印刷した印刷部分の光沢感に優れるものとする。
4:光沢度差平均値が10以上
3:光沢度差平均値が0以上10未満
2:光沢度差平均値が-10以上0未満
1:光沢度差平均値が-10未満
また、実施例4、5、17および18と実施例1~3、9~11、15および16との対比から、第2塗工層中の顔料の少なくとも1種が平均1次粒子径0.05μm以上0.30μm以下の軽質炭酸カルシウムであって、第2塗工層中の軽質炭酸カルシウムの含有量が第2塗工層中の総顔料100質量部に対して60質量部以上であると、より良好であると分かる。さらに、実施例1~3の対比から、第2塗工層中の平均1次粒子径0.05μm以上0.30μm以下である軽質炭酸カルシウムの形状は、立方状が好ましいと分かる。
Claims (6)
- 基紙と、前記基紙の少なくとも一方の面上の少なくとも2層の塗工層とを含み、
前記少なくとも2層の塗工層のうち、前記基紙を基準として最も離れた位置にある第1塗工層が、顔料とバインダーとを主成分とし、
前記少なくとも2層の塗工層のうち、前記第1塗工層に接触する第2塗工層が、顔料とバインダーとを主成分とし、
前記第1塗工層表面を測定して得られる細孔直径分布曲線におけるピークが、0.010μm以上0.030μm以下の範囲に存在し、
前記第2塗工層表面を測定して得られる細孔直径分布曲線におけるピークが、0.080μm以上0.300μm以下の範囲に存在し、
前記第1塗工層に含まれる顔料のうち少なくとも1種が、重質炭酸カルシウムであり、その含有量は、第1塗工層中の総顔料100質量部に対して60質量部以上であり、
前記第1塗工層中に含まれる重質炭酸カルシウムのうち少なくとも1種が、平均1次粒子径0.10μm以上0.28μm以下である重質炭酸カルシウムであることを特徴とする産業用インクジェット印刷機向け印刷用塗工紙。 - 前記第2塗工層中の顔料の少なくとも1種が、平均1次粒子径0.05μm以上0.30μm以下である軽質炭酸カルシウムであり、
前記第2塗工層中の前記平均1次粒子径0.05μm以上0.30μm以下である軽質炭酸カルシウムの含有量が、第2塗工層中の総顔料100質量部に対して60質量部以上である、
請求項1に記載の産業用インクジェット印刷機向け印刷用塗工紙。 - 前記第2塗工層中の軽質炭酸カルシウムの形状が、立方状である、請求項2に記載の産業用インクジェット印刷機向け印刷用塗工紙。
- 請求項1~3のいずれかに記載の印刷用塗工紙を得る工程と、
産業用インクジェット印刷機で前記印刷用塗工紙に印刷して印刷物を得る工程とを含む、印刷物製造方法。 - 産業用インクジェット印刷機が水性顔料インクを使用している、請求項4に記載の印刷物製造方法。
- 産業用インクジェット印刷機で印刷する工程の前および/または後に、グラビア印刷機、オフセット印刷機、活版印刷機、フレキソ印刷機、熱転写印刷機またはトナー印刷機から選択される印刷機で前記印刷用塗工紙に印刷する工程をさらに含む、請求項4又は5に記載の印刷物製造方法。
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