JP4039078B2 - Method for producing inkjet recording medium for printing proofreading - Google Patents

Description

【００４９】
表１から解るように、実施例１から４の印刷校正用インクジェット記録媒体は、何れも、インク吸収性、未記録部の風合い、オフセット印刷と比較した、記録部の色再現、及び風合いといった校正用途として必要とされる項目、全てで実用可能な範囲にあり、印刷校正用に適したインクジェット記録媒体であることが解る。
【００５０】
また、基材をパルプを主成分とする紙にすること、さらに、パルプを主成分とする紙の透気度を、１０〜３００秒／１００ｃｃにすること、さらには、パルプを主成分とする紙のステキヒトサイズ度を５０秒にすることで、より良好であることが解る。
【００５１】
一方、インク受容層表面の６０°鏡面光沢度が、４０より大きい比較例２の印刷校正用インクジェット記録媒体は、未記録部及び記録部の風合いが大きく異なり、印刷校正用として使用することは難しい。
また、インク受容層最表層に、乾式シリカではなく湿式シリカを使用した、比較例３の印刷校正用インクジェット記録媒体は、インク受容層表面の６０°鏡面光沢度が５未満であり、未記録部及び記録部の風合いが大きく異なる他に、インク吸収性に問題ないにも係わらず記録部の色再現が明らかに劣るため、印刷校正用として使用することは難しい。
さらに、市販されている比較例４の印刷校正用インクジェット記録媒体は、二次色、三次色といった部分でインク吸収性に問題があり、結果としてオフセット印刷の色再現ができないため、印刷校正用として使用することは難しい。
【００５２】
【発明の効果】
本発明の印刷校正用インクジェット記録媒体は、インク受容層が十分なインク吸収性を有し、その結果、印刷用紙へのオフセット印刷、或いはグラビア印刷といった製版方式による印刷の色再現範囲を十分カバーすることができ、しかも印刷物と同等の仕上がり感を兼ね備えている点で、非常に優れた印刷校正用インクジェット記録媒体である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording medium used for printing proofreading using an ink jet recording method and a method for manufacturing the same. More specifically, the present invention relates to an ink jet recording medium suitable for printing proofreading, in which an image obtained by an ink jet recording method has a finished state similar to an image obtained by proof printing by a plate making method on a printing paper, and a method for manufacturing the same. .
[0002]
[Prior art]
In the ink jet recording method, fine droplets are ejected from the head of an ink jet printer to form an image on paper or film. In recent years, in addition to the simplicity of the image forming mechanism, the size of the ejected droplets and the resolution of the dots have been increased, and the clarity and speed of the recorded images and characters, low noise, and dot density have been high. In addition, since the color reproduction range to be recorded is expanded, it is rapidly spreading to various applications.
[0003]
In general households, an inkjet printer is used to record postcards and images such as New Year's cards, and an image recorded by a digital camera is output by an inkjet printer.
In addition, commercial signs in the city are output from inkjet printers, and its use is expanding not only for personal use but also for business use.
[0004]
However, while the performance of these recording media is improving and spreading to various uses, an ink jet recording medium that is sufficiently satisfied as a printing proofreading application has not yet been obtained. The reason for this is that in order to use an inkjet recording medium for print calibration, not only the performance as an inkjet recording medium, such as ink absorbency, but also the desired hue, brightness, texture, gloss, etc. of the printing paper should be considered. This is because the image of the ink jet recording section must have the same texture as the printed matter.
[0005]
In order to use inkjet recording media for printing proofreading applications, it is essential to cover the color reproduction range obtained by offset printing and gravure printing. To achieve this, ink reception is usually performed so that high color development can be obtained. It is conceivable to design the material of the layer or to eject an amount of ink that can cover the desired color reproduction range from the ink jet printer.
In general, in order to cover the color reproduction range of offset printing and gravure printing, it is necessary to eject a considerably larger amount of ink than the amount of ink normally used in ordinary homes and offices. Therefore, the ink-jet recording medium is first required to absorb ink in an amount that can cover the color reproduction range of printing, but with glossy paper that is used in an output body such as the digital camera described above, At present, there is nothing that has sufficient ink absorbability, and there is nothing that satisfies only a part of the mat type.
[0006]
When ink is ejected from an ink-jet printer to an ink-jet recording medium that does not have sufficient ink absorptivity, such as conventional glossy paper, the problem of bleeding and poor drying occurs. Not only does this occur, but when two or more color droplets overlap, color unevenness called beading occurs, which cannot be used for printing proofing.
[0007]
Also, even if the amount of ink that can cover the color reproduction range of printing can be absorbed, what is obtained by inkjet recording on glossy paper is very beautiful in appearance, but it is better than offset printing or gravure printing. It is not a printed tone image, but a silver salt photographic tone image, and the surface of the glossy paper itself is very high glossy. It is impossible to use as a product.
[0008]
On the other hand, for the mat type that can absorb the amount of ink that can cover the color reproduction range of printing, there is no problem with the ink absorption itself, but the image obtained by ink jet recording has white spots and color unevenness specific to the mat type. Further, the density lowers due to the penetration of the coloring component in the ink, and it cannot be used for printing proofing.
[0009]
By the way, there are some ink jet recording media that are commercially available for printing proofreading these days, but none of them has ink absorptivity enough to cover the color reproduction range of printing. In general, a plurality of layers are laminated on a substrate, such as an ink receiving layer intended to absorb the solvent in the ink or an ink receiving layer that selectively captures the dye in the ink. It is.
For this reason, the surface roughness increases as each layer is laminated on the substrate, and the surface of the ink jet recording medium is considerably roughened. The roughness of the ink jet recording medium surface appears as waviness and glare, and this waviness and glare affects the entire texture of the recording medium. In other words, the unevenness of the surface of the inkjet recording medium is not only different in texture between these recording media and the printing paper, but the image quality obtained by inkjet recording seems to be very inferior due to this swell and glare. The texture is very different and cannot be used for print proofing.
[0010]
[Problems to be solved by the invention]
An object of the present invention is to provide an ink jet recording medium suitable for print proofing and a method for manufacturing the same, capable of faithfully reproducing a printing finish by a plate making system on a printing paper.
[0011]
[Means for Solving the Problems]
  The invention described in claim 1 is a coating liquid containing at least a binder and a pigment on a base material made of pulp whose main component is air permeability of 10 to 300 seconds / 100 cc as defined in JIS P8117. Coating and drying to form an ink-receiving layer, applying a coating liquid containing dry silica and a water-soluble resin on a transfer substrate, and a substrate on which the ink-receiving layer is formed A step of bonding a film-forming surface of the material, a coating surface of a transfer substrate coated with a coating liquid containing the dry silica and a water-soluble resin, a step of drying the bonded substrate, and the transfer substrate And a step of forming an outermost ink-receiving layer mainly comprising the dry silica and the water-soluble resin on the surface of the ink-receiving layer.For print proofingIt is a manufacturing method of an inkjet recording medium.
[0012]
  The invention according to claim 2 is characterized in that the transfer substrate is a matte film, and the surface of the manufactured inkjet recording medium is 5 to 40% in terms of 60 ° specular gloss as defined in JIS Z8741. And according to claim 1For print proofingIt is a manufacturing method of an inkjet recording medium.
[0013]
  In the invention according to claim 3, the paper having the pulp as a main component has a basis weight of 127.9 g / m.²3. The degree of succinity stipulated in JIS P8122 is 50 seconds or longer whenFor print proofingIt is a manufacturing method of an inkjet recording medium.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the inkjet recording medium for printing proofreading and the manufacturing method of the present invention will be described in detail.
[0017]
The substrate used in the present invention is not particularly limited, and plastic films such as polyethylene, polypropylene, polyester, cellophane, polyurethane, and polyvinyl chloride, and chemicals such as LBKP, LBSP, LDP, NBKP, NBSP, and NDP. Pulp, GP, PGW, RMP, TMP, CTMP, CMP, CGP, and other mechanical pulp, DIP and other waste paper pulp, and other papers such as cotton, hemp, silk or chemical fibers Further, any one of laminated materials obtained by bonding them together can be used. Among them, it is preferable to use a paper mainly composed of pulp as a base material because the texture of the printing paper can be easily obtained.
[0018]
Further, as the paper, paper having pulp as a main component is more preferably 10 to 300 seconds / 100 cc in air permeability defined by JIS P8117. The reason is that the outermost layer of the ink receiving layer is used for transfer. After coating on the base material in advance, before drying, it is superimposed on an ink receiving layer comprising at least one layer formed in advance on the base material, and then dried, and the transfer base material is peeled off. This is because when the ink-receiving layer is formed by a so-called wet transfer method, it is necessary for the vapor to pass through the base material during drying, and workability becomes easier by setting it to 300 seconds / 100 cc or less. At the same time, when the ink receiving layer is applied to the substrate, the workability is remarkably deteriorated if it is less than 10 seconds / 100 cc.
[0019]
Furthermore, the paper mainly composed of pulp has a basis weight of 127.9 g / m.²In this case, it is more preferable that the sizing degree defined by JIS P8122 is 50 seconds or more, because not only the application of the ink receiving layer to the substrate is facilitated, but also the obtained This is because, when ink jet recording is performed on an ink jet recording medium for printing calibration, it is difficult to generate waviness and unevenness caused by ink absorption of the base material itself, which is called cockling.
[0020]
The ink receiving layer other than the outermost layer is composed mainly of pigments and binders that satisfy characteristics such as high absorbency, color reproducibility, and high definition with respect to ink containing a dye component used in commercially available inkjet recording apparatuses. It can form with the composition made into.
[0021]
The pigment used in the ink receiving layer other than the outermost layer is not particularly limited, and one or more kinds of pigments that are usually used can be used. For example, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, satin white, zinc carbonate, magnesium carbonate, aluminum silicate, calcium silicate, magnesium silicate, wet silica, dry silica , Colloidal silica, colloidal alumina, pseudoboehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohalosite, magnesium hydroxide and other inorganic pigments, acrylic plastic pigment, styrene plastic pigment, microcapsule, urea resin, melamine resin And organic pigments. Among these, porous inorganic pigments are preferable, and examples thereof include porous wet silica, porous magnesium carbonate, and porous alumina. Particularly, porous wet silica having a large pore volume is preferable in terms of cost.
[0022]
The binder used for the ink receiving layer other than the outermost layer is not particularly limited, and one or more kinds of general binders can be used. For example, synthetic products include polyvinyl alcohol, silanol modified polyvinyl alcohol, partially acetalized polyvinyl alcohol, allyl modified polyvinyl alcohol, modified polyvinyl alcohol such as polyvinyl methyl ether, polyvinyl ethyl ether and polyvinyl isobutyl ether, polyacrylate, polyacrylic Acid ester partial saponification products, polyacrylic acid derivatives such as polymethacrylate and polyacrylamide and polymethacrylic acid derivatives, cellulose derivatives such as methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, polyethylene glycol, polyethylene oxide, polyvinylpyrrolidone, vinyl Pyrrolidone vinyl acetate copolymer, styrene butadiene copolymer, nito Le butadiene copolymer, styrene-acrylic acid ester copolymer, styrene-maleic acid copolymer, styrene crotonic acid copolymers, vinyl-containing chloride copolymer, polyurethane, unsaturated polyesters, and alkyd resins. Examples of natural products include proteins such as gelatin, starches such as potato, algae such as agar, plant mucilage such as mannan, and microbial mucilage such as glucan.
[0023]
The outermost ink-receptive layer is composed of dry silica and a water-soluble resin as main components, and the surface of the ink-receptive layer after formation is 5 to 40% in terms of 60 ° specular gloss specified by JIS Z8741. It is characterized by doing.
[0024]
The dry silica, which is an essential component in the outermost ink receiving layer, is a silica having a very small particle diameter that can be obtained by a combustion method or a heating method.
By using this dry silica for the outermost surface layer of the ink jet recording medium, the surface of the ink receiving layer can be smoothed, and not only the gloss adjustment is facilitated, but also sufficient voids are formed inside the outermost layer of the ink receiving layer. Therefore, high ink absorbability can be imparted.
Here, when colloidal silica having the same particle diameter is used instead of dry silica, the ink absorbability is inferior because sufficient voids are not formed as much as dry silica. Similarly, when wet silica that can be obtained by a precipitation method or gel method is used, since the wet silica itself cannot have a particle size as small as dry silica, the unevenness of the surface of the ink receiving layer is severe. Therefore, gloss adjustment cannot be performed.
[0025]
Similarly, the water-soluble resin, which is an essential component in the outermost ink-receiving layer, is particularly limited as long as it serves as a binder of dry silica and can be partially dissolved by the aqueous ink used in recording. It is not a thing but 1 or more types of normal water-soluble resin can be used. For example, synthetic products include polyvinyl alcohol, silanol modified polyvinyl alcohol, partially acetalized polyvinyl alcohol, allyl modified polyvinyl alcohol, modified polyvinyl alcohol such as polyvinyl methyl ether, polyvinyl ethyl ether and polyvinyl isobutyl ether, polyacrylate, polyacrylic Acid ester partial saponification products, polyacrylic acid derivatives such as polymethacrylate and polyacrylamide and polymethacrylic acid derivatives, cellulose derivatives such as methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, polyethylene glycol, polyethylene oxide, polyvinylpyrrolidone, polyethylene Examples include imines. Examples of natural products include proteins such as gelatin and casein, starches such as potato, algae such as agar, plant mucilage such as mannan, and microbial mucilage such as glucan.
[0026]
Further, it is important here that the surface of the ink receiving layer is 5 to 40% in terms of 60 ° specular gloss specified by JIS Z8741. If the glossiness is less than 5%, the matte property is too strong, causing roughness in the recording and non-recording areas, and the texture is greatly different from the printing finish by the plate-making method. I can't. On the other hand, when the glossiness is greater than 40%, the non-recording area itself is highly glossy, which is very different from the texture of the printing paper, and the finished feeling after recording is not a print tone but a silver salt photographic tone. Therefore, it cannot be used for printing proofing.
[0027]
The glossiness adjustment of the ink receiving layer surface can be easily adjusted by the blending ratio of dry silica and water-soluble resin, but the surface properties of the ink receiving layer other than the outermost layer cannot be ignored. So-called calendering, which performs calendar processing such as super calender, soft calender, etc., so-called cast method, ink receiving layer top layer, where the outermost surface layer of the ink receiving layer is wet and pressed with a metal drum that is optionally surface-treated. After the surface layer is preliminarily coated on the surface-treated transfer substrate, before drying, it is superimposed on the ink-receiving layer previously formed on the substrate, and after drying, the transfer substrate is peeled off. Gloss adjustment is preferably performed by any one of so-called wet transfer methods.
In particular, the wet transfer method that can easily obtain an arbitrary surface gloss only by adjusting the surface treatment of the transfer substrate is most preferable.
[0028]
In addition, as a method of coating each ink receiving layer in the present invention, air knife coater, blade coater, curtain coater, die coater, gate roll coater, bar coater, comma coater, lip coater, gravure coater, rod coater, bill coater Various apparatuses such as a blade coater, a short dwell blade coater, and a roll coater can be used.
[0029]
For the ink receiving layer, a dye fixing agent, a pigment dispersant, an antifoaming agent, a leveling agent, a thickening agent, a fluidity improving agent, a sizing agent, an ultraviolet absorber, an antioxidant, and an antifungal agent are used as necessary. In addition, additives such as a water-proofing agent, a pH adjuster, and a fluorescent brightening agent can be arbitrarily selected and contained within a range that does not interfere with the object of the present invention. In addition, a coloring dye or pigment can be added for the purpose of matching the color tone of the desired printing paper.
[0030]
The blending ratio of the filler and the resin forming the ink receiving layer is not particularly limited including the outermost layer of the ink receiving layer, but is preferably in the range of 9.5: 0.5 to 4: 6, more preferably 8.5: 1.5-6: 4. If the filler weight ratio is higher than this range, the binding force of the resin is insufficient during film formation, and cracking may occur during drying or the film may become brittle. If so, there is a possibility that the absorption speed of the ink ejected from the ink jet printer is lowered, and there is a possibility that problems such as bleeding and poor drying may occur.
[0031]
The dry coating amount of the entire ink receiving layer is 5 to 50 g / m without any problem as long as sufficient ink absorption capability can be secured.²In the case of the present invention, in order to adjust the surface glossiness of the ink receiving layer and to make the image obtained by recording the same feeling as the printing finish of the plate-making method, the ink receiving layer is most suitable. Surface layer is 3 g / m²It is preferable to provide the above.
[0032]
In addition, as the ink jet recording medium of the present invention, a back layer can be provided on the opposite side of the ink receiving layer through the base material for the purpose of preventing curling of the ink jet recording medium or stabilizing the printer runnability. It is.
[0033]
Further, in the ink jet recording medium of the present invention, in order to clarify the ink receiving layer, it is also possible to carry out back printing on the opposite side of the ink receiving layer through the substrate.
[0034]
【Example】
  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, the content of this invention is not limited to these. Further, “parts” shown in the examples indicate parts by weight unless otherwise specified.<Example 1> is a method for manufacturing an ink jet recording medium in which the outermost ink receiving layer is formed by a method other than the wet transfer method, and is a reference example. <Example 2> is a method for producing an ink jet recording medium when a paper having an air permeability specified by JIS P8117 exceeding 300 seconds / 100 cc is used as a substrate, and is a reference example.
[0035]
<Adjustment of coating liquid>
The used coating liquid A to coating liquid C are shown below.
“Coating fluid A”
Precipitation method wet silica X-37B 13 parts
(Manufactured by Tokuyama Corporation: secondary particle size 3.7 μm)
Polyvinyl alcohol R-1130 (manufactured by Kuraray Co., Ltd.) 4 parts
83 parts of water
[0036]
"Coating fluid B"
Combustion method dry silica 50 15 parts
(Nippon Aerosil Co., Ltd .: secondary particle size 0.23 μm)
Polyvinyl alcohol PVA-117 (manufactured by Kuraray Co., Ltd.) 3 parts
82 parts of water
[0037]
“Coating fluid C”
Precipitation method wet silica X-40 15 parts
(Manufactured by Tokuyama Corporation: secondary particle size 2.5 μm)
Polyvinyl alcohol PVA-117 (manufactured by Kuraray Co., Ltd.) 3 parts
82 parts of water
[0038]
<Example 1>
A synthetic paper having a thickness of 110 μm (YUPO FPG110 manufactured by Oji Oil Synthetic Paper Co., Ltd.) is used as a base material, and the coating liquid A is applied to one of them using an air knife coater, and the dry coating amount is 20 g / m.²After coating and drying, the coating liquid B is dried using a lip coater, and the dry coating amount is 10 g / m.²After coating and drying, a supercalender treatment was performed at a linear pressure of 200 kg / cm to produce an ink-jet recording medium for printing calibration having a surface glossiness of 15%.
[0039]
<Example 2>
Basis weight 127.9 g / m²Paper (Oji Paper Co., Ltd. OK Top Coat N (air permeability 1000 seconds / 100 cc, Steecht size degree 60 seconds)) as a base material, and the above coating liquid A on the air knife coater Used, dry coating amount 20g / m²After coating and drying, the above coating solution B is dried and coated on a 25 μm-thick mat film (Unit: PTH-25 manufactured by Unitika Ltd.) using a lip coater. Amount 10 g / m²And the nip pressure 3kg / cm²After bonding together and drying, the matte film was peeled off to produce an ink-jet recording medium for printing calibration having a surface glossiness of 18%.
[0040]
<Example 3>
Basis weight 127.9 g / m²Paper (made by Gojo Paper Co., Ltd. (air permeability: 15 sec / 100 cc, steecht size: 5 sec)) as a base material, and on the other hand, the above-mentioned coating liquid A is dried using an air knife coater 20g / m²After coating and drying, the above coating solution B is dried and coated on a 25 μm-thick mat film (PTH-25, manufactured by Unitika Ltd.) using a lip coater. Amount 10 g / m²And the nip pressure 3kg / cm²After being bonded together and dried, the matte film was peeled off to prepare an ink-jet recording medium for printing calibration having a surface glossiness of 20%.
[0041]
<Example 4>
Basis weight 127.9 g / m²Of paper (made by Gojo Paper Co., Ltd. (air permeability: 150 sec / 100 cc, steecht size: 200 sec)), and on the other hand, the above-mentioned coating liquid A is dried using an air knife coater. 20g / m²After coating and drying, the above coating liquid B is dried and coated on a matte film (PTH-25 manufactured by Unitika Ltd.) having a thickness of 25 μm as a transfer substrate using a lip coater. Amount 10 g / m²And the nip pressure 3kg / cm²After being bonded together and dried, the mat film was peeled off to produce an ink-jet recording medium for printing calibration having a surface glossiness of 25%.
[0042]
<Comparative Example 1>
Basis weight 127.9 g / m²Paper (Oji Paper Co., Ltd. OK Top Coat N (surface gloss 40%)) was used as an offset printing medium.
[0043]
<Comparative example 2>
Basis weight 127.9 g / m²Of paper (made by Gojo Paper Co., Ltd. (air permeability: 150 sec / 100 cc, steecht size: 200 sec)), and on the other hand, the above-mentioned coating liquid A is dried using an air knife coater. 20g / m²After coating and drying, the coating liquid B is dried on a 25 μm-thick untreated film (S-25, manufactured by Unitika Ltd.) using a lip coater. Application amount 10g / m²And the nip pressure 3kg / cm²After being bonded together and dried, the untreated film was peeled off to produce an ink-jet recording medium for printing calibration having a surface glossiness of 45%.
[0044]
<Comparative Example 3>
Basis weight 127.9 g / m²Of paper (made by Gojo Paper Co., Ltd. (air permeability: 150 sec / 100 cc, steecht size: 200 sec)), and on the other hand, the above-mentioned coating liquid A is dried using an air knife coater. 20g / m²After coating and drying, the above coating liquid C is dried and coated on a mat film (PTH-25 manufactured by Unitika Co., Ltd.) having a thickness of 25 μm as a transfer substrate using a lip coater. Amount 10 g / m²And the nip pressure 3kg / cm²After being bonded together and dried, the matte film was peeled off to prepare an ink-jet recording medium for printing calibration having a surface glossiness of 4%.
[0045]
<Comparative example 4>
Basis weight 185g / m²Inkjet recording medium for printing calibration (INK-JET PROOF Semi-Gloss thick mouth (ink receiving layer surface glossiness 21%) manufactured by Mitsubishi Paper Industries Co., Ltd.) was used as an inkjet recording medium for printing calibration.
[0046]
<Image formation>
As an evaluation image, NIA.JIS / ISO-SCID high-definition color digital standard image data. Regarding the inkjet recording medium for print proofing except for Comparative Example 1 using Tiff-300 dpi, BJ-F8500 (High Quality Mode manufactured by Canon Inc.) and Power-RIP (Manufactured by Canon Inc.) are used as the inkjet printer. Inkjet recording was performed to obtain an image.
For the offset printing medium of Comparative Example 1, the same image was color-separated into Y, M, C, and K, and offset printing consisting of 175 line Y, M, C, and K4 color printing was performed to obtain an image.
[0047]
The evaluation items as an ink jet recording medium for print calibration were ink absorptivity, texture of the unrecorded area, color reproduction and texture of the recorded area compared to offset printing. The results are shown in Table 1.
Note that each evaluation item was determined in three stages, ◯, Δ, and ×, but Δ or more is a practical range for print proofing.
[0048]
[Table 1]

[0049]
As can be seen from Table 1, the ink-jet recording media for printing calibration of Examples 1 to 4 are all calibrated such as ink absorbency, texture of unrecorded area, color reproduction of recorded area, and texture compared to offset printing. It can be understood that the ink jet recording medium is suitable for printing proofreading because it is in a practical range in all items required for use.
[0050]
Further, the base material is made of paper containing pulp as a main component, the air permeability of the paper containing pulp as a main component is set to 10 to 300 seconds / 100 cc, and further, the main component is pulp. It can be seen that the paper has a better sizing degree of 50 seconds, which is better.
[0051]
On the other hand, the inkjet recording medium for print calibration of Comparative Example 2 having a 60 ° specular gloss on the surface of the ink-receiving layer of greater than 40 is greatly different in texture between the unrecorded portion and the recorded portion, and is difficult to use for print calibration. .
In addition, the inkjet recording medium for print calibration of Comparative Example 3 using wet silica instead of dry silica as the outermost layer of the ink receiving layer has a 60 ° specular gloss of the surface of the ink receiving layer of less than 5, and the unrecorded portion In addition to the greatly different texture of the recording portion, the color reproduction of the recording portion is clearly inferior despite the fact that there is no problem in ink absorbability, so that it is difficult to use for printing proofing.
Further, the commercially available inkjet recording medium for comparative printing of Comparative Example 4 has a problem in ink absorbability in the secondary color and tertiary color parts, and as a result, color reproduction for offset printing cannot be performed. It is difficult to use.
[0052]
【The invention's effect】
In the inkjet recording medium for printing calibration according to the present invention, the ink receiving layer has sufficient ink absorbability, and as a result, sufficiently covers the color reproduction range of printing by a plate making method such as offset printing or gravure printing on printing paper. In addition, it is an excellent ink jet recording medium for print proofing in that it has a finished feeling equivalent to that of a printed matter.

Claims (3)

Applying a coating liquid containing at least a binder and a pigment onto a base material made of paper having pulp as a main component and having an air permeability defined by JIS P8117 of 10 to 300 seconds / 100 cc, and receiving ink. Forming a layer;
Applying a coating liquid containing dry silica and a water-soluble resin on a transfer substrate;
Bonding the film-forming surface of the substrate on which the ink-receiving layer is formed and the coating surface of the transfer substrate coated with the coating liquid containing the dry silica and water-soluble resin;
Drying the bonded substrate,
A step of peeling the transfer substrate and forming an outermost ink receiving layer mainly composed of the dry silica and the water-soluble resin on the surface of the ink receiving layer. A method for producing an ink jet recording medium for printing proofing having a receiving layer. 2. The printing proof according to claim 1, wherein the transfer substrate is a matte film, and the surface of an ink jet recording medium to be produced is 5 to 40% in terms of 60 ° specular gloss as defined in JIS Z8741. For producing an inkjet recording medium. The paper having the pulp as a main component is not less than 50 seconds in terms of a Steecht sizing degree defined in JIS P8122 when the basis weight is 127.9 g / m ^2. 3. A method for producing an inkjet recording medium for printing proofing according to 2.