JP2023043691A - Ink jet printer and ink jet printing method - Google Patents

Abstract

To provide an ink jet printer which has the excellent glossiness difference between low gloss (matte tone) and high gloss (gloss tone), scratch resistance, weather resistance and drying property.SOLUTION: An ink jet printer comprises: an ink storage part which stores ink; a discharge head which discharges the ink; and heating means which heats a printing object. The ink jet printer includes: a low gloss printing mode being the printing mode for applying low gloss, and a high gloss printing mode being the printing mode for applying high gloss. The heating means, when the temperature of the printing object in a low gloss printing region printed in the low gloss printing mode in a case where non-aqueous clear ink is made to adhere to the printing object is Tmatte (°C), and the temperature of the printing object in a high gloss printing region printed in the high gloss printing mode in a case where the non-aqueous clear ink is made to adhere to the printing object is Tgloss (°C), heats the printing object so as to satisfy the formula: Tmatte>Tgloss. The ink has the non-aqueous clear ink which contains a resin, an organic solvent, and water; and aqueous ink which contains the resin, the organic solvent and water. The content of the resin contained in the aqueous ink is equal to or greater than 10 mass%. The organic solvent contained in the aqueous ink includes an organic solvent whose boiling point is equal to or greater than 240°C. The content of the organic solvent whose boiling point is equal to or greater than 240°C is between 1 mass% and 3 mass%.

Description

The present invention relates to an inkjet printing apparatus and an inkjet printing method.

In recent years, permeable recording media such as textiles and canvas fabrics have been used in industrial applications such as wallpapers, advertisements and signboards, and various inks for use in such permeable recording media have been developed.

As such inks, for example, solvent-based inks using an organic solvent as a solvent, ultraviolet curing inks containing polymerizable monomers as a main component, and the like are widely used. However, the solvent-based ink is concerned about environmental impact due to evaporation of the organic solvent. For the UV curable ink, the choice of polymerizable monomers to be used is limited from the viewpoint of safety.
Therefore, an ink set containing a water-based ink, which has a low environmental load and can be directly recorded on a permeable recording medium, has been proposed.

On the other hand, an inkjet recording apparatus having a gloss control function has been developed. For example, a liquid ejecting head capable of ejecting ink containing thermoplastic resin particles from a nozzle toward an impact target, and heating means for heating ink droplets that have landed on the impact target, wherein the heating means is the ink A liquid ejecting apparatus has been proposed that controls the degree of film formation on the surface of an ink droplet by heating at a film formation control temperature corresponding to the minimum film formation temperature at which film formation on the surface of the ink droplet starts (for example, patent Reference 1).

SUMMARY OF THE INVENTION An object of the present invention is to provide an inkjet printing apparatus which is excellent in glossiness difference between low glossiness (matte tone) and high glossiness (glossy tone), scratch resistance, weather resistance and drying property.

An inkjet printing apparatus of the present invention as a means for solving the above-mentioned problems is an inkjet printing apparatus having an ink containing section for containing ink, an ejection head for ejecting ink, and heating means for heating a printed material. The inkjet printing device has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss, and the heating means is the non-aqueous clear ink The temperature of the printed material in the low gloss printing area printed in the low gloss printing mode when attaching to the printed material is T _matte (° C.), and the non-aqueous clear ink is attached to the printed material in the high gloss printing mode Assuming that the temperature of the substrate in the high-gloss printing area to be printed is T _gloss (°C), the following formula, T _matte >T _gloss , is heated so that the ink is a non-aqueous clear ink containing a resin and an organic solvent. Ink and a water-based ink containing a resin, an organic solvent, and water, wherein the content of the resin contained in the water-based ink is 10% by mass or more, and the organic solvent contained in the water-based ink has a boiling point of 240 °C or higher, and the content of the organic solvent with a boiling point of 240°C or higher is 1% by mass or more and 3% by mass or less.

ADVANTAGE OF THE INVENTION According to this invention, the inkjet printing apparatus which is excellent in glossiness difference of low glossiness (matte tone) and high glossiness (glossy tone), abrasion resistance, weather resistance, and drying property can be provided.

FIG. 1 is a diagram showing an example of an image forming apparatus for carrying out the image forming method of the present invention. FIG. 2 is a perspective explanatory view showing an example of a main tank of the image forming apparatus of FIG. 1. FIG.

(Inkjet printing device and inkjet printing method)
An inkjet printing apparatus according to the present invention is an inkjet printing apparatus having an ink storage unit that stores ink, an ejection head that ejects ink, and a heating means that heats an object to be printed. It has a low-gloss print mode that is a print mode that imparts gloss and a high-gloss print mode that is a print mode that imparts high gloss, and low gloss when the heating means adheres the non-aqueous clear ink to the printed material. The temperature of the substrate in the low-gloss print area printed in the print mode is T _matte (° C.), and the substrate in the high-gloss print area printed in the high-gloss print mode when the non-aqueous clear ink is attached to the substrate. When the temperature is T _gloss (° C.), heating is performed so as to satisfy the following formula: T _matte >T _gloss , and the ink is a non-aqueous clear ink containing a resin and an organic solvent, and a resin, an organic solvent, and water. and a water-based ink containing a resin content of 10% by mass or more, an organic solvent contained in the water-based ink containing an organic solvent having a boiling point of 240 ° C. or higher, and the boiling point The content of the organic solvent at 240° C. or higher is 1% by mass or more and 3% by mass or less, and if necessary, other means are provided.

The inkjet printing apparatus of the present invention can obtain printed matter having a low-gloss (matte) print area and a high-gloss (gloss) print area by using a non-aqueous clear ink containing a resin and an organic solvent. .
Further, the inkjet printing apparatus of the present invention can form an image using a water-based ink containing a resin, an organic solvent, and water, and the water-based ink contains 10% by mass or more of the resin. By doing so, weather resistance and abrasion resistance can be improved.
Further, in the inkjet printing apparatus of the present invention, the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. It is possible to improve the durability and scratch resistance.

An inkjet printing apparatus according to the present invention is an inkjet printing apparatus having an ink storage unit that stores ink, an ejection head that ejects ink, and a heating means that heats an object to be printed. A low-gloss print mode that is a print mode that imparts gloss and a high-gloss print mode that is a print mode that imparts high gloss, wherein the temperature of the heating means in the low-gloss print mode is HT _matte (° C.); Assuming that the temperature of the heating means in the high gloss printing mode is HT _gloss (°C), heating is performed so as to satisfy the following formula, HT _matte > HT _gloss , and the ink is a non-aqueous clear ink containing a resin and an organic solvent. and a water-based ink containing a resin, an organic solvent, and water, wherein the content of the resin contained in the water-based ink is 10% by mass or more, and the organic solvent contained in the water-based ink has a boiling point of 240°C. The above organic solvent is included, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less, and if necessary, other means are provided.

In the inkjet printing method of the present invention, an aqueous ink containing 10% by mass or more of a resin, 1% by mass or more and 3% by mass or less of an organic solvent having a boiling point of 240° C. or more, and water is applied to a substrate to form a printing layer. a step of forming, a step of applying non-aqueous clear ink containing a resin and an organic solvent to a printed material, and a heating step of heating the printed material with a heating means, and providing low gloss. It has a low-gloss print mode that is a mode and a high-gloss print mode that is a print mode that imparts high gloss, and prints in the low-gloss print mode when the non-aqueous clear ink is attached to the substrate in the heating step. Let T _matte (° C.) be the temperature of the substrate in the low-gloss printing area, and T be the temperature of the substrate in the high-gloss printing area printed in the high-gloss printing mode when the non-aqueous clear ink is applied to the substrate. When _gloss (° C.) is used, heating is performed so as to satisfy the following formula: T _matte >T _gloss , and other steps are included as necessary.

In the inkjet printing method of the present invention, an aqueous ink containing 10% by mass or more of a resin, 1% by mass or more and 3% by mass or less of an organic solvent having a boiling point of 240° C. or more, and water is applied to a substrate to form a printing layer. a step of forming, a step of applying non-aqueous clear ink containing a resin and an organic solvent to a printed material, and a heating step of heating the printed material with a heating means, and providing low gloss. It has a low gloss print mode that is a mode and a high gloss print mode that is a print mode that imparts high gloss, the temperature of the heating means in the low gloss print mode is HT _matte (° C.), and the temperature of the heating means in the high gloss print mode Assuming that the temperature is HT _gloss (° C.), the following formula, HT _matte >HT _gloss , is satisfied, and other steps are included as necessary.

Conventionally, in inkjet recording devices using clear ink (UV clear ink) that cures when irradiated with ultraviolet rays, gloss can be controlled to low gloss (matte tone) or high gloss (gloss tone) by controlling the amount of irradiation light. Gloss control methods have been proposed. However, the problem with UV clear ink is that it has a strong odor, and the odor remains on printed matter, so it is not suitable for printed matter for indoor use. For this reason, an environment in which the ink jet printing apparatus can be installed needs to be ventilated, and the installation places are limited. In addition, UV clear ink requires an ultraviolet irradiation device, which poses problems of increasing the size and cost of the device.

In the prior art of Patent Document 1, when printing with water-based ink on a permeable recording medium, there is a problem that the water-based ink soaks into the fabric, making it impossible to perform glossy printing. When the improved ink is used, there is a problem that the ink film is fixed on the surface of the material to be printed, resulting in poor scratch resistance.
In the prior art of Patent Document 1, the inkjet printing apparatus and the inkjet printing method of the present invention use a color ink containing a coloring material and use a heating means to set the film formation temperature according to the minimum film formation temperature at which the surface of the ink droplet starts to form a film. Glossiness is adjusted by controlling the degree of film formation on the surface of the ink droplets by heating at the film formation control temperature. This is based on the knowledge that a sufficient difference in glossiness cannot be obtained and that both low glossiness (matte tone) and high glossiness cannot be controlled.

The inkjet printing apparatus and inkjet printing method of the present invention use a non-aqueous clear ink containing a resin and an organic solvent to control both high glossiness (glossy tone) and low glossiness (matte tone) by controlling the heating temperature. conduct. When performing low gloss (matte) application, printing is performed at a higher temperature than in high gloss (gross gloss) application mode. Because the temperature during printing is high, non-aqueous clear ink containing resin suppresses wetting and spreading of dots, suppresses the coalescence of adjacent dots, and forms dots with a high dot sphere height (pile height). be. These dots form surface unevenness and impart low gloss (matte gloss).
When performing high gloss application, printing is performed at a lower temperature than in the low gloss application mode. Because the printing temperature is low, the resin-containing non-aqueous clear ink promotes the wetting and spreading of dots and the coalescence of adjacent dots, forming a smooth surface and imparting high glossiness. .

Image formation can be performed using a water-based ink containing a resin, an organic solvent, and water. It is preferable to print using a water-based resin ink having a coloring material as a color ink. By performing high-gloss (glossy) printing on the surface of a recording medium that has been previously printed with color ink, a layer of non-aqueous clear ink covers the surface of the printed material, improving scratch resistance.

The inkjet printing apparatus of the present invention uses a non-aqueous clear ink containing a resin and an organic solvent, a low gloss print mode that imparts low gloss, and a high gloss print mode that imparts high gloss. and the heating means sets the temperature of the substrate to be printed in the low gloss (matte) _printing area printed in the low gloss printing mode when the non-aqueous clear ink is attached to the substrate to be printed. If the temperature of the substrate in the high-gloss print area printed in the high-gloss print mode when the water-based clear ink is attached to the substrate is T _gloss (° C.), the following formula, T _matte >T _gloss , is satisfied. Or, if the temperature of the heating means in the low gloss printing mode is HT _matte (° C.) and the temperature of the heating means in the high gloss printing mode is HT _gloss (° C.), then the following equation, HT _matte >HT By satisfying _gloss , both low glossiness (matte tone) and high glossiness (glossy tone) can be controlled.

The heating means of the inkjet printing apparatus of the present invention heats the printed material so that the temperature satisfies the following formula: T _matte >T _gloss , and the following formula: T _matte −T _gloss ≥ 10 ° C. Heats so that it satisfies. It is more preferable to heat so as to satisfy the following formula: T _matte −T _gloss ≧20° C. Further, as the temperature HT (°C) of the heating means, the temperature of the heating means in the low gloss printing mode is HT _matte (°C), and the temperature of the heating means in the high gloss printing mode is HT _gloss (°C). , HT _matte >HT _gloss , preferably HT _matte >HT _gloss ≧10° C., more preferably HT _matte >HT _gloss ≧20° C. As a result, in the low-gloss print mode, the heating temperature is raised to suppress wetting and spreading of the dots, forming dots with a high pile height and forming a surface with large unevenness. On the other hand, in the high-gloss print mode, the heating temperature can be lowered to promote wetting and spreading of the dots, and the coalescence of adjacent dots can form a smooth surface. The temperature HT (° C.) of the heating means is not particularly limited and can be appropriately selected according to the purpose. For example, the set temperature of the heating means can be used.

The temperature T _matte (°C) of the printing material in the printing unit in the low gloss printing mode is preferably 50°C or higher, more preferably 50°C or higher and 80°C or lower. The temperature T _gloss (°C) of the printing material in the printing section in the high gloss printing mode is preferably 70°C or lower, more preferably 60°C or lower. The temperature of the heating means in the low gloss printing mode, HT _matte (°C), is preferably 50°C or higher, more preferably 50°C or higher and 80°C or lower. The temperature of the heating means in the high gloss printing mode, HT _gloss (°C), is preferably 70°C or less, more preferably 60°C or less. By setting such a temperature range, it is possible to achieve a large change in glossiness in each print mode using non-aqueous clear ink.
The temperature of the printed material in the printing unit can be measured, for example, by placing a thermocouple on the recording medium as the printed material and directly measuring the temperature of the recording medium, or by measuring the temperature of the heater that heats the recording medium. and a method in which the temperature around the recording medium is measured in a non-contact manner using a radiation thermometer or the like to obtain the recording medium temperature.

In the present invention, if the print rate of a low-gloss (matte) print image printed in the low-gloss print mode is D _matte , and the print rate of a high-gloss (gloss) print image printed in the high-gloss print mode is D _gloss , It is preferable to satisfy the following equation: D _gloss >D _matte , and more preferably to satisfy the following equation: D _gloss −D _matte >10%. The higher the print rate, the easier it is to form a smooth surface, so in the high-gloss print mode, an image with a high print rate is used. On the other hand, in the low-gloss print mode, if the print rate is high, adjacent dots will merge, making it difficult to form surface unevenness. Therefore, an image with a low print rate is used. Here, the printing rate means the following: printing rate (%) = number of clear ink printing dots / (vertical resolution x horizontal resolution) x 100 (wherein the above formula, "number of clear ink printing dots" is "Vertical resolution" and "Horizontal resolution" are the resolutions per unit area, respectively.When printing clear ink overlaid so that the same dot position is printed, , “Number of dots printed with clear ink” is the total number of dots actually printed with clear ink per unit area.)
Note that the print rate of 100% means the maximum single-color ink weight for a pixel.

<Ink container>
The ink containing section contains non-aqueous clear ink and water-based ink.
The ink containing portion is not particularly limited as long as it is a member capable of containing ink, and can be appropriately selected according to the purpose. Examples thereof include an ink containing container and an ink tank.
The ink storage container stores the non-aqueous clear ink and the water-based ink in the container, and further includes other members appropriately selected as necessary. The container is not particularly limited, and its shape, structure, size, material, etc. can be appropriately selected according to the purpose. Those having at least are included.
Examples of the ink tank include a main tank and a sub-tank.

<Ejection head>
The ejection head applies ink to a material to be printed to form a print layer.
The ejection head has a nozzle plate, a pressure chamber, and a stimulus generator.

－Nozzle plate－
The nozzle plate has a nozzle substrate and an ink-repellent film on the nozzle substrate.

－Pressurized chamber－
The pressurizing chambers are a plurality of individual flow paths that are individually arranged corresponding to the plurality of nozzle holes provided in the nozzle plate and communicate with the nozzle holes. They are also called pressure chambers, discharge chambers, liquid chambers, and the like.

- Stimulus generating means -
The stimulus generating means is means for generating a stimulus to be applied to ink.
The stimulus in the stimulus generating means is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include heat (temperature), pressure, vibration and light. These may be used individually by 1 type, and may use 2 or more types together. Among these, heat (temperature) and pressure are preferred.
The stimulus generating means is not particularly limited and can be appropriately selected according to the purpose. Specifically, the stimulus generating means includes a piezoelectric actuator such as a piezoelectric element, a thermal actuator utilizing a phase change due to boiling of an ink film using an electrothermal conversion element such as a heating resistor, and a metal phase change due to a temperature change. and a shape memory alloy actuator using an electrostatic force, an electrostatic actuator using an electrostatic force, and the like.

When the stimulus is "heat", thermal energy corresponding to a recording signal is applied to the ink in the ink ejection head using, for example, a thermal head. A method of generating air bubbles in the ink by the thermal energy and ejecting the ink as droplets from the nozzle holes of the nozzle plate by the pressure of the air bubbles can be used.
When the stimulus is "pressure", for example, by applying a voltage to the piezoelectric element adhered to the position called the pressure chamber in the ink flow path in the ink discharge head, the piezoelectric element bends. . As a result, the volume of the pressure chamber shrinks, and the ink is ejected as droplets from the nozzle holes of the ink ejection head.
Among these, the piezo method in which a voltage is applied to a piezo element to cause ink to fly is preferable.

<Heating Means>
The heating means heats the material to be printed. The heating means includes means for heating and drying the printing surface and the back surface of the recording medium as the printing material.The heating means is not particularly limited and can be appropriately selected according to the purpose. A heater, a hot air heater, a heating roller, and the like can be used. These may be used individually by 1 type, and may use 2 or more types together.

The method for drying the recording medium as the material to be printed is not particularly limited and can be appropriately selected according to the purpose. a method of contacting a recording medium to which ink has been applied and a heating member to heat by heat transfer; a method of heating a recording medium to which ink has been applied by irradiating energy rays such as infrared rays and far infrared rays. etc.
The heating can be performed before, during, and/or after printing.
By heating before and during printing, it is possible to print on a heated medium, and by heating after printing, the printed matter can be dried.
The heating time is not particularly limited as long as the surface temperature of the recording medium can be controlled to a desired temperature, and can be appropriately selected according to the purpose.
It is preferable to control the heating time by controlling the conveying speed of the recording medium as the material to be printed.

<Non-aqueous clear ink>
The non-aqueous clear ink is colorless and transparent non-aqueous ink containing substantially no coloring material and water, and means an ink containing an organic solvent as a solvent.
"Substantially free of coloring material" means that the content of coloring material is less than 0.5% by mass, and "substantially free of water" means that the content of water is less than 1% by mass. It means that there is The non-aqueous clear ink can contain a colorant and water as impurities.
The non-aqueous clear ink contains a resin and an organic solvent, preferably contains a surfactant, and further contains other components as necessary.

<Resin>
The resin is not particularly limited and can be appropriately selected depending on the purpose. Examples include polyurethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, and vinyl chloride. resins, acrylic-styrene resins, acrylic-silicone resins, and the like.
When producing the ink, it is preferable to add these resin particles as resin particles. The resin particles may be added to the ink in the form of a resin emulsion dispersed using water as a dispersion medium. As the resin particles, appropriately synthesized ones may be used, or commercially available products may be used. These may be used singly or in combination of two or more resin particles.

Non-aqueous emulsion type polymer particles can also be used as the resin. Non-aqueous emulsion-type polymer particles are dispersions in which particles of polyurethane resin, acrylic resin, acrylic polyol resin, or the like are stably dispersed in an organic solvent.
The non-aqueous emulsion-type polymer particles are not particularly limited and can be appropriately selected according to the purpose. Examples include polyurethane resins and acrylic polyol resins such as “N-2043-60MEX” and “N-2043-AF-1” manufactured by Harima Chemicals.

The content of the resin contained in the non-aqueous clear ink is preferably 9% by mass or more, and more preferably 9% by mass or more and 25% by mass or less. When the content is 9% by mass or more, low glossiness (matte glossiness) and high glossiness (gross glossiness) can be controlled even with a small amount of non-aqueous clear ink. When the content is 25% by mass or less, the ejection stability of the ink is improved.

Low-gloss (matte-gloss) printed matter is realized by forming isolated dots with high dot sphere heights (pile height), giving unevenness to the surface, and making the printed matter low-gloss (matte).
When the content of the resin in the non-aqueous clear ink is high, dots having a high pile height are likely to be formed, which is preferable from the viewpoint of facilitating the production of low-gloss prints.
On the other hand, high-gloss (glossy) printed matter is imparted with smoothness by filling unevenness on the surface with a non-aqueous clear ink to form a smooth surface. In order to fill the unevenness of the surface with non-aqueous clear ink, the higher the resin content in the non-aqueous clear ink, the less amount of non-aqueous clear ink can be used to fill in the unevenness of the surface, resulting in a high-gloss print. It is preferable because it is easy.

<Organic solvent>
The organic solvent is not particularly limited and can be appropriately selected depending on the intended purpose. ketones, carboxylic acid esters such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, ethers such as diethyl ether, dipropyl ether, alkylene glycol ether compounds, tetrahydrofuran, dioxane, etc. is mentioned. These may be used individually by 1 type, and may use 2 or more types together. Among these, one or more of alkylene glycol ether compounds, alkylene glycol monoether compounds, and lactone compounds are preferably included because they are liquid at normal temperature and normal pressure.

The alkylene glycol ether compound is not particularly limited and can be appropriately selected depending on the intended purpose. Examples include ethylene glycol-based ethers and propylene glycol-based ethers based on allyl and phenyl groups having double bonds. The alkylene glycol ether compound is colorless and has little odor, and since it has an ether group and a hydroxyl group in its molecule, it has the properties of both alcohols and ethers and is liquid at room temperature. In addition, there are a monoether type in which only one hydroxyl group is substituted and a diether type in which both hydroxyl groups are substituted, and these can be used in combination.

The alkylene glycol monoether compound is not particularly limited and can be appropriately selected depending on the purpose. Examples include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, and ethylene glycol monohexyl. Ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, tetraethylene Glycol monomethyl ether, tetraethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether and the like. These may be used individually by 1 type, and may use 2 or more types together.

The alkylene glycol diether compound is not particularly limited and can be appropriately selected depending on the intended purpose. Ethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol dibutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether and the like. These may be used individually by 1 type, and may use 2 or more types together.

The lactone compound is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include γ-butyrolactone, δ-valerolactone and ε-caprolactone.
Other non-aqueous solvents such as lactic acid ester, propylene glycol monomethyl ether acetate (PMA), 2-butoxyethyl acetate (BMGAC), propylene diglycol acetate (PGDA), dipropylene glycol dimethyl ether (DMM), 3-methoxy- n-butyl-acetate (MBA), 1-butoxy-2-propanol (PNB), 2-octanone, and the like.

The content of the organic solvent contained in the non-aqueous clear ink is not particularly limited and can be appropriately selected according to the purpose. 60% by mass or less is preferable, and 20% by mass or more and 60% by mass or less is more preferable.

<Surfactant>
The non-aqueous clear ink preferably contains a surfactant.
By adding a surfactant to the ink, the surface tension is lowered, and the penetration of the ink droplets into the recording medium after landing on the paper or the like becomes faster, so feathering and color bleeding can be reduced. can be done.
Surfactants are classified into nonionic, anionic, and amphoteric according to the polarity of the hydrophilic group.
They are also classified into fluorine-based, silicone-based, acetylene-based, etc., depending on the structure of the hydrophobic group.
In the present invention, fluorine-based surfactants are mainly used, but silicone-based surfactants and acetylene-based surfactants may be used in combination.
The content of the surfactant is preferably 2% by mass or less, more preferably 0.05% by mass or more and 2% by mass or less, and still more preferably 0.1% by mass or more and 2% by mass or less. By setting the surfactant content to 2% by mass or less, a significant reduction in glossiness can be obtained in a low gloss (matte gloss) print mode.

The surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. Examples include surfactants.

The silicone-based surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include polydimethylsiloxane modified at both ends, and those having a polyoxyethylene group or polyoxyethylene polyoxypropylene group as a modifying group, which are not decomposed even at high pH.
As the silicone-based surfactant, an appropriately synthesized one may be used, or a commercially available product may be used. The commercial product is not particularly limited and can be appropriately selected according to the purpose. etc.

As the silicone-based surfactant, a polyether-modified silicone-based surfactant can be used, and examples thereof include compounds in which a polyalkylene oxide structure is introduced into the side chain of the Si portion of dimethylsiloxane.
The polyether-modified silicone-based surfactant is not particularly limited and can be appropriately selected according to the purpose. Examples include those introduced into the side chain of the Si portion of polysiloxane.

（但し、前記一般式（Ｓ－１）式中、ｍ、ｎ、ａ、及びｂは、それぞれ独立に、整数を表し、Ｒは、アルキレン基を表し、Ｒ’は、アルキル基を表す。） [General formula (S-1)]

(However, in the general formula (S-1), m, n, a, and b each independently represent an integer, R represents an alkylene group, and R' represents an alkyl group.)

As the polyether-modified silicone-based surfactant, an appropriately synthesized one may be used, or a commercially available product may be used. The commercial product is not particularly limited and can be appropriately selected depending on the purpose. SS-1906EX (manufactured by Nippon Emulsion Co., Ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, FZ-2164 (manufactured by Dow Corning Toray Silicone Co., Ltd.), BYK-33, BYK-387 (manufactured by BYK-Chemie Co., Ltd.), TSF4440, TSF4452, TSF4453 (manufactured by Toshiba Silicon Co., Ltd.) and the like.

Examples of the fluorine-based surfactant include perfluoroalkylsulfonic acid compounds, perfluoroalkylcarboxylic acid compounds, perfluoroalkylphosphoric acid ester compounds, perfluoroalkylethylene oxide adducts, and perfluoroalkyl ether groups in side chains. and polyoxyalkylene ether polymer compounds having a polyoxyalkylene ether polymer compound, and these are preferable because of their low foamability.
Examples of the perfluoroalkylsulfonic acid compound include perfluoroalkylsulfonic acid and perfluoroalkylsulfonate.
Examples of the perfluoroalkylcarboxylic acid compounds include perfluoroalkylcarboxylic acids and perfluoroalkylcarboxylic acid salts.
As the polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in a side chain, a sulfate ester salt of a polyoxyalkylene ether polymer having a perfluoroalkyl ether group in a side chain, and a perfluoroalkyl ether group in a side chain Examples thereof include salts of polyoxyalkylene ether polymers.
Counter ions of _the salt _in the fluorosurfactant include Li, Na, K, _NH4 , _{NH3CH2CH2OH , NH2} ( _CH2CH2OH ) ₂ , _and NH( _CH2CH2OH ). ₃ and the like.

Examples of the amphoteric surfactant include laurylaminopropionate, lauryldimethylbetaine, stearyldimethylbetaine, lauryldihydroxyethylbetaine and the like.

Examples of nonionic surfactants include polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ester, polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene propylene block polymer, sorbitan fatty acid ester, and polyoxyethylene. Examples include sorbitan fatty acid esters and ethylene oxide adducts of acetylene alcohol.

Examples of the anionic surfactant include polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, laurate, polyoxyethylene alkyl ether sulfate, and the like. These may be used individually by 1 type, or may use 2 or more types together.

As the fluorosurfactant, a fluorine-substituted compound having 2 to 16 carbon atoms is preferable, and a fluorine-substituted compound having 4 to 16 carbon atoms is more preferable.
Examples of the fluorosurfactant include perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in side chains. Among these, polyoxyalkylene ether polymer compounds having a perfluoroalkyl ether group in a side chain are preferred because of their low foamability, and are represented by the following general formulas (F-1) and (F-2). is more preferred.

前記一般式（Ｆ－１）で表される化合物において、ｍは、０～１０の整数が好ましく、ｎは、０～４０の整数が好ましい。 [General formula (F-1)]

In the compound represented by the general formula (F-1), m is preferably an integer of 0-10, and n is preferably an integer of 0-40.

[General formula (F-2)]
CnF _2n+1 -CH ₂ CH(OH)CH ₂ -O-(CH ₂ CH ₂ O)aY
In the compound represented by the general formula (F-2), Y is H, or C _m F _2m+1 and m is an integer of 1 to 6, or CH ₂ CH(OH)CH ₂ —C _m F _2m+1 and m is an integer from 4 to 6, or C _p H _2p+1 where p is an integer from 1 to 19; n is an integer of 1-6. a is an integer from 4 to 14;

A commercially available product may be used as the fluorosurfactant. Examples of the commercially available products include Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, S-145 (all manufactured by Asahi Glass Co., Ltd.), Fleurard FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, FC-431 (all manufactured by Sumitomo 3M), Megafac F-470, F-1405 , F-474 (both manufactured by DIC Corporation), Zonyl TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, UR, Capstone FS-30, FS-31 , FS-3100, FS-34, FS-35 (all manufactured by Chemours), FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by Neos Co., Ltd. ), Polyfox PF-136A, PF-156A, PF-151N, PF-154, PF-159 (all manufactured by Omnova), and Unidyne DSN-403N (manufactured by Daikin Industries, Ltd.). Among these, FS-3100, FS-34, FS-300 manufactured by Chemours, and Neos Co., Ltd. are used because they significantly improve good print quality, color development, permeability to paper, wettability, and level dyeing. FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW manufactured by Omnova, Polyfox PF-151N manufactured by Omnova, and Unidyne DSN-403N manufactured by Daikin Industries, Ltd. are preferable.

<Other ingredients>
The other components contained in the non-aqueous clear ink are not particularly limited and can be selected according to the purpose, and examples thereof include antifoaming agents, antiseptic antifungal agents, antirust agents, pH adjusters, and the like. .

- Defoamer -
The antifoaming agent is not particularly limited, and examples thereof include silicone antifoaming agents, polyether antifoaming agents, and fatty acid ester antifoaming agents. These may be used individually by 1 type, or may use 2 or more types together. Among these, silicone-based antifoaming agents are preferred because of their excellent foam breaking effect.

- Antiseptic and antifungal agent -
The antiseptic and antifungal agent is not particularly limited, and examples thereof include 1,2-benzisothiazolin-3-one.

-anti-rust-
The rust inhibitor is not particularly limited, and examples thereof include acidic sulfites and sodium thiosulfate.

-pH adjuster-
The pH adjusting agent is not particularly limited as long as it can adjust the pH to 7 or higher, and examples thereof include amines such as diethanolamine and triethanolamine.

The physical properties of the non-aqueous clear ink are not particularly limited and can be appropriately selected according to the purpose. For example, viscosity, surface tension, pH, etc. are preferably within the following ranges.

The viscosity of the non-aqueous clear ink at 25° C. is not particularly limited and can be appropriately selected depending on the intended purpose. , preferably 5 mPa·s or more and 30 mPa·s or less, more preferably 5 mPa·s or more and 25 mPa·s or less.
As the viscosity, for example, using a rotary viscometer (manufactured by Toki Sangyo Co., Ltd., RE-80L), at 25 ° C., standard cone rotor (1 ° 34' × R24), sample liquid volume 1.2 mL, It can be measured under the measurement conditions of 50 rpm and 3 minutes.

The surface tension of the non-aqueous clear ink at 25° C. is not particularly limited and can be appropriately selected depending on the purpose. 35 mN/m or less is preferable, and 32 mN/m or less is more preferable.

The pH of the non-aqueous clear ink is not particularly limited and can be appropriately selected according to the purpose. is more preferred.

<Water-based ink>
The water-based ink contains a resin, an organic solvent and water, preferably contains a coloring material and a surfactant, and further contains other components as necessary.
The water-based ink has a resin content of 10% by mass or more. Thereby, weather resistance and abrasion resistance can be improved.
The water-based ink contains an organic solvent with a boiling point of 240° C. or higher, and the content of the organic solvent with a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. When the content is 1% by mass or more, the weather resistance can be improved, and when the content is 3% by mass or less, the abrasion resistance can be improved.

<Resin>
The resin is not particularly limited and can be appropriately selected depending on the intended purpose. Resins, vinyl chloride-based resins, acrylstyrene-based resins, acrylsilicone-based resins, etc. may be mentioned, and resin particles made of these resins may also be used. Among these, polyurethane resins are preferred.
Ink can be obtained by mixing the resin particles in a state of a resin emulsion in which water is dispersed as a dispersion medium with a material such as a coloring material or an organic solvent. As the resin particles, appropriately synthesized ones may be used, or commercially available products may be used. Moreover, these may be used individually by 1 type, or may be used in combination of 2 or more types of resin particles.

The polyurethane resin is a reactive product of polyisocyanate and polyol, and exhibits the performance of a soft segment composed of a polyol component with weak cohesive force and a hard segment composed of urethane bonds with strong cohesive force. The soft segment is soft and resistant to substrate deformation such as stretching and bending, while the hard segment has high adhesion to the substrate and excellent abrasion resistance.

The polyurethane resin is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include polyether-based urethane resins, polyester-based urethane resins, and polycarbonate-based urethane resins.

The content of the resin is 10% by mass or more, more preferably 35% by mass or more and 40% by mass or less, from the viewpoint of drying property.

The volume average particle diameter of the resin particles is not particularly limited and can be appropriately selected according to the intended purpose. It is more preferably 10 nm or more and 200 nm or less, and particularly preferably 10 nm or more and 100 nm or less. The volume average particle diameter can be measured, for example, using a particle size analyzer (Nanotrack Wave-UT151, manufactured by Microtrack Bell Co., Ltd.).

<Organic solvent>
The organic solvent includes an organic solvent having a boiling point of 240°C or higher, and may optionally include other organic solvents having a boiling point of lower than 240°C. Since the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, it is possible to ensure sufficient fixability to wallpaper and canvas fabric, and to suppress drying in the vicinity of the nozzle to reduce ejection failure. can.

The organic solvent having a boiling point of 240°C or higher is not particularly limited and can be appropriately selected depending on the intended purpose. Acetate (boiling point: 246.8°C to 247°C), 2-ethyl-1,3-hexanediol (boiling point: 241°C to 249°C), ethylene glycol monophenyl ether (boiling point: 247°C), 2-pyrrolidone (boiling point : 245°C), and the like.

The content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less, preferably 1.2% by mass or more and 2% by mass or less. When the content is 1% by mass or more, the weather resistance can be improved, and when the content is 3% by mass or less, the abrasion resistance can be improved.

The other organic solvent is not particularly limited, and a water-soluble organic solvent can be used. Examples thereof include polyhydric alcohols, ethers such as polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds. Specific examples of polyhydric alcohols include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, and 1,4-butane. Diol, 2,3-butanediol, 3-methyl-1,3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol , 2,4-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl- 1,3-pentanediol, petriol and the like. Examples of polyhydric alcohol alkyl ethers include ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, propylene glycol monoethyl ether and the like. Examples of polyhydric alcohol aryl ethers include ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether. Nitrogen-containing heterocyclic compounds include 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, γ-butyrolactone and the like. mentioned. Amides include formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, 3-butoxy-N,N-dimethylpropionamide and the like. Amines include monoethanolamine, diethanolamine, triethylamine, and the like. Examples of sulfur-containing compounds include dimethylsulfoxide, sulfolane, thiodiethanol and the like. Other organic solvents include propylene carbonate and ethylene carbonate. It is preferable to use an organic solvent having a boiling point of 250° C. or less because it not only functions as a wetting agent but also provides good drying properties.

As the organic solvent, polyol compounds having 8 or more carbon atoms and glycol ether compounds are also preferably used. Specific examples of polyol compounds having 8 or more carbon atoms include 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol. Specific examples of glycol ether compounds include polyhydric alcohol alkyls such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether. Ethers; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, and the like.
The composition of the organic solvent having a temperature of 270° C. or higher is preferably 6% or more, more preferably 10% or more, in the ink composition.

<Water>
The water content is 1% by mass or more, preferably 1% by mass or more and 10% by mass or less, from the viewpoint of ink drying property and ejection reliability.

<Color material>
As the coloring material, for example, pigments and dyes can be used.

An inorganic pigment or an organic pigment can be used as the pigment. These may be used individually by 1 type, and may use 2 or more types together. Mixed crystals may also be used as pigments.
Examples of the pigments that can be used include black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, glossy color pigments such as gold and silver, and metallic pigments.
The inorganic pigment is not particularly limited and can be appropriately selected depending on the intended purpose. and carbon black produced by the method. Examples of the known methods include contact method, furnace method, thermal method, and the like.
The organic pigment is not particularly limited and can be appropriately selected depending on the intended purpose. , indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (eg, basic dye chelates, acid dye chelates, etc.), nitro pigments, nitroso pigments, aniline black, and the like. Among these pigments, those having good affinity with the solvent are preferably used. In addition, resin hollow particles and inorganic hollow particles can also be used.

For black pigments, carbon black (C.I. Pigment Black 7) such as furnace black, lamp black, acetylene black, channel black, etc., or copper, iron (C.I. Pigment Black 11), titanium oxide and organic pigments such as aniline black (C.I. Pigment Black 1). Further, for color, C.I. I. Pigment yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104 , 108, 109, 110, 117, 120, 138, 150, 153, 155, 180, 185, 213, C.I. I. Pigment Orange 5, 13, 16, 17, 36, 43, 51, C.I. I. Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48:2 (Permanent Red 2B (Ca)), 48:3, 48:4, 49:1, 52:2, 53: 1, 57:1 (brilliant carmine 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88, 101 (red red), 104, 105, 106, 108 (cadmium red), 112, 114, 122 (quinacridone magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209, 213, 219, 224, 254, 264, C.I. I. Pigment Violet 1 (rhodamine lake), 3, 5:1, 16, 19, 23, 38, C.I. I. Pigment Blue 1, 2, 15 (phthalocyanine blue), 15:1, 15:2, 15:3, 15:4 (phthalocyanine blue), 16, 17:1, 56, 60, 63, C.I. I. Pigment Green 1, 4, 7, 8, 10, 17, 18, 36 and the like.

The dye is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include acid dyes, direct dyes, reactive dyes and basic dyes. These may be used individually by 1 type, and may use 2 or more types together.
Examples of the dye include C.I. I. Acid Yellow 17, 23, 42, 44, 79, 142, C.I. I. Acid Red 52, 80, 82, 249, 254, 289, C.I. I. Acid Blue 9,45,249, C.I. I. Acid Black 1, 2, 24, 94, C.I. I. Food Black 1, 2, C.I. I. Direct Yellow 1, 12, 24, 33, 50, 55, 58, 86, 132, 142, 144, 173, C.I. I. Direct Red 1, 4, 9, 80, 81, 225, 227, C.I. I. Direct Blue 1, 2, 15, 71, 86, 87, 98, 165, 199, 202, C.I. I. Directed Black 19, 38, 51, 71, 154, 168, 171, 195, C.I. I. Reactive Red 14, 32, 55, 79, 249, C.I. I. Reactive Black 3, 4, 35 can be mentioned.

The content of the coloring material is not particularly limited and can be appropriately selected depending on the intended purpose. more preferred.

Examples of the method of dispersing the pigment to obtain an ink include a method of introducing a hydrophilic functional group into the pigment to make it a self-dispersing pigment, a method of coating the surface of the pigment with a resin and dispersing it, and a method of dispersing using a dispersant. and the like.
As a method of making a self-dispersing pigment by introducing a hydrophilic functional group into a pigment, for example, a method of adding a functional group such as a sulfone group or a carboxyl group to a pigment (for example, carbon) to make it dispersible in water. is mentioned.
As a method of coating the surface of a pigment with a resin and dispersing it, there is a method of encapsulating the pigment in microcapsules to make it dispersible in water. This can be rephrased as a resin-coated pigment. In this case, all the pigments mixed in the ink need not be coated with a resin, and uncoated pigments or partially coated pigments may be dispersed in the ink as long as the effects of the present invention are not impaired. may be
Examples of the method of dispersing using a dispersant include a method of dispersing using a known low-molecular-weight dispersant and high-molecular-weight dispersant typified by surfactants.
As the dispersant, it is possible to use, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc. depending on the pigment. As a dispersant, RT-100 (nonionic surfactant) manufactured by Takemoto Yushi Co., Ltd. and sodium naphthalenesulfonate formalin condensate can also be suitably used as a dispersant. A dispersing agent may be used individually by 1 type, or may use 2 or more types together.

<Pigment dispersion>
Inks can be obtained by mixing materials such as water and organic solvents with pigments. Ink can also be produced by mixing a pigment, water, a dispersant, and the like to form a pigment dispersion, and then mixing materials such as water and an organic solvent.
The pigment dispersion is obtained by dispersing water, a pigment, a pigment dispersant, and optionally other components, and adjusting the particle size. Dispersion should be carried out using a disperser.
The particle size of the pigment in the pigment dispersion is not particularly limited, but the dispersion stability of the pigment is improved, and the image quality such as ejection stability and image density is improved, so the maximum frequency is 20 nm in terms of maximum number. 500 nm or less is preferable, and 20 nm or more and 150 nm or less is more preferable. The particle size of the pigment can be measured using a particle size analyzer (Nanotrack Wave-UT151, manufactured by Microtrack Bell Co., Ltd.).
The content of the pigment in the pigment dispersion is not particularly limited and can be appropriately selected according to the purpose. % or more and 50 mass % or less is preferable, and 0.1 mass % or more and 30 mass % or less is more preferable.
The pigment dispersion is preferably degassed by filtering coarse particles with a filter, a centrifugal separator, or the like, if necessary.

<Other ingredients>
The other components contained in the water-based ink are not particularly limited and can be appropriately selected depending on the purpose. agents and the like.
The other components contained in the water-based ink may be the same as the other components used in the non-aqueous clear ink.

The physical properties of the water-based ink are not particularly limited and can be appropriately selected according to the purpose. For example, viscosity, surface tension, pH, etc. are preferably within the following ranges.

The viscosity of the water-based ink at 25° C. is not particularly limited and can be appropriately selected according to the purpose. · s or more and 30 mPa·s or less is preferable, and 6.5 mPa·s or more and 25 mPa·s or less is more preferable.
The viscosity of the water-based ink at 40° C. is not particularly limited and can be appropriately selected according to the purpose. .5 mPa·s or more and 30 mPa·s or less is preferable.
As the viscosity, for example, using a rotary viscometer (manufactured by Toki Sangyo Co., Ltd., RE-80L), at 25 ° C., standard cone rotor (1 ° 34' × R24), sample liquid volume 1.2 mL, It can be measured under the measurement conditions of 50 rpm and 3 minutes.

The surface tension of the water-based ink at 25° C. is not particularly limited and can be appropriately selected depending on the purpose. Therefore, it is preferably 35 mN/m or less, more preferably 32 mN/m or less.

The pH of the water-based ink is not particularly limited and can be appropriately selected according to the intended purpose. preferable.

<Substrate to be printed>
Materials to be printed are not limited to those used as recording media. For example, wallpaper, floor materials, building materials such as tiles, clothing fabrics such as T-shirts, textiles, leather, and the like can be used as appropriate. Ceramics, glass, metal, etc. can also be used as the material to be printed by adjusting the configuration of the path for conveying the recording medium.
The recording medium is not particularly limited, and plain paper, glossy paper, special paper, cloth, and the like can be used.
The non-permeable substrate is a substrate having a surface with low water permeability and low absorbency, and includes materials that do not open to the outside even if there are many cavities inside. , refers to a substrate having a water absorption of 10 mL/m ² or less from the start of contact to 30 msec ^1/2 in the Bristow method.
As the impermeable substrate, for example, plastic films such as vinyl chloride resin films, polyethylene terephthalate (PET) films, acrylic resin films, polypropylene films, polyethylene films, and polycarbonate films can be suitably used.

In the present invention, it is preferable to use a high-gloss printing material in the low-gloss print mode. A substrate having a high glossiness is preferable because the low glossiness effect of the clear ink tends to be emphasized.
On the other hand, in the high-gloss print mode, it is preferable to use a printing material with low glossiness. A substrate having a low glossiness is preferable because the high-gloss effect of the clear ink tends to be emphasized.
Therefore, when the glossiness of the printed material used in the low-gloss print mode is G _matte and the glossiness of the printed material used in the high-gloss print mode is G _gloss , it is preferable to satisfy the following formula, G _matte > G _gloss , It is more preferable to satisfy G _matte −G _gloss ≧100.

(Method for controlling glossiness of printed image)
As a method for controlling the glossiness of a printed image according to the present invention,
A printing step of ejecting ink onto a printed material to provide a printing layer;
a heating step of heating the printed substrate;
A printed image glossiness control method comprising:
The ink is a water-based clear ink containing resin and water,
The method for controlling the glossiness of the printed image has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
When printing in the low gloss print mode, control is performed to increase the heating temperature,
When printing in the high gloss print mode, control is performed to lower the heating temperature.

(printed matter)
A printed material according to the present invention is a printed material having a material to be printed and a printing layer on the material to be printed, wherein the printing layer comprises a clear ink layer containing a resin,
The printed matter has a low-gloss (matte) print image printed in a low-gloss (matte-gloss) print mode and a high-gloss (gloss) print image printed in a high-gloss (gloss) print mode,
The glossiness difference (Ga-Gb) between the 60° glossiness Ga of the high gloss (gloss) print image and the 60° glossiness Gb of the substrate used in the high gloss (gloss) printing mode is 20 or more,
The glossiness difference (Gc-Gd) between the 60° glossiness Gc of the low gloss (matte) printed image and the 60° glossiness Gd of the substrate used in the low gloss (matte gloss) printing mode is -20 or less. , an inkjet printing apparatus and an inkjet printing method to form an image to obtain a printed matter.

In the following description of the inkjet printing apparatus and inkjet printing method of the present invention, black (K) ink, cyan (C) ink, magenta (M) ink, and yellow (Y) ink are used. Alternatively, or in addition, water-based clear ink can be used.
The water-based clear ink used in the present invention can be suitably used for various inkjet recording apparatuses, such as printers, facsimile machines, copiers, printer/fax/copier complex machines, stereolithography machines, and the like.
Unless otherwise specified, the inkjet printing apparatus includes both a serial type apparatus in which the ejection head is moved and a line type apparatus in which the ejection head is not moved.
Further, the inkjet printing apparatus includes not only desktop type but also wide-width recording apparatus and continuous paper printers capable of using, for example, a roll of continuous paper as a recording medium.
In the present invention, an inkjet printing apparatus and an inkjet printing method refer to an apparatus capable of ejecting ink, various treatment liquids, and the like onto a recording medium, and a method of performing recording using the apparatus. A recording medium means a medium to which ink and various treatment liquids can adhere even temporarily.
The inkjet printing apparatus may include not only a head portion for ejecting ink, but also means for feeding, conveying, and ejecting a recording medium, as well as devices called pre-processing devices and post-processing devices. can.
Moreover, the inkjet printing apparatus and the inkjet printing recording method are not limited to those in which significant images such as characters and figures are visualized by ink. For example, it includes those that form patterns such as geometric patterns, and those that form three-dimensional images.
Further, unless otherwise specified, the inkjet printing apparatus includes both a serial type apparatus in which the ejection head is moved and a line type apparatus in which the ejection head is not moved.
Further, the inkjet printing apparatus is not limited to desktop type, and wide recording apparatus capable of printing on A0 size recording medium. For example, a roll of continuous paper can be used as the recording medium. A capable continuous printer is also included.

An example of the inkjet printing apparatus will be described with reference to FIGS. 1 and 2. FIG.
FIG. 1 is a perspective explanatory view of the inkjet printing apparatus. FIG. 2 is a perspective explanatory view of the main tank. An image forming apparatus 400 as an example of the inkjet printing apparatus is a serial image forming apparatus. A mechanical unit 420 is provided inside the exterior 401 of the image forming apparatus 400 . Each ink container 411 of the main tank 410 (410k, 410c, 410m, 410y) for each color of black (K), cyan (C), magenta (M), and yellow (Y) is made of, for example, an aluminum laminated film. It is formed by a packaging member. The ink containing portion 411 is housed, for example, in a container case 414 made of plastic. Thus, the main tank 410 is used as an ink cartridge for each color.
On the other hand, a cartridge holder 404 is provided on the far side of the opening when the cover 401c of the apparatus main body is opened. A main tank 410 is detachably attached to the cartridge holder 404 . As a result, each ink discharge port 413 of the main tank 410 communicates with the ejection head 434 for each color via the supply tube 436 for each color, and ink can be ejected from the ejection head 434 onto the printing medium.

The inkjet printing apparatus can include not only a part that ejects ink, but also devices called pre-processing devices and post-processing devices.
As an aspect of the pre-treatment device and the post-treatment device, a liquid having a pre-treatment liquid and a post-treatment liquid as in the case of black (K), cyan (C), magenta (M), yellow (Y) ink, etc. There is a mode in which a storage section and a liquid ejection head are added, and the pretreatment liquid and the posttreatment liquid are ejected by an inkjet recording method.
As another aspect of the pre-treatment device and the post-treatment device, there is an aspect in which a pre-treatment device and a post-treatment device using a method other than the inkjet recording method, such as a blade coating method, a roll coating method, and a spray coating method, are provided.

It should be noted that the method of using the ink is not limited to the ink jet recording method, and can be widely used. In addition to the inkjet recording method, for example, a blade coating method, a gravure coating method, a bar coating method, a roll coating method, a dip coating method, a curtain coating method, a slide coating method, a die coating method and a spray coating method can be used.

The use of the ink is not particularly limited and can be appropriately selected according to the intended purpose. Furthermore, it can be used not only as an ink to form two-dimensional characters and images, but also as a three-dimensional modeling material for forming a three-dimensional three-dimensional image (three-dimensional object).
A known three-dimensional modeling apparatus for forming three-dimensional objects can be used, and is not particularly limited. be able to. The three-dimensional object includes a three-dimensional object obtained by applying ink repeatedly. It also includes a molded product obtained by processing a structure obtained by applying ink onto a base material such as a recording medium. The molded product is, for example, a sheet-shaped or film-shaped recorded matter or structure that has been subjected to molding such as heat stretching, punching, etc.・Suitably used for applications where molding is performed after the surface is decorated, such as electronic equipment, meters for cameras, and operation panels.

In the present invention, the terms image formation, recording, printing, and printing are all synonymous.
The terms recording medium, medium, and printed material are all synonymous.

Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Production example 1)
-Production of non-aqueous clear ink A-
Commercially available urethane resin liquid (Sampren IB-F370, manufactured by Sanyo Chemical Industries, Ltd., non-volatile matter: 40% by mass, non-aqueous, solvent: mixed solvent of methoxypropanol and isopropanol) 19.5% by mass, diethylene glycol diethyl ether 55% by mass , γ-butyrolactone 13.1% by mass, tetraethylene glycol dimethyl ether 10% by mass, silicone surfactant (BYK-UV3500, manufactured by BYK) 0.6% by mass, and acetylene glycol surfactant (E-1010, Nissin Chemical Industry Co., Ltd.) 1.8% by mass was added, mixed and stirred to prepare a mixture.
Next, the obtained mixture was filtered through a polypropylene filter having an average pore size of 0.2 μm (trade name: Betafine polypropylene pleated filter PPG series, manufactured by 3M) to prepare non-aqueous clear ink A.

(Production Examples 2-3)
-Production of non-aqueous clear inks B to C-
Non-aqueous clear inks B to C were prepared in the same manner as in Production Example 1, except that the ink compositions in Production Example 1 were changed to those shown in Table 1.

Details of each component in Table 1 are as follows.
- Urethane resin liquid (Sampren IB-F370, manufactured by Sanyo Chemical Industries, Ltd., non-volatile matter: 40% by mass, non-aqueous, solvent: mixed solvent of methoxypropanol and isopropanol)
・ Acrylic resin liquid (N-2043-60MEX, manufactured by Harima Chemicals Co., Ltd., non-volatile content: 60% by mass)
・ Silicone surfactant (BYK-UV3500, manufactured by BYK)
・ Acetylene glycol-based surfactant (E-1010, manufactured by Nissin Chemical Industry Co., Ltd.)

(Preparation Example 1)
-Preparation of urethane resin emulsion A-
Double the amount of polyester polyol (trade name: Polylite OD-X-2251, manufactured by DIC Corporation, average molecular weight 2,000) in a nitrogen-purged container equipped with a thermometer, a nitrogen gas inlet tube, and a stirrer. 200.4 g, 15.7 g of 2,2-dimethylolpropionic acid, 48.0 g of isophorone diisocyanate, 77.1 g of methyl ethyl ketone as an organic solvent, and 0.06 g of DMTDL (dibutyltin dilaurate) as a catalyst were reacted. After the reaction was continued for 4 hours, 30.7 g of methyl ethyl ketone was supplied as a dilution solvent, and the reaction was further continued. When the average molecular weight of the reaction product reached the range of 20,000 to 60,000, 1.4 g of methanol was added to terminate the reaction, thereby obtaining an organic solvent solution of urethane resin.
Next, 13.4 g of a 48% by mass potassium hydroxide aqueous solution was added to the organic solvent solution of the urethane resin to neutralize the carboxyl groups of the urethane resin, and then 715.3 g of water was added and sufficiently stirred. After that, the urethane resin emulsion A was obtained by aging and removing the solvent.
The minimum film-forming temperature (MFT) of the resulting urethane resin emulsion A measured with a film-forming temperature tester (manufactured by Imoto Seisakusho Co., Ltd.) was 74°C.

(Preparation Example 2)
-Preparation of Urethane Resin Emulsion B-
1,500 g of polycarbonate diol (reaction product of 1,6-hexanediol and dimethyl carbonate (number average molecular weight (Mn): 1,200)) was added to a reaction vessel equipped with a stirrer, a reflux condenser, and a thermometer. 220 g of 2-dimethylolpropionic acid (hereinafter sometimes referred to as "DMPA") and 1,347 g of N-methylpyrrolidone (hereinafter sometimes referred to as "NMP") were charged under a nitrogen stream and heated to 60°C. Heat was applied to dissolve the DMPA.
Next, 1,445 g of 4,4′-dicyclohexylmethane diisocyanate and 2.6 g of dibutyltin dilaurate (catalyst) are added and heated to 90° C. for urethanization reaction over 5 hours to produce an isocyanate-terminated urethane prepolymer. Obtained.
The resulting isocyanate-terminated urethane prepolymer was cooled to 80° C., 149 g of triethylamine was added, 4,340 g was extracted from the mixture, and placed in a mixed solution of 5,400 g of water and 15 g of triethylamine under strong stirring. added.
Next, 1,500 g of ice was added, and 626 g of a 35% by mass 2-methyl-1,5-pentanediamine aqueous solution was added to carry out a chain extension reaction, whereby a urethane resin emulsion B was obtained.
The obtained urethane resin emulsion B was measured with a film-forming temperature tester (manufactured by Imoto Seisakusho Co., Ltd.), and the lowest film-forming temperature was 55°C.

(Preparation Example 3)
-Preparation of acrylic resin emulsion A-
After the interior of a 1 L flask equipped with a mechanical stirrer, thermometer, nitrogen gas inlet tube, reflux tube, and dropping funnel was sufficiently replaced with nitrogen gas, 17.5 g of Latemul S-180 and 350 g of deionized water were added. The mixture was mixed with water and heated to 65°C. After raising the temperature, 3.0 g of t-butyl peroxobenzoate and 1.0 g of sodium isoascorbate as reaction initiators were added, and after 5 minutes, 45 g of methyl methacrylate, 160 g of 2-ethylhexyl methacrylate, 5 g of acrylic acid, 45 g of butyl methacrylate, 30 g of cyclohexyl methacrylate, 15 g of vinyltriethoxysilane, 8.0 g of Latemul S-180, and 340 g of deionized water were mixed and added dropwise over 3 hours. After that, the mixture was aged at 80° C. for 2 hours, cooled to room temperature, and adjusted to pH 7-8 with sodium hydroxide. Ethanol was distilled off using an evaporator, and water content was adjusted to prepare an acrylic resin emulsion A having a solid content of 40% by mass.
The minimum film-forming temperature (MFT) of the obtained acrylic resin emulsion A measured with a film-forming temperature tester (manufactured by Imoto Seisakusho Co., Ltd.) was 95°C.

(Preparation Example 4)
-Preparation of acrylic resin emulsion B-
900 parts by mass of ion-exchanged water and 1 part by mass of sodium lauryl sulfate were added to a reaction vessel equipped with a stirrer, a reflux condenser, a dropping device, and a thermometer, and the temperature was raised to 70°C while stirring and replacing with nitrogen. While maintaining the temperature in the reaction vessel at 70 ° C., 4 parts by mass of potassium persulfate as a polymerization initiator is added and dissolved, and after dissolution, 450 parts by mass of ion-exchanged water, 3 parts by mass of sodium lauryl sulfate, and 20 parts by mass of acrylamide. , 365 parts by mass of styrene, 545 parts by mass of butyl acrylate, and 10 parts by mass of methacrylic acid were added dropwise to the reaction solution continuously over 4 hours. After the dropwise addition was completed, the emulsion was held for 3 hours, and the resulting aqueous emulsion was cooled to room temperature. Then, ion-exchanged water and an aqueous sodium hydroxide solution were added to adjust the pH to 8 to obtain an acrylic resin emulsion B having a solid content of 30% by mass. Obtained.
The minimum film-forming temperature (MFT) of the obtained acrylic resin emulsion B measured with a film-forming temperature tester (manufactured by Imoto Seisakusho Co., Ltd.) was 85°C.

(Production example 4)
-Production of water-based ink A (black ink A)-
After premixing 3 parts by mass of black pigment (carbon black), 0.5 parts by mass of dispersant (Pionin A-51-B, manufactured by Takemoto Yushi Co., Ltd.), and 58.5 parts by mass of diethylene glycol diethyl ether, disc type The mixture was circulated and dispersed for 3 hours in a bead mill (manufactured by Shinmaru Enterprises Co., Ltd., model KDL, media: using zirconia balls with a diameter of 0.3 mm) to obtain a black pigment dispersion.

Next, 18.7 parts by mass of the obtained black pigment dispersion, 17.1 parts by mass of the urethane resin emulsion A, 20.6 parts by mass of urethane resin emulsion B, 2-amino-2-ethyl-1,3-propanediol ( AEPD) (manufactured by Tokyo Kasei Co., Ltd.) 0.3 parts by mass, glycerin 1.2 parts by mass, isoprene glycol 29.0 parts, silicone surfactant KF-643 (Shin-Etsu Chemical Co., Ltd.) 0.8 mass parts, 0.2 parts by mass of antifoaming agent Surfynol AD01 (manufactured by Nissin Chemical Industry Co., Ltd.), and high-purity water to make the total 100 parts by mass, and mixed and stirred to prepare a mixture. Water-based ink A (black ink A) was prepared by filtering the resulting mixture through a polypropylene filter having an average pore size of 0.2 μm (trade name: Betafine polypropylene pleated filter PPG series, manufactured by 3M).

(Production Examples 5-10)
-Production of water-based inks B to G (black inks B to G)-
Water-based inks B to G (black inks B to G) were prepared in the same manner as in Production Example 4, except that the compositions were changed to those shown in Tables 2 and 3.

(Example 1)
Non-aqueous clear ink A of Production Example 1 and water-based ink A (black ink A) of Production Example 4 are filled in an ink cartridge of a modified inkjet printer GXe5500 (manufactured by Ricoh Co., Ltd.), and the filled ink cartridge is used in an inkjet printer. Inkjet printing was carried out using water-based ink A (black ink A) by mounting it on a modified GXe5500 machine.
After that, inkjet printing was performed using the non-aqueous clear ink A. The modified inkjet printer GXe5500 was equipped with a heater (temperature control controller, model MTCD, manufactured by MISUMI Co., Ltd.) so that the back surface of the recording medium can be heated before, during, and after printing. As a result, it is possible to print on the recording medium heated by the heater before and during printing, and to heat and dry the printed matter by the heater after printing. Printing was carried out by changing the type of recording medium, heating conditions, and printed image in a high-gloss (glossy) print mode and a low-glossy (matte-gloss) print mode.

-recoding media-
In the high-gloss (glossy) print mode, synthetic paper VJFN160 (white polypropylene film, glossiness 16 (60° gloss value)) manufactured by Yupo Corporation was used as the recording medium 1 .
In the low gloss (matte gloss) print mode, a window film GIY-0305 (transparent polyethylene terephthalate (PET) film, glossiness 159 (60° gloss value)) manufactured by Lintec Sign Systems Co., Ltd. was used as the recording medium 2 .

- Color printing conditions -
In color printing, the heating temperature of each heater (heating means) placed before, during, and after printing is set to 45°C, 45°C, and 60°C, and the image resolution is 600dpi x 600dpi, and the printing rate is 100%. I printed a full image of

- Heating conditions for non-aqueous clear ink -
As for the heating conditions for the non-aqueous clear ink, in the high-gloss (glossy) print mode, the heating temperatures of the heaters (heating means) placed before, during, and after printing are set to 45°C, 45°C, and 60°C. , and in the low gloss (matte gloss) print mode, the heating temperatures of the heaters (heating means) arranged before, during, and after printing were set to 65°C, 65°C, and 70°C.
When measuring the temperature of the recording medium during printing, the recording medium temperature (T _gloss ) in the high-gloss print mode is 45° C., and the temperature of the heating means in the high-gloss print mode ( HT _gloss ) is 45°C. Further, when measuring the temperature of the recording medium during printing, the recording medium temperature (T _matte ) in the low-gloss print mode is 64°C, and the temperature (HT _matte ) of the heating means in the low-gloss print mode during printing is 65°C. is.
The temperature of the recording medium during printing was measured using a digital radiation temperature sensor (FT-H10, manufactured by KEYENCE CORPORATION). The image printed in the high gloss (glossy) print mode was a solid image with an image resolution of 600 dpi×600 dpi and a print rate of 100%.

-Print rate-
Note that the print rate here means the following.
Print rate (%) = number of clear ink print dots/(vertical resolution x horizontal resolution) x 100
(However, in the above formula, the "number of dots printed with clear ink" is the number of dots actually printed with clear ink per unit area, and the "vertical resolution" and "horizontal resolution" are the resolutions per unit area, respectively. When printing with clear ink overlaid so that the same dot position is printed, the "number of dots printed with clear ink" is the total number of dots actually printed with clear ink per unit area.)
The non-aqueous clear ink A was directly applied on the recording medium once so as to overlap the same dot position. Next, the glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed material were measured as follows. Table 4 shows the results.

<Glossiness>
The 60° gloss value of each of the clear ink printed area printed with non-aqueous clear ink A and the clear ink unprinted area (recording medium) not printed with non-aqueous clear ink A was measured using a glossiness measuring instrument (micro trigloss , manufactured by BYK). The 60° gloss value was defined as the glossiness. (Evaluation method) The glossiness difference between the clear ink printed area and the clear ink unprinted area (recording medium) was evaluated according to the following criteria. 〇 is the practical range.
(Evaluation criteria)
○: Glossiness difference 20 or more ×: Glossiness difference less than 20

<Scratch resistance>
Aqueous ink (black ink) and non-aqueous clear ink were printed on the surface of the material to be printed to form an image. After standing for one hour, the formed image was rubbed against a gold cloth using a Gakushin tester, and the image density (OD) transferred to the gold cloth was measured using xRite (manufactured by PANTONE) to evaluate weather resistance. The printing conditions were 600×600 dpi, the load was 200 gf, and the number of times of rubbing was 25 times. In the following evaluation criteria, △ or more is a practical range, and ○ is preferable.
(Evaluation criteria)
○: less than 0.15 △: 0.15 or more and less than 0.28 ×: 0.28 or more

<Weather resistance>
Aqueous ink (black ink) and non-aqueous clear ink were printed on the surface of the material to be printed to form an image. The formed image was placed on a weather meter (SX75) and exposed under the conditions of an output of 180 W/m ² , a total amount of received light of 324 MJ/m ² and an exposure time of 500 hours. Image density (OD) was measured before and after exposure, and OD change was evaluated according to the following criteria. 〇 is the practical range.
(Evaluation criteria)
○: Less than 0.1 ×: 0.1 or more

<Drying property>
Aqueous ink (black ink) and non-aqueous clear ink were printed on the surface of the material to be printed to form an image. Every 30 seconds after the image formation, the same printing material as the impermeable printing material cut into 2 cm square was pressed against the surface of the ink coating film. The pressing load was 103 g/cm ² and the pressing time was 10 seconds. The printed matter was peeled off from the ink coating film, and the time required for the transfer/peeling of the ink coating film to disappear was measured and evaluated according to the following criteria. In the following evaluation criteria, △ or more is a practical range, and ○ is preferable.
(Evaluation criteria)
○: Less than 7 minutes △: 7 minutes or more and less than 9 minutes ×: 9 minutes or more

(Example 2)
Inkjet printing was performed in the same manner as in Example 1, except that non-aqueous clear ink A was changed to non-aqueous clear ink B.
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 4 shows the results.

(Example 3)
Same as Example 1, except that non-aqueous clear ink A was changed to non-aqueous clear ink C, and water-based ink A (black ink A) was changed to water-based ink B (black ink B). Then, inkjet printing was performed.
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 4 shows the results.

(Example 4)
Inkjet printing was performed in the same manner as in Example 1, except that water-based ink A (black ink A) was changed to water-based ink D (black ink D).
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 4 shows the results.

(Example 5)
Inkjet printing was performed in the same manner as in Example 1, except that water-based ink A (black ink A) was changed to water-based ink E (black ink E).
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 4 shows the results.

(Comparative example 1)
Inkjet printing was performed in the same manner as in Example 1, except that water-based ink A (black ink A) was changed to water-based ink C (black ink C).
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 5 shows the results.

(Comparative example 2)
Inkjet printing was performed in the same manner as in Example 1, except that the non-aqueous clear ink was not used.
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 5 shows the results.

(Comparative Example 3)
Inkjet printing was performed in the same manner as in Example 1, except that water-based ink A (black ink A) was changed to water-based ink F (black ink F).
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 5 shows the results.

(Comparative Example 4)
Inkjet printing was performed in the same manner as in Example 1, except that water-based ink A (black ink A) was changed to water-based ink G (black ink G).
The glossiness, scratch resistance, weather resistance, and drying properties of the resulting printed matter were measured in the same manner as in Example 1. Table 5 shows the results.

As a result of comparing Example 1 and Comparative Example 2 in Tables 4 and 5, it was confirmed that the combination of non-aqueous clear ink and water-based ink improved the gloss ratio, scratch resistance, weather resistance, and drying property.
As a result of comparing Example 1 and Example 2 in Table 4, it was confirmed that the less the resin content in the non-aqueous clear ink, the better the drying property.
As a result of comparing Example 1 and Example 3 in Table 4, it was confirmed that Example 1 had improved scratch resistance.
As a result of comparing Example 1 and Comparative Example 1 in Tables 4 and 5, when the content of glycerin having a boiling point of 240 ° C. or higher is 3% by mass or less, glossiness, scratch resistance and drying properties are improved. was confirmed.

Embodiments of the present invention are, for example, as follows.
<1> an ink containing portion for containing ink;
an ejection head that ejects ink;
a heating means for heating the material to be printed;
An inkjet printing device comprising:
The inkjet printing device has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
When the heating means attaches the non-aqueous clear ink to the substrate, the temperature of the substrate in the low gloss printing area printed in the low gloss printing mode is T _matte (° C.), and the non-aqueous clear ink is applied to the substrate. Let T _gloss (° C.) be the temperature of the substrate in the high-gloss print area printed in the high-gloss print mode when adhering to the following formula: T _matte > T _gloss ,
The ink comprises a non-aqueous clear ink containing a resin and an organic solvent and an aqueous ink containing a resin, an organic solvent and water,
A content of the resin contained in the water-based ink is 10% by mass or more,
An inkjet printing apparatus, wherein the organic solvent contained in the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. is.
<2> The inkjet printing apparatus according to <1>, wherein the heating means heats so as to satisfy the following formula: T _matte −T _gloss ≧10° C.
<3> an ink containing portion for containing ink;
an ejection head that ejects ink;
a heating means for heating the material to be printed;
An inkjet printing device comprising:
The inkjet printing device has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
Assuming that the temperature of the heating means in the low-gloss print mode is HT _matte (°C) and the temperature of the heating means in the high-gloss print mode is HT _gloss (°C), the following equation is satisfied: HT _matte > HT _gloss heated as
The ink comprises a non-aqueous clear ink containing a resin and an organic solvent and an aqueous ink containing a resin, an organic solvent and water,
A content of the resin contained in the water-based ink is 10% by mass or more,
An inkjet printing apparatus, wherein the organic solvent contained in the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. is.
<4> When the glossiness of the printed material used in the low-gloss print mode is G _matte and the glossiness of the printed material used in the high-gloss print mode is G _gloss , the following formula, G _matte > G _gloss , is satisfied. The inkjet printing apparatus according to any one of <1> to <3>.
<5> Any one of <1> to <4>, wherein the organic solvent contained in the non-aqueous clear ink is at least one selected from an alkylene glycol diether compound, an alkylene glycol monoether compound, and a lactone compound. 3. It is an inkjet printing apparatus according to .
<6> The inkjet printing apparatus according to any one of <1> to <5>, wherein the content of the resin contained in the non-aqueous clear ink is 9% by mass or more.
<7> The inkjet printing apparatus according to <6>, wherein the content of the resin contained in the non-aqueous clear ink is 9% by mass or more and 20% by mass or less.
<8> The inkjet printing apparatus according to any one of <1> to <7>, wherein the non-aqueous clear ink further contains a surfactant, and the content of the surfactant is 2% by mass or more. .
<9> The inkjet printing apparatus according to any one of <1> to <8>, wherein the water-based ink has a viscosity of 6.5 mPa·s or more at 40°C.
<10> The above <1>, wherein the organic solvent contained in the water-based ink contains an organic solvent having a boiling point of 270° C. or higher, and the content of the organic solvent having a boiling point of 270° C. or higher is 1% by mass or more and 3% by mass or less. The inkjet printing apparatus according to any one of <9> to <9>.
<11> A step of applying a water-based ink containing 10% by mass or more of a resin, 1% by mass or more and 3% by mass or less of an organic solvent having a boiling point of 240° C. or more, and water to a substrate to print an image;
A step of applying a non-aqueous clear ink containing a resin and an organic solvent to a material to be printed;
a heating step of heating the printed material with heating means;
Having a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
In the heating step, when the non-aqueous clear ink is applied to the printed material, the temperature of the printed material in the low gloss printing area printed in the low gloss printing mode is T _matte (° C.), and the non-aqueous clear ink is applied to the printed material. Assuming that the temperature of the printed material in the high-gloss print area printed in the high-gloss print mode when attached to the printed material is T _gloss (° C.), the following formula: T _matte > T _gloss Inkjet printing method in which heating is performed so as to satisfy is.
<12> A step of applying a water-based ink containing 10% by mass or more of a resin, 1% by mass or more and 3% by mass or less of an organic solvent having a boiling point of 240° C. or more, and water to a substrate to form a printing layer;
A step of applying a non-aqueous clear ink containing a resin and an organic solvent to a material to be printed;
a heating step of heating the printed material with heating means;
Having a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
In the heating step, the temperature of the heating means in the low gloss printing mode when the non-aqueous clear ink is attached to the printing material is HT _matte (° C.), and the temperature of the heating means in the high gloss printing mode is HT. This is an inkjet printing method in which heating is performed so as to satisfy the following formula, HT _matte >HT _gloss , where _gloss (° C.) is assumed.

According to the inkjet printing apparatus according to any one of <1> to <10> and the inkjet printing method according to any one of <11> to <12>, various problems in the past are solved, and the present invention is achieved. can achieve its purpose.

400 Image forming apparatus 401 Exterior 401c Cover 404 Cartridge holder 410, 410k, 410c, 410m, 410y Main tank 411 Ink container 413 Ink outlet 414 Container case 420 Mechanism 434 Ejection head 436 Supply tube L Ink container

JP 2015-3397 A

Claims (10)

an ink containing portion that contains ink;
an ejection head that ejects ink;
a heating means for heating the material to be printed;
An inkjet printing device comprising:
The inkjet printing device has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
When the heating means attaches the non-aqueous clear ink to the substrate, the temperature of the substrate in the low gloss printing area printed in the low gloss printing mode is T _matte (° C.), and the non-aqueous clear ink is applied to the substrate. Let T _gloss (° C.) be the temperature of the substrate in the high-gloss print area printed in the high-gloss print mode when adhering to the following formula: T _matte > T _gloss ,
The ink comprises a non-aqueous clear ink containing a resin and an organic solvent and an aqueous ink containing a resin, an organic solvent and water,
A content of the resin contained in the water-based ink is 10% by mass or more,
An inkjet printing apparatus, wherein the organic solvent contained in the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. . The inkjet printing apparatus according to claim 1, wherein the heating means performs heating so as to satisfy the following formula: T _matte - T _gloss ≥ 10°C. an ink containing portion that contains ink;
an ejection head that ejects ink;
a heating means for heating the material to be printed;
An inkjet printing device comprising:
The inkjet printing device has a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
Assuming that the temperature of the heating means in the low-gloss print mode is HT _matte (°C) and the temperature of the heating means in the high-gloss print mode is HT _gloss (°C), the following equation is satisfied: HT _matte > HT _gloss heated as
The ink comprises a non-aqueous clear ink containing a resin and an organic solvent and an aqueous ink containing a resin, an organic solvent and water,
A content of the resin contained in the water-based ink is 10% by mass or more,
An inkjet printing apparatus, wherein the organic solvent contained in the water-based ink contains an organic solvent having a boiling point of 240° C. or higher, and the content of the organic solvent having a boiling point of 240° C. or higher is 1% by mass or more and 3% by mass or less. . Let G _matte be the glossiness of the _substrate used in the low-gloss print mode, _and let G _gloss be the glossiness of the substrate used in the high-gloss print mode. 4. The inkjet printing device according to any one of 3 to 3. The inkjet printing according to any one of claims 1 to 4, wherein the organic solvent contained in the non-aqueous clear ink is at least one selected from an alkylene glycol diether compound, an alkylene glycol monoether compound, and a lactone compound. Device. The inkjet printing apparatus according to any one of claims 1 to 5, wherein the content of the resin contained in the non-aqueous clear ink is 9% by mass or more. The inkjet printing apparatus according to any one of claims 1 to 6, wherein the non-aqueous clear ink further contains a surfactant, and the content of the surfactant is 2% by mass or more. The inkjet printing apparatus according to any one of claims 1 to 7, wherein the water-based ink has a viscosity at 40°C of 6.5 mPa·s or more and 30 mPa·s or less. A step of applying a water-based ink containing 10% by mass or more of a resin, 1% to 3% by mass of an organic solvent having a boiling point of 240° C. or more, and water to a substrate to form a printing layer;
A step of applying a non-aqueous clear ink containing a resin and an organic solvent to a material to be printed;
a heating step of heating the printed material with heating means;
Having a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
In the heating step, when the non-aqueous clear ink is applied to the printed material, the temperature of the printed material in the low gloss printing area printed in the low gloss printing mode is T _matte (° C.), and the non-aqueous clear ink is applied to the printed material. Assuming that the temperature of the printed material in the high-gloss print area printed in the high-gloss print mode when attached to the printed material is T _gloss (° C.), the following formula: T _matte > T _gloss Inkjet printing method in which heating is performed so as to satisfy . A step of applying a water-based ink containing 10% by mass or more of a resin, 1% to 3% by mass of an organic solvent having a boiling point of 240° C. or more, and water to a substrate to form a printing layer;
A step of applying a non-aqueous clear ink containing a resin and an organic solvent to a material to be printed;
a heating step of heating the printed material with heating means;
Having a low gloss print mode that is a print mode that imparts low gloss and a high gloss print mode that is a print mode that imparts high gloss,
In the heating step, the temperature of the heating means in the low gloss printing mode when the non-aqueous clear ink is attached to the printing material is HT _matte (° C.), and the temperature of the heating means in the high gloss printing mode is HT. An inkjet printing method in which heating is performed so as to satisfy the following formula, HT _matte >HT _gloss , where _gloss (° C.) is assumed.

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