JP2022177398A - recording device - Google Patents

Abstract

Kind Code: A1 To provide a recording apparatus which does not curl on thin paper and has excellent drying properties on thick paper.
The ink contains a colorant, an organic solvent and water and contains 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less, and the ink is applied to a recording medium. Ejecting means 3 for ejecting, conveying means 1, 2 and 7 for conveying the recording medium, heating means 4 for irradiating and heating the recording medium to which the ink has been applied, and air in the housing is exhausted. and exhausting means 6, wherein when the steam generated by heating by the heating means is exhausted from the exhausting means, the steam generated by heating comes into contact with the recording medium before being heated. It is characterized by the generation of air currents.
[Selection drawing] Fig. 1

Description

The present invention relates to recording apparatuses.

Inkjet printers have advantages such as low noise, low running costs, and easy color printing, and are widely used as digital signal output devices. BACKGROUND ART Absorbent media such as plain paper, low-absorbent recording media such as coated paper, and non-absorbent recording media such as plastic films are used as printing materials used in inkjet printers. In recent years, particularly in the field of commercial printing, there has been a demand for faster printing, and inks and devices capable of drying in a shorter time have been developed.

In Patent Document 1, a pigment, a pigment dispersion resin, an organic solvent, and water are contained. and an organic solvent having a temperature of 280° C. or more and a surface tension of 20 mN/m or more and 30 mN/m or less. According to Patent Document 1, it is possible to obtain high-quality images with excellent printability on general printing substrates, especially substrates with high glossiness such as coated paper, art paper, and vinyl chloride sheets. there is

In Patent Document 2, a light irradiation unit for irradiating a moving recording medium with light to evaporate water droplets adhering to the recording medium, and a light irradiation unit located downstream of the light irradiation unit in the direction of movement of the recording medium. A discharge port that discharges air supplied to the medium and has a downstream end on the downstream side in the direction of movement of the recording medium, and a portion of the recording medium located upstream of the downstream end A drying apparatus is disclosed that includes a heating section that heats. According to Japanese Patent Application Laid-Open No. 2002-200012, it is possible to suppress the decrease in the temperature of the recording medium due to the supply of air to the recording medium, compared to the case where the heating unit for heating the recording medium is not provided.

However, in Patent Document 1, although it is expected that curl resistance is improved by containing an organic solvent having a boiling point of 200° C. or more and 280° C. or less, drying performance may be insufficient depending on the drying process. In addition, it is difficult to obtain good drying properties for cardboard.
In Japanese Patent Laid-Open No. 2004-100000, it seems that the steam generated by heating contacts the recording medium, thereby suppressing curling such as wrinkling of the paper due to heating. However, in Japanese Unexamined Patent Application Publication No. 2002-100001, the light irradiation portion and the discharge port are on the same side with respect to the recording medium, so this cannot sufficiently absorb moisture. For this reason, it is considered that the vapor generated by heating only strokes the surface of the recording medium, and moisture absorption to the recording medium is insufficient in order to increase the heating efficiency by light irradiation.
In the prior art, if an attempt is made to improve the drying property of thick paper, thin paper tends to curl, while if an attempt is made to prevent curling of thin paper, thick paper cannot be sufficiently dried.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a recording apparatus which does not curl on thin paper and which is excellent in drying properties on thick paper.

In order to solve the above problems, the recording apparatus of the present invention contains a coloring material, an organic solvent, and water, and contains 3.0% by mass or more and 15.0% by mass of an organic solvent having a boiling point of 210° C. or more and 280° C. or less in the ink. an ink including the following, an ejecting means for ejecting the ink onto a recording medium, a transporting means for transporting the recording medium, a heating means for heating the recording medium to which the ink has been applied by irradiating light, and a casing. and an exhaust means for exhausting the air from the heating means, and when the steam generated by heating by the heating means is exhausted from the exhaust means, the heated vapor contacts the recording medium before being heated. It is characterized by generating an airflow that

According to the present invention, it is possible to provide a recording apparatus which does not curl on thin paper and which is excellent in drying properties on thick paper.

1 is a schematic diagram showing an example of a recording apparatus according to the present invention; FIG. FIG. 3 is a schematic diagram for schematically explaining an example of airflow;

A recording apparatus according to the present invention will be described below with reference to the drawings. In addition, the present invention is not limited to the embodiments shown below, and can be changed within the scope of those skilled in the art, such as other embodiments, additions, modifications, deletions, etc. is also included in the scope of the present invention as long as the functions and effects of the present invention are exhibited.

The recording apparatus of the present invention comprises an ink containing a coloring material, an organic solvent, and water and containing 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less, and the ink. Ejecting means for ejecting ink onto a recording medium, transporting means for transporting the recording medium, heating means for irradiating and heating the recording medium to which the ink has been applied, and exhaust means for evacuating air from a housing. wherein, when the vapor generated by heating by the heating means is exhausted from the exhausting means, an air current is generated such that the vapor generated by heating comes into contact with the recording medium before being heated. Characterized by
The recording apparatus of the present invention may also be called an image forming apparatus, an inkjet recording apparatus, an inkjet printer, a modeling apparatus, or the like.

An embodiment of a recording apparatus will be described with reference to FIG. FIG. 1 is a schematic diagram of a main part of a printing apparatus according to this embodiment.

The conveying means in this embodiment has, for example, a paper feeding device 1, a winding device 2, and rollers 7. As shown in FIG. A recording medium (continuous paper P) is conveyed between the paper feeding device 1 and the winding device 2, comes into contact with a roller 7 as a conveying member, and is conveyed in the direction of the arrow. Only one roller 7 is given a reference numeral, and the reference numerals for the other rollers are omitted. Also, the configuration of the rollers 7 is not limited to the illustrated one, and can be changed as appropriate, for example, the number, arrangement, etc. can be changed as appropriate.

The inkjet head 3 is an example of ejection means, and ejects ink onto a recording medium. The ink to be ejected, the configuration of the inkjet head, and the like can be appropriately selected. The illustrated example has, for example, four inkjet heads, each of which ejects different color inks (KCMY).

The IR heater 4 is an example of heating means, and irradiates the recording medium on which ink has been ejected with light. Water-based ink can be satisfactorily dried by applying light and heating. The light is preferably IR light, which is in the wavelength range absorbed by water. In this case, the drying can be done quickly.

The exhaust means exhausts the air inside the housing. The exhaust means in this embodiment includes, for example, an exhaust duct 6 and a fan. The exhaust duct 6 has a suction port for sucking the air inside the housing, a discharge port for discharging the air, and the like.

According to the recording apparatus of the present embodiment, when the vapor generated by heating by the heating means is exhausted from the exhausting means, an air current is generated such that the vapor generated by heating contacts the recording medium before being heated. occur. In the present embodiment, high-humidity air generated from the image during heating by the IR heater 4 is sucked by the exhaust duct 6, so that the recording medium before heating and being conveyed can absorb the vapor. Then, the recording medium that has absorbed the vapor is conveyed to the heating position of the IR heater 4 and heated by the IR heater 4, whereby the absorbed moisture generates heat by itself, and the recording medium can be thoroughly dried from the inside. Therefore, even if the recording medium is thick paper, the drying property can be improved by causing the recording medium to absorb the steam.

On the other hand, when the recording medium is thin paper, there is a problem that the moisture in the paper is blown off by heating, and curling occurs. Therefore, the inventors of the present invention conducted extensive research and found that it was necessary to adopt an organic solvent having a curl-suppressing effect as an ink component. As a result of further investigation, the inventors have found that curling can be suppressed by using an ink containing 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less. . When such an ink is used, the affinity between the organic solvent molecules can be lowered, and the permeability to the recording medium can be increased. In addition, it is thought that curling is suppressed because the organic solvent permeates into the recording medium to the extent that the moisture content of the paper is lost. Therefore, according to the present embodiment, by using such a recording apparatus and ink, it is possible to provide a recording apparatus that does not curl on thin paper and has excellent drying properties on thick paper.

The hot air device 5 is an example of a hot air blower, and blows warm air to the recording medium onto which ink has been ejected. In the present embodiment, in the conveying direction of the recording medium, the ejecting means, the exhausting means, the heating means, and the warm air blowing means are arranged in this order from the upstream side. By arranging in this manner, particularly by arranging the warm air blowing means downstream of the heating means, the steam generated by being heated by the heating means is heated to contact the recording medium before being heated. In contrast, it is possible to suppress the hot air from obstructing.

The arrangement of the IR heater 4 and the exhaust duct 6 can be changed as appropriate. It is preferable that a path along which the recording medium is conveyed before reaching the IR heater 4 exists between the IR heater 4 and the suction port of the exhaust duct 6 . In this case, the steam heated by the IR heater 4 can more reliably pass through the recording medium, making it easier for the recording medium to absorb moisture.
It should be noted that the space between the IR heater 4 and the suction port of the exhaust duct 6 can also be referred to as a straight line connecting the IR heater 4 and the exhaust duct 6, and the transport path of the recording medium lies on such a straight line. Consider whether it exists.

In this embodiment, it is possible to determine, for example, in the following manner whether or not there is an airflow that causes the vapor generated by heating by the heating means to come into contact with the recording medium before being heated. For example, it is necessary to consider the relationship between the position of the heating means where the light is irradiated, the position where the light is irradiated on the recording medium, the position of the suction port for sucking air in the exhaust means, and the conveying route of the recording medium. can be done. In addition, it can be actually measured by an anemometer such as Anemo Master Light Model 6006-D0 manufactured by KANOMAX.

FIG. 2 is a diagram for schematically explaining an example of an air flow in the printing apparatus of this embodiment. Note that descriptions of items similar to those described above will be omitted.

In this example, the IR heater 4 irradiates the recording medium with IR light 4a in the illustrated direction. However, the irradiation direction, irradiation area, and the like of the IR light 4a can be changed as appropriate, and are not limited to this example.

Arrows A1 to A3 (also referred to as airflows A1 to A3, etc.) schematically indicate airflows generated when steam generated by being heated by the IR heater 4 is sucked into the exhaust duct 6. FIG. Air sucked from the suction port 6a of the exhaust duct 6 passes through the exhaust duct 6 and is discharged (also referred to as exhaust) from the discharge port 6b. Arrows B schematically indicate an example of the flow of discharged air.

In this example, for example, the airflow A1 and the airflow A3 are airflows that contact the recording medium before the vapor generated by heating is heated. By generating such an airflow, the above effects can be obtained.

A dashed circle C in the figure roughly indicates the region where such a path exists, regarding the path along which the recording medium is conveyed before reaching the IR heater 4 between the IR heater 4 and the suction port of the exhaust duct 6. is shown in The presence of such a route provides the above-described effects.

The hot air device 5 in this example blows hot air in the illustrated direction downstream of the IR heater 4 to dry the recording medium. By drying in this manner, it is possible to prevent the hot air from interfering with the air flow in which the vapor generated by heating contacts the recording medium.

Note that the recording apparatus of the present invention may be used as a three-dimensional modeling apparatus. The three-dimensional modeling apparatus for modeling a three-dimensional object in the present invention can adopt a known configuration, and is not particularly limited, but includes, for example, ink storage means, supply means, ejection means, drying means, etc. can be used. 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. Molded processed products are, for example, products obtained by subjecting recorded matter or structures formed in the form of sheets or films to molding processes such as heat stretching and punching. It is suitable for use in applications where the surface is molded after decoration, such as electronic devices, meters of cameras, etc., and operation panel panels.

(ink)
Organic solvents, water, coloring materials, resins, additives, and the like used in the ink are described below.
The ink used in the present invention contains a coloring material, an organic solvent and water, and optionally other components.

<Organic solvent>
The organic solvent used in the present invention is not particularly limited, and any 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 described above, in the present invention, the ink contains 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less. As a result, the drying properties of thick paper and the curling resistance of thin paper can be improved. If the amount of the organic solvent is less than 3.0% by mass, the curling resistance of thin paper is deteriorated, and if it exceeds 15.0% by mass, the drying property of thick paper is deteriorated.

In addition, from the viewpoint of improving curl resistance on thin paper, the ink preferably contains 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 240° C. or more and 280° C. or less.

Moreover, from the viewpoint of improving the curling resistance of thin paper, it is more preferable that the organic solvent contains diethanolamine. Although the reason is not clear, it is presumed that diethanolamine has better penetrability into the recording medium than other solvents because the curling resistance is improved. The content of diethanolamine is preferably 10% by mass or more and preferably 45% by mass or less with respect to the total organic solvent.

<Water>
The content of water in the ink is not particularly limited and can be appropriately selected according to the purpose. % or more and 80 mass % or less is more preferable.

<Color material>
The coloring material is not particularly limited, and 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 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.
As inorganic pigments, in addition to titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, and chrome yellow, carbon black produced by known methods such as contact method, furnace method, thermal method, etc. can be used.
Organic pigments include azo pigments, polycyclic pigments (e.g., phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, 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.

Specific examples of pigments for black include carbon blacks (C.I. Pigment Black 7) such as furnace black, lamp black, acetylene black and channel black, or copper and iron (C.I. Pigment Black 11). , metals such as 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, 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, etc.
As dyes, acid dyes, direct dyes, reactive dyes, and basic dyes can be used without particular limitation, and may be used singly or in combination of two or more.

As a dye, for example, 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. and Reactive Black 3,4,35.

The content of the coloring material in the ink is preferably 0.1% by mass or more and 15% by mass or less, more preferably 1% by mass or more and 10% by mass, from the viewpoints of improving image density, good fixability, and ejection stability. It is below.

As a method of dispersing the pigment to obtain an ink, 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 the pigment, and a method of dispersing the pigment using a dispersant. method, etc.
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.

<Resin>
The type of resin contained in the ink is not particularly limited and can be appropriately selected according to the purpose. resins, styrene-butadiene-based resins, vinyl chloride-based resins, acrylic-styrene-based resins, acrylic-silicone-based resins, and the like.
Resin particles made of these resins may also be used. Ink can be obtained by mixing resin particles in a resin emulsion state 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 volume average particle diameter of the resin particles is not particularly limited and can be appropriately selected according to the intended purpose. 200 nm or less is more preferable, and 10 nm or more and 100 nm or less is particularly preferable.

The volume average particle diameter can be measured, for example, using a particle size analyzer (Nanotrack Wave-UT151, manufactured by Microtrack Bell Co., Ltd.).
The content of the resin is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of fixability and storage stability of the ink, the content is 1% by mass or more and 30% by mass or less based on the total amount of the ink. is preferable, and 5% by mass or more and 20% by mass or less is more preferable.

The particle size of the solid content in the ink is not particularly limited, and can be appropriately selected according to the purpose. From the viewpoint of enhancing image quality such as ejection stability and image density, the maximum frequency of the particle size of the solid content in the ink is preferably 20 nm or more and 1000 nm or less, more preferably 20 nm or more and 150 nm or less, in terms of the maximum number. The solid content includes resin particles, pigment particles, and the like. The particle size can be measured using a particle size analyzer (Nanotrack Wave-UT151, manufactured by Microtrack Bell Co., Ltd.).

<Additive>
Surfactants, antifoaming agents, antiseptic antifungal agents, anticorrosive agents, pH adjusters, etc. may be added to the ink as necessary.

<Surfactant>
Any of silicone surfactants, fluorine surfactants, amphoteric surfactants, nonionic surfactants, and anionic surfactants can be used as surfactants.
The silicone-based surfactant is not particularly limited and can be appropriately selected depending on the purpose. Among them, those that do not decompose even at high pH are preferred. Examples of silicone-based surfactants include side chain-modified polydimethylsiloxane, both-end-modified polydimethylsiloxane, single-end-modified polydimethylsiloxane, and side-chain both-end-modified polydimethylsiloxane. Those having a polyoxyethylene group or a polyoxyethylene-polyoxypropylene group as a modifying group are particularly preferred because they exhibit good properties as water-based surfactants. As the silicone-based surfactant, a polyether-modified silicone-based surfactant can also 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.

Examples of fluorine-based surfactants include perfluoroalkylsulfonic acid compounds, perfluoroalkylcarboxylic acid compounds, perfluoroalkylphosphoric acid ester compounds, perfluoroalkylethylene oxide adducts, and perfluoroalkyl ether groups in side chains. Polyoxyalkylene ether polymer compounds are particularly preferred due to their low foaming properties. Examples of perfluoroalkylsulfonic acid compounds include perfluoroalkylsulfonic acids, perfluoroalkylsulfonates, and the like. Examples of perfluoroalkylcarboxylic acid compounds include perfluoroalkylcarboxylic acids and perfluoroalkylcarboxylic acid salts. Examples of polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in side chains include sulfuric acid ester salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in side chains, and polyoxyalkylene ether polymers having perfluoroalkyl ether groups in side chains. Examples thereof include salts of oxyalkylene ether polymers. Counter ions _of salts _in these fluorosurfactants include Li, Na, _K , _NH4 , _NH3CH2CH2OH , _NH2 ( _CH2CH2OH ) _{2 ,} and NH( _CH2CH2OH ). ₃ and the like.
Examples of amphoteric surfactants include laurylaminopropionate, lauryldimethylbetaine, stearyldimethylbetaine, lauryldihydroxyethylbetaine and the like.
Nonionic surfactants include, for example, polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan Examples include fatty acid esters and ethylene oxide adducts of acetylene alcohol.
Examples of anionic surfactants include polyoxyethylene alkyl ether acetates, dodecylbenzene sulfonates, laurates, and salts of polyoxyethylene alkyl ether sulfates.
These may be used individually by 1 type, or may use 2 or more types together.
The silicone-based surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. Examples include polydimethylsiloxane modified at both ends, and polyether-modified silicone surfactants having polyoxyethylene groups or polyoxyethylene polyoxypropylene groups as modifying groups are particularly preferred because they exhibit good properties as water-based surfactants. .

As such a surfactant, an appropriately synthesized one may be used, or a commercially available product may be used. Commercially available products are available from, for example, BYK Chemie Co., Ltd., Shin-Etsu Chemical Co., Ltd., Dow Corning Toray Silicone Co., Ltd., Nihon Emulsion Co., Ltd., Kyoeisha Chemical Co., Ltd., and the like.
The above 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 siloxane.

(However, in 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.)

Commercially available products can be used as the above polyether-modified silicone-based surfactants. 1906EX (Japan Emulsion Co., Ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, FZ-2164 (Dow Corning Toray Silicone Co., Ltd.), BYK-33, BYK-387 (BYK-Chemie Corporation), TSF4440, TSF4452, TSF4453 (Toshiba Silicon Co., Ltd.) and the like.
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 fluorine-based surfactants include perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in side chains. Among these, a polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in a side chain is preferable because of its low foamability, and in particular, fluorine-based compounds represented by general formulas (F-1) and (F-2) Surfactants are preferred.

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

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;

Commercially available products may be used as the fluorosurfactant. Examples of commercially available products include Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, and 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 (both manufactured by Sumitomo 3M); Megafac F-470, F -1405, F-474 (both manufactured by Dainippon Ink and Chemicals); 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 (manufactured by Omnova), Unidyne DSN-403N (manufactured by Daikin Industries, Ltd.) Among these, Chemours FS-3100, FS-34, FS- 300, FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW manufactured by Neos Co., Ltd., Polyfox PF-151N manufactured by Omnova Co., Ltd., and Unidyne DSN- manufactured by Daikin Industries, Ltd. 403N is particularly preferred.

The content of the surfactant in the ink is not particularly limited and can be appropriately selected according to the purpose. % or more and 5 mass % or less is preferable, and 0.05 mass % or more and 5 mass % or less is more preferable.

<Antifoaming agent>
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.

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

<Antirust agent>
The rust inhibitor is not particularly limited, and examples thereof include acidic sulfites and sodium thiosulfate.

<pH adjuster>
The pH adjuster 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 ink are not particularly limited and can be appropriately selected depending on the intended purpose. For example, viscosity, surface tension, pH and the like are preferably within the following ranges.

<Physical properties of ink>
The viscosity of the ink at 25° C. is preferably 3 mPa·s or more and 30 mPa·s or less, and more preferably 5 mPa·s or more and 25 mPa·s or less, in order to improve print density and character quality and to obtain good ejection properties. more preferred. Here, the viscosity can be measured using, for example, a rotational viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.). Measurement conditions are 25° C., standard cone rotor (1°34′×R24), sample liquid volume 1.2 mL, rotation speed 50 rpm, 3 minutes.
The surface tension of the ink is preferably 35 mN/m or less, more preferably 32 mN/m or less at 25° C., from the viewpoint that the ink is appropriately leveled on the recording medium and the drying time of the ink is shortened.
The pH of the ink is preferably from 7 to 12, more preferably from 8 to 11, from the viewpoint of preventing corrosion of metal members in contact with the liquid.

<Recording medium>
The recording medium is not particularly limited, and hygroscopic materials such as plain paper, glossy paper, special paper, and cloth can be used.
The recording medium is not limited to those used as general recording media, and wallpaper, floor materials, building materials such as tiles, cloth for clothing such as T-shirts, textiles, leather, and the like can be used as appropriate. Ceramics, glass, metal, etc. can also be used by adjusting the configuration of the path for conveying the recording medium.
In addition, not only continuous paper but also cut paper can be freely selected.

The distinction between thin paper and thick paper can be appropriately selected, for example, by basis weight (gsm).

<Records>
The ink recorded matter of the present invention has an image formed on a recording medium using the ink of the present invention.
A recorded matter can be obtained by recording with an inkjet recording apparatus and an inkjet recording method.

<How to use ink>
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 of the present invention 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).

Image formation, recording, printing, printing, etc. in the terms of the present invention are all synonymous. The terms recording medium, medium, and printed material are all synonymous.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Examples 1 to 63, Comparative Examples 1 to 25)
<Preparation of pigment dispersion>
The following commercially available products were used as pigment dispersions.
・CAB-O-JET 400 (manufactured by Cabot)
・CAB-O-JET 450C (manufactured by Cabot)
・CAB-O-JET 465M (manufactured by Cabot)
・CAB-O-JET 480M (manufactured by Cabot)
・CAB-O-JET 470Y (manufactured by Cabot)

<Preparation of resin emulsion>
As the resin emulsion, the following commercially available products were used.
・Takelac W5661 (manufactured by Mitsui Chemicals)
・Neocryl BT-9 (manufactured by DSM Coating Resins)
・Lube190 (manufactured by MICHELMAN)

<Preparation of organic solvent>
As the organic solvent, the commercially available products shown below were used.
・ Glycerin (manufactured by Tokyo Chemical Industry, boiling point 290 ° C.)
・Trimethylolpropane (manufactured by Tokyo Chemical Industry, boiling point 287°C)
・ Triethylene glycol (manufactured by Tokyo Chemical Industry, boiling point 287 ° C.)
・ N-butyldiethanolamine (manufactured by Tokyo Chemical Industry, boiling point 275 ° C.)
・ 3-methyl-1,5-pentanediol (manufactured by Tokyo Chemical Industry, boiling point 250 ° C.)
・ Diethylene glycol (manufactured by Tokyo Chemical Industry, boiling point 240 ° C.)
・ 3-ethyl-3-hydroxymethyloxetane (manufactured by Tokyo Chemical Industry, boiling point 227 ° C.)
・ 1,2-hexanediol (manufactured by Tokyo Chemical Industry, boiling point 223 ° C.)
・ 1,3-propanediol (manufactured by Tokyo Chemical Industry, boiling point 214 ° C.)

<Preparation of surfactant>
As the surfactant, the following commercially available products were used.
・SAG-503A (manufactured by Nissin Chemical Industry)
・ FS-300 (manufactured by DuPont)
・ Olefin E1004 (manufactured by Nissin Chemical Industry)
・ Olefin E1010 (manufactured by Nissin Chemical Industry)

<Preparation of antiseptic>
As the antiseptic, the following commercially available products were used.
・Proxel LV (manufactured by Lonza Japan)

<Preparing recording media>
The following commercial products were used.
・ Snowbrite (manufactured by Tiwn Rivers, basis weight 40 gsm)
・NPi form NEXT-IJ 70 (manufactured by Nippon Paper Industries, basis weight 81.4 gsm)
・NPi form NEXT-IJ 135 (manufactured by Nippon Paper Industries, basis weight 157 gsm)
・Crown Letsgo Silk (manufactured by Crown van Gelder, basis weight 250 gsm)

<Ink preparation example>
After preparing each material based on the ink formulation shown in Tables 1 to 11 below, they were mixed and stirred, filtered through a filter with an average pore size of 5 μm (manufactured by Sartorius, Minizart), and filtered through a 0.5 μm polypropylene filter. Ink was made. The unit of numerical values for various materials in Tables 1 to 11 is "% by mass". In Tables 1 to 11, the numerical values indicating the content of the pigment dispersion and the resin all represent the solid content. Also, "COJ" stands for "CAB-O-JET".

(evaluation)
Next, in each example and each comparative example, dryness and curl resistance were evaluated based on the following methods. Evaluation results are shown in Tables 1 to 11 below.

<Drying property>
Using the prepared ink, a solid image was formed with a resolution of 600 dpi×600 dpi using the apparatus shown in FIG. Within 2 minutes after printing, the solid image is rubbed 20 times with the blank part of the recording medium cut into 1.2 cm square, and the ink transfer stains on the blank part of the coated paper are measured with a reflective color spectrophotometric densitometer (X-Rite). company). The transfer density was obtained by subtracting the background color of the rubbed white paper, and the dryness was evaluated based on the following evaluation criteria. Note that AA and A are the allowable range.

[Evaluation criteria]
AA: Transfer density is less than 0.01 A: Transfer density is 0.01 or more and less than 0.03 B: Transfer density is 0.03 or more and less than 0.10 C: Transfer density is 0.10 or more

<Curl resistance>
A solid image was formed with the prepared ink at a resolution of 600 dpi×600 dpi using the apparatus shown in FIG. Within 2 minutes after printing, a piece of A4 size was cut out and placed on a flat surface with the printed surface facing down. Note that AA and A are the allowable range.

[Evaluation criteria]
AA: Less than 5 mm A: 5 mm or more and less than 10 mm B: 10 mm or more and less than 20 mm C: 20 mm or more

From Examples 1 to 63, when the ink contains 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less, the curl resistance of thin paper and the drying property of thick paper are compatible. I understand.
Further, by comparing Examples 1 to 30, 34 to 36, 40 to 51 with Examples 31 to 33, 37 to 39, and 52 to 63, it was found that an organic solvent having a boiling point of 240° C. or more and 280° C. or less was used in the ink. It can be seen that when the content is 0% by mass or more and 15.0% by mass or less, the curl resistance of the thin paper is improved.
A comparison between Example 1 and Examples 29 and 30 shows that the curl resistance is better when the organic solvent contains diethanolamine.
From the comparison between Example 1 and Comparative Examples 1 to 25, when the ink does not contain 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210 ° C. or more and 280 ° C. or less, drying of cardboard It can be seen that the properties and the curl resistance of thin paper are not compatible.

1 Paper feeding device 2 Winding device 3 Inkjet head 4 IR heater 5 Warm air device 6 Exhaust duct P Continuous paper

JP 2014-205769 A JP 2019-162796 A

Claims (5)

an ink containing 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 210° C. or more and 280° C. or less;
ejection means for ejecting the ink onto a recording medium;
a conveying means for conveying the recording medium;
a heating means for heating the recording medium to which the ink has been applied by irradiating light;
an exhaust means for exhausting the air in the housing,
A recording apparatus characterized in that, when the vapor generated by heating by the heating means is exhausted from the exhausting means, an air current is generated such that the vapor generated by heating contacts the recording medium before being heated. . 2. A recording apparatus according to claim 1, wherein said ink contains 3.0% by mass or more and 15.0% by mass or less of an organic solvent having a boiling point of 240[deg.] C. or more and 280[deg.] C. or less. 3. A recording apparatus according to claim 1, wherein said organic solvent contains diethanolamine. The exhaust means has a suction port for sucking air in the housing,
4. A recording apparatus according to claim 1, wherein a path along which said recording medium is conveyed before reaching said heating means is provided between said heating means and said suction port. Having a hot air blowing means for blowing warm air to the recording medium,
5. The apparatus according to any one of claims 1 to 4, wherein the ejection means, the exhaust means, the heating means, and the hot air blowing means are arranged in this order from the upstream side in the conveying direction of the recording medium. recording device.

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