JP7574628B2 - Recording device and recording method - Google Patents

Description

The present invention relates to a recording device and a recording method.

Inkjet printers that use the inkjet recording method are rapidly becoming popular because they are small, inexpensive, and easy to produce in color. In recent years, there has been a demand for high-quality ink recordings to be made at high speeds, and in order to meet this demand, the inks used in the inkjet recording method must satisfy a variety of characteristics.

Traditionally, dye inks have been widely used, but they have issues with weather resistance and the image density on plain paper is insufficient. As a result, pigment inks have come to be used more widely in recent years. Pigment inks have high image density because the pigment particles remain on the surface of the paper, but on the other hand, their abrasion resistance is not sufficient. In the past, inks containing wax emulsions have been considered to improve abrasion resistance (see, for example, Patent Document 1).

However, while the technology disclosed in Patent Document 1 improves the degree of abrasion resistance, the degree of improvement is not sufficient. Inks containing resin emulsions with low glass transition points, such as urethane resin emulsions, have also been considered. Although these inks improve abrasion resistance sufficiently, when the image is heated to dry it after printing, the image density decreases.

The object of the present invention is therefore to provide a recording device capable of applying an image having excellent image density and abrasion resistance to a substrate.

The above problem is solved by the following configuration 1).
1) A recording apparatus having an aqueous liquid composition, an ejection mechanism that ejects the aqueous liquid composition onto a substrate, and a substrate treatment mechanism that treats the substrate onto which the aqueous liquid composition has been ejected by the ejection mechanism,
the substrate processing mechanism includes a transport member that sandwiches and transports the substrate, and a pressing member that curves and deforms a portion of the transport member within a region where the transport member sandwiches the substrate,
the aqueous composition liquid contains water, a pigment, and a resin emulsion, the resin emulsion containing a resin emulsion A having a glass transition temperature (Tg) of 80° C. or higher and a resin emulsion B having a glass transition temperature (Tg) of 40 to 65° C .;
The ratio of the resin emulsion A to the resin emulsion B in the aqueous composition liquid is 2 to 5 in terms of a mass ratio of the resin emulsion A/the resin emulsion B.
A recording device comprising:

The present invention provides a recording device that can apply an image having excellent image density and abrasion resistance to a substrate.

FIG. 1 is a schematic explanatory diagram of a recording apparatus equipped with a substrate treatment mechanism used in the present invention. FIG. 2 is a side view of the substrate treatment mechanism of the present invention; FIG. 4 is an explanatory diagram of a pressing roller portion of the substrate processing mechanism of the present invention.

Hereinafter, the embodiments of the present invention will be described in further detail.
The recording device of the present invention comprises an aqueous liquid composition, an ejection mechanism which ejects the aqueous liquid composition onto a substrate, and a substrate treatment mechanism which processes the substrate onto which the aqueous liquid composition has been ejected by the ejection mechanism, the substrate treatment mechanism including a transport member which sandwiches and transports the substrate, and a pressing member which curves and deforms a part of the transport member within a region in which the transport member sandwiches the substrate, the aqueous liquid composition comprising water, a pigment, and a resin emulsion, the resin emulsion comprising resin emulsion A having a glass transition temperature (Tg) of 80° C. or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65° C.

The recording device of the present invention can impart an image with excellent image density and abrasion resistance to a substrate, and its mechanism of action is presumed to be that when the substrate sandwiched between the transport members is transported in the substrate processing mechanism, the transport members are curved and deformed by the pressing member, the substrate comes into contact with the transport member, and the image is abraded, and the frictional heat promotes film formation of the resin emulsion in the aqueous liquid composition, making the image surface smooth, increasing the glossiness and improving the image density as well as the abrasion resistance. It is presumed that this effect is further enhanced by the resin emulsions A and B contained in the aqueous liquid composition.

First, the aqueous composition liquid of the present invention will be described. The aqueous composition liquid contains water, a pigment, and a resin emulsion, and may further contain an organic solvent, a penetrant, and other components as necessary. Note that, in the following, the aqueous composition liquid of the present invention will be described using ink as an example, but the aqueous composition liquid of the present invention is not limited to ink.

<Organic Solvent>
The organic solvent used in the present invention is not particularly limited, and any water-soluble organic solvent can be used. Examples of the organic solvent 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 the water-soluble organic solvent include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 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, and the like. polyhydric alcohols such as 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, and petriol; ethylene glycol monoethyl ether; and ethylene glycol monobutyl ether. polyhydric alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, and γ-butyrolactone; amides such as formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, and 3-butoxy-N,N-dimethylpropionamide; amines such as monoethanolamine, diethanolamine, and triethylamine; sulfur-containing compounds such as dimethyl sulfoxide, sulfolane, and thiodiethanol; propylene carbonate, and ethylene carbonate.
It is preferable to use an organic solvent having a boiling point of 250° C. or less, since this not only functions as a wetting agent but also provides good drying properties.

<Penetrating agent>
Polyol compounds having 8 or more carbon atoms and glycol ether compounds are also suitably 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 the glycol ether compound include polyhydric alcohol alkyl ethers 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; and polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.
Polyol compounds having 8 or more carbon atoms and glycol ether compounds can improve the permeability of the ink when paper is used as the recording medium.
The content of the organic solvent in the ink is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of the drying property and ejection reliability of the ink, however, the content is preferably from 10% by mass to 60% by mass, and more preferably from 20% by mass to 60% by mass.

<Water>
The water content in the ink is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of the drying property and ejection reliability of the ink, however, the water content is preferably from 10% by mass to 90% by mass, and more preferably from 20% by mass to 60% by mass.

<Pigments>
As the coloring material, a pigment can be used.
As the pigment, inorganic pigments or organic pigments can be used. These pigments can be used alone or in combination of two or more. Mixed crystals can also be used.
Examples of pigments that can be used include black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, glossy pigments such as gold and silver pigments, and metallic pigments.
As inorganic pigments, titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, as well as carbon black produced by known methods such as the contact method, furnace method, and thermal method can be used.
As organic pigments, 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 (e.g., basic dye type chelates, acid dye type chelates, etc.), nitro pigments, nitroso pigments, aniline black, etc. can be used. 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 colors include carbon blacks (C.I. Pigment Black 7) such as furnace black, lamp black, acetylene black, and channel black; metals such as copper, iron (C.I. Pigment Black 11), and titanium oxide; and organic pigments such as aniline black (C.I. Pigment Black 1).
Further, for color, C.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. Pigment Orange 5, 13, 16, 17, 36, 43, 51, C.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 ochre), 1 04, 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. Pigment Violet 1 (Rhodamine Lake), 3, 5:1, 16, 19, 23, 38, C.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. Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc.

The content of the coloring material in the ink is preferably from 0.1% by mass to 15% by mass, and more preferably from 1% by mass to 10% by mass, from the viewpoints of improving image density, good fixing property and ejection stability.
Methods for dispersing a pigment in an ink include a method of introducing a hydrophilic functional group into the pigment to make it a self-dispersing pigment, a method of dispersing the pigment by coating the surface of the pigment with a resin, and a method of dispersing the pigment using a dispersant.
As a method for making a pigment into a self-dispersing pigment by introducing a hydrophilic functional group, for example, a self-dispersing pigment that can be dispersed in water by adding a functional group such as a sulfone group or a carboxyl group to a pigment (e.g., carbon) can be used.
As a method for coating the surface of a pigment with a resin and dispersing it, a method for encapsulating the pigment in a microcapsule and dispersing it in water can be used. This can be called a resin-coated pigment. In this case, it is not necessary for all the pigments blended in the ink to be coated with a resin, and uncoated or partially coated pigments may be dispersed in the ink as long as the effects of the present invention are not impaired.

Examples of the method for dispersing using a dispersant include a method for dispersing using a known low molecular weight dispersant or a polymeric dispersant, typified by a surfactant.
As the dispersant, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc. can be used depending on the pigment.
RT-100 (nonionic surfactant) manufactured by Takemoto Oil Co., Ltd. and sodium naphthalenesulfonate formalin condensate can also be suitably used as dispersants.
The dispersants may be used alone or in combination of two or more.

<Pigment Dispersion>
It is possible to obtain ink by mixing a coloring material with water, an organic solvent, or the like. It is also possible to manufacture ink by mixing a pigment with other ingredients such as water and a dispersant to prepare a pigment dispersion, and then mixing the pigment dispersion with other ingredients such as water and an organic solvent.
The pigment dispersion is obtained by dispersing water, a pigment, a pigment dispersant, and other components as required, and adjusting the particle size. Dispersion is preferably performed using a dispersing machine.
The particle size of the pigment in the pigment dispersion is not particularly limited, but in terms of improving the dispersion stability of the pigment and improving the image quality such as ejection stability and image density, the maximum frequency in terms of the maximum number is preferably 20 nm or more and 500 nm or less, and more preferably 20 nm or more and 150 nm or less. The particle size of the pigment can be measured using a particle size analyzer (Nanotrac Wave-UT151, manufactured by Microtrac Bell Co., Ltd.).
The content of the pigment in the pigment dispersion is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoints of obtaining good ejection stability and increasing image density, the content of the pigment is preferably from 0.1% by mass to 50% by mass, and more preferably from 0.1% by mass to 30% by mass.
It is preferable that the pigment dispersion is degassed, if necessary, by filtering coarse particles using a filter, a centrifugal separator, or the like.

<Resin>
The ink contains a resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and a resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C.

If the Tg of the resin emulsion A is less than 80°C, the effects of the present invention will not be achieved, and image peeling may occur due to blocking when printed matter is overlapped. The preferred Tg of the resin emulsion A is 80°C to 100°C.

In addition, it is preferable that the Tg of the resin emulsion B is 40 to 65°C, since this can suppress blocking of the printed matter while achieving a high level of abrasion resistance.

The Tg of the resin emulsion in the present invention is measured by the following method.
5 g of the ink is dropped onto a Teflon (registered trademark) petri dish having a diameter of 4 cm, and dried for 72 hours in an environment of 50° C. to obtain a dried resin product. The dried resin product obtained is measured using a differential scanning calorimeter (Thermo plus EVO2 DSC8231, manufactured by Rigaku Corporation) to calculate the glass transition temperature (Tg).

Examples of resins include urethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, vinyl chloride resin, styrene acrylic resin, and acrylic silicone resin. Resin particles made of these resins may be used. Ink can be obtained by mixing the resin particles in a resin emulsion state in which the resin particles are dispersed using water as a dispersion medium with materials such as coloring materials and organic solvents. The resin particles may be appropriately synthesized or commercially available products may be used.

From the viewpoint of improving the effects of the present invention, the volume average particle size is preferably 30 nm to 200 nm, and more preferably 50 nm to 120 nm. In addition, from the viewpoint of obtaining good image hardness, the difference in cumulative particle size D50 between the pigment and the resin emulsion is preferably 10 nm or less.
The volume average particle size can be measured, for example, by using a particle size analyzer (Nanotrac Wave-UT151, manufactured by Microtrac Bell Co., Ltd.).

In addition, from the viewpoint of improving the effects of the present invention, the ratio of the resin emulsion A to the resin emulsion B is preferably 2 to 5 in terms of the mass ratio of the resin emulsion A/the resin emulsion B.

There are no particular limitations on the resin content, and it can be selected appropriately depending on the purpose, but from the standpoint of fixation and ink storage stability, it is preferably 1% by mass or more and 30% by mass or less, and more preferably 5% by mass or more and 20% by mass or less, based on the total amount of ink.

Wax can also be added to the ink. Adding wax has the effect of improving abrasion resistance.

The wax is preferably a water-dispersible wax emulsion.
Examples of the wax include polyethylene wax and paraffin wax. These may be used alone or in combination of two or more. Among these, polyethylene wax is preferred from the viewpoint of storage stability.

As the wax, commercially available products can be used, and examples of the commercially available products include product name: HYTEC E-8237 (polyethylene wax, melting point: 106°C, average particle size: 80 nm, manufactured by Toho Chemical Industry Co., Ltd.), product name: AQUACER 531 (polyethylene wax, melting point: 130°C, manufactured by BYK-Chemie), product name: AQUACER 515 (polyethylene wax, melting point: 135°C, manufactured by BYK-Chemie), and product name: AQUACER 537 (paraffin, melting point: 110°C, manufactured by BYK-Chemie). These may be used alone or in combination of two or more types.

The melting point of the wax is preferably 70°C or higher and 170°C or lower, and more preferably 100°C or higher and 140°C or lower. If the melting point is 70°C or higher, the image will not become sticky and image transfer will not occur even if images are overlapped, and if the melting point is 170°C or lower, the image will melt due to frictional heat when rubbed, providing slipperiness and good abrasion resistance.

The volume average particle diameter of the wax is preferably 200 nm or less, and more preferably 20 nm to 150 nm. When the volume average particle diameter is 200 nm or less, the wax is not caught in the nozzle or the filter in the head, and good ejection stability can be obtained.
The volume average particle size can be measured, for example, by using a particle size analyzer (Microtrac Model UPA9340, manufactured by Nikkiso Co., Ltd.).

The wax content is preferably 0.05 to 3% by mass, and more preferably 0.1 to 1% by mass, in terms of solid content, relative to the total amount of ink.

<Additives>
If necessary, surfactants, antifoaming agents, antiseptic and antifungal agents, rust inhibitors, pH adjusters, and the like may be added to the ink.

<Surfactant>
As the surfactant, any of silicone-based surfactants, fluorine-based surfactants, amphoteric surfactants, nonionic surfactants, and anionic surfactants can be used.

There are no particular limitations on the silicone surfactants, and they can be selected appropriately depending on the purpose. Among them, those that do not decompose even at high pH are preferred, and examples thereof include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane of the side chain, and those having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group are particularly preferred, since they exhibit good properties as aqueous surfactants. In addition, polyether-modified silicone surfactants can also be used as the silicone surfactant, and examples thereof include compounds in which a polyalkylene oxide structure is introduced into the Si part side chain of dimethylsiloxane.

As the fluorine-based surfactant, for example, perfluoroalkyl sulfonic acid compound, perfluoroalkyl carboxylic acid compound, perfluoroalkyl phosphate compound, perfluoroalkyl ethylene oxide adduct, and polyoxyalkylene ether polymer compound having perfluoroalkyl ether group in the side chain are particularly preferred because they have low foaming properties. As the perfluoroalkyl sulfonic acid compound, for example, perfluoroalkyl sulfonic acid, perfluoroalkyl sulfonate, etc. are included. As the perfluoroalkyl carboxylic acid compound, for example, perfluoroalkyl carboxylic acid, perfluoroalkyl carboxylate, etc. are included. As the polyoxyalkylene ether polymer compound having perfluoroalkyl ether group in the side chain, for example, sulfate ester salt of polyoxyalkylene ether polymer having perfluoroalkyl ether group in the side chain, salt of polyoxyalkylene ether polymer having perfluoroalkyl ether group in the side chain, etc. are included. Examples of counter ions of the salts in these fluorosurfactants include Li, Na, _K , _{NH4 , NH3CH2CH2OH} , _NH2 ( _CH2CH2OH ) ₂ , _and NH( _{CH2CH2OH ) 3} .

Examples of amphoteric surfactants include lauryl aminopropionate, lauryl dimethyl betaine, stearyl dimethyl betaine, and lauryl dihydroxyethyl betaine.
Examples of nonionic surfactants include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and ethylene oxide adducts of acetylene alcohol.
Examples of the anionic surfactant include polyoxyethylene alkyl ether acetates, dodecylbenzene sulfonates, laurates, and salts of polyoxyethylene alkyl ether sulfates.
These may be used alone or in combination of two or more.

The silicone surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples of the silicone surfactant include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end side-chain modified polydimethylsiloxane. Polyether-modified silicone surfactants having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group are particularly preferred because they exhibit good properties as an aqueous surfactant.
Such surfactants may be synthesized appropriately or may be commercially available products, such as those available from BYK-Chemie Co., Ltd., Shin-Etsu Chemical Co., Ltd., Dow Corning Toray Silicone Co., Ltd., Nippon Emulsion Co., Ltd., and Kyoeisha Chemical Co., Ltd.
The polyether-modified silicone surfactant is not particularly limited and can be appropriately selected depending on the purpose. For example, it can be a surfactant represented by the general formula (S-1) in which a polyalkylene oxide structure is introduced into the Si part side chain of dimethylpolysiloxane.

(In the general formula (S-1), m, n, a, and b represent integers. R and R' represent alkyl and alkylene groups.)

As the polyether-modified silicone surfactant, commercially available products can be used, such as KF-618, KF-642, KF-643 (Shin-Etsu Chemical Co., Ltd.), EMALEX-SS-5602, SS-1906EX (Nihon 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 Co., Ltd.), TSF4440, TSF4452, TSF4453 (Toshiba Silicon Co., Ltd.), etc.

The fluorine-based surfactant is preferably a compound having 2 to 16 fluorine-substituted carbon atoms, and more preferably a compound having 4 to 16 fluorine-substituted carbon atoms.
The fluorine-based surfactant may include perfluoroalkyl phosphate compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in side chains, etc. Among these, polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in side chains are preferred because they have low foaming properties, and the fluorine-based surfactants represented by general formula (F-1) and general formula (F-2) are particularly preferred.

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

General formula (F-2)
C _n F _2n+1- CH ₂ CH(OH)CH ₂ -O-(CH ₂ CH ₂ O) _a -Y

In the compound represented by the above general formula (F-2), Y is H, or CnF _2n+1 where n is an integer from 1 to 6, or CH ₂ CH(OH)CH ₂ -CnF _2n+1 where n is an integer from 4 to 6, or CpH _2p+1 where p is an integer from 1 to 19. a is an integer from 4 to 14.

As the fluorine-based surfactant, commercially available products may be used. Examples of such 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.); Fullard FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, and FC-431 (all manufactured by Sumitomo 3M Limited); Megafac F-470, F-1405, and F-474 (all manufactured by Dainippon Ink and Chemicals, Inc.); Zonyl TBS, FSP, FSA, FSN-100, and F SN, FSO-100, FSO, FS-300, UR (all manufactured by DuPont); 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.), and the like are preferred. Among these, DuPont is particularly preferred because of its excellent printing quality, particularly its color development, penetrability into paper, wettability, and uniform dyeing. Particularly preferred are FS-300 manufactured by Pont, FT-110, FT-250, FT-251, FT-400S, FT-150, and FT-400SW manufactured by Neos Co., Ltd., Polyfox PF-151N manufactured by Omnova, and Unidyne DSN-403N manufactured by Daikin Industries, Ltd.

The content of the surfactant in the ink is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of excellent wettability, ejection stability, and improved image quality, it is preferably 0.001% by mass or more and 5% by mass or less, and more preferably 0.05% by mass or more and 5% by mass or less.

<Antifoaming agent>
The defoaming agent is not particularly limited, and examples thereof include silicone-based defoaming agents, polyether-based defoaming agents, and fatty acid ester-based defoaming agents. These may be used alone or in combination of two or more. Among these, silicone-based defoaming agents are preferred because of their excellent foam breaking effect.

<Anti-septic and anti-fungal agents>
The antiseptic and antifungal agent is not particularly limited, and examples thereof include 1,2-benzisothiazolin-3-one.

<Rust inhibitor>
The rust inhibitor is not particularly limited, and examples thereof include acid sulfite and sodium thiosulfate.

<pH Adjuster>
There are no particular limitations on the pH adjuster, so long as it is capable of adjusting the pH to 7 or higher, and examples of the pH adjuster 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 purpose. For example, it is preferable that the viscosity, surface tension, pH, etc. are within the following ranges.
The viscosity of the ink at 25°C is preferably 5 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 terms of improving the print density and character quality and obtaining good ejection properties. Here, the viscosity can be measured using, for example, a rotational viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.). The measurement conditions are 25°C, a standard cone rotor (1°34'×R24), a sample liquid volume of 1.2 mL, a rotation speed of 50 rpm, and 3 minutes.
The surface tension of the ink is preferably 35 mN/m or less, and more preferably 32 mN/m or less at 25° C., in order to ensure 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, and more preferably from 8 to 11, from the viewpoint of preventing corrosion of metal members that come into contact with the ink.

<Recording media>
There are no particular limitations on the recording medium, and although plain paper, glossy paper, special paper, cloth, etc. can be used, good image formation is also possible using a non-permeable substrate.
The non-permeable substrate is a substrate having a surface with low water permeability and absorbency, and includes materials that have many cavities inside but are not open to the outside. More quantitatively, the non-permeable substrate is a substrate having a water absorption amount of 10 mL/m2 ^{or less} from the start of contact to 30 msec ^1/2 in the Bristow method.
As the non-permeable substrate, for example, a plastic film such as a polyvinyl chloride resin film, a polyethylene terephthalate (PET) film, a polypropylene film, a polyethylene film, or a polycarbonate film can be suitably used.

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

In addition, in the terminology of this invention, image formation, recording, printing, printing, etc. are all synonymous. Substrate, recording medium, media, and printed material are all synonymous.

Hereinafter, a recording apparatus and a recording method of the present invention will be described with reference to the drawings.
The recording device of the present invention has an ejection mechanism that ejects the aqueous liquid composition onto a substrate, and a substrate treatment mechanism that processes the substrate onto which the aqueous liquid composition has been ejected by the ejection mechanism, and the substrate treatment mechanism includes a transport member that clamps and transports the substrate, and a pressing member that curves and deforms a portion of the transport member within the area where the transport member clamps the substrate.
The recording method of the present invention further comprises a discharge step of discharging the aqueous liquid composition onto a substrate, and a substrate treatment step of treating the substrate onto which the aqueous liquid composition has been discharged by the discharge mechanism, the substrate treatment step including a pressing step of pressing a pressing member against a transport member within a region where the transport member holds the substrate while sandwiching the substrate between the transport members, thereby curving and deforming a portion of the transport member.

Figure 1 is a schematic diagram of a recording device equipped with a substrate treatment mechanism used in the present invention.

The printing device 1 comprises an input section 100, a printing section 200, a drying section 300, a sheet processing section 600 constituted by a substrate processing mechanism according to the present invention, and an output section 400. In the printing device 1, the printing section 200 applies liquid to a sheet P as a substrate input from the input section 100 to perform the required printing, the drying section 300 dries the liquid adhering to the sheet P, and the sheet processing section 600 processes the sheet P and discharges the sheet P to the output section 400.

The loading section 100 includes an input tray 110 on which multiple sheets P are stacked, a feeding device 120 that separates and sends out the sheets P one by one from the input tray 110, and a pair of registration rollers 130 that sends the sheets P to the printing section 200.

The feeding device 120 can be any type of feeding device, such as a device using rollers or a device using air suction. After the leading edge of the sheet P sent out from the input tray 110 by the feeding device 120 reaches the pair of registration rollers 130, the pair of registration rollers 130 are driven at a predetermined timing to send the sheet P to the printing unit 200.

The printing section 200 includes a carrying drum 210 that carries and transports the sheet P on its outer peripheral surface, and a liquid ejection section 220 that is a means for applying liquid by ejecting liquid toward the sheet P carried on the carrying drum 210. The printing section 200 also includes a transfer cylinder 201 that receives the fed sheet P and passes it to the carrying drum 210, and a transfer cylinder 202 that passes the sheet P transported by the carrying drum 210 to the drying section 300.

The sheet P transported from the loading section 100 to the printing section 200 has its leading edge gripped by a sheet gripper provided on the surface of the transfer cylinder 201, and is transported as the transfer cylinder 201 rotates. The sheet P transported by the transfer cylinder 201 is delivered to the carrying drum 210 at a position opposite the carrying drum 210.

A sheet gripper is also provided on the surface of the carrying drum 210, and the leading edge of the sheet P is gripped by the sheet gripper. A number of suction holes are formed in a distributed manner on the surface of the carrying drum 210, and a suction device 211 generates a suction airflow in the direction toward the inside of the carrying drum 210 at each suction hole.

Then, the sheet P transferred from the transfer drum 201 to the carrying drum 210 has its leading edge gripped by the sheet gripper and is adsorbed to the surface of the carrying drum 210 by the suction airflow, and is transported as the carrying drum 210 rotates.

The liquid ejection unit 220 constitutes an ejection mechanism that ejects the ink onto the sheet P, ejects liquid (ink) of four colors, C (cyan), M (magenta), Y (yellow), and K (black), to print an image, and is equipped with liquid ejection heads 220C, 220M, 220Y, and 220K, which are means for applying individual liquids for each color. If necessary, liquid ejection heads that eject special liquids such as white, gold, and silver liquids, and liquid ejection heads that eject treatment liquids such as surface coating liquids can also be provided.

The ejection operation of each of the liquid ejection heads 220C, 220M, 220Y, and 220K of the liquid ejection unit 220 is controlled by a drive signal corresponding to the printing information. When the sheet P supported on the support drum 210 passes through an area facing the liquid ejection unit 220, liquid of each color is ejected from the liquid ejection heads 220C, 220M, 220Y, and 220K, and an image corresponding to the printing information is printed.

The drying section 300 is a drying device, and includes a suction conveyor belt 301 that adsorbs and conveys the sheet P conveyed from the printing section 200, and a hot air blowing means 302 that blows hot air to dry the liquid on the sheet P conveyed by the suction conveyor belt 301. The suction conveyor belt 301 is, for example, stretched between a drive roller 303 and a driven roller 304, and moves in a circle by driving the drive roller 303.

The sheet P conveyed from the printing unit 200 is received by the suction conveying belt 301, then conveyed to pass through the hot air blowing means 302, and delivered to the sheet processing unit 600, from which it is delivered to the discharge unit 400.

When passing through the hot air blowing means 302, the liquid on the sheet P is subjected to a drying process. This causes the water content in the liquid and other liquid components to evaporate, and the colorant contained in the liquid is fixed onto the sheet P.

The discharge section 400 is equipped with a discharge tray 410 on which multiple sheets P are stacked. The sheets P conveyed from the sheet processing section 600 are stacked and held on the discharge tray 410 in sequence.

In addition, in the printing device 1, for example, a pre-processing unit that performs pre-processing on the sheet P can be disposed upstream of the printing unit 200, and a post-processing unit that performs post-processing on the sheet P to which liquid has adhered can be disposed between the sheet processing unit 600 and the discharge unit 400.

Examples of the pre-treatment section include a section that performs a pre-coating process in which a treatment liquid that reacts with the liquid to suppress bleeding is applied to the sheet P. Examples of the post-treatment section include a section that performs a sheet reversal and transport process in which a sheet printed in the printing section 200 is reversed and sent back to the printing section 200 to print on both sides of the sheet P, and a process for binding multiple sheets.

In addition, the "recording device" in this application is not limited to an inkjet recording device, but is not limited to a device equipped with a liquid ejection head that ejects liquid toward a sheet and visualizes meaningful images such as letters and figures using the ejected liquid, and also includes, for example, a device that forms patterns that have no meaning in themselves.

The ink may have a viscosity and surface tension that allows it to be ejected from the head, and is not particularly limited, but it is preferable that the viscosity of the ink is 30 mPa·s or less at room temperature and pressure, or by heating or cooling. More specifically, the ink may be a solution, suspension, emulsion, etc. that contains a solvent such as water or an organic solvent, a colorant such as a dye or pigment, a functionalizing material such as a polymerizable compound, a resin, or a surfactant, a biocompatible material such as DNA, amino acids, proteins, or calcium, an edible material such as a natural dye, etc., and these can be used, for example, as an inkjet ink, a surface treatment liquid, etc.

The term "recording device" also includes serial type devices that move a liquid ejection head, and line type devices that do not move a liquid ejection head.

A "liquid ejection head" is a functional component that ejects and sprays liquid from an ejection hole (nozzle). As an energy generation source for ejecting liquid, ejection energy generation means such as a piezoelectric actuator (a laminated piezoelectric element or a thin-film piezoelectric element), a thermal actuator that uses an electrothermal conversion element such as a heating resistor, or an electrostatic actuator consisting of a vibration plate and an opposing electrode can be used, but the ejection energy generation means used is not limited.

Next, the substrate processing mechanism according to the present invention, which constitutes the sheet processing unit in the embodiment of the present invention, will be described with reference to Figures 2 and 3. Figure 2 is a side view of the substrate processing mechanism, and Figure 3 is an explanatory view of the roller portion.

The substrate processing mechanism 601 has a transport member that sandwiches and transports the substrate. In the embodiment shown in FIG. 2, the substrate processing mechanism 601 has a belt pair 602 that is composed of an endless upper belt 611 and a lower belt 612 that sandwich and transport the sheet P.

The upper belt 611 is looped around a conveyor roller 621A, a steering control roller 622A, and driven rollers 624A and 625A, and tension is applied by a tension roller 623A.

The lower belt 612 is looped around a conveyor roller 621B, a steering control roller 622B, and driven rollers 624B and 625B, and tension is applied by a tension roller 623B.

The upper belt 611 and the lower belt 612 move in the direction of the arrow as the conveying rollers 621A and 621B are rotated and driven, sandwiching the sheet P and conveying it in the conveying direction (the direction of the arrow Y, hereafter referred to as the "conveying direction Y").

Here, tension rollers 623A and 623B act as tension applying means that apply tension to each of belts 611 and 612 of belt pair 602 in a direction in which the belt surface of belt pair 602, which holds sheet P between them, is pulled upstream and downstream in conveying direction Y.

The rollers 603 (603A, 603B) are curved members that contact the upper belt 611 or the lower belt 612 of the belt pair 602 in the region where the belt surfaces of the upper belt 611 and the lower belt 612 of the belt pair 602 face each other and sandwich the sheet P. The rollers 603 are arranged along the conveying direction Y. The rollers 603 deform a part of the belt pair 602 into a curved shape.

The roller 603 is a heating roller that incorporates a heater 604 as a heat generating means and also serves as a heating means for heating the area of the sheet P that is pressed against the roller 603 via the belt pair 602 and is curved and deformed.

Here, rollers 603A and 603B are arranged alternately in the area where the belt surfaces of the upper belt 611 and the lower belt 612 face each other.

Then, by pressing the lower belt 612 side of the belt pair 602 against the peripheral surface 603a of the roller 603A (see FIG. 3), the belt pair 602 is curved and deformed so as to have an upward convex shape. Also, by pressing the upper belt 611 side of the belt pair 602 against the peripheral surface 603a of the roller 603B, the belt pair 602 is curved and deformed so as to have a downward convex shape.

In other words, in the conveying direction of the sheet P, rollers 603A that bend one side of the sheet P in a direction that makes it convex and rollers 603B that bend the other side of the sheet P in a direction that makes it convex are arranged alternately. It is also possible to arrange rollers 603A and 603B alternately, with roller 603B on the most upstream side.

A roller-shaped first pressing member 606 and a roller-shaped second pressing member 607, which constitute a pressing means that faces the peripheral surface (curved surface) of the roller 603 and presses the belt pair 602 against the peripheral surface of the roller 603, are arranged along the conveying direction P. Here, the first pressing member 606 is arranged on the upstream side of the conveying direction P, and the second pressing member 607 is arranged on the downstream side of the conveying direction P.

The first pressing member 606 determines the pressing start position (winding start position) where the belt pair 602 starts to contact the peripheral surface 603a of the roller 603. The second pressing member 607 determines the pressing end position (winding end position) where the belt pair 602 separates from the peripheral surface 603a of the roller 603.

Here, among the curved members (rollers 603) adjacent to each other in the conveying direction Y, the second pressing member 607 facing the upstream roller 603 and the first pressing member 606 facing the downstream roller 603 are spaced apart. In addition, the upstream roller 603 and the downstream roller 603 are spaced apart so that the belt pair 602 is not curved between the upstream second pressing member 607 and the downstream first pressing member 606.

This allows the stress on the belt pair 602, which had curved to follow the circumferential surface of the roller 603, to be released, improving adhesion to the next roller 603.

The first pressing member 606 and the second pressing member 607 are arranged so that they can move forward and backward (be movable) relative to the circumferential surface of the roller 603. This allows the wrap angle θ of the belt pair 602 to the circumferential surface of the roller 603 to be changed depending on the thickness (type) of the sheet P, the amount of liquid applied, etc.

As described above, the substrate treatment mechanism 601 includes a pair of belts 602 that sandwich and transport the sheet P, and a pressing member (pressing member) that curves and deforms a portion of the pair of belts 602 within the area where the pair of belts 602 sandwich the sheet P. By curving and deforming a portion of the pair of belts 602 while sandwiching the sheet P between the pair of belts 602 and transporting it, the sheet P comes into contact with the pair of belts 602 and the image is rubbed, and the frictional heat promotes film formation of the resin emulsion in the ink, and the image surface becomes smooth, which increases the glossiness, improves the image density, and improves the abrasion resistance.

The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. Note that Example 6 refers to Reference Example 6, which is not included in the present invention.

(Preparation Example 1)
--Preparation of Magenta Pigment-Containing Polymer Microparticle Dispersion--
<Preparation of Polymer Solution A>
A 1 L flask equipped with a mechanical stirrer, a thermometer, a nitrogen gas inlet tube, a reflux condenser, and a dropping funnel was thoroughly purged with nitrogen gas, and then 11.2 g of styrene, 2.8 g of acrylic acid, 12.0 g of lauryl methacrylate, 4.0 g of polyethylene glycol methacrylate, 4.0 g of styrene macromer, and 0.4 g of mercaptoethanol were mixed and heated to 65° C.
Next, a mixed solution of 100.8 g of styrene, 25.2 g of acrylic acid, 108.0 g of lauryl methacrylate, 36.0 g of polyethylene glycol methacrylate, 60.0 g of hydroxyl ethyl methacrylate, 36.0 g of styrene macromer, 3.6 g of mercaptoethanol, 2.4 g of azobismethylvaleronitrile, and 18 g of methyl ethyl ketone was dropped into the flask over 2.5 hours. After the dropwise addition, a mixed solution of 0.8 g of azobismethylvaleronitrile and 18 g of methyl ethyl ketone was dropped into the flask over 0.5 hours. After aging at 65 ° C for 1 hour, 0.8 g of azobismethylvaleronitrile was added and further aged for 1 hour. After the reaction was completed, 364 g of methyl ethyl ketone was added to the flask, and 800 g of polymer solution A with a concentration of 50% by mass was obtained.

<Preparation of Pigment-Containing Polymer Microparticle Dispersion>
28 g of polymer solution A, 42 g of C.I. Pigment Red 122, 13.6 g of 1 mol/L potassium hydroxide aqueous solution, 20 g of methyl ethyl ketone, and 13.6 g of ion-exchanged water were thoroughly stirred and then kneaded using a roll mill. The obtained paste was added to 200 g of pure water, thoroughly stirred, and then methyl ethyl ketone and water were distilled off using an evaporator. In order to remove further coarse particles, the dispersion was pressure-filtered with a polyvinylidene fluoride membrane filter with an average pore size of 5.0 μm to obtain a magenta pigment-containing polymer microparticle dispersion containing 15% by weight of pigment and 20% by weight of solids. The average particle diameter (D50) of the polymer microparticles in the obtained magenta pigment-containing polymer microparticle dispersion was measured and found to be 108 nm. The average particle diameter (D50) was measured using a particle size distribution measuring device (Nanorakku UPA-EX150, manufactured by Nikkiso Co., Ltd.).

(Preparation Example 2)
- Preparation of cyan pigment-containing polymer particle dispersion -
A cyan pigment-containing polymer fine particle dispersion was prepared in the same manner as in Preparation Example 1, except that the pigment CI Pigment Red 122 in Preparation Example 1 was changed to a phthalocyanine pigment (CI Pigment Blue 15:3).
The average particle diameter (D50) of the polymer fine particles in the obtained cyan pigment-containing polymer fine particle dispersion was measured using a particle size distribution measuring device (Nanotrac UPA-EX150, manufactured by Nikkiso Co., Ltd.) and was found to be 93 nm.

(Preparation Example 3)
--Preparation of yellow pigment-containing polymer particle dispersion--
A yellow pigment-containing polymer fine particle dispersion was prepared in the same manner as in Preparation Example 1, except that the pigment CI Pigment Red 122 in Preparation Example 1 was changed to a monoazo yellow pigment (CI Pigment Yellow 74).
The average particle diameter (D50) of the polymer fine particles in the obtained yellow pigment-containing polymer fine particle dispersion was measured using a particle size distribution measuring device (Nanotrac UPA-EX150, manufactured by Nikkiso Co., Ltd.) and was found to be 90 nm.

(Preparation Example 4)
- Preparation of carbon black pigment-containing polymer particle dispersion -
A carbon black pigment-containing polymer fine particle dispersion was prepared in the same manner as in Preparation Example 1, except that the CI Pigment Red 122 used in Preparation Example 1 was replaced with carbon black (FW100, manufactured by Degussa).
The average particle diameter (D50) of the polymer fine particles in the obtained carbon black pigment-containing polymer fine particle dispersion was 104 nm as measured with a particle size distribution measuring device (Nanotrac UPA-EX150, manufactured by Nikkiso Co., Ltd.).

-Preparation of styrene acrylic resin A-
As the olefin polymer (1), 1000 g of a propylene-butene-ethylene terpolymer (Bestplast 750, manufactured by Degussa Japan), 100 g of a maleic anhydride modified polypropylene wax (Hiwax NP0555A, manufactured by Mitsui Chemicals, Inc.), and 40 g of potassium oleate (KS Soap, manufactured by Kao Corporation) were mixed and fed from the hopper of a twin-screw extruder (manufactured by Ikegai Iron Works, PCM-300, L/D=40) at a rate of 3000 g/hour. A 17% aqueous solution of potassium hydroxide was continuously fed from a feed port provided in the vent of the extruder at a rate of 120 g/hour (4% per total), and the mixture was continuously extruded at a superheat temperature of 200°C. The extruded resin mixture was cooled to 90°C in a jacketed static mixer installed in the extruder, and then poured into warm water at 80°C to obtain an aqueous dispersion (2) of an olefin polymer with a yield of 99%, a solid content concentration of 40%, and a pH of 12. A separable flask equipped with a stirrer, a reflux condenser, and a thermometer was charged with 217.3g of deionized water and 2.3g of sodium dodecylsulfonate, an anionic dispersant, and stirred until the entire mixture was homogenous. Under stirring, 0.65g of 25% ammonia water was added, and 25g of the aqueous dispersion (2) of an olefin polymer was added, and stirred until the entire mixture was homogenous. Further, under stirring, a mixed solution of 10.2g of styrene and 12.4g of butyl acrylate was added, and nitrogen bubbling was performed for 1 hour and 30 minutes while stirring to remove dissolved oxygen in the system. After bubbling, the temperature was raised to 70°C. When the internal temperature reached 70°C, 0.32 g of a 10% aqueous solution of 4,4'-azobis(4-cyanopentanoic acid) was added as a water-soluble radical initiator, and polymerization was completed after 6 hours. The water-dispersible styrene acrylic resin A had a Tg of 90°C and a particle size D50 of 120 nm.

- Preparation of styrene acrylic resin B -
A separable flask equipped with a stirrer, a reflux condenser and a thermometer was charged with 250 g of deionized water, 1.04 g of [1-(O-ethylxanthryl)ethyl]benzene, which is an addition-fragmentation type chain transfer agent (RAFT agent) as a compound having living radical polymerizability, and 1.69 g of ethyl acrylate. In order to remove dissolved oxygen in the liquid, nitrogen bubbling was carried out for 1 hour and 30 minutes. After the bubbling was completed, the temperature was raised to 70 ° C. while stirring with a stirrer. When the internal temperature reached 70 ° C., 5 g of a 10% aqueous solution of sodium persulfate was added as a water-soluble radical initiator. After 20 minutes, a mixture of 32.06 g of ethyl acrylate and 11.25 g of methacrylic acid was dropped so that the drop was completed in 3 hours. After the dropwise addition, the mixture was aged at 70 ° C. for 4 hours, and the polymerization of the aqueous dispersion (1) was completed. 203.4 g of deionized water and 14.8 g of aqueous dispersion (1) were charged into a separable flask equipped with a stirrer, a reflux condenser, and a thermometer, and the mixture was stirred until the mixture was homogenized. 0.65 g of 25% aqueous ammonia was added under stirring to obtain a colorless and transparent aqueous resin solution. 25 g of Chemipearl W400 (low molecular weight polyolefin emulsion, solid content 40%, manufactured by Mitsui Chemicals, Inc.) was added thereto, and the mixture was stirred until the mixture was homogenized. Furthermore, 22.5 g of styrene was added under stirring, and nitrogen bubbling was performed for 1 hour and 30 minutes while stirring to remove dissolved oxygen in the system. After the bubbling was completed, the temperature was raised to 70°C. When the internal temperature reached 70°C, 0.32 g of a 10% aqueous solution of 4,4'-azobis(4-cyanopentanoic acid) was added as a water-soluble radical initiator, and polymerization was completed after 6 hours. The Tg of the obtained water-dispersible styrene acrylic resin B was 65°C and the particle size D50 was 100 nm.

- Preparation of recording ink -
Each recording ink was manufactured according to the following procedure. First, the solvent, surfactant, resin, wax, and water shown in Table 1 below were mixed (mass %) and stirred for 1 hour to mix uniformly. The pigment dispersion was added to this mixture and stirred for 1 hour. This dispersion was pressure filtered through a polyvinylidene fluoride membrane filter with an average pore size of 5.0 μm to remove coarse particles and dust, and each recording ink was manufactured.

[Image formation]
Using the recording device shown in FIG. 1, images were recorded on both sides of the recording medium, and the images were evaluated. As the recording medium, Lumi Art Gloss 90 gsm roll paper was set as coated paper, and a solid image was recorded at a resolution of 1,200 dpi. At that time, the conveyance was stopped after passing through the drying section 300, the printed image was taken out, and the image density (after drying) was measured. In addition, the image density (after rubbing) of the printed image after passing through the processing section 600 was measured. In addition, blocking of the printed image discharged to the paper discharge section 400 was measured.

<Image density on coated paper>
After drying and rubbing, the image density of the printed matter was measured using a reflective color spectrophotometric densitometer (manufactured by X-Rite Corporation) and evaluated according to the following criteria.

[Evaluation Criteria]
⊚: Black: 1.6 or more Yellow: 1.3 or more Magenta: 1.4 or more Cyan: 1.6 or more ◯: Black: 1.3 or more, less than 1.6 Yellow: 1.0 or more, less than 1.3 Magenta: 1.1 or more, less than 1.4 Cyan: 1.3 or more, less than 1.6 △: Black: less than 1.3 Yellow: less than 1.0 Magenta: less than 1.1 Cyan: less than 1.3

(blocking)
The degree of adhesion between the recorded images and the state of image transfer (offset) were visually confirmed, and "blocking" was evaluated based on the following evaluation criteria. ◯ and Δ are acceptable.
[Evaluation Criteria]
◯: No image transfer △: Slight sticking is felt when peeling off, but no image transfer ×: Image transfer

<Abrasion resistance>
The obtained image was rubbed 20 times with a piece of paper (Lumi Art Gloss 90 gsm) cut into a square of 1.2 mm, and the ink stains on the paper were measured using a reflective color spectrophotometer (manufactured by X-Rite Corporation). The density was calculated by subtracting the background color of the rubbed paper, and the "rubbing property" was evaluated based on the following evaluation criteria. ◎, ◯, and △ are acceptable.
[Evaluation Criteria]
◎: Transfer density is less than 0.05. ◯: Transfer density is 0.05 or more and less than 0.10. △: Transfer density is 0.10 or more and less than 0.25. ×: Transfer density is 0.25 or more.

<Discharge stability>
Using a RICOH SG5100 as the printing device, 200 charts were printed out in succession on My Paper (manufactured by NBS Ricoh Co., Ltd.) in which 5% of the area of A4 size paper was filled with a solid image per color, created in Microsoft Word 2000, and evaluated from the ejection disturbance of each nozzle after printing. The print mode used was a mode in which the "plain paper - fast" mode was changed to "no color correction" from the plain paper user settings in the driver attached to the printer.
[Evaluation Criteria]
○: No disturbance in discharge △: Slight disturbance in discharge ×: Disturbance in discharge or some non-discharged portions

The results are shown in Table 1.

The abbreviations in Table 1 are as follows.
M100 (N,N-dimethyl-β-ethoxypropionamide: product name, manufactured by Idemitsu Kosan Co., Ltd.)
B100 (N,N-dimethyl-β-butoxypropionamide: product name, manufactured by Idemitsu Kosan Co., Ltd.)
EHO (3-ethyl-3-hydroxymethyloxetane: product name, manufactured by Ube Industries, Ltd.)
1,2-PD (1,2-propanediol: manufactured by ADEKA Corporation)
1,2-BD (1,2-butanediol: manufactured by Shinko Organic Chemical Industry Co., Ltd.)
・Gly (glycerin)
TEGO Wet 270 (polyether-modified siloxane surfactant: product name, manufactured by Evonik)
Surfynol 465 (nonionic surfactant: trade name, manufactured by Air Products and Chemicals, Inc.)
・AQUACER 532 (product name: wax emulsion manufactured by BYK, non-volatile content 45%)
・AQUACER 552 (product name: wax emulsion manufactured by BYK, non-volatile content 35%)
・AQUACER 1547 (product name: wax emulsion manufactured by BYK, non-volatile content 35%)

1 Printing apparatus 100 Carry-in section 110 Carry-in tray 120 Feeding device 130 Pair of registration rollers 200 Printing section 201 Transfer cylinder 202 Transfer cylinder 210 Carrying drum 211 Suction device 220 Liquid ejection section 220C, 220M, 220Y, 220K Liquid ejection head 300 Drying section 301 Suction conveying belt 302 Hot air blowing means 303 Driving roller 304 Driven roller 400 Carry-out section 410 Discharge tray 600 Sheet processing section P Sheet 601 Sheet processing mechanism 602 Pair of belts 603, 603A, 603B Pressing roller 603a Circumferential surface 604 Heater 606, 607 Opposing roller (opposing member)
608 Holder member 611 Upper belt 612 Lower belt 621A, 621B Conveyor rollers 622A, 622B Steering control rollers 623A, 623B Tension rollers 624A, 625A, 624B, 625B Driven rollers

JP 2017-88846 A

Claims (3)

A recording apparatus having an aqueous liquid composition, an ejection mechanism that ejects the aqueous liquid composition onto a substrate, and a substrate treatment mechanism that treats the substrate onto which the aqueous liquid composition has been ejected by the ejection mechanism,
the substrate processing mechanism includes a transport member that sandwiches and transports the substrate, and a pressing member that curves and deforms a portion of the transport member within a region where the transport member sandwiches the substrate,
the aqueous composition liquid contains water, a pigment, and a resin emulsion, the resin emulsion containing a resin emulsion A having a glass transition temperature (Tg) of 80° C. or higher and a resin emulsion B having a glass transition temperature (Tg) of 40 to 65° C .;
The ratio of the resin emulsion A to the resin emulsion B in the aqueous composition liquid is 2 to 5 in terms of a mass ratio of the resin emulsion A/the resin emulsion B.
A recording device comprising: 2. The recording apparatus according to claim 1 , wherein the aqueous liquid composition further contains a wax. A recording method comprising: a discharge step of discharging an aqueous liquid composition onto a substrate; and a substrate treatment step of treating the substrate onto which the aqueous liquid composition has been discharged by the discharge mechanism,
the substrate processing step includes a pressing step of pressing a pressing member against a transport member within a region where the transport member holds the substrate while sandwiching the substrate between the transport members, thereby bending and deforming a portion of the transport member;
the aqueous composition liquid contains water, a pigment, and a resin emulsion, the resin emulsion containing a resin emulsion A having a glass transition temperature (Tg) of 80° C. or higher and a resin emulsion B having a glass transition temperature (Tg) of 40 to 65° C .;
The ratio of the resin emulsion A to the resin emulsion B in the aqueous composition liquid is 2 to 5 in terms of a mass ratio of the resin emulsion A/the resin emulsion B.
A recording method comprising:

Images