Ricoh Company, Ltd.

Kiminori Masuda

Hiroaki Takahashi

Mio Akima

Michihiko Namba

Akiko Bannai

Takashi Tamai

Mariko Kojima

Satoshi Kojima

Amika Sagara

Naoko Kitaoka

Masayuki Koyano

Hiroki Hagiwara

Hidetoshi Fujii

Tsutomu Maekawa

Tomohiko Kohda

Mio Kumai

Azumi Miyaake

Masaki Kudo

Kohta Akiyama

Ayano Momose

Satomi Araki

Mayumi Yoshihara

Hiroki Nakane

Yukiko Takamura

Kaori Miyahara

An ink set is provided that includes a pretreatment liquid containing a resin (R1), a color ink containing a resin (R2), and a clear ink containing a resin (R3), in which the resin (R1), the resin (R2), and the resin (R3) have an identical type of bonding structure in a repeating unit of a molecule.

Ink set, image forming method, and image forming apparatus

A clear ink includes resin particles, water, and a compound represented by General Formula (1) below. The resin particles have a volume average particle diameter of 50 nm or less. A dried film of the clear ink has glass transition temperatures (Tg) at 50 degrees Celsius or higher and at lower than 0 degrees Celsius. In the General Formula (1), Rrepresents an alkyl group having 1 or more but 4 or less carbon atoms.

Clear ink, printing method, and inkjet printing apparatus

Provided is an inkjet printing device including an ink storage unit configured to store an ink, an ejection head configured to eject the ink to form a print layer, and a heating unit configured to heat a material to be printed, wherein the ink is an aqueous clear ink including a resin and water, the inkjet printing device has a low gloss printing mode that is a printing mode for imparting low gloss, and a high gloss printing mode that is a printing mode for imparting high gloss, and the heating unit is configured to heat to satisfy the following formula T&#x3e;T, where T(degrees Celsius) is a temperature of a low gloss printing region of the material to be printed where the low gloss printing region is printed with the low gloss printing mode when the aqueous clear ink is deposited on the material to be printed, and T(degrees Celsius) is a temperature of a high gloss printing region of the material to be printed where the high gloss printing region is printed with the high gloss printing mode when the aqueous clear ink is deposited on the material to be printed.

Inkjet printing device, inkjet printing method, and method for controlling glossiness of printed image

Inkjet printing apparatus including: ink accommodating unit storing ink; ejection head configured to eject the ink to form print layer; and heating unit configured to heat print target, wherein the ink is clear ink including resin and water, dry film of the clear ink has glass transition temperature of 50&#xb0; C. or more, the inkjet printing apparatus has first printing mode and second printing mode, and the heating unit is configured to heat the print target so that expression: T&#x3e;Tis satisfied, where the Tis temperature (&#xb0; C.) of the print target in printing region printed in the first printing mode obtained when the clear ink is deposited on the print target, and the Tis temperature (&#xb0; C.) of the print target in printing region printed in the second printing mode obtained when the clear ink is deposited on the print target.

Inkjet printing apparatus, inkjet printing method, and method for controlling glossiness of print image

An inkjet printing device includes an ink containing unit to contain a clear aqueous ink containing a resin, a compound represented by the following Chemical formula, and water, where Rrepresents an alkyl group having 1 to 4 carbon atoms, a discharging head to discharge the clear aqueous ink to printed matter to form a layer thereon in a low gloss printing mode or high gloss printing mode, and a heating device to heat the printed matter, wherein the heating device heats the printed matter satisfying the following relationship 1: Tlgloss&#x3e;Thgloss 1, where Tlgloss represents the temperature of the printed matter at a low gloss printing region in the low gloss printing mode and Thgloss represents the temperature of the printed matter in the high gloss printing mode when the clear aqueous ink is attached to the printed matter.

Inkjet printing device and inkjet printing method

A printing device includes an ink container, an ink in the ink container, the ink containing an aqueous clear ink and an aqueous color ink and a heating device configured to heat a substrate, wherein the relationship is satisfied, |S&#x2212;S|&#x2264;5 mN/m, where Srepresents the surface tension of the aqueous clear ink and Srepresents the surface tension of the aqueous color ink, wherein the printing device has a low gloss printing and a high gloss printing mode, wherein the heating device heats the substrate while satisfying the relationship: Tlow&#x3e;Thigh, where Tlow represents the temperature of the substrate in a low gloss printing region in which the aqueous clear ink is printed in the low printing mode and Thigh represents the temperature of the substrate in a high gloss printing region in which the aqueous clear ink is printed in the high printing mode.

Printing device and printing method

An inkjet printing device includes an ink container accommodating a non-aqueous clear ink containing a resin and an organic solvent, a discharging head to discharge the non-aqueous clear ink directly or indirectly onto a substrate to form printed matter; and a heating device to heat the substrate, wherein the following relationship is satisfied: Tlow (&#xb0; C.)&#x3e;Thigh (&#xb0; C.), where Tlow represents the temperature of the substrate that the heating device is heating during printing in a low gloss printing mode in which the non-aqueous clear ink is directly or indirectly discharged and attached to the substrate to impart low gloss to the printed matter and Thigh represents the temperature of the substrate that the heating device is heating during printing in a high gloss printing mode in which the non-aqueous clear ink is directly or indirectly discharged and attached to the substrate to impart high gloss to the printed matter.

A printing device includes an ink container accommodating a liquid containing a clear ink containing water and a resin, a discharging head to discharge the clear ink directly or indirectly onto a substrate to form a printing layer, and a heating device to heat the substrate, wherein the following relationship is satisfied: Tlow (degrees C.)&#x3e;Thigh (degrees C.), where Tlow (degrees C.) represents the temperature of the substrate that the heating device is heating during printing in a low gloss printing mode and Thigh (degrees C.) represents the temperature of the substrate that the heating device is heating during printing in a high gloss printing mode, wherein the following relationships are satisfied: in the high gloss printing mode, Gp&#x2265;Gm and, in the low gloss printing mode, Gm&#x2265;Gp, where Gm represents the gloss level of the substrate and Gp represents the gloss level of the printing layer.

An ink is provided. The ink includes a colorant, an organic solvent, a resin particle including an anionic urethane resin, and an organic amine compound having a boiling point in the range of from 120&#xb0; C. to 200&#xb0; C. and a molecular weight of 100 or less, and water, and the mass ratio of the organic amine compound to the resin particle is in the range of from 0.01 to 1.00.

Ink, image forming method, image forming apparatus, and image formed product

An ink includes water, a coloring material, an organic solvent having a solubility parameter of from 8.0 to 13.0, an urethane resin particle and a metal ion, wherein the organic solvent having the solubility parameter of from 8.0 to 13.0 has a proportion of from 10.0% by mass to 30.0% by mass to the ink, where the metal ion is at least one selected from an alkali metal ion and an alkaline earth metal ion, where the metal ion has a proportion of from 4000 mg/L to 8000 mg/L to the ink.

Ink, ink container, recording device, recording set and recording method

An ink set includes an ink A including water, an organic solvent A, a self-dispersible pigment, an anionic resin particle, and an amine compound having a boiling point of 120 degrees C.-200 degrees C. and an ink B including water, an organic solvent B, and a resin-coated pigment, wherein when the mass content of the amine compound is determined as 1, the mass content of the anionic resin particle is 1-100 and the mass content of the resin-coated pigment is 10-200, while the mass content of the anionic resin particle and the mass content of the resin-coated pigment are respectively based on the content per unit of mass of the ink A and the content per unit of mass of the ink B.

Provided is an ink including: a coloring material; an organic solvent; resin particles; an amine compound; and water, wherein the resin particles include urethane resin particles, and urethane-modified acrylic resin particles including a core portion containing an acrylic resin and a shell portion formed on a surface of the core portion and containing at least a urethane resin, and wherein the amine compound has a boiling point of 120 degrees C. or higher but 200 degrees C. or lower and a molecular weight of 100 or less.

Ink, ink stored container, image forming method, liquid discharging apparatus, and image

An inkjet recording method includes applying one or more drive pulses to a pressure generating device of a recording head including a nozzle plate, a liquid chamber, and discharging droplets of ink from the nozzle. Also, the following conditions 1 and 2 are satisfied. 1. The ink has a dynamic surface tension 10 mN/m or more greater than the static surface tension of the ink when the surface life length is 15 ms and 3 mN/m or more greater than the static surface tension of the ink when the surface life length is 1,500 ms, as measured by maximum bubble pressure technique at 25 degrees C. 2. At least one of the drive pulses has a voltage changing portion to draw in the ink, the voltage changing portion having a changing time of one third or more of the resonance period of the liquid chamber.

Inkjet recording method and inkjet recording device

An inkjet recording method performed by inkjet recording device including nozzle plate with nozzle to eject droplets of ink; recording head including liquid chamber with which the nozzle is in communication, and pressure-generating unit configured to generate pressure in the liquid chamber; and signal-generating unit configured to generate signal applied to the pressure-generating unit, and allowing the droplets of the ink to eject by the pressure generated by the pressure-generating unit according to the signal, wherein the ink has static surface tension of 18.0 mN/m to 27.0 mN/m at 25&#xb0; C., the ink has receding contact angle on the nozzle plate of less than 50&#xb0;, the signal has two-step pull pulse for pulling the ink into the nozzle in two-step manner within one printing unit cycle, and the method includes pulling the ink located in proximity to nozzle outlet into the nozzle of the two-step pull pulse, to form meniscus at predetermined position.

An inkjet recording method, containing: applying a stimulus to an inkjet recording ink to jet the ink, to form an image on a recording medium, wherein the ink contains water, a water-soluble organic solvent, a colorant, and a surfactant, and has a predetermined surface life time as measured by a maximum bubble pressure method and a predetermined static surface tension, wherein the recording medium contains a support, and a recording layer provided at least one surface of the support, where the recording layer contains a cationic resin in a predetermined amount, and is a medium for a concealing postcard where the recording medium is folded to bond a surface of the recording layer to face each other with an adhesive after information is recorded on the surface of the recording layer, in which the surface of the recording layer has a predetermined 10-sec Cobb size degree.

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Tokyo, Japan

Kiminori Masuda