Kyocera Document Solutions Inc.

Kyocera Mita Corporation

Yasuko Takaori

Noriaki Ozawa

Noriaki Furukawa

Susumu Hiroshima

Takashi Somete

Masato Usui

Toyotsune Inoue

An inkjet ink contains a pigment, resin particles, dipropylene glycol monomethyl ether, triethylene glycol monobutyl ether, and propylene glycol. The resin particles contain polycarbonate polyurethane resin. The resin particles have a percentage content of at least 2.0% by mass and no greater than 9.0% by mass. The dipropylene glycol monomethyl ether has a percentage content of at least 7.0% by mass and no greater than 27.0% by mass. The triethylene glycol monobutyl ether has a percentage content of at least 4.0% by mass and no greater than 12.0% by mass. The propylene glycol has a percentage content of at least 4.0% by mass and no greater than 18.0% by mass.

Inkjet ink

An ink set includes an inkjet ink and a recording head filling liquid. The inkjet ink includes a pigment, a pigment coating resin, a first alkali metal ion, and water. The recording head filling liquid includes polyethylene glycol, a second alkali metal ion, a surfactant, and water. The polyethylene glycol has a mass average molecular weight of at least 180 and no greater than 800. A content ratio of the surfactant in the recording head filling liquid is greater than 0.00% by mass and no greater than 0.10% by mass. The first and second alkali metal ions each contain at least one of Li, Na, and K.

Ink set and recording head testing method

A recording head recovery system includes a recording head, a cleaning liquid tank for storing cleaning liquid, a cleaning liquid supplying path which connects together the cleaning liquid tank and the recording head, a liquid supply mechanism which is provided in the cleaning liquid supplying path, and a controller. The controller performs recording head recovery operation including cleaning liquid supplying operation for supplying the cleaning liquid from liquid supplying openings of the recording head, wiping operation for wiping an ink ejection face of the recording head while a wiper retains the cleaning liquid, and backflow operation for controlling the liquid supply mechanism to make the cleaning liquid in the cleaning liquid supplying path to flow from the cleaning liquid supplying openings to the cleaning liquid tank.

Recording head recovery system, ink-jet recording apparatus therewith, and recording head recovery method

A wash fluid for use in an inkjet recording apparatus contains water, a coconut oil fatty acid surfactant, an organic deliquescent agent, a polyhydric alcohol, and a basic inorganic compound. The polyhydric alcohol is an alkanediol. The coconut oil fatty acid surfactant is contained in an amount of at least 0.01% by mass and no greater than 3.00% by mass. The organic deliquescent agent is contained in an amount of at least 0.10% by mass and no greater than 30.00% by mass.

Wash fluid for use in inkjet recording apparatus and image formation method

A method for recovery of a recording head includes cleaning liquid supplying operation, wiping operation, and backflow operation. The recording head is connected to a cleaning liquid tank for storing cleaning liquid via a cleaning liquid supplying path. In the backflow operation, a liquid supply mechanism makes the cleaning liquid in the cleaning liquid supplying path to flow backward in a direction pointing from the cleaning liquid supplying openings to the cleaning liquid tank. The recording head includes an ink ejection region in which ink ejection openings are open, and a cleaning liquid supplying region which is arranged upstream of the ink ejection region in a wiping direction and in which cleaning liquid supplying openings are open. The backflow operation is performed after a wiper passes the cleaning liquid supplying region and before the wiper reaches the ink ejection region.

Recording head recovery method

A water-based cleaning liquid for inkjet recording apparatus use contains at least 0.10% by mass and no greater than 10.00% by mass of a nonionic surfactant, at least 0.50% by mass and no greater than 30.00% by mass of a deliquescent agent, and a pH adjuster. The nonionic surfactant contains polyoxyalkylene alkylamine. The deliquescent agent includes at least one of sorbitol, trimethylolpropane, and 1,3-bis(2-hydroxyethyl)-5,5-dimethylhydantoin. The pH adjuster includes an alkali metal salt. The water-based cleaning liquid for inkjet recording apparatus use has a pH of at least 7.5 and no greater than 8.5.

Water-based cleaning liquid for inkjet recording apparatus use and cleaning method

An ink set includes a water-based ink and a water-based cleaning liquid. The water-based ink and the water-based cleaning liquid each contain at least 1.0% by mass and no greater than 4.0% by mass of a deliquescent agent. The water-based cleaning liquid further contains a nonionic surfactant and a diol. The deliquescent agent that the water-based ink contains and the deliquescent agent that the water-based cleaning liquid contains each include at least one of sorbitol, trimethylolpropane, and 1,3-bis(2-hydroxyethyl)-5,5-dimethylhydantoin. The nonionic surfactant has an HLB value determined by Griffin method of at least 14 and no greater than 16. The diol includes at least one of triethylene glycol and 1,3-propanediol.

Ink set for inkjet recording, cartridge, and image forming method

An ink for ink-jet recording apparatuses includes water, a pigment dispersion, an organic solvent, and a humectant. The pigment dispersion includes a pigment and a resin having a weight average molecular weight of from 35,000 to 140,000. An adsorbed resin proportion determined from the mass of a total amount of resin in the ink and the amount of resin separated from pigment among the resin is at least 0.97. And, the ink contains from 3% to 15% by mass of C1-C4 monoalkyl ether of polyhydric alcohol based on the mass of the ink as the organic solvent.

Ink for ink-jet recording apparatuses and image forming method

An ink for an ink-jet recording apparatus contains water, a pigment, a resin, 1,3-propanediol, and an organic solvent. The resin has a weight-average molecular weight of 30,000 to 150,000. The content of the resin is 1.5% to 6.0% by mass with respect to the mass of the ink. The total content (P+Q) of the content of the glycerol (P) and the content of the 1,3-propanediol (Q) in the ink is 15% to 40% by mass with respect to the mass of the ink. The mass ratio (P/Q) is 0.25 to 1.00.

Ink for ink-jet recording apparatus and method for forming image

An inkjet recording apparatus according to one aspect of the present disclosure includes nozzle, pressuring chambers, piezoelectric element, ambient condition obtaining portion, application portion, and control portion. Control portion causes application portion to output ejection driving-voltage by which piezoelectric element is deformed so as to eject droplets from nozzles in printing period in printing state, and causes application portion to output vibration driving-voltage by which piezoelectric element is vibrated so as to vibrate meniscus in each nozzle in non-printing period between printing periods in printing state. Control portion changes the number of times piezoelectric element is vibrated in non-printing period, based on ambient condition obtained by ambient condition obtaining portion, or zero shear viscosity of ink which is calculated or obtained according to obtained ambient condition, and causes application portion to output vibration driving-voltage by which piezoelectric element is vibrated the number of times having been changed.

Inkjet recording apparatus

An ink for ink-jet recording apparatuses, includes water, a pigment dispersion, and a super-penetrating agent and a high SP organic solvent respectively having a predetermined solubility parameter (SP value). All of differences (&#x394;SPs) between SP values of the neighboring organic solvents are from 0.5 to 5.0 in order of SP values thereof, and the difference of SP&#x2212;SPis 12 or less in which SPis the highest SP value of an organic solvent among organic solvents in the high SP organic solvent and SPis the smallest SP value of an organic solvent among organic solvents in the super-penetrating agent.

An ink for an ink-jet recording apparatus contains at least water, a pigment dispersion, and a penetrating agent. The pigment dispersion contains a resin having a molecular weight of about 60,000 or more and about 150,000 or less. The ink for an ink-jet recording apparatus contains an alkanediol having 8 or 9 carbon atoms as the penetrating agent. The content of the alkanediol is about 0.2% by mass or more relative to the total mass of the ink.

Ink for ink-jet recording apparatus

A process for forming an image by using an inkjet recording apparatus including printing by using two or more kinds of inks each containing a pigment dispersion containing a pigment and a resin, an organic solvent and water, wherein the printing is conducted by ejecting the inks each having a particle size-change constant within a prescribed range from recording heads in the increasing order of the particle size-change constants, wherein each particle size-change constant is obtained by a prescribed process from the average particle diameters of the pigment included in each ink at mass drying rates in the range of 10 to 40%.

Process for forming image by ink jet recording apparatus

The present invention provides an inkjet recording processing liquid for use in an inkjet recording method of causing a processing liquid to adhere to a recording medium and thereafter causing ink to adhere to the recording medium to which the processing liquid has adhered. The inkjet recording processing liquid contains water, glycerin, and at least one multivalent metal salt selected from the group consisting of calcium nitrate and magnesium nitrate. The glycerin content in the processing liquid is 10 to 50 mass percent, and the multivalent metal salt content in the processing liquid is 0.8 to 2.0 mol/L.

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Osaka, Japan

Yasuko Takaori