Abstract: A water-based ink jet ink composition contains C.I. Pigment Red 150 and at least one of 1-(2-hydroxyethyl)-2-pyrrolidone and ?-caprolactam.

Abstract: A water-based maintenance liquid is used for a recording apparatus, the recording apparatus is an apparatus to perform recording by ejecting at least two types of water-based ink compositions from an ink jet head, the ink jet head has a nozzle surface in which nozzles to eject the water-based ink compositions are formed, the nozzles are formed in the nozzle surface respectively for the at least two types of water-based ink compositions, the maintenance liquid is used to moisturize the nozzle surface by being supplied to a cap portion which covers the nozzle surface and includes water and a moisturizing agent component which contains at least one type of moisturizing agent, the moisturizing agent component is a water-soluble organic compound, and a content A (percent by mass) of the moisturizing agent component with respect to a total mass of the moisturizing agent component and the water satisfies a predetermined equation.

Abstract: A maintenance liquid is used to maintain an ink jet head of a printing apparatus configured to eject an ink for printing from the ink jet head. The maintenance liquid is aqueous and subject to detection by a conductivity-based sensor. The maintenance liquid includes at least one selected from the group consisting of inorganic alkalis and ethylenediaminetetraacetic acid compounds and at least one selected from the group consisting of organic acids and organic alkalis. The maintenance liquid has an electrical conductivity of 100 ?S/cm or more and a pH of 6.0 to 11.

Abstract: An ink set of a radiation-curable ink jet composition containing a polymerizable compound, wherein the ink set includes a color ink and a clear ink as the radiation-curable ink jet composition, the polymerizable compound contained in the clear ink contains at least one of Polymerizable monomer A1 and Polymerizable oligomer A2, Polymerizable monomer A1 having a volume of 0.26 nm3 or more and an area in the direction of the height relative to a long side of 0.25 nm2 or more that are defined by using the van-der-Waals radius, and a total content of Polymerizable monomer A1 and Polymerizable oligomer A2 contained in the clear ink is 80% by mass or more relative to a total amount of the polymerizable compound.

Abstract: An ink set of radiation curable ink jet inks each of which contains polymerizable compounds, includes a color ink and a clear ink, the polymerizable compounds contained in the clear ink include a monomer A having a hydroxy group and a monomer B having a volume of 0.26 nm3 or more and a height direction area of 0.25 nm2 or more with respect to a long side each of which is defined by the Van der Waals radii, and a total content of the monomer A and the monomer B is 80 percent by mass or more with respect to a total mass of the polymerizable compounds contained in the clear ink.

Abstract: A recording method comprises a discharging step of discharging a first ink and a second ink from a line head having a length equal to or longer than a recording width of a recording medium and allowing the inks to adhere to the recording medium, wherein the line head includes a plurality of unit heads aligned in the recording width direction of the recording medium and includes portions having different inter-nozzle distances in the scanning direction of a first nozzle that discharges the first ink and a second nozzle that discharges the second ink, and the first ink and the second ink contain color materials and inorganic oxide particles, and the color materials have compositions different from each other.

Abstract: An ink jet method records a radiation-curable ink composition containing a polymerizable compound. The radiation-curable ink composition includes a first ink composition and a second ink composition. The ink jet method includes a first discharging step of discharging the first ink composition with an ink jet head to adhere the composition to a recording medium, a first curing step of irradiating the first ink composition adhered to the recording medium with radioactive rays, a cooling step of cooling the recording medium, a second discharging step of discharging the second ink composition with the ink jet head to adhere the composition to the cooled recording medium at least in a part of the region where the first ink composition adhered; and a second curing step of irradiating the second ink composition adhered to the recording medium with radioactive rays.

Abstract: Provided is an ink set of radiation-curable ink jet compositions each including a polymerizable compound component. The ink set includes a color ink and a clear ink as the radiation-curable ink jet compositions. The polymerizable compound component contained in the clear ink includes a monomer A having a volume of 260 angstrom3 or more and an area of 25 angstrom2 or more in the height direction with respect to a long side defined by a van-der-Waals radius, and the content of the monomer A contained in the clear ink is 80 mass % or more based on the total amount of the polymerizable compound component.

Abstract: An ink set of a radiation-curable ink jet composition containing a polymerizable compound, wherein the ink set includes a color ink and a clear ink as the radiation-curable ink jet composition, the polymerizable compound contained in the clear ink contains at least one of Polymerizable monomer A1 and Polymerizable oligomer A2, Polymerizable monomer A1 having a volume of 0.26 nm3 or more and an area in the direction of the height relative to a long side of 0.25 nm2 or more that are defined by using the van-der-Waals radius, and a total content of Polymerizable monomer A1 and Polymerizable oligomer A2 contained in the clear ink is 80% by mass or more relative to a total amount of the polymerizable compound.

Abstract: An ink jet method records a radiation-curable ink composition containing a polymerizable compound. The radiation-curable ink composition includes a first ink composition and a second ink composition. The ink jet method includes a first discharging step of discharging the first ink composition with an ink jet head to adhere the composition to a recording medium, a first curing step of irradiating the first ink composition adhered to the recording medium with radioactive rays, a cooling step of cooling the recording medium, a second discharging step of discharging the second ink composition with the ink jet head to adhere the composition to the cooled recording medium at least in a part of the region where the first ink composition adhered; and a second curing step of irradiating the second ink composition adhered to the recording medium with radioactive rays.

Abstract: An ink set of radiation curable ink jet inks each of which contains polymerizable compounds, includes a color ink and a clear ink, the polymerizable compounds contained in the clear ink include a monomer A having a hydroxy group and a monomer B having a volume of 0.26 nm3 or more and a height direction area of 0.25 nm2 or more with respect to a long side each of which is defined by the Van der Waals radii, and a total content of the monomer A and the monomer B is 80 percent by mass or more with respect to a total mass of the polymerizable compounds contained in the clear ink.

Abstract: Provided is an ink set of radiation-curable ink jet compositions each including a polymerizable compound component. The ink set includes a color ink and a clear ink as the radiation-curable ink jet compositions. The polymerizable compound component contained in the clear ink includes a monomer A having a volume of 260 angstrom3 or more and an area of 25 angstrom2 or more in the height direction with respect to a long side defined by a van-der-Waals radius, and the content of the monomer A contained in the clear ink is 80 mass % or more based on the total amount of the polymerizable compound component.

Abstract: An ultraviolet curing ink can be sufficiently leveled, and attachment of, for example, dust can be prevented. In an ink-jet printer, a carriage capable of reciprocating in a scanning direction is mounted with an ink-jet head for ejecting a color ink and a clear ink and ultraviolet irradiation devices for emitting ultraviolet rays. A control unit performs control so that in the forward movement of the carriage, a color ink is ejected and applied to a medium, and in the backward movement of the carriage, ultraviolet rays are irradiated to the color ink deposited on the medium and the color ink is cured. Subsequently, the medium is fed in a feed direction, and the clear ink is ejected and applied to the surface of the cured color ink in the forward movement of the carriage. In the backward movement of the carriage, the clear ink applied to the medium is irradiated by ultraviolet rays and is cured.

Abstract: An inkjet printer includes a guide rail that faces a medium support member and extends in a scanning direction. A head device includes a carriage movable in the scanning direction along the guide rail. A printer head is mounted on the carriage and is configured to discharge an ink toward a printing medium. An ultraviolet radiation device is mounted on the carriage and is configured to output an ultraviolet radiation toward the printing medium thereby curing the ink that has adhered onto the printing medium after being discharged from the printer head. The ultraviolet radiation device is arranged in the carriage on a side of the printer head in the scanning direction. An intensity controller is configured to control an intensity of the ultraviolet radiation output from the ultraviolet radiation device depending on a direction of movement of the carriage.

Abstract: An ultraviolet curing ink can be sufficiently leveled, and attachment of, for example, dust can be prevented. In an ink-jet printer, a carriage capable of reciprocating in a scanning direction is mounted with an ink-jet head for ejecting a color ink and a clear ink and ultraviolet irradiation devices for emitting ultraviolet rays. A control unit performs control so that in the forward movement of the carriage, a color ink is ejected and applied to a medium, and in the backward movement of the carriage, ultraviolet rays are irradiated to the color ink deposited on the medium and the color ink is cured. Subsequently, the medium is fed in a feed direction, and the clear ink is ejected and applied to the surface of the cured color ink in the forward movement of the carriage. In the backward movement of the carriage, the clear ink applied to the medium is irradiated by ultraviolet rays and is cured.

Abstract: An ink jet printer includes a medium supporter to support a print medium. A print head is configured to eject ink droplets toward the print medium. An ultraviolet light irradiation device is configured to irradiate the print medium with ultraviolet light to cure ink deposited on the print medium. On a carriage, the print head and the ultraviolet light irradiation device are mounted to face the medium supporter. The carriage is reciprocally movable relative to the print medium in a first direction and movable relative to the print medium in a second direction perpendicular to the first direction. The ultraviolet light irradiation device is arranged on a side in the first direction of the print head. The print head is arranged to project toward an upstream side of a feeding direction in the second direction by a predetermined length relative to the ultraviolet light irradiation device.

Abstract: An inkjet printer including an inkjet head unit having inkjet heads for ejecting UV inks, an UVLED unit having a UVLED for emitting ultraviolet light, and a control unit for controlling the inkjet head unit and the UVLED unit. The control unit controls the inkjet head unit and the UVLED unit to move in the scanning direction, controls the inkjet heads to eject UV inks, and controls the UVLED to emit ultraviolet light of a first light quantity. After that, the control unit controls the inkjet head unit and the UVLED unit to move in the direction opposite to the scanning direction and controls the UVLED to emit ultraviolet light of a second light quantity.

Abstract: An ultraviolet curing inkjet printer includes a first ejecting device, a first ultraviolet light irradiation device, and a second ultraviolet light irradiation device. The first ultraviolet light irradiation device is configured to emit ultraviolet light of a first light quantity for temporarily curing the ultraviolet curable inks ejected from the first ejecting device. The first ultraviolet light irradiation device is disposed posterior to the first ejecting device in a first direction as a scanning direction. The second ultraviolet light irradiation device is configured to emit ultraviolet light of a second light quantity for finally curing the ultraviolet curable inks temporarily cured by the first ultraviolet light irradiation device. The second ultraviolet light irradiation device is disposed anterior to the first ejecting device in a second direction, which is perpendicular to the first direction and is a moving direction of a recording medium relative to the first ejecting device.

Abstract: An inkjet printer includes a guide rail that faces a medium support member and extends in a scanning direction. A head device includes a carriage movable in the scanning direction along the guide rail. A printer head is mounted on the carriage and is configured to discharge an ink toward a printing medium. An ultraviolet radiation device is mounted on the carriage and is configured to output an ultraviolet radiation toward the printing medium thereby curing the ink that has adhered onto the printing medium after being discharged from the printer head. The ultraviolet radiation device is arranged in the carriage on a side of the printer head in the scanning direction. An intensity controller is configured to control an intensity of the ultraviolet radiation output from the ultraviolet radiation device depending on a direction of movement of the carriage.

Abstract: An inkjet printer including a UVLED unit which emits ultraviolet light to a print medium supported on a supporting table to cure UV ink droplets deposited on the print medium. The inkjet printer further includes a controller which adjust the light quantity of ultraviolet light, emitted from the UVLED unit to the UV ink droplets deposited on the print medium, from a light quantity for temporary curing to a light quantity for final curing, and a control unit capable of selecting between a two-stage curing mode in which UV ink droplets deposited on the print medium are temporarily cured ant are then finally cured and a single-stage curing mode in which UV ink droplets are finally cured by an irradiation with ultraviolet light at one time by means of the UVLED unit and the controller.