Abstract: An ink jet recording method uses an ink jet recording apparatus including a plurality of heads arranged in parallel in a first direction, each of which ejects droplets of a different radiation-curable ink composition onto a recording medium, and first light sources provided for corresponding heads so as to be disposed at a predetermined side of the corresponding heads. The first light sources emit active radiation to irradiate the droplets on the recording medium. The method includes ejecting droplets of the ink compositions from the heads onto the recording medium, and performing a first irradiation by irradiating the droplets of each ink composition with the active radiation from the corresponding first light source at an irradiation energy within 500 ms after the droplets have landed. The irradiation energy is in the range of 5% to 10% of the energy E90 at which the ink composition is 90% cured.

Abstract: An ink composition has a viscosity of 25 mPa·s to 35 mPa·s at 20° C., wherein a, b, and c are 800 or more, 7.4 to 14, and 0.16 to 0.22, respectively, when a cylindrical portion is formed by expanding the ink composition so as to have a free surface parallel to the expanding direction of the ink composition, the rate of change in width of the cylindrical portion with time is measured in the expanding direction thereof, and the rate of change in width of the cylindrical portion with time is fit to a quadratic function given by the following equation: S=?at2?bt+c??(1) where S is the rate of change in width of the cylindrical portion and t is the time in seconds.

Abstract: An ink composition for ultraviolet curable ink jets including monomer A represented by a general formula (I): CH2?CR1—COOR2—O—CH?CH—R3??(I) (in the formula, ‘R1’ represents a hydrogen atom or methyl group, ‘R2’ represents a divalent organic residue having a carbon number of 2 to 20, and ‘R3’ represents a hydrogen atom or a monovalent organic residue having a carbon number of 1 to 11), and a photopolymerization initiator containing an acylphosphine oxide-based photopolymerization initiator and a thioxanthone-based photopolymerization initiator, in which the total content of the acylphosphine oxide-based photopolymerization initiator and the thioxanthone-based photopolymerization initiator is 8% by mass to 16% by mass with respect to the total mass of the ink composition.

Abstract: A carriage apparatus of an ink jet recording apparatus, which discharges a photocurable ink and photocures the discharged ink, thereby forming a desired image on the recording medium, includes a plurality of recording heads for discharging the ink with respect to the recording medium; a recording carriage on which the plurality of recording heads is mounted so as to be divided into a plurality of recording portions; a plurality of photocuring units which is disposed to photocure the ink on the recording medium; and a photocuring carriage on which a plurality of photocuring units is mounted and which is disposed in a plane with a gap between the photocuring carriage and the recording carriage, wherein, in the photocurable carriage, a plurality of holding portions for holding the respective photocuring units forms a narrow part, respectively and is connected with each other.

Abstract: Provided is a support device that supports easier data exchange between PLCs without relying on a type of a PLC of the other communication party. The support device includes: a first input unit for receiving information defining, on a data-by-data basis, variables for data handled by the first programmable logic controller; a second input unit for receiving a source program expressing processing executed on the first programmable logic controller using the defined variables; a third input unit for receiving information that identifies a type of a second programmable logic controller in association with a first variable; and a generation unit that generates the executable program using the information defining the variables and the source program. The generation unit adapts a data structure of first data secured in the memory in correspondence with the first variable in accordance with the type of the second programmable logic controller.

Abstract: A radiation-curable ink composition includes an acrylate monomer of which homopolymer has a glass transition temperature of not higher than 0° C. in an amount of 20% by mass or more and 65% by mass or less based on the total amount of reaction components; a monofunctional acrylate having an alicyclic structure; and a multifunctional acrylate having an alicyclic structure.

Abstract: An ink composition has a viscosity of 25 mPa·s to 35 mPa·s at 20° C., wherein a, b, and c are 800 or more, 7.4 to 14, and 0.16 to 0.22, respectively, when a cylindrical portion is formed by expanding the ink composition so as to have a free surface parallel to the expanding direction of the ink composition, the rate of change in width of the cylindrical portion with time is measured in the expanding direction thereof, and the rate of change in width of the cylindrical portion with time is fit to a quadratic function given by the following equation: S=?at2?bt+c??(1) where S is the rate of change in width of the cylindrical portion and t is the time in seconds.

Abstract: An ink composition has a viscosity of 25 mPa·s to 35 mPa·s at 20° C., wherein a, b, and c are 800 or more, 7.4 to 14, and 0.16 to 0.22, respectively, when a cylindrical portion is formed by expanding the ink composition so as to have a free surface parallel to the expanding direction of the ink composition, the rate of change in width of the cylindrical portion with time is measured in the expanding direction thereof, and the rate of change in width of the cylindrical portion with time is fit to a quadratic function given by the following equation: S=?at2?bt+c??(1) where S is the rate of change in width of the cylindrical portion and t is the time in seconds.

Abstract: Provided are a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, multifunctional acrylate (B) in an amount of from 20 to 50 mass % of the total reaction components, and a black pigment (F1); and a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction-components, a multifunctional acrylate (B) in an amount of from 10 to 50 mass % of the total reaction components, and a yellow pigment (F2).

Abstract: Provided are a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 20 to 50 mass % of the total reaction components, and a black pigment (F1); and a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 10 to 50 mass % of the total reaction components, and a yellow pigment (F2).

Abstract: An ink jet recording method uses an ink jet recording apparatus including a plurality of heads arranged in parallel in a first direction, each of which ejects droplets of a different radiation-curable ink composition onto a recording medium, and first light sources provided for corresponding heads so as to be disposed at a predetermined side of the corresponding heads. The first light sources emit active radiation to irradiate the droplets on the recording medium. The method includes ejecting droplets of the ink compositions from the heads onto the recording medium, and performing a first irradiation by irradiating the droplets of each ink composition with the active radiation from the corresponding first light source at an irradiation energy within 500 ms after the droplets have landed. The irradiation energy is in the range of 5% to 10% of the energy E90 at which the ink composition is 90% cured.

Abstract: An image forming method, including: a first process for ejecting liquid droplets of a radiation curable ink composition onto a recording medium from an ejection head capable of ejecting the radiation curable ink composition using an ink jet recording device; and a second process for irradiating the liquid droplets with active radiation by an irradiation measure capable of emitting the active radiation, in which, among the liquid droplets of the radiation curable ink composition irradiated with the active radiation, a difference of the total irradiation energy of a liquid droplet having the highest total irradiation energy of the active radiation and a liquid droplet having the lowest total irradiation energy of the active radiation in the second process is 30% or more and 50% or lower of the irradiation energy (E90) [mJ/cm2] required for curing 90% of the radiation curable ink composition.

Abstract: A radiation-curable ink composition contains (A) aminoacrylate at 1 mass % to 10 mass %, inclusive, (B) phenoxyethyl acrylate at 20 mass % to 50 mass %, inclusive, and (C) tetraethylene glycol diacrylate at 1 mass % to 20 mass %, inclusive, in its reaction component, as well as (E) bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide at 3 parts by mass to 8 parts by mass, inclusive, (F) 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at 3 parts by mass to 5 parts by mass, inclusive, in 100 parts by mass of the reaction component, and (G) diethylthioxanthone at 1 part by mass to 3 parts by mass, inclusive, in 100 parts by mass of the reaction component.

Abstract: An ink jet recording method uses an ink jet recording apparatus including a plurality of heads arranged in parallel in a first direction, each of which ejects droplets of a different radiation-curable ink composition onto a recording medium, and first light sources provided for corresponding heads so as to be disposed at a predetermined side of the corresponding heads. The first light sources emit active radiation to irradiate the droplets on the recording medium. The method includes ejecting droplets of the ink compositions from the heads onto the recording medium, and performing a first irradiation by irradiating the droplets of each ink composition with the active radiation from the corresponding first light source at an irradiation energy within 500 ms after the droplets have landed. The irradiation energy is in the range of 5% to 10% of the energy E90 at which the ink composition is 90% cured.

Abstract: There is provided a printing apparatus including: a transport unit which transports a medium in a transport direction, a first head, a first light source which is provided further to the downstream side in the transport direction than the first head, a second head which is provided further to the downstream side in the transport direction than the first head and the first light source, and a second light source which is provided further to the downstream side in the transport direction than the second head and which irradiates light with a stronger irradiation energy than the irradiation energy of the first light source, in which the first head ejects ink of one color of any among magenta ink, cyan ink, and black ink onto a medium, and the second head ejects yellow ink onto the medium.

Abstract: An active light-curable ink composition contains a polymerizable compound, a color material having an absorption peak in a wavelength region, and a polymerization initiator having an absorption peak in a different wavelength region from the color material.

Abstract: Provided are a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 20 to 50 mass % of the total reaction components, and a black pigment (F1); and a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 10 to 50 mass % of the total reaction components, and a yellow pigment (F2).

Abstract: Provided are a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 20 to 50 mass % of the total reaction components, and a black pigment (F1); and a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 10 to 50 mass % of the total reaction components, and a yellow pigment (F2).

Abstract: An ink composition for ultraviolet curable ink jets including monomer A represented by a general formula (I): CH2?CR1—COOR2—O—CH?CH—R3??(I) (in the formula, ‘R1’ represents a hydrogen atom or methyl group, ‘R2’ represents a divalent organic residue having a carbon number of 2 to 20, and ‘R3’ represents a hydrogen atom or a monovalent organic residue having a carbon number of 1 to 11), and a photopolymerization initiator containing an acylphosphine oxide-based photopolymerization initiator and a thioxanthone-based photopolymerization initiator, in which the total content of the acylphosphine oxide-based photopolymerization initiator and the thioxanthone-based photopolymerization initiator is 8% by mass to 16% by mass with respect to the total mass of the ink composition.

Abstract: A liquid developer includes an insulation liquid containing a fatty acid monoester and toner particles comprised of a resin material. The resin material is characterized in that a weight-average molecular weight Mw of the resin material is in the range of 20,000 to 200,000, and an amount of a component of which molecular weight M is 10,000 or less contained in the resin material is in the range of 5 to 40 wt %. The liquid developer described above is harmless to the environment. Further, the liquid developer also has superior preservability or storage stability and superior fixing characteristics at a low temperature. An image forming apparatus that can suitably use such a liquid developer is also provided.