Konica Corporation

Konica-minolta Holdings, Inc.

Konica Minolta, Inc.

Konica Minolta Medical and Graphic, Inc.

Satoshi Masumi

Tetsu Sekine

Toshiyuki Takabayashi

Takashi Hasebe

Shuta Hamada

Shun Takada

Saburo Shimizu

Daisuke Ishibashi

Atsushi Nakajima

Shigeo Tanaka

Yoshiyuki Suzuki

Takeo Arai

Masashi Ikeda

Akio Maeda

Yoko Hirai

Yasuhiro Matsui

Koji Matsushima

Ai Kondo

Yuka Yazaki

Takashi Iwata

The purpose of the present invention is to provide: an active ray-curable inkjet ink which has good dispersion stability during storage, good surface smoothness when ejected on a recording medium, and does not undergo the bleeding of a fatty acid onto the surface of the ink; and an image formation method using the active ray-curable inkjet ink. The purpose can be achieved by an active ray-curable inkjet ink which contains: a photopolymerizable compound; at least one wax in the total mass of 1 to 8 mass % relative to the whole mass of the ink; and a fatty acid in the total mass of 0.0001 to 0.10 mass % relative to the whole mass of the wax.

Active ray-curable inkjet ink, and image formation method using same

An object of the invention is to provide an inkjet printer that forms an image with good quality. The object is achieved by an inkjet printerincluding an ink head H ejecting an ink, an ink supply unit P communicating with the ink head H, and an ink storage unit T communicating with the ink supply unit P and supplying the ink to the ink head H through the ink supply unit P, in which at least a part of the ink supply unit P has an ink heating unit S that heats the ink until a viscosity of the ink is within the range of 5 mPa&#xb7;s or more to 30 mPa&#xb7;s or less, and the ink storage unit T has a shearing device that shears the ink.

Inkjet printer and image formation method

Provided is a photocurable inkjet ink including a curable monomer, a photopolymerization initiator, a gelling agent, a colorant, and a curable oligomer. The photocurable inkjet ink is characterized in that the curable oligomer has from two to twenty functional groups, that the glass transition temperature thereof is 40.degree. C. or higher, and that the curable oligomer content is from 2 to 20% by mass relative to the mass of the ink as a whole.

Photocurable inkjet and image forming method using same

Provided is an actinic radiation-curable inkjet ink that undergoes sol-gel phase transfer and contains a dye, a gelling agent, a photopolymerization compound and a photopolymerization initiator. The actinic radiation-curable inkjet ink includes a photopolymerizable compound A, which is a (meth)acrylate having hydroxyl groups; a photopolymerizable compound B, which is a (meth)acrylate compound having a molecular weight within a range of 300 to 1,500 and an intramolecular structure (&#x2014;CH&#x2014;CH&#x2014;O&#x2014;)(where m is an integer between 3 and 14); and a (meth)acrylate compound C, which has a molecular weight within a range of 280 to 1,500 and a C log P value within a range of 4 to 7. The ink contains, in terms of the mass of the entire ink, 1 to 15 mass % of photopolymerizable compound A, 30 to 70 mass % of photopolymerizable compound B, 10 to 40 mass % of photopolymerizable compound C, and 2 to 10 mass % of gelling agent.

Actinic radiation-curable inkjet ink and image forming method using same

Disclosed is an ink-jet printer ejecting an ink comprising a cationic-polymerizable compound onto a recording medium, wherein the ink-jet printer comprises ink-contact members which constitute an ink tank retaining the ink and an ink jet supply passage of from the ink tank to a recording head ejecting the ink and the ink-contact members are each comprised of a material which does substantially not undergo electron transfer with the ink.

Ink-jet printer and image forming method

An actinic ray curable composition containing a phthalocyanine pigment or a carbon black pigment; a dispersant; a cationically polymerizable monomer; a photo acid generator; and a phthalocyanine derivative.

Actinic ray curable composition, image forming method using the same and ink-jet recording apparatus using the same

In an image recording apparatus equipped with plural printing heads each for jetting ink drops having a photo-setting property towards a recording medium, a conveyance unit for conveying the recording medium to the printing heads, and each of plural light radiation devices for radiating light to the ink drops landed on the recording medium to harden, is arranged at the downstream side of each of the plural printing heads, one having largest light energy, which is located at the most downstream position among the plural light radiation devices is determined at least to satisfy the light energy necessary for hardening of the ink drops jetted by any one of the printing heads positioned upstream thereof, and the light energy becomes smaller gradually for every light radiation device in the order from the light radiation device at the most downstream position to those at more upstream positions.

Image forming apparatus having a plurality of printing heads

An image recording device, comprises: a recording head which discharges an ultraviolet-ray curable ink, which is cured as irradiated with ultraviolet rays; an ultraviolet light source which generates ultraviolet rays to cure the ultraviolet-ray curable ink; a first heating section which heats the ultraviolet-ray curable ink on a recording medium after an irradiation of the ultraviolet rays; a pressure section which pressurizes the recording medium after an irradiation of the ultraviolet rays; and a controller which controls the first heating section to start heating the ultraviolet-ray curable ink on the recording medium after the last discharge of the ink to an arbitrary area on the recording medium, a first predetermined time between the last discharge and the starting heat is predetermined, and controls the first heating section to heat the ultraviolet-ray curable ink within a second predetermined time.

Image recording device

An image printing apparatus including a conveyance-printing section for printing on a recording medium sheet; a first printing device including a plurality of black printing heads for jetting image-setting black ink drops onto the recording medium sheet; a second printing device including a plurality of color printing heads for jetting image-setting color ink drops onto the recording medium sheet; first light radiating devices which radiate ultraviolet rays to harden the image-setting black ink drops; and second light radiating devices which radiate the ultraviolet rays to harden the image-setting color ink drops.

Image recording apparatus

An active ray curable ink-jet ink composition comprising: (i) a colorant; and (ii) a set of (I) or a set of (II), wherein the set of (I) contains: (a) a photopolymerizable alicyclic epoxy compound; and (b) a diol compound contained in a specific amount; and the set of (II) contains: (a) a photopolymerizable oxetane compound; (b) a photopolymerizable epoxy compound; and (c) a diol compound contained in a specific amount.

Active ray curable ink-jet composition, image forming method using the same, and ink-jet recording apparatus

A photocurable ink for ink-jet printing, including: a photopolymerizable compound; a pigment; and a dispersing agent, wherein the photopolymerizable compound is a radical polymerizable compound; an amine value of the pigment (AMp) is larger than an acid value of the pigment (ACp); and an acid value of the dispersing agent (ACd) is larger than an amine value of the dispersing agent (AMd).

Photocurable ink-jet ink, ink-jet image forming method and ink-jet recording apparatus using the same

There is provided an image recording device which is compact, high in image recording efficiency, low in power consumption, and capable of recording a good image even on a recording medium made of a heat shrinkable material. In an image recording devicewhich records an image on a recording mediumby irradiating it with ultraviolet rays by an ultraviolet-ray irradiation deviceto cure an ink, an ultraviolet light source comprises a light emitting diode which generates ultraviolet rays having an emission wavelength peak in a range between 305 and 375 nm and a maximum illuminance in a range between 40 and 1000 mW/cmon a surface of the recording medium.

Device and method for recording images

An inkjet printer for recording an image on a recording medium with an active ray cure ink to be cured by exposure to an active ray, having a head for emitting the active ray cure ink onto a recording medium, an active ray source for emitting the active ray wherein the active ray source is arranged at the rear of the head in the direction of a relative movement of the head with respect to the recording medium during emission of ink, and in a same side where the head is provided with respect to the recording medium, and a shield member for preventing the active ray emitted by the active ray source from directly or indirectly entering into a trajectory formed by an ink particle emitted from the head and reaching the recording medium.

Inkjet printer having an active ray source

A direct positive silver halide photographic light sensitive material is disclosed, having yellow, magenta and cyan image forming units, wherein at least one of the color image forming units contains at least two internal latent image forming silver halide emulsions which are different in a factor of contribution to image formation, a silver halide emulsion having a lower factor of contribution to image formation having a part common to sensitivity of a silver silver halide emulsion contained in one of the other two image forming units, and the photographic material is subjected to exposure, based on digitized image information.

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Odawara, Japan

Satoshi Masumi