Ricoh Company, Ltd.

Mie Yoshino

Noriyasu Takeuchi

Tsutomu Sasaki

Yusuke Takeda

Tsuneo Kurotori

Tohru Nakano

Shizuka Kohzuki

Makoto Obu

Manabu Arita

Takao Hiraoka

Takeo Tsukamoto

Masahiko Itaya

Masahide Yamashita

Yasuo Katano

Hiroki Kobayashi

Katsuaki Miyawaki

Hideki Kosugi

Seiichi Miyakawa

Sadayuki Iwai

Yuichi Aoyama

Masami Hiramatsu

Eishu Ohdake

A method of manufacturing a laminar object includes discharging an active energy ray curable ink A, irradiating the active energy ray curable ink A with active energy rays, discharging an active energy ray curable ink B, and irradiating the active energy ray curable ink B with the active energy rays, wherein the amount of the active energy rays per pass is greater in the irradiating of the active energy ray curable ink A than that in the irradiating of the active energy ray curable ink B, wherein a surface roughness Sq1 of solid printed matter having a thickness of 40 &#x3bc;m obtained in the discharging and the irradiating of the active energy ray curable ink A is 1.5 times or more than a surface roughness Sq2 of solid printed matter having a thickness of 40 &#x3bc;m obtained in the discharging and irradiating of the active energy ray curable ink B.

Method of manufacturing laminar object and active energy ray curable ink

In accordance with some embodiments of the present invention, an active energy ray curable composition including a polymerizable compound composition is provided. When the active energy ray curable composition is formed into a film having an average thickness of 10 &#x3bc;m on a substrate and, after a lapse of 15 seconds, the film is irradiated with an active energy ray having a light quantity of 1,500 mJ/cmto become a cured product, the cured product satisfies the following conditions (1) and (2):

Active energy ray curable composition, active energy ray curable ink, inkjet ink, stereoscopic modeling material, active energy ray curable composition container, inkjet recording method, two-dimensional or three-dimensional image forming apparatus, cured product, and processed product

In accordance with sonic embodiments of the present invention, an active energy ray curable composition including a polymerizable compound composition is provided. When the active energy ray curable composition is formed into a film having an average thickness of 10 &#x3bc;m on a substrate and, after a lapse of 15 seconds, the film is irradiated with an active energy ray having a light quantity of 1,500 mJ/cmto become a cured product, the cured product satisfies the following conditions (1) and (2):

An active energy ray curable composition including a polymerizable compound is provided. When a three-layer cured product of the active energy ray composition is obtained by a specific procedure, the three-layer cured product has (1) a stretchability of 1.1 or more and (2) a glass transition temperature of 50&#xb0; C. or more. The stretchability is defined by a ratio L/L, wherein Lrepresents a first length of the cured product before a tensile test and Lrepresents a second length of the cured product after the tensile test. The tensile test includes stretching the cured product along with the substrate with a tensile tester at a stretching speed of 20 mm/min and a temperature of 180&#xb0; C.

Active energy ray curable composition, ink, inkjet ink, method for producing cured product, apparatus for producing cured product, composition storage container, cured product, and processed product

An active energy ray curable composition is provided. The active energy ray curable composition includes polymerizable compounds including a first monofunctional monomer having a polar group, a second monofunctional monomer having no polar group, and a polyfunctional monomer. The homopolymer of each of the first monofunctional monomer and the second monofunctional monomer has a glass transition temperature of 50&#xb0; C. or more. The first monofunctional monomer and the second monofunctional monomer account for 50% by mass or more of the polymerizable compounds in total, and the polyfunctional monomer accounts for 30% by mass or less of the polymerizable compounds.

Active energy ray curable composition, stereoscopic modeling material, active energy ray curable ink, inkjet ink, active energy ray curable composition container, two-dimensional or three-dimensional image forming apparatus, two-dimensional or three-dimensional image forming method, cured product, and processed product

Provided is an active energy ray-curable inkjet ink containing at least photopolymerizable compounds. The photopolymerizable compounds include: at least one monofunctional monomer selected from the group consisting of a monofunctional monomer of which homopolymer has a glass transition temperature of 90&#xb0; C. or higher, a monofunctional monomer having a ring structure, and a monofunctional monomer of which homopolymer has a glass transition temperature of 90&#xb0; C. or higher and that has a ring structure; and urethane (meth)acrylate.

Active energy ray-curable inkjet ink, ink container, and inkjet discharging device

An active energy ray-curable ink which contains: polymerizable compounds containing a monofunctional polymerizable monomer a homopolymer of which has Tg of 90&#xb0; C. or higher, wherein a cured product obtained by forming a coating film having an average thickness of 10 &#x3bc;m on a polycarbonate substrate using the ink, and 15 seconds later, and applying active energy rays having a light quantity of 1,500 mJ/cmto the coating film to cure satisfies the following (1) and (2): (1) a stretchability of the cured product represented by the following equation is 2 or greater, when the cured product is stretched by a tensile tester at a tensile speed of 20 mm/min, and temperature of 180&#xb0; C., andStretchability=(length after tensile test)/(length before tensile test)(2) adhesion between the substrate and the cured product as measured by a cross-cut test in accordance with JIS K5400 is 70 or greater.

Active energy ray-curable ink, ink cartridge containing ink, image or cured product forming method, and image or cured product forming device

An active energy ray-curable ink which contains: polymerizable compounds containing a monofunctional polymerizable monomer a homopolymer of which has Tg of 90&#xb0; C. or higher, wherein a cured product obtained by forming a coating film having an average thickness of 10 &#x3bc;m on a polycarbonate substrate using the ink, and 15 seconds later, and applying active energy rays having a light quantity of 1,500 mJ/cmto the coating film to cure satisfies the following (1) and (2):

An electrophotographic image forming apparatus including an image bearing member which is a rotatable photoconductor containing an organic photoconductive layer on a conductive cylindrical support, a latent electrostatic image forming unit configured to charge the image bearing member to form a latent electrostatic image thereon, and a developing unit configured to develop the latent electrostatic image on the image bearing member with a developer to form a visible image, wherein the thickness of the organic photoconductive layer monotonically decreases or increases along the rotational axis from one end to the other end, wherein the developing unit includes a development sleeve for bearing and transferring the developer to a developing region, and wherein a development gap is formed between the image bearing member and the development sleeve, and becomes narrower from one end where the organic photoconductive layer is thicker to the other end where the organic photoconductive layer is thinner.

Image forming apparatus and process cartridge

A developing unit includes a developing roller including a roller portion. The developing roller is rotatable while carrying a developing liquid on the roller portion. The developing unit also includes a voltage applying device that applies a voltage to the roller portion to form an electric field for development between the roller portion and an image carrier, whereby the developing liquid deposited on the roller portion is transferred to a latent image formed on the image carrier. The roller portion includes a volume resistivity ranging from 0 &#x3a9;&#xb7;cm to 10&#x3a9;&#xb7;cm.

Developing unit using a developing liquid and image forming apparatus including the same

An image forming apparatus configured to use a highly viscous, dense developing liquid including a carrier liquid and toner. The apparatus includes a developing unit with a developer carrier and a coating member for coating the developing liquid on the developer carrier. The developer carrier conveys the liquid to a developing zone where it faces an image carrier to develop a latent image on the image carrier. In the developing zone, the toner is caused to move toward the image by electrophoresis to form a toner layer in which the toner is present in the carrier liquid and a carrier layer in which the toner is absent. When the developer carrier and image carrier are moved from each other, the toner moves toward the image such that the developing liquid separates at the boundary between the toner and carrier layers.

Image forming apparatus using a developing liquid

An excess toner removal area is made broader over the whole area with respect to a developer applied area that is broader than an image effective area. Thereby a liquid developer, that tends to spread slightly broader than the applied area after being applied to a photoreceptor drum, is removed by a sweep roller that can sweep excess toner present in an area broader than the original applied area and an excess toner remaining area is then prevented from being formed on the photoreceptor drum. Accordingly, the excess toner on the latent image carrier is removed as much as possible, and a transfer medium and peripheral members are prevented from being soiled due to residual excess toner.

Liquid image formation apparatus and liquid developing device

A removal nip having a predetermined width is formed by a sweep roller pressurizing mechanism, which adjusts the length of a tension spring by rotating an adjustment screw, and adjusting the size of an energizing force of a sweep roller with respect to a photosensitive drum. A pressurizing mechanism similar to the sweep roller pressurizing mechanism is also provided in a developing roller, to adjust the energizing force of the developing roller, to thereby form a developing nip having a predetermined width.

Image forming apparatus with adjustable removal and developing nips

A device for coating a developing liquid included in an developing device of the present invention includes a coating member rotatable with the developing liquid deposited thereon in a preselected amount. An intermediate member has a surface contacting the surface of the coating member and is movable at the same speed and in the same direction as the surface of the coating member. Also, the surface of the intermediate member contacts the surface of a developing roller to be coated with the developing liquid and is movable in the opposite direction to the surface of the developing roller.

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Kanagawa, Japan

Mie Yoshino