Ricoh Company, Ltd.

Ricoh Printing Systems, Ltd.

Hitachi Printing Solutions, Ltd.

Rocoh Company, Ltd.

Shigenori Yaguchi

Hitoshi Iwatsuki

Hiroshi Hosokawa

Yasuo Suzuki

Toyoaki Tano

Koichi Sakata

Hiroyuki Kishida

Hiroshi Tohmatsu

Toyoshi Sawada

Nozomu Tamoto

Akira Saito

Kimitoshi Yamaguchi

Yasuyuki Yamashita

Junji Kobayashi

Mariko Takii

Ryuuichi Shimizu

Kiichi Kamoda

Shinzo Higuchi

Sohichiroh Iida

Tsuneaki Kawanishi

Hirobumi Ouchi

Nobuyoshi Hoshi

Saori Yamada

Kenichi Mashiko

Tomonari Hokkyo

Mitsuo Aoki

Mitsuru Naruse

Hisashi Nakajima

Masashi Nagayama

Hiroshi Ueno

Tadahiro Kaneko

Minoru Masuda

Kenji Kikuchi

Shinji Tamaki

Shunji Katoh

Hiroshi Ikeguchi

Michiharu Suzuki

Hideyuki Santo

Kazumi Ohtaki

Toshiyuki Mutoh

Yumiko Yagi

Yunsheng Sun

Sohichiroh Lida

A resin powder for solid freeform fabrication has a 50 percent cumulative volume particle diameter of from 5 to 100 μm and a ratio (Mv/Mn) of a volume average particle diameter (Mv) to the number average particle diameter (Mn) of 2.50 or less and satisfies at least one of the following conditions (1) to (3):

Resin powder for solid freeform fabrication, device for solid freeform fabrication object, and method of manufacturing solid freeform fabrication object

A resin powder for solid freeform fabrication includes a particle having a pillar-like form, wherein the ratio of the height of the particle to the diameter or the long side of the bottom of the particle is 0.5 to 2.0, the particle has a 50 percent cumulative volume particle diameter of from 5 to 200 μm, and the ratio (Mv/Mn) of the volume average particle diameter (Mv) to the number average particle diameter (Mn) of the particle is 2.00 or less.

A resin powder for solid freeform fabrication has a 50 percent cumulative volume particle diameter of from 5 to 100 &#x3bc;m and a ratio (Mv/Mn) of a volume average particle diameter (Mv) to the number average particle diameter (Mn) of 2.50 or less and satisfies at least one of the following conditions (1) to (3):

Provided are resin particles including columnar resin particles each including filaments of a fibrous material, wherein the filaments of the fibrous material are aligned in an axial direction of each of the columnar resin particles.

Resin particles, production method thereof, and application thereof for production of three-dimensional object

A resin powder contains a resin, wherein the proportion of fine powder having a number diameter of 40 percent or less of a mean number diameter Mn of the resin powder is 30 percent or less in the resin powder.

Resin powder, device for solid freeform fabrication object, and method of manufacturing solid freeform fabrication object

A resin powder for solid freeform fabrication includes a particle having a pillar-like form, wherein the ratio of the height of the particle to the diameter or the long side of the bottom of the particle is 0.5 to 2.0, the particle has a 50 percent cumulative volume particle diameter of from 5 to 200 &#x3bc;m, and the ratio (Mv/Mn) of the volume average particle diameter (Mv) to the number average particle diameter (Mn) of the particle is 2.00 or less.

Resin powder having pillar shape and specific circularity for solid freeform fabrication, device for solid freeform fabrication object, and method of manufacturing solid freeform fabrication object

A resin powder for solid freeform fabrication, having a melting point of 100 degrees C. or higher as measured according to ISO 3146 regulation and a ratio of melt mass-flow rate B to melt mass-flow rate A of greater than 0.80 to 1.20, wherein the melt mass-flow rate A and the melt mass-flow rate B are respectively measured at 15 degrees C. higher than the melting point under a load of 2.16 kg according to JIS K7210 format before and after the resin powder is maintained at a temperature 15 degrees C. lower than the melting point under a pressure of 0.1 kPa for four hours.

Resin powder for solid freeform fabrication, device for fabricating solid freeform fabrication object, and resin powder

A resin powder for solid freeform fabrication includes resin particles having a significantly pillar-like form including resin particles having a concave portion on the circumferential side surface.

Resin powder for solid freeform fabrication and device for solid freeform fabrication object

A powder material for three-dimensional modeling includes a base particle and a coverage film including an organic material. The coverage film covers the base particle. The powder material is used for three dimensional modeling and when the coverage film is dissolved in a solvent to prepare a solution and the solution is formed into a coated film on a smooth surface, the coated film has a wetting tension of from 22 mN/m to 28 mN/m.

Powder material for three-dimensional modeling, kit for three-dimensional modeling, device for manufacturing three-dimensional object, and method of manufacturing three-dimensional object

There is provided a carrier including magnetic core particles; and a coating layer on a surface of each of the magnetic core particles, wherein the coating layer contains electroconductive particles; wherein the electroconductive particles are electroconductive particles in which white inorganic pigments are coated with phosphorus-doped tin or tungsten-doped tin; and wherein a dope ratio of phosphorus or tungsten to tin in the phosphorus-doped tin or tungsten-doped tin is 0.010 to 0.100.

Carrier, two-component developer, supplemental developer, image forming method, process cartridge and image forming apparatus

A carrier for developing an electrostatic latent image of the present invention includes a core material and a coating layer which coats the core material, wherein the coating layer includes a resin and fine particles, wherein the coating layer has an average layer thickness difference of 0.02 &#x3bc;m to 3.0 &#x3bc;m, and wherein the carrier for developing an electrostatic latent image has an arithmetic mean surface roughness Ra1 of 0.5 &#x3bc;m to 0.9 &#x3bc;m.

Carrier for developing an electrostatic latent image, developer and image forming apparatus

A carrier is provided. The carrier includes a particulate magnetic core, and a cover layer located on the surface of the particulate magnetic core and including a resin and a filler. When determined from observation of cross-section of the carrier, the shape factor SF2 of the carrier is from 120 to 160, the ratio of the average domain diameter of the particulate magnetic core to the number average particle diameter of the filler is from 1:1 to 1:0.003, and the area ratio of the filler in the cover layer is from 30 to 85%.

Carrier for two-component developer, two-component developer using the carrier, and image forming method and process cartridge using the two-component developer

A replenishing developer housing container includes: a container body housing a replenishing developer; a conveying portion; a pipe receiving port; and an uplifting portion. The replenishing developer contains a toner and a carrier. The container body includes a protruding portion protruding from a container body interior side of the container opening portion toward one end of the container body and a curving portion curving so as to conform to the protruding portion. The uplifting portion includes an uplifting wall surface extending from an internal wall surface of the container body toward the protruding portion. When the replenishing developer housing container is mounted on the replenishing developer conveying device, the protruding portion is present between the curving portion and the replenishing developer receiving port of a conveying pipe being inserted.

Replenishing developer housing container and image forming apparatus

A carrier for use in a two-component developer for developing an electrostatic latent image is provided. The carrier includes a particulate magnetic core; and a cover layer located on a surface of the particulate magnetic core and including a resin and a particulate electroconductive material. The carrier has a BET specific surface area of from 0.8 to 1.6 m/g.

Carrier for two-component developer, two-component developer using the carrier, and process cartridge and image forming method and apparatus using the two component developer

A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 &#x3a9;cm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.

Carrier for developing electrostatic latent image, and electrostatic latent image developer

Growing community of inventors

Shizuoka, Japan

Shigenori Yaguchi