Ricoh Company, Ltd.

Tohoku Ricoh Co., Ltd.

Yukitaka Watarai

Tsutomu Maekawa

Koji Katsuragi

Atsufumi Hanazawa

Takashi Tamai

Dongsik Jang

Satoshi Takahashi

Hiroshi Goto

Tomohiro Nakagawa

Hiroshi Gotou

Yoshiki Yanagawa

Akira Saito

Hidefumi Nagashima

Koji Nagai

Yoshiyuki Shishido

Hiroyuki Hiratsuka

Yusuke Nemoto

Yoshio Ota

Kouji Ono

Yoshihiko Kudoh

Susumu Shirauchi

Shin-ichi Shoji

A liquid composition includes an inorganic particle and a multivalent metal salt, wherein the liquid composition has a tacking force of 50 mN or less in an area of cast-coated paper where the liquid composition is applied in an amount of 0.12 mg/cmfor the cast-coated paper followed by heating at 80 degrees C. for 15 seconds.

Liquid composition, device for applying liquid composition, image forming device, and image forming method

An ink and processing liquid set contains a processing liquid to be applied to a recording medium, the processing liquid including a multivalent metal salt and an ink to be applied to an area of the recording medium where the processing liquid has been applied, the ink including a urethane resin, a styrene-acrylic resin, and a pigment, wherein the following relations are satisfied: 0.5&#x2264;B/C&#x2264;0.7, where B represents a static surface tension of the ink and C represents a static surface tension of the processing liquid; and 0.5&#x2264;E/D&#x2264;0.9, and 35 (mN/m)&#x2264;E&#x2264;55 (mN/m), where D represents a dynamic surface tension at 15 ms of the processing liquid and E represents a dynamic surface tension at 1500 ms of the processing liquid.

Ink and processing liquid set, image forming method, and image forming device

A printing method includes applying a processing fluid to a recording medium and applying an ink to the recording medium, wherein the processing fluid contains a first nonionic resin including the following structure unit a-1, the first nonionic resin having a glass transition temperature of 15 degrees C. or lower, wherein the ink contains a second nonionic resin including the following structure unit a-1 and a coloring material 

Printing method and set of processing fluid and ink

Provided is an image forming apparatus, including: a pretreatment unit configured to bring a surface of a recording medium into contact with plasma; and an image forming unit configured to eject an ink onto the recording medium to thereby form an image; wherein the ink contains a pigment, water, a water-soluble organic solvent, and resin particles, wherein the water-soluble organic solvent is an amide compound having an inorganic/organic value (I/O value) of 1.1 to 2.0, and wherein the resin particles are ether-based polyurethane resin particles and have an acid group amount of 2.0 meq/g or more.

Image forming apparatus and image forming method

The present invention provides an inkjet ink which is excellent in image quality and high-speed printing on plain paper, in storage stability and in ejection stability and gives less load on a maintenance device for an inkjet recording apparatus; and an ink cartridge, an inkjet recording apparatus, and an inkjet recording method, using the inkjet ink. An inkjet ink containing a water dispersion of pigment-containing water-insoluble vinyl polymer particles; a water-soluble organic solvent; and water, wherein an ink residue from the inkjet ink has a viscosity of 3,000 mPa&#xb7;s or less, the ink residue is obtained by leaving the inkjet ink to stand at a temperature of 25&#xb0; C. and a humidity of 15% until substantially no mass change occurs, and wherein the inkjet ink, pH of which is adjusted to 7 with an acid, has a viscosity of 500 mPa&#xb7;s or more.

Inkjet ink, ink cartridge, inkjet recording apparatus, inkjet recording method and image forming apparatus

An ink-jet O/W emulsion ink of the present invention includes an aqueous continuous phase (a), and a nonaqueous discontinuous phase (b), wherein the aqueous continuous phase (a) includes water, at least one pigment and at least one ionic or nonionic surfactant, and the nonaqueous discontinuous phase (b) includes at least one water-insoluble organic material having a hydroxyl group.

Ink-jet O/W emulsion ink and ink-jet recording method using the same

An image-forming apparatus includes a head unit configured to include line-type recording heads for ejecting ink droplets, a transport mechanism disposed facing the recording head and configured to transport a sheet, a maintain-recovery mechanism disposed downstream from the transport mechanism in a direction in which the sheet is transported and configured to maintain and recover the line type recording heads, and a head drive mechanism configured to move the head unit between a position facing the transport mechanism and a position facing the maintain-recovery mechanism in the direction in which the sheet is transported.

Image forming apparatus

An ink cartridge for use with, for example, a stencil printer and storing viscous ink therein is disclosed. The cartridge is free from damage and deformation during storage or transport in various kinds of atmospheres. Particularly, an ink outlet included in the cartridge is prevented from tilting. The cartridge can, therefore, be surely and accurately mounted to an apparatus. The ink outlet is protected from damage even when the cartridge is let fall by accident.

Cartridge for storing a viscous substance

Growing community of inventors

Miyagi, Japan

Yukitaka Watarai