Ricoh Company, Ltd.

Shizuoka University

Satoyuki Sekiguchi

Hiroshi Yamashita

Daisuke Asahina

Tsuyoshi Sugimoto

Toshiyuki Kobashi

Rintaro Takahashi

Susumu Chiba

Masaki Watanabe

Tomohiro Nakagawa

Shinya Nakayama

Yukari Fukuda

Atsushi Yamamoto

Takashi Watanabe

Taku Hatakeyama

Toyoshi Sawada

Taichi Nemoto

Ryo Miyakoshi

Chiaki Tanaka

Juichi Furukawa

Yoshitaka Yamauchi

Azumi Miyaake

Takeshi Sako

Minoru Masuda

Masana Shiba

Keiji Makabe

Yukihiro Imanaga

Ayaka Tanaka

Idzumi Okajima

Ryota Inoue

Masahide Yamada

Shingo Sakashita

Yoshihiro Moriya

Suzuka Amemori

Tatsuya Morita

Kohsuke Nagata

Shogo Suzuki

Atsufumi Hanazawa

Yuya Hirokawa

Noriaki Okada

Akinori Saito

Takuya Saiga

Yuusuke Fujita

Saki Konno

Nobuyuki Mase

Shunsuke Mori

Keishi Mizuno

Jyun Ishiduka

Takahiro Yamashita

A processing fluid contains a metal ion and an organopolysiloxane, wherein the content of the metal ion in the processing fluid is from 0.5 to 50 g/L and the organopolysiloxane has a weight average molecular of from 5,000 to 500,000.

Processing fluid, ink set, inkjet printing device, and inkjet printing method

Provided is an ink including water, and an organic solvent, wherein a dried product of the ink has an endothermic peak temperature Tm of 22&#xb0; C. or higher but 74&#xb0; C. or lower as measured by differential scanning calorimetry, the differential scanning calorimetry includes first heating, cooling, and second heating, where the first heating is heating the dried product of the ink from &#x2212;60&#xb0; C. to 140&#xb0; C. at a heating rate of 10&#xb0; C./min, the cooling, which is performed after the first heating, is cooling a heated product obtained in the first heating from 140&#xb0; C. to &#x2212;60&#xb0; C. at a cooling rate of &#x2212;10&#xb0; C./min, and the second heating, which is performed after the cooling, is heating a cooled product obtained in the cooling from &#x2212;60&#xb0; C. to 140&#xb0; C. at a heating rate of 10&#xb0; C./min, and the endothermic peak temperature Tm is an endothermic peak temperature in the second heating.

Ink, pre-processing fluid-ink set, inkjet printing device, and inkjet printing method

An image forming apparatus contains an ink having a dynamic surface tension of from 30 to 50 mN/m at a life time of 15 msec at 25 degrees C., a container containing the ink and a head configured to discharge the ink to a fabric including a first fabric containing synthetic fiber in an amount of more than 50 percent by mass and a second fabric containing natural fiber in an amount of 50 percent by mass or greater, the head including a nozzle surface, wherein a first distance between positions of two consecutive droplets of the ink discharged from the head on the first fabric is shorter than a second distance between positions of two consecutive droplets of the ink discharged from the head on the second fabric.

Image forming apparatus

A liquid discharging device is provided that includes: a first head () containing a pretreatment liquid, configured to discharge the pretreatment liquid onto a recording medium; a second head () disposed downstream of the first head () in a conveyance direction of the recording medium, configured to discharge an ink; an exhaust unit () disposed upstream of the first head () in the conveyance direction, configured to evacuate a gas present between the first head () and the recording medium from a downstream side to an upstream side in the conveyance direction; and a housing () internally containing the first head () and the second head (), internally or externally containing the exhaust unit (), and having an opening () downstream of the exhaust unit () in the conveyance direction.

Liquid discharging device

An image forming apparatus includes an ink having a dynamic surface tension of from 30 to 50 mN/m at a life time of 15 msec at 25 degrees C., a container containing the ink, and a head configured to discharge the ink to a fabric including a first fabric containing synthetic fiber in an amount of more than 50 percent by mass and a second fabric containing natural fiber in an amount of 50 percent by mass or greater, wherein the droplet of the ink discharged to the first fabric is larger than the droplet of the ink discharged to the second fabric.

An ink set contains a pre-processing fluid containing a multivalent metal ion, a first ink and a second ink, wherein the first ink has a surface tension of 35 mN/m or greater at 25 degrees C. and a life time of 150 ms, wherein the second ink has a surface tension of 35 mN/m or greater at 25 degrees C. and a life time of 150 ms and the second ink is a white ink.

Ink set, inkjet printing device, and inkjet printing method

An inkjet ink comprising a resin and a polyvalent metal ion is provided. The resin contains a resin (1) having a structural unit represented by the following general formula (1):&#x2014;(CHCHO)&#x2014;&#x2003;&#x2003;general formula (1)where n represents an integer of 5 to 100. A dried film obtained by drying the resin having the structural unit represented by the general formula (1) has a storage modulus of 1.0&#xd7;10Pa or lower in a dynamic viscoelasticity measurement at 25 degrees C.

Inkjet ink, inkjet ink set, ink stored container, and inkjet recording method

An image forming method for forming an image on a non-absorbable substrate includes (a) applying a surface processing composition including water, a first organic solvent, and a urethane resin particle to the non-absorbable substrate, (b) applying a non-white ink including water, a second organic solvent, and a second acrylic resin particle and (c) applying a white ink including water, a third organic solvent, a third acrylic resin particle, and a white colorant.

Image forming method, image forming apparatus, and method for manufacturing printed matter

A liquid discharge apparatus includes a head configured to discharge a pretreatment liquid from nozzles formed on a nozzle surface of the head onto a medium, a holder configured to hold the medium with a gap between the nozzle surface of the head and the holder, and a heater configured to heat the medium held by the holder. The head discharges the pretreatment liquid onto the medium held by the holder with the gap of 4.0 mm or more.

Liquid discharge apparatus

A liquid discharging device includes a first head including a first nozzle formed on a first surface of the first head, the first head being configured to discharge a first ink containing a metal oxide from the first nozzle, a second head including a second nozzle formed on a second surface of the second head, the second head being configured to discharge a second ink containing a coloring material from the second nozzle, a recording medium holding unit configured to hold a recording medium, and a heating device configured to heat the recording medium, wherein the first head discharges the first ink in a state where a first distance between the first surface and the recording medium holding unit is 4.0 mm or more.

An ink set is provided including a first ink containing a polyvalent metal ion and a second ink containing a copolymer having a structural unit represented by the following general formula (1): 

Ink set and inkjet recording method

A surface treatment liquid composition for a substrate is provided. The surface treatment liquid composition includes a water-soluble salt, water, and a resin particle including a resin having a structural unit represented by the following formula (1): where Rrepresents &#x2014;COO&#x2014;; each of Rand Rindependently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and n represents an integer of from 5 to 100.

Surface treatment liquid composition for substrate, ink set, recording method, recording device, storage container, and printed matter

An ink includes a solvent and a resin, wherein the storage elastic modulus G1 of an ink film obtained by drying the ink is 2.0&#xd7;10-5.0&#xd7;10Pa at 20 degrees C. as measured by a dynamic viscoelasticity measuring method and the ratio (G2/G1) of the storage elastic modulus G1 to the storage elastic modulus G2 of the ink film measured at 80 degrees C. by the dynamic viscoelasticity measuring method is 0.30-0.85.

Ink, ink container, inkjet recording method, inkjet recording device, and recorded matter

A surface treatment liquid composition for a substrate includes a nonionic resin particle and a multivalent metal salt.

Surface treatment liquid compostion, ink set, recording method, and recording device

Provided is a resin for a toner, which is a copolymer including a crystalline segment, and having a maximum elastic stress value at 100&#xb0; C. (ES100) of 1,000 Pa or less, and a maximum elastic stress value at 70&#xb0; C. (ES70) of 1,000 Pa or greater when the temperature is lowered from 100&#xb0; C. to 70&#xb0; C., where the maximum elastic stress values are measured according to a large amplitude oscillatory shear procedure.

Resin for toner, toner, developer, image forming apparatus, and process cartridge

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Shizuoka, Japan

Satoyuki Sekiguchi