Ricoh Company, Ltd.

Kenta Kenjoh

Satoshi Takahashi

Minoru Masuda

Yoshihiro Norikane

Yasutada Shitara

Tetsuya Tanaka

Kiyotada Katoh

Satoshi Izumi

Masahiro Kawamoto

Ippei Muneoka

The particulate material production method includes vibrating a particulate material composition liquid in a liquid column resonance chamber having at least one nozzle to form a standing wave in the particulate material composition liquid caused by liquid column resonance, so that droplets of the particulate material composition liquid are ejected in a droplet ejection direction from the nozzle so as to fly in a space in a flight direction; feeding a gas in a direction substantially perpendicular to the droplet ejection direction to change the flight direction of the ejected droplets; and solidifying the droplets in the space to produce a particulate material. The particulate material composition liquid includes at least a solvent and a component of the particulate material dissolved or dispersed in the solvent, and the nozzle is located at a location corresponding to an anitnode of the standing wave.

Particulate material production method and apparatus, toner production method and apparatus, and toner

To provide an apparatus for producing a toner, including: a droplet forming unit configured to periodically discharge a toner composition liquid, which includes at least a resin and a colorant, from a plurality of nozzles so as to form droplets; a gas flow forming unit configured to form a gas flow which passes through a narrowed portion that corresponds to a nozzle formation area and that is placed on a downstream side of the nozzles with respect to a droplet discharge direction, and which advances in the droplet discharge direction; and a particle forming unit configured to form toner particles by solidifying the droplets of the toner composition liquid passed through the narrowed portion and then discharged, wherein the opening area of an opening which forms the narrowed portion decreases from an inlet side of the narrowed portion toward an outlet side of the narrowed portion.

Apparatus for producing toner, method for producing toner, and toner

A continuous kneading apparatus including: a stationary portion having an internal space where matter is conveyed; a rotary disc member and a screw member which are configured to convey the matter in the internal space; a drive shaft member to which the rotary disc member and the screw member are fixed; and a cooling medium passage through which a cooling medium passes, wherein the cooling medium passage is provided for the screw member which is placed upstream of the rotary disc member with respect to the conveyance direction of the matter, wherein the cooling medium passing in the cooling medium passage is lower in temperature than the matter passing in the internal space, and wherein the matter passes in the internal space while provided with shear force by rotation of the drive shaft member and thus continuously kneaded, and while cooled by the cooling medium.

Kneading apparatus and method for producing toner

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Shizuoka, Japan

Kenta Kenjoh