Riso Kagaku Corporation

Masakatsu Arai

Hiroshi Hayashi

Kenji Yamada

Kaoru Kimura

Kenji Oshima

Hirohide Hashimoto

Toshihiro Endo

Takahiro Wakayama

Kenji Shimomura

Manabu Iwamoto

Teruaki Okawa

Atsushi Tanaka

Syotaro Kon

Shin-Ichirou Shimura

Kenichi Oshio

Katsumi Kuriyama

Yoshiaki Matsuzawa

Kazuya Kawakami

Shotaro Kon

Ruri Watanabe

Shin-Ichiro Shimura

Kohji Nomura

An ink cartridge includes a socket portion provided at one end of an ink storage container and configured to be fitted to and detached from a joint portion of a printing machine, an ink supply port provided in the socket portion, and an inner plug configured to seal an ink passage to the ink supply port in response to biasing force applied from a side of the ink storage container. An insertion shaft, provided in the joint portion, pressing the inner plug against the biasing force upon a fitting of the socket portion to the joint portion enables the ink passage to communicate with the ink supply port. An ink holding portion of the inner plug with the insertion shaft pulled out from the ink holding portion after inserted holds the ink near the ink supply port.

Ink cartridge

A non-aqueous inkjet ink comprises silica and Brilliant Carmine 6B. A peak area obtained at the time of measurement of an organic acid quantity of a water extract of Brilliant Carmine 6B by use of a capillary electrophoresis apparatus is selected within the range of 50 to 300 mABU*sec.

Non-aqueous inkjet ink

A non-aqueous pigment ink which enables the ink repellency of the nozzle plate surface of the print head to be favorably maintained, while also enabling a superior image density to be obtained. The non-aqueous pigment ink includes a pigment, a pigment dispersant and a non-aqueous solvent, wherein the ink comprises a copolymer of vinylpyrrolidone and an alkene of 10 to 40 carbon atoms as the pigment dispersant, and also comprises a pigment derivative.

Non-aqueous pigment ink

An inkjet ink is provided, which produces a print that does not stick to a print printed by a plane paper copier or a laser printer even when these prints are laid on each other with the printed surfaces thereof facing each other. The inkjet ink comprises at least a pigment and a solvent, wherein 30 to 70% by weight of the solvent is constituted by a non-polar solvent, and 20% by weight or more of the solvent is constituted by an ester solvent having an &#x3b1; value of 6&#xb0; to 8&#xb0;, preferably 7&#xb0; to 8&#xb0;. Preferably, the ester solvent is at least one member selected from the group consisting of isooctyl palmitate, isooctyl isopalmitate and 2-octyldodecyl pivalate.

Inkjet ink

The Abstract as it appears in the enclosed English language translation is the more accurate and faithful translation of the original Abstract as it was filed in the PCT International application, and it is therefore requested that the Abstract be changed to this Abstract that more accurately identifies this invention, and as it has been faithfully re-translated by our Japanese associate and translator.

Method and system for calculating ink residue and ink container

An ink container includes an ink container body and a memory attached to the ink container body for storing predetermined information. The memory is bonded to a part of the surface of the ink container body at its surface opposed to the surface of the ink container body over an area not larger than 90% of its surface facing toward said part of the surface of the ink container body.

Ink container

A stencil printing ink container includes an ink container body. An ink charge port is provided in an end wall of the ink container body and an inner plug is mounted on the ink charge port. The inner plug is provided with an ink discharge port smaller in the outer diameter than the inner diameter of the ink charge port and gives an ink suction nozzle of an ink pump access to the ink discharge port.

Stencil printing ink container, stencil printing ink cartridge, method of manufacturing the ink cartridge, and inner plug for the ink container

A container is provided which comprises a cylindrical main body having an end wall at an end thereof; an outlet projecting from an outer surface of the end wall for allowing a content to be supplied; and a protecting member disposed on the outer surface of the end wall so that it surrounds the outlet and defines a groove portion between the outlet and the protecting member. The protecting member is preferably a continuous or discontinuous annular projection. A conduit of a pump can be coupled to the groove portion by engaging an inner circumferential surface of the protecting member with an outer circumferential surface of the conduit, or by engaging an outer circumferential surface of the outlet with an inner circumferential surface of the conduit.

Container

A piston-type ink container is inserted into an ink container holder of a stencil printer so that an ink suction nozzle of the stencil printer is fitted in a small diameter portion of the ink container to suck the ink in the ink container through an ink discharge port on the tip of the small diameter portion. A vacuum release mechanism at least partly releases vacuum in the space evacuated by the ink suction nozzle before the tip of the nozzle and the tip of the small diameter portion are aligned with each other when the ink container is drawn from the ink container holder.

Ink supply system and ink supply method for stencil printer and ink container

A stencil printing ink container comprises a cylinder, an area of one end of the cylinder, which area is other than an ink discharge opening section, being closed with an end wall, the other end of the cylinder being open, and a piston, which undergoes a sliding movement in an axial direction of the cylinder and along its inner circumferential surface. The ink container is filled with ink having a viscosity of at most 7.5 Pa&middot;s with respect to a shear rate of 100 sec and at 23&deg; C. and satisfies a specific relationship among an inside radius of the cylinder, an inside radius of the ink discharge opening section, a length of the ink discharge opening section, a weight of the ink filled in the ink container, a sliding movement starting load of the piston, and the viscosity of the ink.

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Ibaraki-ken, Japan

Masakatsu Arai