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US 7,922,316 B2Granted
Inkjet recording apparatus and inkjet recording method
AssigneeRicoh Company, Ltd.
InventorsAkiko Bannai, Eisuke Hori, Akihiko Gotoh, Kiyofumi Nagai
Life of this patent
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Abstract
An inkjet recording apparatus is provided, wherein the inkjet recording apparatus contains a recording head with a filter, an ink that comprises a colorant, a humectant, a surfactant, and a wetting agent is discharged from the recording head, the viscosity of the ink at 25° C. is 6 mPas to 13 mPas, and the fluid resistance of the filter against the ink is 4.4×109 Pas/m3 and 2.2×1010 Pas/m3.
Claims15
An inkjet recording apparatus comprising:
- an ink, and
- a recording head with a filter,
- wherein the ink that comprises a colorant, a humectant, a surfactant, and a wetting agent is discharged from the recording head, and
- the viscosity of the ink at 25° C. is 6 mPa·s to 13 mPa·s, the volume-average particle diameter of the colorant is 5 nm to 200 nm, and the fluid resistance of the filter against the ink is 4.4×109 Pa·s/m3 to 2.2×1010 Pa·s/m3 wherein the fluid resistance (R) of a filter under a pressure (P) is obtained by R=PT/V where (V) is the volume of ink flowed for a time period (T),
- wherein the recording head comprises a nozzle and an ink-containing positively pressurized liquid chamber, and
- wherein the nozzle and the ink-containing positively pressurized liquid chamber are in direct fluid communication.
3 more elements
An inkjet recording method that employs an inkjet recording apparatus which comprises an ink, and a recording head with a filter,
- wherein the ink that comprises a colorant, a humectant, a surfactant, and a wetting agent is discharged from the recording head, and the viscosity of the ink at 25° C. is 6 mPa·s to 13 mPa·s, the volume-average particle diameter of the colorant is 5 nm to 200 nm, and the fluid resistance of the filter against the ink is 4.4×109 Pa·s/m3 to 2.2×1010 Pa·s/m3 wherein the fluid resistance (R) of a filter under a pressure (P) is obtained by R═PT/V where (V) is the volume of ink flowed for a time period (T),
- wherein the size of drops discharged from the nozzles is 3 pL to 40 pL, the velocity of the ejected drops is 6 m/sec to 20 m/sec, the driving frequency is 1 kHz or greater, and the resolution is 300 dpi or greater,
- wherein the recording head comprises a nozzle and an ink-containing positively pressurized liquid chamber containing the ink, and
- wherein the nozzle and the ink-containing positively pressurized liquid chamber are in direct fluid communication.
1 more element
Dependencies are inferred from the claim text.