Printing device and printing method
AssigneeRicoh Company, Ltd.
InventorHiroshi Gotou
Life of this patent
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Abstract
A printing device including an inkjet head including a nozzle plate, where the printing device is configured to eject an ink from the inkjet head and the ink includes a colorant, at least one organic solvent, and water, wherein a dynamic surface tension A of the ink at 25° C. with a surface lifetime of 15 msec as measured by a maximum bubble pressure method is 34.0 mN/m or less, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy a formula below, 10.0%≦[(A−B)/(A+B)]×100≦19.0%, and wherein a receding contact angle of the ink relative to the nozzle plate is 35° or greater.
Claims11
A printing device comprising
- an inkjet head including a nozzle plate, where the printing device is configured to eject an ink from the inkjet head and the ink includes a colorant, at least one organic solvent, and water,
- wherein a dynamic surface tension A of the ink at 25° C. with a surface lifetime of 15 msec as measured by a maximum bubble pressure method is 34.0 mN/m or less, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy a formula below,
- 10.0%≦[(A−B)/(A+B)]×100≦19.0%, and
- wherein a receding contact angle of the ink relative to the nozzle plate is 35° or greater.
A printing method comprising
- ejecting an ink from an inkjet head including a nozzle plate, where the ink includes a colorant, at least one organic solvent, and water,
- wherein a dynamic surface tension A of the ink at 25° C. with a surface lifetime of 15 msec as measured by a maximum bubble pressure method is 34.0 mN/m or less, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy a formula below,
- 10.0%≦[(A−B)/(A+B)]×100≦19.0%, and
- wherein a receding contact angle of the ink relative to the nozzle plate is 35° or greater.
Dependencies are inferred from the claim text.