Recording apparatus and recording method
There is provided a recording apparatus equipped with an ejection head that ejects an ink to a surface of the undercoat layer of an impermeable recording medium that has, on at least one surface thereof, an undercoat layer containing a polymeric compound selected from the group consisting of polyurethane, polyester, polyvinyl chloride, and polyolefin, wherein the ink contains a coloring agent, a polymer particle, water, and a water-soluble organic solvent and has a static surface tension of less than 30 mN/m and, when examined for dynamic surface tension by a maximum bubble pressure method, has a width of variation in dynamic surface tension for the period from 1 msec after to 1 sec after of from 0.2 mN/m to 3.0 mN/m.
1. A recording apparatus equipped with an ejection head that ejects an ink to a surface of the undercoat layer of an impermeable recording medium that has, on at least one surface thereof, an undercoat layer comprising a polymeric compound selected from the group consisting of polyurethane, polyester, polyvinyl chloride, and polyolefin,
wherein the ink comprises a coloring agent, a polymer particle, water, and a water-soluble organic solvent and has a static surface tension of less than 30 mN/m and, when examined for dynamic surface tension by a maximum bubble pressure method, has a width of variation in dynamic surface tension of from 0.2 to 3.0 mN/m, the width of variation in dynamic surface tension being a difference between the dynamic surface tension measured at 1 msec after and the dynamic surface tension measured at 1 sec after a new interface was formed at the end of a capillary and when a maximum bubble pressure is reached.
2. The recording apparatus according to claim 1 ,
wherein the undercoat layer in the impermeable recording medium further contains a surfactant selected from the group consisting of a silicone surfactant and a fluorochemical surfactant.
3. The recording apparatus according to claim 1 ,
wherein the undercoat layer in the impermeable recording medium further contains a cationic compound or contains a cationic polymeric compound as the polymeric compound.
4. The recording apparatus according to claim 1 , which is further equipped with a drying device that dries the ink ejected to the surface of the undercoat layer of the impermeable recording medium.
5. A recording method including an ejection step in which an ink that comprises a coloring agent, a polymer particle, water, and a water-soluble organic solvent and that has a static surface tension of less than 30 mN/m and, when examined for dynamic surface tension by a maximum bubble pressure method, has a width of variation in dynamic surface tension of from 0.2 to 3.0 mN/m, the width of variation in dynamic surface tension being a difference between the dynamic surface tension measured at 1 msec after and the dynamic surface tension measured at 1 sec after a new interface was formed at the end of a capillary and when a maximum bubble pressure is reached, is ejected to a surface of the undercoat layer of an impermeable recording medium that has, on at least one surface thereof, an undercoat layer comprising a polymeric compound selected from the group consisting of polyurethane, polyester, polyvinyl chloride, and polyolefin.
6. The recording method according to claim 5 ,
wherein the undercoat layer in the impermeable recording medium further contains a surfactant selected from the group consisting of a silicone surfactant and a fluorochemical surfactant.
7. The recording method according to claim 5 ,
wherein the undercoat layer in the impermeable recording medium further contains a cationic compound or contains a cationic polymeric compound as the polymeric compound.
8. The recording method according to claim 5 , which further includes a drying step that dries the ink ejected to the surface of the undercoat layer of the impermeable recording medium.