Patent ID: 9539823
Date: 2017-01-10
CPC Classifications: B41J,B41M,C09D

Claim:
1. An ink jet recording method using an ink jet recording apparatus including a plurality of heads including first and second heads that respectively eject droplets of first and second radiation-curable ink compositions that are different from each other onto a recording medium, a plurality of first light sources that respectively emit an active radiation to irradiate the droplets on the recording medium, the second head being located next to the first head in a first direction, and the first and second heads being located in a carriage, the method comprising: transporting the recording medium in a second direction perpendicular to the first direction; ejecting the droplets of the first and second radiation-curable ink compositions from the first and second heads onto the recording medium while the first and second heads are scanning in the first direction; performing an irradiation by irradiating the droplets of the first and second radiation-curable ink compositions with the active radiation from the plurality of first light sources at a first irradiation energy, one of the plurality of first light sources being located next to the first head in the first direction, another of the plurality of first light sources being located next to the second head in the first direction; and performing a further irradiation by irradiating the droplets of the first and second radiation-curable ink compositions irradiated by the plurality of first light sources, the further irradiation being conducted by a second light source at a second irradiation energy, the second light source being located further on a downstream side of the second direction than the plurality of heads and the plurality of first light sources, wherein each of the plurality of first light sources includes an LED, the each of the first and second radiation-curable ink compositions contains a photopolymerization initiator of 5% to 15% by mass, the photopolymerization initiator contains an acylphosphine oxide-based photopolymerization initiator, and a total irradiation energy of the droplets with the active radiation is more than or equal to an energy that is required for curing 90% of the first and second radiation-curable ink compositions.