Image forming method and ink jet recording device

An image forming method, comprising:

• a first process for ejecting liquid droplets of two or more kinds of radiation curable ink compositions onto a recording medium from an ejection head capable of ejecting the radiation curable ink compositions using an ink jet recording device;
• and
• a second process for irradiating the liquid droplets with active radiation by an irradiation measure capable of emitting the active radiation,
• wherein in the two or more kinds of radiation curable ink compositions, the second process satisfies the equation 0.3≦(Ei-Ef)/E90≦0.5 for each of the two or more kinds of radiation curable ink, where Ei is the amount of energy of a liquid droplet having the highest total irradiation engery, Ef is the amount of energy of a liquid droplet having the lowest total irradiation energy, and E90 is the amount of energy required for curing 90% of the radiation curable ink composition.

An ink jet recording device, comprising:

• an ejection head that ejects liquid droplets of a radiation curable ink composition onto a recording medium;
• and
• an active radiation irradiation device that irradiates the liquid droplets with active radiation,
• the ink jet recording device having:
• a control measure for controlling the active irradiation radiation device to satisfy the equation:
• 0.3≦(Ei-Ef)/E90≦0.5
• wherein Ei the amount of energy of a liquid droplet having the highest total irradiation energy, Ef is the amount of energy of a liquid droplet having the lowest total irradiation energy, and E90 is the amount of energy required for curing 90% of the radiation curable ink composition.