Inkjet printing method

摘要

An inkjet printing method comprises: an inkjet printing device having an inkjet print head with a built-in heater, an ink tank with a built-in heater the tank interior of which communicates with the atmosphere, and an ink supply path that connects the inkjet print head with the ink tank; a process of heating a radiation-curable inkjet ink in the ink tank with a viscosity at 25° C. of 1.0×103-1.0×106 mPa·s to A° C.; a process of supplying the inkjet ink to the inkjet print head; a process of making the inkjet ink in the inkjet print head to be a temperature B° C. in the range of 70° C. to 120° C. and ejecting to the printing medium; and a processing of irradiating radiation on the printing medium. A° C. is a temperature 5-30° C. higher than B° C.

主权项

1. An inkjet recording method comprising a step of ejecting an active ray-curable inkjet ink having an ink viscosity at 25° C. of 1.0×103 to 1.0×106 mPa·s, using an inkjet recording apparatus including:
an inkjet recording head having a built-in heater; an ink tank having a built-in heater and an air-communicating valve, wherein the air-communicating valve communicates air to the interior of the tank when the valve is opened; and an ink supply channel that communicates between the inkjet recording head and the ink tank, the method further comprising: heating the active ray-curable inkjet ink in the ink tank to A° C. for degassing the ink while the air-communicating valve is open, whereby a gas generated by the ink during the step of heating can be discharged through the air-communicating valve; supplying the active ray-curable inkjet ink that has been heated to A° C., to the inkjet recording head through the ink supply channel; adjusting the active ray-curable inkjet ink that has been supplied to the inkjet recording head, to temperature B° C. in the range of 70° C. or higher but lower than 120° C., and ejecting the ink to a recording medium; and irradiating the active ray-curable inkjet ink that is ejected to the recording medium, with active radiation, wherein A° C. is a temperature higher by 5° C. to 30° C. than B° C.