Ink circulation apparatus, ink circulation method and inkjet recording apparatus

摘要

An object of the invention is to prevent, both bubbles and particles from being generated, when circulating ink in an inkjet head. The object can be achieved by an ink circulation apparatus, including: an ink tank that accumulates radical polymerization-type UV-curing ink so as to be in contact with gas including at least oxygen; an inkjet head; oxygen removing means that removes oxygen from the radical polymerization-type UV-curing ink; and control means that changes a mode between a first mode of removing oxygen from the radical polymerization-type UV-curing ink by the oxygen removing means and a second mode of not removing oxygen from the radical polymerization-type UV-curing ink and changes a mode from the first mode to the second mode before electric power of the apparatus is cut off.

主权项

1. An ink circulation apparatus, comprising:
an ink tank that accumulates radical polymerization-type UV-curing ink so as to be in contact with gas including at least oxygen; a supplying flow path that communicates with the ink tank and a supply port of an inkjet head including the supply port to which the radical polymerization-type UV-curing ink is supplied, a nozzle that ejects the radical polymerization-type UV-curing ink, and a discharge port from which the radical polymerization-type UV-curing ink that is not ejected from the nozzle is discharged; a supply pump that is provided in the supplying flow path, and supplies the radical polymerization-type UV-curing ink accumulated in the ink tank to the inkjet head; an oxygen removing unit that is provided in the supplying flow path, and removes oxygen from the radical polymerization-type UV-curing ink; a discharging flow path that communicates with the discharge port of the inkjet head and the ink tank; a collecting pump that is provided in the discharging flow path, and collects the radical polymerization-type UV-curing ink discharged from the discharge port to the ink tank; and a control unit that changes a mode between a first mode of removing oxygen from the radical polymerization-type UV-curing ink by the oxygen removing unit and a second mode of not removing oxygen from the radical polymerization-type UV-curing ink, and changes a mode from the first mode to the second mode before electric power of the apparatus is cut off.