Abstract: A UV-curable aqueous inkjet printing ink composition contains: water-soluble acrylamide-based monomers by 20.0 to 70.0% by mass, water-soluble hydroxyl group-containing monofunctional monomers by 5.0 to 60.0% by mass, and water-insoluble polymerizable compounds by 8.0 to 35.0% by mass, relative to the total mass of all polymerizable components; a photopolymerizable initiator and/or sensitizer by 3.0 to 10.0 parts by mass relative to 100 parts by mass representing the total mass of all polymerizable components; a pigment; and water; wherein the ratio of the water-soluble acrylamide-based monomers and water-soluble hydroxyl group-containing monofunctional monomers, (water-soluble acrylamide-based monomers/water-soluble hydroxyl group-containing monofunctional monomers), is 0.3 to 10.0; and the ink composition has ability to be partially cured by being irradiated with a UV-LED light having a peak wavelength between 365 and 405 nm, to a cumulative light quantity of 100 mJ/cm2 or less.

Abstract: An inkjet printing device for multi-color printing includes: multi-color inkjet nozzles that move in the direction perpendicular to the moving direction of the target base printing material and also in the direction parallel to the surface of the target base printing material; plasma ejection ports provided downstream of the multi-color inkjet nozzles in a manner oriented facing the surface of the multiple colored inks printed on the target base printing material; and an electron beam irradiation part located on the downstream side of the inkjet nozzles and plasma ejection ports, in a manner oriented facing the printed surface of the target base printing material.

Abstract: An object of the present invention is to provide a photocurable aqueous ink composition for inkjet printing that is excellent in all aspects including miscibility when components excluding pigments and pigment dispersants are mixed, curability during printing, adhesion property and water resistance of a printed coating film. As a solution, provided is a photocurable aqueous ink composition for inkjet printing including: water by 10.0 to 45.0% by mass in the photocurable aqueous ink composition for inkjet printing; a colorant; a water-soluble polymerizable compound containing N-monosubstituted acrylamide; and a photoinitiator.

Abstract: An object is to provide a continuous inkjet ink composition that has excellent storage stability and anticorrosion effect on a metal member, and that allows printing with good image quality. As a solution, a continuous inkjet ink composition is provided that includes a pigment, a resin, a metal salt of thiocyanic acid at 0.05 to 1.7% by mass in the composition, and tetraalkylammonium hexafluorophosphate at 0.05 to 2.7% by mass in the composition.

Abstract: An aqueous inkjet printing ink composition that is cured by the following radiation rays (1) includes: an acylphosphine oxide-based compound as a photopolymerization initiator of 3 to 10% by mass; a monofunctional water-soluble monomer of 30 to 50% by mass; a multifunctional water-soluble monomer of 10 to 30% by mass; and a pigment based on the whole ink composition, wherein the radiation rays (1) are radiation rays that contain a wavelength of 800 nm and a wavelength of 385 nm and have an irradiation intensity of 100 mW/cm2 or less at a wavelength of 385 nm. The aqueous inkjet printing ink composition can be cured by specific radiation rays and does not change color of the ink composition in an exemplary embodiment.

Abstract: Disclosed is an electron beam curable water-based ink-jet ink composition comprising a colorant, a resin emulsion, a water-soluble photopolymerizable monomer, and water, wherein the water-soluble photopolymerizable monomer comprises an acrylamide derivative, wherein a content of the acrylamide derivative is 20 to 55% by mass in the electron beam curable water-based ink-jet ink composition, and wherein a content of the resin emulsion is 1 to 11% by mass in terms of a solid content in the electron beam curable water-based ink-jet ink composition.

Abstract: An inkjet printing device for multi-color printing includes: multi-color inkjet nozzles that move in the direction perpendicular to the moving direction of the target base printing material and also in the direction parallel to the surface of the target base printing material; plasma ejection ports provided downstream of the multi-color inkjet nozzles in a manner oriented facing the surface of the multiple colored inks printed on the target base printing material; and an electron beam irradiation part located on the downstream side of the inkjet nozzles and plasma ejection ports, in a manner oriented facing the printed surface of the target base printing material.

Abstract: An inkjet printing device includes: an inkjet nozzle that moves on a printing surface of a target base printing material in a direction perpendicular to a moving direction of the target base printing material and parallel with the printing surface of the target base printing material; a plasma ejection port disposed downstream of the inkjet nozzle in the moving direction of the target base printing material, for treating the printing surface of the target base printing material with a plasma; and an electron beam irradiation part disposed downstream of the plasma ejection port in the moving direction of the target base printing material, for treating the printing surface of the target base printing material with an electron beam. The device allows inks used in printing to be cured without fail even when they contain no photopolymerization initiator.

Abstract: A continuous-type inkjet ink composition includes a polyvinyl butyral resin (Resin 1) and a rosin ester resin (Resin 2), and organic solvents, wherein the content of Resin 1 in the inkjet ink composition is 1.0 to 8.0 percent by mass, and the content ratio of Resin 1 and Resin 2 satisfies “Resin 1:Resin 2=20:1 to 10:8” based on ratio by mass, and the total quantity of organic solvents regulated by industrial health and safety regulation is 5 percent by mass or less in the inkjet ink composition. The composition demonstrates excellent discharge stability and jetting property as well as excellent adhesion to various types of base printing materials including polyolefin films with no surface treatment.

Abstract: A non-aqueous magenta ink composition for ink jet printing comprising a pigment, a pigment dispersant, a binder resin and an organic solvent, wherein the pigment comprises C.I. Pigment Red 254 and a red pigment having a quinacridone skeleton, and wherein a total amount of the C.I. Pigment Red 254 and the red pigment having a quinacridone skeleton is not less than 50% by mass in the pigment.

Abstract: A non-aqueous magenta ink composition for ink jet printing comprising a pigment, a pigment dispersant, a binder resin and an organic solvent, wherein the pigment comprises C.I. Pigment Red 254 and a red pigment having a quinacridone skeleton, and wherein a total amount of the C.I. Pigment Red 254 and the red pigment having a quinacridone skeleton is not less than 50% by mass in the pigment.