| 摘要 |
PURPOSE:To avoid instability in operation due to clogging and enable favorable white color printing, by mixing a foaming agent into an ink for use in an ink jet printer. CONSTITUTION:A high molecular weight material used as a binder in an ink is dissolved by a solvent to prepare a transparent ink, and a liquid foaming agent conforming to the solvent is added to and mixed into the transparent ink. The foaming agent is of such a type that it foams on a post-treatment with heat, UV rays or the like after printing. The post-treatment after printing is conducted by applying UV rays, heat or the like corresponding to the foaming agent being used, whereby the ink is foamed, followed by drying. The foams 4 thus formed expand the binder in the transparent ink 2b, and the ink is changed from the transparent state into a white colored state owing to the irregular reflection by the foams 4, resulting in a white print. |
