| 摘要 |
PURPOSE:To allow high-quality variable density pictures by drying forcibly ink drops printed on recording paper and then printing an ink drop at the same point. CONSTITUTION:Ink drops printed on a recording paper 7 are forcibly dried by an ink drying means. After completion of the drying, the following ink drop 6 is printed at the same point. With this forcible drying, an ink solvent on the recording paper disapperars, only a dyestuff or a pigment and trace quantity of a high-boiling point solvent remain, and there is no problem for double printing. Density is controlled by the number of printed ink drops. The maximum number of double printing is decided by that of gradation required by a variable density picture. Thus high-quality various density pictures can be obtained. |
