| 摘要 |
PURPOSE:To increase an ink component to a resin and to carry out printing with good ink density by dissolving an ink material and a resin in a solvent and applying the obtained solution to a sheet like base material to form a thermal transfer layer and heating the thermal transfer layer at temp. sufficient to boil off the solvent and to soften the resin. CONSTITUTION:For example, a base material 10 is made of a polyethylene terephthalate sheet and an ink material 11 is supplied to one surface of the base material 10 from an ink supply tank 12 to be applied thereto in predetermined thickness by a wire bar 13 to form a thermal transfer layer 16. The ink material 11 is prepared by dissolving a KAYASET(R) black in a solvent and mixing a resin with the resulting solution. As the resin, a vinyl chloride/ vinyl acetate resin having an m.p. and a pour point higher than those of the solvent of the ink material is designated. When this thermal transfer layer 16 is heated from the rear of the base material 10 by a heating roller 14, the resin is softened and the solvent is foamed and evaporated and the ink component flows in the voids formed by foaming to reduce the occupying ratio of the resin and, therefore, heat conductivity is improved. |
