| 摘要 |
PURPOSE:To obtain a clear and endurable printing image with little differences in density of the initial and final stages of printing by printing with the use of an ink which has a specifically adjusted viscosity and through a medium of a porous layer of heat-resistant resin. CONSTITUTION:Pertaining to a recording medium which contains a heat fusion type ink in its porous structure and which is good for repeated use, during the forming process of porous layer, the medium is dissolved in two or more solvent groups like water or volatile organic solvents has (have) volatility lower than that of a solvent which easily dissolves the resin of the layer but is almost insoluble in the latter and yet may be used as a solvent for dilution; and evaporated, dried and hardened. Due to the above properties a skin forming on the porous resin layer surface is prevented and a decreased in printing density in the initial stage of printing is prevented. In addition, by controlling a melting velocity of heat fusion ink under 40 cps at 100 deg.C oozing of ink out to the porous layer surface by capillary action is facilitated. By the above regulation of the viscosity of the ink, regardless of repeated printing, printing image of little difference in density becomes obtainable, and an excellent printing durability is brought about. |
