On the rate of “press-in” and the rate of ink transfer The rate (%) of ink transfer goes up with the amount of ink, filled in the lines of a plate, at the constant in the rate of “press-in” and reaches to a maximum value 45% as the ideal 100% is adaptedd to the amount of ink.ģ. In the intaglio printing it is necessary for a better printing to increase the rate of ink transfer, especially important on the ink of fine lines. The rate (%) of “press-in” increases in the printing conditions, thiner or softer paper and a stronger pressure are applied, in these effects the thickness of paper is more influential.
One of the most important factors for a better intaglio printing is “press-in”, this means to be pressed the paper in a line of a plate. Printing ink: a black ink for intaglio printing with 1, 300 poises in viscosity. Printing paper: India paper and Mitsumata paper. Printing plate: engraved crossed lines, a sectional shape of a line is a triangle with 120 degree at the bottom and the width of lines is 150-454μ. The used materials for this experiment are as follows. In the experiment, at first, we tried to clarify the pressure and shape, using a strain gauge for the printing pressure and a light intersection microscope for the shape of lines or inked lines of a plate, and in the data investigated relations between the printing pressure or hardness of printing paper and the amount of transfered printing ink. We know the intaglio printing has been possessed its long history in the making bank-notes and negotiable securities but kow nothing about its printing mechanism in scientifical meanings, owing to the difficulty of measuring a powerful printing pressure or a shape of lines of a plate and no instrument to satisfy the measuring.