Abstract
In determining design conditions for an impact printer, it is necessary to study the ink transfer mechanism in impact printing and to clarify the relationship of print quality parameters, such as printed character stroke width and print density, to design conditions for printing mechanisms. This paper describes an analytical and experimental study of the liquid ink transfer mechanism using an inked ribbon in impact printing. The results obtained are as follows: (I) The liquid ink transfer mechanism can be well explained by the viscous flow model which assumes the structure of paper to be an arrangement of cylindrical capillaries and the ink to be a Newtonian fluid. (2) The quantity of ink transferred is proportional to the square root of the peak printing pressure and contact time, proportional to the mean capillary radius of paper, and inversely proportional to the square root of ink viscosity.
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