Ink Receptivity of the Lithographic Plate (Part 1)

Effect of the Components of Surface Tension on Ink Receptivity

Abstract

From the viewpoint of fundamental study of ink receptivity of the lithographic plate, the relation between the components (dispersion part and polar part) of the surface tension of various solid surfaces and the ink receptivity in the presence of the dampening solution was examined.
The samples of solid surface used in this study were various plastic films and light sensitive coatings. The dampening solutions applied were distilled water and aqeous solution of isopropyl alcohol (0.25V/V).
From the experimental results, it was concluded that; (1) ink receptivity depends upon the value of the polar part of solid surface tension (γ_S^P) and decreases as the value of (γ_S^P) increases, (2) in the case of the dampening solution of isopropyl alcohol, the value of (γ_S^P) that decreases ink receptivity is smaller than that in the case of water.