Abstract
The frequency of picking occurrence in off-set printing depends on surface strength, namely, resistance of coated paper to ink tack. In this study, the surface strength was assumed to be determined by the adhesive area of pigment/binder interface. Thus, a new method of the adhesive area measurement was proposed. The method follows the steps : SB -latex of a dry coating is hardened with osmium oxide, a network structure of only the latex film is preserved by dissolving the pigment, and the adhesive area is calculated from the specific surface areas of the residual latex film and of the pure pigment powder.It was found that no picking occurred on a RI printability tester above an adhesive area of 3. 5 g/m2 both for coated papers with different SB-latex contents and for those dried at different temperatures. On the other hand, there was no threshold regarding the pore volume of the dry coatings. This concluded that the adhesive area between pigment and binder better explained the surface strength than the pore volume of a dry coating.
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