Comparison of dynamic print gloss measurement techniques

Well-defined optical properties are essential in determining the quality of printed papers. The measurement of optical properties, such as print gloss, as a function of time provides a means of studying ink-setting behavior and paper-ink interactions. This study compares three different methods for measuring dynamic print gloss: a dynamic gloss meter, a diffractive-optical-element-based gloss meter (DOG), and a polarized-light reflectometer. Four double-coated papers were printed at varying ink levels. This paper compares and discusses the technical details of the measurement techniques. Dynamic print gloss results are evaluated in the light of current ink-setting theories. Each of the methods is highly applicable to ink-setting studies. With low inking level, the paper properties, surface roughness, and absorption are important for gloss development. Printing conditions such as speed, nip geometry, and materials have significant influence. As the amount of ink used in printing is increased, the printing conditions start to influence the gloss dynamics considerably, especially on glossy papers.