What is the information on printing conditions that affect mirror effect?

Printing pressure and doctor pressure are important in printing conditions. Mirror ink provides mirror effect and opacity by orienting aluminum pigments. Therefore, in order to orient the aluminum pigments, the printing pressure and doctor pressure should be set higher than for general solid inks.

Thicker film thickness (3μ or more) may cause delamination in the aluminum layers. In addition, mirror surface will be reduced, causing unevenness. As for opacity, thicker film thickness improves opacity, but if the aluminum pigments are well oriented, opacity can be obtained even with a thin film thickness.

Stable quality (mirror effect and opacity) of printed materials can be obtained by printing recommended conditions described in 1-2 Screen stencil, 1-3 Squeege, 2-2 Drying conditions, and 2-3 Printing conditions.