RISO Screen Master has a unique structure. A heat-sensitive mesh is laminted with film. Mesh count is a measure of how many threads of polyester cross each other per square inch of screen. Lower mesh count screens have larger openings that allow more ink to flow through, while higher mesh count screens allow for finer details in your printing. The basic and commonly used sizes are from 70 to 200 mesh counts.
Therefore screen master with large openings such as 70 mesh count is suitable for designs with solid area and gold and silver inks which have large particles. On the otherhand, pigment inks which contain large particles cannot pass through finer mesh count screen such as 200 mesh count. It might cause clogging.
Higher mesh counts are suitable for small numbers and letters for business cards or expressing detailed hairline designs. In other words, mesh counts are chosen by applications rather than types of printed materials.