Multi-layer coating method, and planographic printing plate and manufacturing method thereof

摘要

A sequential multi-layer coating method comprises: applying a photosensitive layer protection layer (A) L1 with a rod coating device (14) onto a continuously traveling web (12); and applying a photosensitive layer protection layer (B) L2 with an extrusion coating device (16), wherein W/[U(³1-³2)]‰¥0.018 ... (A1) is satisfied when W (cc/m 2 ) represents a wet coating amount of the photosensitive layer protection layer (B) L2; U (m/min.) represents a traveling speed of the web (12); ³1 (mN/m) represents a dynamic surface tension of the photosensitive layer protection layer (B) L2; and ³2 (mN/m) represents a static surface tension of the photosensitive layer protection layer (A) L1. This method provides stable coating without coating defects such as poor coating, liquid repellency and coating streak when a non-contact coater is used as a coating device for the upper layer to conduct sequential multi-layer coating.