| 摘要 |
PURPOSE:To enable a simultaneous multilayer coating process using a slide hopper without trouble with good reproductivity by controlling the surface tension of the coating soln. for forming the uppermost layer of plural liquid layers to a value lower than those of the coating solns. for the other layers in the preparation of a photosensitive material. CONSTITUTION:In forming the multilayers of a photosensitive material by simultaneous coating, each of coating solns. of the four layers of the lowest layer emulsion S1, a middle layer emulsion S2, an upper layer emulsion S3, and the uppermost protective soln. S4 is fed into each of hollow spaces 2, 4, 6, 8 at each prescribed flow rate with each of pumps P1, P2, P3, P4. Further, each liquid is fed through each vertical slot 3, 5, 7, 9 and each of outlet slits N1, N2, N3, N4 along each of declined faces 12, 14, 16, 18, and successively laminated in one body on a base W supported from the rear side and moved forward with a roller 10 to form coating layers 20. At that time, the surface tension of the coating liquid S4 is controlled to a value lower than those of the other liquids S1, S2, S3. As a result, simultaneous multilayer coating layers can be formed without trouble, such as uneven coating or repellency in superior reproducibility. |
