CURTAIN COATING AND CURTAIN COATER

摘要

PROBLEM TO BE SOLVED: To stably conduct curtain coating at all times at a high speed even if conductivity is varied on the rear of a support by increasing the surface potential of a back roller in contact with the rear of the support to be coated with a coating soln. of curtain filmy shape. SOLUTION: In the curtain coater 1 appropriately used when the emulsion or a photographic sensitive material is applied on the support B of a photographic paper to produce the photographic paper, a coating soln. is uniformly supplied from a coating soln. feed slit 3 in the width direction and let flow down on a slide face 2 to form the thin film of the coating soln. This thin film is allowed to flow down between a couple of edge guides 4 provided on both sides of the lower end of the slide face 2 in the shape of curtain film and collided with the surface of the support B when the transporting direction is reversed by a back roller R to form a coating layer. In this case, a DC voltage from a DC power source 12 is impressed on the periphery of the back roller R to stably coat the thin film at a high speed with high viscosity.