PURPOSE: To provide a titled bath cell which prevents sticking of foreign matter on the surface of a strip and improves the quality and productivity of a product by providing slit pipes provided with slit nozzles for injecting a molten plating metal near the place of the bath surface in the plating bath cell where the strips enters or/and the part where the strip is pulled from the bath surface.
CONSTITUTION: A molten plating metal which exists in the position of about 200mm below a bath surface 17 and contains extremely less foreign matter is sucked by the operation of a pump 31 in a bath cell 15 mounted with the above- described slip pipes 25. The sucked plating metal is pressurized by the pump 31 through a pipe 33 and is fed through a pipe 29 to the pipes 25 so that said metal is injected from slip nozzles 27 toward a steel strip 1 near the part where the strip 1 and the bath surface 17 contact with each other. The injected flow is thereby passed toward the strip 1 from diagonally below to clean away the foreign matter floating on the surface 17 near the strip apart from the strip 1. The formation and flocculation of the oxide metal on the surface of the plated steel strip to be pulled up are prohibited by the oscillation generated from the collision against the jet flow, by which the generation of the defective product is eliminated and the yield is improved.
AKIYOSHI KATSUNORI
YAMANE YOSHIMICHI
