| 摘要 |
PURPOSE:To obtain a plating layer having excellent surface appearance and quality even if a line speed of a steel strip is increased by blowing a molten metal to a plated steel sheet emitted from a hot dip metal coating cell from slit-shaped nozzles having an outlet perpendicular to the transfer direction thereof or further subjecting the steel sheet to a gas wiping treatment. CONSTITUTION:The steel strip 3 which are emitted from an inline continuous annealing furnace 2 and have clean surfaces is introduced into the hot dip zinc coating cell 1 and is perpendicularly pulled up by a sink roll 4. Molten zinc is held stuck on the surfaces of the steel strip 3, but the molten zinc in the plating cell 1 is blown perpendicularly to both faces of the steel strip 3 by a force feed pump 6 and a header 7 from the slit-shaped nozzles 5, 5 in the position where the steel strip emerges from the hot dip zinc coating bath to prevent the sticking of the excess zinc and dross to the steel strip surfaces and the rise thereof together with the steel strip 3. Gaseous N2 or the like is further blown from wiping nozzles 9 in succession thereof to adjust the coating weight of the molten zinc. The deposition of the plating to obviate the generation of surface defects is easily executed even if the line speed of the steel strip 3 is high.
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