| 摘要 |
PURPOSE:To manufacture perfectly one-side plated metal sheets at a high plating speed in a simple and cheap manner by dipping two longsized metal sheets, in a hot dipping bath, both of the edge portions of which are continuously joined in the longitudinal direction, after which the resulting plated layers are solidified and the joined portion is continuously cut. CONSTITUTION:Flattened steel strips S1, S2 uncoiled by uncoilers C1, C2 are passed through surface purification tank 7 and correctly superposed. Both of the edge portions of the strips are then continuously welded using continuous welding machine 10 such as a high frequency resistance welding machine. Next the welded strip is fed to annealing furnace 15, annealed at 700-800 deg.C in a reducing atmosphere, cooled to around a temp. suitable for hot dipping, passed through hot dipping bath 18, sprayed with a gas from gas wiping nozzles 20 to regulate the thickness of the plated layers, and cooled in cooling duct 21. The both-side plated strip is continuously cut by side trimmer 25 along a line just inside the weld line to be separated into two strips, where are coiled by coilers 28, 28'. |
