| 摘要 |
PURPOSE:To make the responsiveness of the rate of evaporation fast and to prevent splashing by installing a heater which is a heating soruce in the upper part in a vacuum deposition furnace and floating a carbon block in the bath. CONSTITUTION:When a shutter 4 is opened in the stage of vapor deposition, zinc vapor is plated through an opening 6 on a steel strip 10 which travels in, for example, a right direction above the body 1 of the vapor deposition furnace. Here, molten zinc 7 is heated directly by the heater 8 in the upper part of the inside of the furnace or is heated with a carbon block 11 floating in the zinc 7 and evaporates successively from the surface layer. Thus, the evaporation responds quickly to the change in the rate of heating from the heater 8 and since the time for settling decreases, the generation of off-specification products decreases. The formation of the oxide film on the liquid surface of the zinc is suppressed by the reducing force of the block 11, splashing is made difficult to arise and the sticking of liquid drops upon the products is prevented. |
