VACUUM EVAPORATION DEVICE

摘要

PURPOSE:To enable recovery of the molten metal of a plating material and foreign matter in a vacuum by providing plural suction pipes for the molten metal which are vertically shifted in the attaching part so that the foreign matter in a vapor deposition pan overflows therefrom. CONSTITUTION:A molten metal (plating material) 7 is sucked from a melting furnace 3 via a suction pipe 2 into a vapor deposition pan 4 in a vacuum vessel 1 owing to a pressure difference between the vessel 1 and the atm. The liquid surface in the furnace 3 is maintained at a level L2 and at the same time the liquid surface in a suction pipe 2' attached to the pan 4 upper than the pipe 2 is maintained at a level L3. After the material 7 is further sucked, a lifter 11 is risen and the liquid surface of the material 7 is brought to the position of the level L1 or above, then the foreign matter 13 floating on the surface of the material 7 overflows from the attaching part 12'' of the pipe 2' and is thus removed.