| 摘要 |
PURPOSE:To reduce the time for treatment and to decrease the amt. of the treating liquid to be used by feeding the treating liquid into a vessel except some space remaining therein, evacuating the inside of the vessel and heating the vessel from the lower part thereby generating the high-velocity circulation flow of the vapor and liquid of the treating liquid. CONSTITUTION:Objects 21 to be treated are disposed on racks 22 in the vessel. A prescribed amt. of the surface treating liquid 2 is fed into the vessel except some space remaining therein. The gas in the space part is evacuated to reduce the inside pressure. Such vessel is hermetically sealed. The treating liquid 2 is heated by a heater 3 for heating and a refrigerant is passed in a cooling pipe 12 to operate the entire part of the vessel as a heat pipe. The evaporated liquid 2 forms vapor flow 9 which is cooled at a high flow rate by the cooling pipe 12 and moves to the low temp. part. Part of the vapor flow 9 collides against the objects 21 and is liquefied, by which the prescribed surface treatment is executed. The remaining flow 9 collides against the pipe 12 and is condensed by heat radiation to form liquid drops 10-a-10-c which are dropped onto the objects 21. The object surfaces are thus subjected to the prescribed treatment.
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