| 摘要 |
PURPOSE:To eliminate the need for pressure difference chamber, and to obtain compact equipment, by cooling a steel strip by radiation heat transfer from the strip to a roll by improving radiation ratio of roll surface. CONSTITUTION:In a vacuum cooling chamber 4, the steel strip 13 is passed to cooling rolls 12 whose surface is subjected to treatment for improving radiation ratio to cool the strip 13. Further, favorably, the strip 13 to be continuously surface treated by vapor deposition, etc., is cooled in vacuum. Black Cr or black Ni galvanizing is favorable to treatment for improving radiation ratio of the roll 12. By such a method, the strip 13 is cooled by radiation heat transfer to the roll 12 therefrom without relying on thermal conduction through gaseous layer existing between the roll 12 and the strip 13 and the need for pressure difference chambers between vapor deposition chambers 2, 6 and the chamber 4 are eliminated, thus obtaining the compact equipment.
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