| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To facilitate generation of nucleation boiling and achieve very excellent heat conductivity. <P>SOLUTION: The original plate material for a heat-exchange plate 4 is the original plate material composed of a titanium flat plate material which has minuscule convexoconcave formed on a surface thereof, undergoes a press process as a post-process, thereafter is formed into a heat-exchange plate, and convexes 5 have a plurality of side walls 7. For the convexes 5, at least one or more top parts 9 are formed in a plan view at a crossing portion between one side wall 7a and the other side wall 7b adjacent to the side wall 7a. The convexes 5 are each formed in a polygon in a plan view by the side wall 7. An angleθof the top part 9 composed by the one side wall 7a and the other side wall 7b is 140 degrees or below. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
