Patent ID: 9656313
Date: 2017-05-23
CPC Classifications: B21D,F28F,Y10T

Claim:
1. An original plate material for a heat-exchanging plate, the original plate material comprising: a recessed part and projecting parts on a surface of a titanium flat plate material, the original plate material being subject to press working so as to be used as a heat-exchanging plate, wherein the projecting parts are formed so as to be arranged in a staggered manner in plan view on the surface of the flat plate material such that a first line connecting centers of the projecting parts adjacent to each other in a lateral direction is not perpendicular to a second line connecting the centers of the projecting parts in a vertical direction, and wherein the recessed part and the projecting parts are formed such that, when a height of the projecting parts is Rz in μm, a width of the recessed part, defined as a shortest distance between the projecting parts adjacent to each other in the lateral or vertical direction, is L in μm, and a pitch, defined as a distance between the centers of the projecting parts adjacent to each other, is P in μm, a shape parameter defined by Rz×L/P is 4 μm to 12 μm.