Metal base plate material for heat exchange plate

Abstract

A metal base plate material includes trip-shaped first regions each having a plurality of first ridges arranged substantially parallel to each other and at substantially equal intervals such that an angle of intersection with a longitudinal direction is greater than or equal to 10° and less than or equal to 25°. Strip-shaped second regions each have a plurality of second ridges arranged substantially parallel to each other and at substantially equal intervals and angled to face the plurality of the first ridges in a crosswise direction. The first regions and second regions are separated by a gap regions therebetween, at substantially equal intervals. First ends on a downstream side of the plurality of the first ridges and second ends on a downstream side of the plurality of the second ridges are positioned differently from each other in the longitudinal directions.

1 . A metal base plate material for a heat exchange plate to be built into a plate-type heat exchanger, wherein
 at least one surface is provided with a plurality of strip-shaped first regions and a plurality of strip-shaped second regions, which are provided alternately and in parallel,   the strip-shaped first regions each comprise a plurality of first ridges arranged substantially parallel to each other and at substantially equal intervals such that an angle of intersection with a longitudinal direction is greater than or equal to 10° and less than or equal to 25°,   the strip-shaped second regions each comprise a plurality of second ridges arranged substantially parallel to each other and at substantially equal intervals and angled to face the plurality of the first ridges in a crosswise direction,   the first regions are separated from the second regions adjacent thereto by gap regions therebetween, respectively, at substantially equal intervals, and   when one orientation of longitudinal directions of the first regions and the second regions is defined as a downstream direction, first ends on a downstream side of the plurality of the first ridges and second ends on a downstream side of the plurality of the second ridges are positioned differently from each other in the longitudinal directions.   
     
     
         2 . The metal base plate material according to  claim 1 , wherein
 an average distance between the plurality of the first ridges is greater than or equal to 0.1 mm and less than or equal to 1.0 mm,   an average distance between the plurality of the second ridges is greater than or equal to 0.1 mm and less than or equal to 1.0 mm, and   an average distance between the first regions and the second regions is greater than or equal to 0.2 mm and less than or equal to 4.0 mm.   
     
     
         3 . The metal base plate material according to  claim 1 , wherein an amount of positional difference longitudinally between the first ends and the second ends is greater than or equal to 0.1 mm and less than or equal to 5.8 mm. 
     
     
         4 . The metal base plate material according to  claim 1 , wherein an angle of intersection of the second ridges with the longitudinal direction of the second regions is equal to an absolute value of the angle of intersection of the first ridges.