Patent ID: 7055587

Claim:
A heat exchanger plate ( 4 ) for a plate heat exchanger ( 1 ), the plate comprising an edge, which extends around the plate ( 4 ), an edge area ( 6 ), which extends around the plate inside the edge, and a heat exchanging surface ( 5 ) with a corrugation of ridges and valleys, which extend in at least a first direction (A, B) over the plate, wherein the plate includes a support area ( 41 ), which extends around the heat exchanging surface ( 5 ) inside the edge area ( 6 ) and includes a corrugation of ridges ( 42 ) and valleys ( 43 ), and wherein the plate ( 4 ) includes a marked border line ( 44 ) between the heat exchanging surface ( 5 ) and the support area ( 41 ), and further wherein the plate ( 4 ) is substantially square and has four side edges ( 7 ′, 7 ″) and four corners, wherein a first two ( 7 ′) of said side edges are parallel and folded in a first direction along a respective folding line extending in said edge area ( 6 ) in parallel with the first side edges ( 7 ′), wherein a second two ( 7 ″) of said side edges are parallel and folded in a second direction along a respective folding line extending in said edge area ( 6 ) in parallel with the second side edges ( 7 ″) and wherein the first direction is opposite to the second direction.