The present invention is suitable for serving as a bulkhead between the two fluids flowing in the plate type heat exchanger relates to a plate (1), the plate (1) includes a lower ridge and the upper ridge comprises a plurality of folds each having (2), and the folds of the plate (1) and (2) are all or part of the upper ridge height comprising locally significant decrease stiffener (5) formed by a locally, the stiffener (5) to the plate (1) according to at least one of a first line (6) parallel to the diagonal (10) of the plate (1) are arranged in a stiffener (5) of the first group 20, which is distributed, the angle 10 is the stiffener (5 folds (2) of the ridges (3,4) orthogonal to each other and the first group (20) to ) comprises a plate that is alternately arranged between the two sides of the first line (6) in each of the successive folds (2), the center of the first line of the stiffener (5) of the first group (20) (6) The distance measured in the direction perpendicular to the first line (6) the same is characterized in that for each of the stiffener (5) of the first group (20). ;
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