Method of manufacturing a heat exchanger body for recuperative exchangers

Method for manufacturing a heat exchanger body for recuperative heat exchangers for two gaseous media, which body is of the type containing a number of superimposed sheets which are corrugated to form channels for the media to flow through, the sheets being arranged so that the corrugations in neighbouring sheets cross each other to form channels passing through the heat exchanger body in two directions, and the juxtaposed edges of the sheets being displaced and joined to the corresponding edges of the neighbouring sheets so that the edges on the same side of the body alternately are sealed together and form openings to admit the heat exchange medium to the channels, characterized in that the sheets (12) are first corrugated all over and cut to the desired dimensions, and that the edges (23 -26) are then compressed flat in such a manner that opposite ends of the sheet are in the same plane and adjacent ends of the sheet are in different but parallel planes, and at the same time or subsequently the juxtaposed edges (23 and 24, or 25 and 26, respectively) are displaced in the same direction, but in the opposite direction to the other pair of juxtaposed edges (25 and 26, or 23 and 24, respectively), whereafter the desired number of sheets are assembled into the heat exchanger body (10) and those displaced edges of neighbouring sheets (12) which bear on each other are joined and sealed.