Packing for heat- and material-exchange columns

A packing for a heat-exchange or mass-transfer column, comprising:

• a multiplicity of corrugated sheets disposed generally vertically with lateral surfaces juxtaposed with one another and ribs of adjacent sheets formed by the corrugations crossing each other and contacting one another, said sheets having upper horizontal edges, and the corrugations having patterns such that:
• the ribs at an upper region of each of said sheets are straight, mutually parallel and oblique to the respective upper edge, and at a lower region of each sheet the ribs are curved in respective arcs running to a lower edge of each sheet;
• longitudinal axes of upper ends of said ribs of each sheet each include an angle of 30° to 70° with the respective upper edge;
• and
• longitudinal axes of lower ends of said ribs of each sheet each include an angle of 75° to 90° with the respective lower edge.