Patent ID: 7267329

Claim:
An assembly of a plurality of generally vertically adjacent layers of structured packing, each layer comprising a plurality of generally horizontally adjacent structured packing elements, each structured packing element having an upper edge and a lower edge opposite the upper edge, and each layer having a top comprising a plurality of the upper edges and a bottom comprising a plurality of the lower edges, the assembly comprising: a first layer of structured packing, wherein at least one of the upper edge and the lower edge is modified on at least one structured packing element in the first layer; and a second layer of structured packing located vertically adjacent the first layer of structured packing, wherein the upper edges and the lower edges are unmodified on substantially all of the structured packing elements in the second layer, whereby one of the unmodified upper edge and the unmodified lower edge on at least one of the structured packing elements in the second layer is adjacent one of the modified edges in the first layer.