Patent ID: 8215494

Claim:
A filter module, comprising a spiral roll of depth filter material with introduced arranged openings wound with compression about a winding axis, wherein the introduced arranged openings have boundary surfaces in the compressed depth filter material and the boundary surfaces of the openings constitute flow-through surfaces, wherein the introduced arranged openings, positioned atop one another, of the wound layers of the filter material form groups of channels angled relative to the winding axis, one group of channels opening at an outer peripheral surface of the spiral roll and the other group of channels opening at an inner peripheral surface of the spiral roll and wherein the channels are closed at their other end, respectively, and the channels, angled relative to the winding axis, are separated from one another by the filter material, wherein the spiral roll has an inner area comprising a central channel arranged around the winding axis; the module having a radial direction wherein, in the radial direction of the filter module, a border layer adjoins the openings and separates the inner area and the outer area from one another, and wherein the border layer comprises depth filter material and has a thickness (a, b) in the radial direction which matches at least the effective filter thickness (d) of a depth filter layer in the axial direction.