Filter module and method for its manufacture

A filter module, comprising a depth filter material with introduced arranged openings having boundary surfaces constituting flow-through surfaces,

• the depth filter material being wound about a winding axis and forming a spiral roll,
• wherein the introduced openings, positioned atop one another, of wound layers of the depth 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 depth filter material, and
• 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.