Air filter element and method for producing same

A method for producing an air filter element, the method comprising:

• a) rolling up at least one length of filter medium having a constant width, to produce a filter medium pack of a substantially tubular shape with a first side and second side;
• and
• b) arranging a guiding rim comprising a sealing surface having at least a radial component on at least one of said first side and said second side, said sealing surface being configured to provide radial sealing when installed in a suitably shaped cavity;
• c) wherein a circumference of the guiding rim comprises at least a convex portion and at least a concave portion;
• and
• d) wherein a contour of said filter medium pack corresponds to said convex portion of said guiding rim and at least part of said concave portion.

An air filter element comprising:

• a) a filter medium pack being formed from coiled fluted filter media, the filter medium pack having an outer circumference defining a convex portion and a concave portion;
• b) a first guiding rim mounted to a first end of the filter medium pack, the first guiding rim defining a convex portion corresponding to the filter medium pack convex portion and defining a concave portion corresponding to the filter medium pack concave portion;
• and
• c) a seal portion supported by the first guiding rim, the seal portion defining an outwardly directed radial sealing surface.

An air filter element comprising:

• a) a filter medium pack comprising a filter medium, said filter medium pack having a first side and a second side;
• and
• b) a guiding rim comprising a sealing surface having at least a radially oriented component, arranged on at least one of said first side and said second side, said sealing surface being configured to provide radial sealing when installed in a suitably shaped cavity;
• c) wherein said filter medium pack has a substantially tubular shape, comprising shapes obtained by one of rolling a length of filter medium, shapes obtained by arranging pleated filter media as a tube, and shapes obtained by combining multiple units that are substantially tubular;
• and
• d) wherein a circumference of the guiding rim comprises at least one convex portion and at least one concave portion, and wherein a contour of said filter medium pack corresponds to said convex portion of said guiding rim and at least part of said concave portion.