Abstract: A functional component of a fluid filter is provided with at least one component connection element of a mechanical connection device, wherein the at least one component connection element can be connected releasably to at least one corresponding housing connection element of the mechanical connection device by a rotation/push-in movement about a virtual axis. The at least one corresponding housing connection element is provided at a filter housing of the fluid filter. The at least one component connection element has at least one securing contour that interacts with at least one joining element to secure the mechanical connection device and prevent an accidental release of the mechanical connection device, wherein the at least one joining element is connected to the filter housing after the functional component has been mounted at the filter housing.

Abstract: A filter insert for a filter for filtering a fluid having] an inflow surface, and outflow surface, and a main throughflow direction. A filter body of the insert has a filter medium with pleats forming a pleated bellows, are arranged perpendicular to the main throughflow direction. A first number of the pleat edges form the outflow surface and a second number of the pleat edges on a pre-filtration side of the filtration body form the outflow surface. A first seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration on a surface formed by a first number of of end face of the pleats. A second seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration side on a surface formed by a second number of end faces of the pleats.

Abstract: A filter element for filtering liquids has a folded filter medium with outer fold edges and inner fold edges, wherein the inner and outer fold edges extend along a longitudinal axis of the filter element. A support body is provided with a first support body section and a second support body section, wherein the first support body section is facing the inner fold edges and hugs closely an envelope of the inner fold edges. An envelope of the outer fold edges and the second support body section hug closely at least sectionwise an outer circumferential surface of the filter element.

Abstract: A filter element is provided with a folded bellows that has a first pleated section with parallel arranged first pleats and a second pleated section with parallel arranged second pleats. The first pleats of the first pleated section are positioned at an angle relative to the second pleats of the second pleated section. The end face edges of the first pleats of the first pleated section adjoin a first clean chamber. The end face edges of the second pleats of the second pleated section adjoin a second clean chamber. The second clean chamber is delimited by a longitudinal side of an edge-side pleat of the first pleated section. The first and second clean chambers are connected to each other. A filter insert with such a filter element is provided.

Abstract: A filter insert piece has a filter element with first and second pleated sections each having parallel pleats. The first and second pleated sections each have an inflow side. A first flat outflow side of the first pleated section and a second flat outflow side of the second pleated section adjoin a common clean chamber of the filter element. A length of the pleats of the first and second pleated sections is such that a spacing of an outwardly positioned pleat end face of the pleats at the first or second inflow side, respectively, relative to the center axis increases or decreases monotonic from pleat to pleat. The respective end pleats of the first and of the second pleated sections have a different length extension measured from the outwardly positioned pleat end face of the first end pleats or the second end pleats relative to the center axis.

Abstract: A filter insert piece has a filter element with first and second pleated sections each having parallel pleats. The first and second pleated sections each have an inflow side. A first flat outflow side of the first pleated section and a second flat outflow side of the second pleated section adjoin a common clean chamber of the filter element. A length of the pleats of the first and second pleated sections is such that a spacing of an outwardly positioned pleat end face of the pleats at the first or second inflow side, respectively, relative to the center axis increases or decreases monotonic from pleat to pleat. The respective end pleats of the first and of the second pleated sections have a different length extension measured from the outwardly positioned pleat end face of the first end pleats or the second end pleats relative to the center axis.

Abstract: A filter element is provided with a folded bellows that has a first pleated section with parallel arranged first pleats and a second pleated section with parallel arranged second pleats. The first pleats of the first pleated section are positioned at an angle relative to the second pleats of the second pleated section. The end face edges of the first pleats of the first pleated section adjoin a first clean chamber. The end face edges of the second pleats of the second pleated section adjoin a second clean chamber. The second clean chamber is delimited by a longitudinal side of an edge-side pleat of the first pleated section. The first and second clean chambers are connected to each other. A filter insert with such a filter element is provided.

Abstract: A filter element for filtering liquids has a folded filter medium with outer fold edges and inner fold edges, wherein the inner and outer fold edges extend along a longitudinal axis of the filter element. A support body is provided with a first support body section and a second support body section, wherein the first support body section is facing the inner fold edges and hugs closely an envelope of the inner fold edges. An envelope of the outer fold edges and the second support body section hug closely at least sectionwise an outer circumferential surface of the filter element.

Abstract: A filter insert for a filter for filtering a fluid having] an inflow surface, and outflow surface, and a main throughflow direction. A filter body of the insert has a filter medium with pleats forming a pleated bellows, are arranged perpendicular to the main throughflow direction. A first number of the pleat edges form the outflow surface and a second number of the pleat edges on a pre-filtration side of the filtration body form the outflow surface. A first seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration on a surface formed by a first number of of end face of the pleats. A second seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration side on a surface formed by a second number of end faces of the pleats.

Abstract: A filter element for liquid filtration has a first layer and a second layer. The first and second layers are arranged one behind the other in the direction of flow. The first layer is a filter layer of cellulose, and the second downstream layer is a nonwoven of plastic fibers, wherein the second layer has a smaller thickness than the first layer.

Abstract: A compact filter has a compact filter element for exchangeable use in a filter housing and the compact filter element has a filter body of a web-shaped filter medium. The web-shaped filter medium has at least one flat filter medium web and one corrugated filter medium web that are placed onto each other and at least partially connected to each other by ultrasonic welding. At least one of the flat and corrugated filter medium webs is a composite filter medium web of at least two components, wherein at least one component is a synthetic material and one component is a non-synthetic material. The non-synthetic material is a plant-derived material and forms a support of the composite filter medium web and the synthetic material is a synthetic layer applied on the support.

Abstract: The invention relates to a filtering device, comprising a tubular filter element and a carrier part, with the filter element fastened thereon. The carrier part can be inserted between an unfiltered fluid pipe and a filtered fluid pipe. The pipes can be assembled into a continuous flow pipe, wherein the filter element protrudes into the pipe interior.

Abstract: The invention relates to a filter arrangement (1) for filtering a fluid, e.g. combustion air for a combustion engine. Said filter arrangement has several tubular sections or segments (2, 3). At least part of a wall (4) of at least one tubular section (2) comprises a filter material (4B). At least one tubular section (3) is designed in a bendable manner like a folding joint (5A).

Abstract: A compact filter has a compact filter element for exchangeable use in a filter housing and the compact filter element has a filter body of a web-shaped filter medium. The web-shaped filter medium has at least one flat filter medium web and one corrugated filter medium web that are placed onto each other and at least partially connected to each other by ultrasonic welding. At least one of the flat and corrugated filter medium webs is a composite filter medium web of at least two components, wherein at least one component is a synthetic material and one component is a non-synthetic material. The non-synthetic material is a plant-derived material and forms a support of the composite filter medium web and the synthetic material is a synthetic layer applied on the support.

Abstract: In a method for stabilizing folded filter media, a thread is coated with a hot melt adhesive to prepare a coated thread. The coated thread is wound in a plastic state about fold tips of a folded filter medium. The plastic state of the coated thread is maintained by applying heat. The heat is applied in the form of hot air, infrared radiation, or generated by microwaves.

Abstract: The invention relates to a filter arrangement (1) for filtering a fluid, e.g. combustion air for a combustion engine. Said filter arrangement has several tubular sections or segments (2, 3). At least part of a wall (4) of at least one tubular section (2) comprises a filter material (4B). At least one tubular section (3) is designed in a bendable manner like a folding joint (5A).

Abstract: A filter element for cleaning a fluid having a pleated filter medium designed for radial flow, to the outside of which a circumferential reinforcing thread is applied. The outside of the filter medium is divided into two axial sections, to which the reinforcing thread is applied in a plurality of circumferential thread windings, such that the axial distance between directly adjacent thread windings differs in the two sections.

Abstract: An air filter for internal combustion engines and interiors of motor vehicles has a filter insert in the form of a bellows of filter material folded in a zigzag shape by a first folding, wherein the bellows has a plurality of neighboring pockets extending in a longitudinal direction of the bellows, wherein between the pockets first folds are formed at ridges between the pockets. A seal is connected to the bellows. The folded filter material has a second folding in a direction transverse to the longitudinal direction and second folds are formed by the second folding that extend substantially transversely to the longitudinal direction. End faces extending transversely to the longitudinal direction are formed by cutting the bellows to a desired length. The seal extends across the end faces and longitudinal sides of the bellows.

Abstract: The invention relates to a filtering device, comprising a tubular filter element and a carrier part, with the filter element fastened thereon. The carrier part can be inserted between an unfiltered fluid pipe and a filtered fluid pipe. The pipes can be assembled into a continuous flow pipe, wherein the filter element protrudes into the pipe interior.

Abstract: A filter device for filtering air in internal combustion engines equipped with a filter that can be inserted into a filter housing and has a flame-retardant effect. The filter comprises a main filter element and an upstream filter fleece whereby the flame-retardant effect is achieved by the fleece prefilter.