Filter for filtering fluids

1. A filter for filtering a liquid or gaseous fluid comprising:

a filter element ( 1 ) with a zigzag-folded filter medium ( 14 ; 106 ) including

a raw side ( 105 ); and

a clean side ( 104 );

a plurality of filter medium sections ( 120 ) joined to neighboring filter medium sections ( 120 ) along fold edges (F);

a plurality of elongated adhesive sections ( 122 ) arranged on said filter medium ( 14 ; 106 ) and extending along at least two lines of adhesive ( 101 ), said at least two lines of adhesive ( 101 ) extending at least sectionwise at a slant or perpendicular to fold edges (F) of the filter medium;

wherein on each line of said at least two lines of adhesive ( 101 ) at least one adhesive section ( 122 ) and at least one interruption ( 107 ) of the adhesive are arranged;

wherein said interruptions ( 107 ) of said adhesive of the different lines of adhesive ( 101 ), viewed in the direction of the fold edges (F), are displaced relative to each other such that by the interruptions ( 107 ) of the adhesive in said filter medium section ( 120 ) that extends between two neighboring fold edges (F) no passage ( 126 ) extending continuously parallel to the fold edges (F) is realized.

2. The filter according to claim 1 , wherein

said passage ( 126 ) extends in a zigzag pattern on said folded filter medium;

wherein said zigzag is any of a V-shape or a U-shape zigzag pattern.

3. The filter according to claim 2 , wherein

said lines of adhesive are straight lines of adhesive ( 101 ) that extend parallel to each other and perpendicular to the fold edges (F).

4. The filter according to claim 3 , wherein

said lines of adhesive ( 101 ) are equidistantly arranged.

5. The filter according to claim 3 , wherein

spacings ( 132 a , 132 b , 132 c , 132 d ) of neighboring lines of adhesive ( 101 ), viewed in the direction of the fold edges (F), increase or decrease from one end face ( 136 a ) of said filter element ( 1 ) to an opposing end face ( 136 b ) of said filter element.

6. The filter according to claim 3 , wherein

spacings ( 132 e , 132 f , 132 g ) of neighboring lines of adhesive ( 101 ) increase in particular in outward direction relative to a mirror plane ( 138 ) that extends perpendicularly to the fold edges (F);

wherein said mirror plane is positioned centrally relative to extension of said filter medium ( 14 ; 106 ) in direction of said fold edges (F).

7. The filter according to claim 1 , wherein

at said raw side ( 105 ) and at said clean side ( 104 ) said adhesive sections ( 122 ) are arranged such that

at least one of said adhesive sections ( 122 ) at said raw side ( 5 ) projects on both of said raw and clean sides past at least one of said interruptions ( 107 ) of the adhesive on said clean side ( 104 ) and overlaps with its ends said adhesive sections ( 122 ) at said clean side ( 104 ) that adjoin said interruption ( 107 ) of said adhesive, and/or at least one of said adhesive sections ( 122 ) at said clean side ( 104 ) projects at both sides past at least one of the interruptions ( 107 ) of the adhesive at the raw side ( 5 ) and overlaps with its ends the adhesive sections ( 122 ) at the raw side ( 105 ) that adjoin the interruption ( 107 ) of the adhesive.

8. The filter according to claim 1 , wherein

each of said adhesive sections has a respective height ( 144 );

said respective height ( 144 ) of said adhesive sections ( 122 ) varies perpendicularly to the filter medium ( 14 ; 106 ) along said line of adhesive ( 101 ) so that said adhesive sections ( 122 ), when the filter medium ( 14 ; 106 ) is folded, each are positioned with their free side facing away from the filter medium ( 14 ; 106 ) on an correspondingly positioned free side of an adhesive section ( 122 ) that is oppositely positioned in an intermediate fold space ( 148 a , 148 b ) or on the surface of the medium section ( 122 ) oppositely positioned in the intermediate fold space ( 148 a , 148 b ).

9. The filter according to claim 1 , wherein

said filter medium sections ( 120 ) that extend on both sides from raw-side fold tips ( 102 a ) to neighboring raw-side fold bases ( 103 a ), viewed from said raw-side fold tips ( 102 a ), respectively, have a first bend ( 552 ) toward the raw side ( 105 ) and therebehind a second bend ( 554 ) toward the clean side ( 104 ).

10. The filter according to claim 1 , wherein

at said raw side ( 105 ) a plurality of elongate depressions ( 656 ) are formed in the filter medium ( 14 ; 106 ) that extend between raw-side fold tips ( 102 a ) and raw-side fold bases ( 103 a ) approximately perpendicularly to said fold edges (F) of said filter medium ( 14 ; 106 ) and at said clean side ( 104 ) realize corresponding projections ( 658 ) in such a way that in a raw-side intermediate fold space ( 148 a ) two depressions ( 656 ) on the two medium sections ( 120 ) delimiting intermediate fold space ( 148 a ) are positioned directly opposite each other and partially form a flow passage ( 660 ), respectively.

11. The filter according to claim 2 , wherein

said lines of adhesive are straight lines of adhesive ( 101 ) that extend parallel to each other and perpendicular to the fold edges (F).

12. The filter according to claim 4 , wherein

at said raw side ( 105 ) and at said clean side ( 104 ) said adhesive sections ( 122 ) are arranged such that

at least one of said adhesive sections ( 122 ) at said raw side ( 5 ) projects on both of said raw and clean sides past at least one of said interruptions ( 107 ) of the adhesive on said clean side ( 104 ) and overlaps with its ends said adhesive sections ( 122 ) at said clean side ( 104 ) that adjoin said interruption ( 107 ) of said adhesive, and/or at least one of said adhesive sections ( 122 ) at said clean side ( 104 ) projects at both sides past at least one of the interruptions ( 107 ) of the adhesive at the raw side ( 5 ) and overlaps with its ends the adhesive sections ( 122 ) at the raw side ( 105 ) that adjoin the interruption ( 107 ) of the adhesive.

13. The filter according to claim 4 , wherein

each of said adhesive sections has a respective height ( 144 );

said respective height ( 144 ) of said adhesive sections ( 122 ) varies perpendicularly to the filter medium ( 14 ; 106 ) along said line of adhesive ( 101 ) so that said adhesive sections ( 122 ), when the filter medium ( 14 ; 106 ) is folded, each are positioned with their free side facing away from the filter medium ( 14 ; 106 ) on an correspondingly positioned free side of an adhesive section ( 122 ) that is oppositely positioned in an intermediate fold space ( 148 a , 148 b ) or on the surface of the medium section ( 122 ) oppositely positioned in the intermediate fold space ( 148 a , 148 b ).

14. The filter according to claim 13 , wherein

said filter medium sections ( 120 ) that extend on both sides from raw-side fold tips ( 102 a ) to neighboring raw-side fold bases ( 103 a ), viewed from said raw-side fold tips ( 102 a ), respectively, have a first bend ( 552 ) toward the raw side ( 105 ) and therebehind a second bend ( 554 ) toward the clean side ( 104 );

wherein at said raw side ( 105 ) a plurality of elongate depressions ( 656 ) are formed in the filter medium ( 14 ; 106 ) that extend between raw-side fold tips ( 102 a ) and raw-side fold bases ( 103 a ) approximately perpendicularly to said fold edges (F) of said filter medium ( 14 ; 106 ) and at said clean side ( 104 ) realize corresponding projections ( 658 ) in such a way that in a raw-side intermediate fold space ( 148 a ) two depressions ( 656 ) on the two medium sections ( 120 ) delimiting intermediate fold space ( 148 a ) are positioned directly opposite each other and partially form a flow passage ( 660 ), respectively.