Filter
A filter ( 1 ) includes a filter element ( 2 ) having a filter member ( 10 ) with a tubular shape disposed on the outer side of a porous tube ( 7 ), and the filter member ( 10 ) includes an embossed portion ( 21 ) formed on a surface of the filter member ( 10 ).
1 . A filter comprising a filter element having a filter member with a tubular shape disposed on an outer side of a porous tube, wherein the filter member has an embossed portion formed on a surface of the filter member.
2 . The filter according to claim 1 , wherein the filter member is a sheet-like member, and is wound around the porous tube.
3 . The filter according to claim 2 , wherein the filter element includes a wound laminated sheet of the filter member and a net-like substrate.
4 . The filter according to claim 2 , wherein in the filter element, the filter member is continuously laminated in a radial direction.
5 . The filter according to claim 2 , wherein, in the filter element, a plurality of the filter members having different ventilation resistances are laminated in the radial direction and wound.
6 . The filter according to claim 2 , wherein the filter member has pores.
7 . The filter according to claim 1 , wherein the filter member is disposed on the outer side of the porous tube, the filter member being folded into a pleated shape.