Patent ID: 7883572

Claim:
Cleanable filter ( 1 ) for particulate material comprising a zigzag pleated filter pack ( 2 ), spacers ( 6 ) disposed between the pleats in the filter pack and a frame ( 3 ) having an upper ( 4 ) and lower part covering the respective upper and lower side of said filter pack that contains the ends of the fold lines and two lateral parts covering the opposite sides of said filter pack that contains the ends of the filter medium ( 5 ) zigzag folded into a filter pack, said frame ( 3 ) thereby leaving the opposite sides of the filter pack that contains alternate fold lines of the pleated filter pack, free for the passage of air, characterised in that the filter medium ( 5 ) in the filter pack include a pleated sheet of polytetrafluorethylene (PFTE), in that the spacers ( 6 ) between the pleats consist of corrugated aluminium foils and in that an element ( 7 ) electrically connects the aluminium foils to each other and to an earth connection on the outside of the filter frame ( 3 ).