Patent ID: 6544310
Filing Date: 2003-04-08
Classification: C04B,F01N,Y02T,Y10S

Abstract:
An exhaust aftertreatment filter for filtering engine exhaust flowing along an axial direction, said filter being composed of regenerable material regenerated by heat to burn-off trapped contaminant particulate from said engine exhaust, comprising an axially extending cylindrical filter roll having a plurality of concentric layers with pleats therebetween defined by wall segments extending radially in corrugated serpentine manner between pleat tips at axially extending bend lines, said wall segments extending axially between upstream and downstream ends, said wall segments defining axial flow channels therebetween, said wall segments being alternately sealed to each other by a first upstream set of plugs to define a first set of flow channels closed by said plugs, and a second set of flow channels interdigitated with said first set of flow channels and having open upstream ends, said wall segments being alternately sealed to each other by a second downstream set of plugs closing said second set of flow channels, said first set of flow channels having open downstream ends, one of said sets of plugs being provided in a step pattern having a plurality of steps of varying axial spacing from an axial end of said filter roll, wherein said filter roll is spiral-wound from a sheet having said corrugated serpentine pleats thereon, said first and second sets of plugs being provided by first and second axially spaced sealing beads extending transversely across said pleats, one of said beads extending diagonally across said pleats and providing said step pattern when rolled, said step pattern having a V-shape in cross-section of said filter roll.