Patent ID: 8752290

Claim:
A method of installing a mat within an exhaust gas aftertreatment or acoustic device having an inner surface extending in an axial direction and a surrounding outer surface, said inner and outer surfaces being substantially cylindrical and substantially coaxial, the method comprising the steps of: completely wrapping the mat a first time around the inner surface, said mat having a width in the axial direction between first and second sides which is substantially said axial length in the axial direction and said first and second sides of said mat first wrap generally lying in first and second planes, respectively, perpendicular to said axis; continuing to wrap the mat around itself, said continued wrapping being telescopic such that the first and second sides of each successive wrap of the mat are offset in the axial direction a distance from the first and second sides, respectively, of an underlying wrap of the mat; completing wrapping of the mat by wrapping the mat a final time around the outermost telescopic wrap so that the first and second sides of the mat of the final wrap lie in third and fourth planes generally parallel to the first and second planes, wherein said third plane is between said first and second planes; and compressing the mat between the inner and outer surfaces while translating the inner and outer surfaces relative to each other in the axial direction wherein the compressing and translating step substantially aligns the sides of all of said wraps of said mats in said first and second planes.