Patent ID: 8388788

Claim:
A method of winding a holding sealing material, comprising: providing a mat-shaped holding sealing material comprising inorganic fibers; providing an exhaust gas treating body having cell walls extending along a longitudinal direction of the exhaust gas treating body to define cells; and winding the mat-shaped holding sealing material around an outer peripheral portion of the exhaust gas treating body to form multiple layers including a first layer and a second layer wound around the first layer to contact the first layer, each of the multiple layers being shifted along the longitudinal direction in a winding order such that the first layer of the multiple layers is placed closer to one end face of the exhaust gas treating body than the second layer of the multiple layers, a shift between the first layer and the second layer being from about 0.15% to about 15% of a length in a width direction of said holding sealing material, wherein said holding sealing material, in a plan view, comprises a parallelogram with an acute angle α being about 70°≦α<about 90°, and wherein said holding sealing material is wound around the exhaust gas treating body such that one side face of said holding sealing material is substantially parallel to a straight line drawn along a longitudinal direction of the exhaust gas treating body.