| 摘要 |
In one embodiment, an exhaust treatment device comprises: a housing, a substrate disposed within the housing, and a mat wrapped around the substrate in a helical configuration, wherein the mat has a length that is greater than or equal to about three times the mat width and is disposed between the substrate and the housing. In another embodiment, a method for producing an exhaust treatment device comprises winding a mat around a substrate in a helical configuration to form a substrate/mat sub-assembly and disposing said substrate/mat sub-assembly in a housing. The mat has a length that is greater than or equal to about three times the mat width and is disposed between the substrate and the housing.
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