A method of making mounting mats comprising the steps of: (i) supplying inorganic fibers through an inlet of a forming box having an open bottom positioned over a forming wire to form a mat of fibers on the forming wire, the forming box having rollers for breaking apart clumps of fibers and an endless belt screen; (ii) capturing clumps of fibers on the endless belt; (iii) conveying captured clumps of fibers on the endless belt so as to enable captured clumps to release from the belt and be broken apart by the rollers; (iv) transporting the mat of fibers out of the forming box by the forming wire; and (v) compressing and restraining the mat of fibers to thereby obtain a mounting mat having a desired thickness suitable for mounting a pollution control element in a pollution control device.

An exhaust gas treatment device for an exhaust gas flow path of an internal combustion engine, includes a tubular carrier body (12) extending along a longitudinal axis (L) of the carrier with a first axial end area (18) and with a second axial end area (20) and at least one exhaust gas treatment element (34) carried in the carrier body (12) with the interposition of at least one fiber material layer (36). The carrier body (2) includes carrier elements (14, 16) connected to one another in a first connection area (22) and in a second connection area (24) that extend from the first axial end area (18) to the second axial end area (20). At least one connection area (22, 24) does not extend in parallel to the longitudinal axis (L) of the carrier from the first axial end area (18) to the second axial end area (20).

Mounting mat (4) for holding a substrate (2) of a pollution control element or chemical reactor (10), the pollution control element or chemical reactor (10) comprising more than one substrate (2), wherein the substrate (2) comprises a front face (2f), a rear face (2r) and at least three flat side faces (4) extending between the front (2f) and the rear face (2r), and wherein the mounting mat (4) is shaped such that it covers at least partially an edge (5) enclosed by two flat side faces (4).

A honeycomb type heating device includes a pillar-shaped honeycomb substrate having a partition wall defining and forming a plurality of cells and a circumferential wall surrounding the partition wall; a plurality of heaters adjacent to each other arranged on a circumferential surface of a circumferential wall in the circumferential direction of the circumferential surface; a connecting body arranged in the circumferential direction of the circumferential surface and electrically connecting the plurality of heaters; and a metal case housing the honeycomb substrate, the plurality of heaters, and the connecting body. Each heater is a resistance-heating type heater, the cross-sectional area of the connecting body in a cross section perpendicular to the circumferential direction of the circumferential surface is 10.0 to 30.0 mm.sup.2, and the thermal expansion coefficient of the connecting body is higher than the thermal expansion coefficient of the honeycomb substrate by 3.0×10.sup.−6/° C. or more.

A catalytic device that can increase the durability of a catalyst support with holes is provided. A flat plate and a corrugated plate have a plurality of holes, a joint area between the flat plate and the corrugated plate is provided in a first upstream area including one end of a catalyst support, and a joint area between the catalyst support and an outer cylinder is provided in a second upstream area that includes the first upstream area and is wider than the first upstream area in the direction of an axis.

An element frame for holding monoliths containing catalysts in the flow of exhaust gases from a combustion source, the element frame comprising two pairs of opposing walls, wherein the walls form a rectangular or square shape, an interior formed by the walls, an inlet end, an outlet end, at least one locking element, at least one mat and at least one monolith comprising an inlet, an outlet, four sides and at least one catalyst effective in reducing the concentration of one or more gases in the exhaust gas, wherein the at least one mat and the at least one monolith being positioned in the interior of the element frame so that there is at least one mat between the monolith and each adjacent wall, each locking element extending across the inlet end or outlet end of the element frame and being connected to two opposite sides of the element frame.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

An emission treatment component support structure for an exhaust system, the support structure comprising: an insulating layer configured to support a substrate of the emission treatment component within a housing; and one or more resistive metal elements provided at least partially within the insulating layer.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

An emission treatment component support structure for an exhaust system, the support structure comprising: an insulating layer configured to support a substrate of the emission treatment component within a housing; and one or more resistive metal elements provided at least partially within the insulating layer.