Variable basis weight mounting mat or pre-form and exhaust gas treatment device
AssigneeUnifrax I LLC
InventorSergio David FERNANDES, JR.
Life of this patent
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Abstract
An exhaust gas treatment device includes a housing, a fragile element disposed within the housing, and a mounting mat disposed between the fragile element and the housing for maintaining the positioning of the fragile element, absorbing mechanical shock, and providing thermal insulation. The mounting mat includes a layer or sheet of inorganic fibers with a portion of the layer having a first basis weight and another portion having a second basis weight that is different from the first basis weight. The mat or a vacuum formed insulating pre-form having a variable basis weight in certain regions may be used as end cone insulation in exhaust gas treatment devices.
Claims46
A mat for use as a mounting mat or end cone insulation in an exhaust gas treatment device, said mat comprising a sheet of inorganic fibers having opposite first and second major surfaces, a length, a width and an uncompressed thickness, and wherein said sheet comprises a first portion having a first uncompressed basis weight and a second portion having a second uncompressed basis weight that is greater than the first basis weight.
The mat of claim of 2, wherein said non-intumescent sheet is a cut or stamped monolithic sheet having areas of differing basis weight.
A molded three-dimensional insulation pre-form for use as end cone insulation in an exhaust gas treatment device, said pre-form comprising a cast of inorganic fibers and binder, wherein said pre-form comprises a first portion having a first uncompressed basis weight and a second portion having a second uncompressed basis weight that is greater than the first basis weight.
An exhaust gas treatment device comprising:
- a housing;
- a fragile structure located within the housing;
- and
- a mounting mat disposed in a gap between said housing and said fragile structure comprising a sheet of inorganic fibers having opposite first and second major surfaces, a length, a width and an uncompressed thickness, and wherein said sheet comprises a first portion having a first uncompressed basis weight and a second portion having a second uncompressed basis weight that is greater than the first basis weight.
The exhaust gas treatment device of claim of 17, wherein said non-intumescent sheet is a cut or stamped monolithic sheet having areas of differing basis weight.
An exhaust gas treatment device comprising:
- a housing;
- a fragile structure located within the housing;
- and
- a mounting mat disposed in a gap between said housing and said fragile structure;
- a double walled end cone housing;
- and
- an insulation mat or molded three dimensional insulation pre-form disposed between the walls of the end cone housing, said mat or pre-form having a first portion having a first uncompressed basis weight and a second portion having a second uncompressed basis weight that is greater than the first basis weight.
An end cone for an exhaust gas treatment device comprising:
- outer metallic cone;
- an inner metallic cone;
- and
- an insulation mat or molded three dimensional insulation pre-form disposed between said outer and inner metallic end cones, said mat or end cone comprising a first portion having a first uncompressed basis weight and a second portion having a second uncompressed basis weight that is greater than the first basis weight.
The end cone of claim of 32, wherein said non-intumescent sheet is a cut or stamped monolithic sheet having areas of differing basis weight.
Dependencies are inferred from the claim text.