Exhaust gas treatment device and method for making the same
First Claim
1. A device for treatment of exhaust gases comprising:
- a housing;
a fragile structure resiliently mounted within said housing; and
a non-intumescent mounting mat disposed in a gap between said housing and said fragile structure, wherein said mounting mat includes melt-formed, leached, and heat treated glass fibers containing at least 67 percent by weight silica wherein said mounting mat exerts a minimum holding pressure for holding said fragile structure within said housing of one of (i) at least about 10 kPa after 1000 cycles of testing at a hot face temperature of about 900°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 5 percent, or (ii) at least about 50 kPa after 1000 cycles of testing at a hot face temperature of about 300°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 2 percent.
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Accused Products
Abstract
A device (10) for treatment of exhaust gases includes a housing (12); a fragile structure (18) resiliently mounted within the housing (12); and a non-intumescent mounting mat (20) disposed in a gap between the housing (12) and the fragile structure (18). The mounting mat (20) comprises melt-formed, leached glass fibers high in silica content and exerts a minimum holding pressure for holding the fragile structure (18) within the housing (12) of one of (i) at least 10 kPa after 1000 cycles of testing at a hot face temperature of 900° C., a gap bulk density of between 0.3 and 0.5 g/cm3, and a percent gap expansion of 5 percent, and (ii) at least 50 kPa after 1000 cycles of testing at a hot face temperature of 300° C., a gap bulk density of between 0.3 and 0.5 g/cm3, and a percent gap expansion of 2 percent.
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Citations
22 Claims
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1. A device for treatment of exhaust gases comprising:
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a housing; a fragile structure resiliently mounted within said housing; and a non-intumescent mounting mat disposed in a gap between said housing and said fragile structure, wherein said mounting mat includes melt-formed, leached, and heat treated glass fibers containing at least 67 percent by weight silica wherein said mounting mat exerts a minimum holding pressure for holding said fragile structure within said housing of one of (i) at least about 10 kPa after 1000 cycles of testing at a hot face temperature of about 900°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 5 percent, or (ii) at least about 50 kPa after 1000 cycles of testing at a hot face temperature of about 300°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 2 percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of making a device for treating exhaust gases, comprising:
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providing a mounting mat comprising melt-formed glass fibers containing silica, wherein the melt-formed glass fibers are formed by treating the melt-formed glass fibers whereby the treated glass fibers have a silica content greater than the silica content of the glass fibers prior to being treated and whereby the treated glass fibers contain at least 67 percent by weight silica; heat treating the leached glass fibers prior to formation of the mounting mat, or heat treating the mounting mat, prior to wrapping the fragile structure; wrapping the mounting mat around a fragile structure adapted for treating exhaust gases; and disposing the fragile structure and the mounting mat within a housing, whereby the mounting mat holds the fragile structure resiliently within the housing, and wherein the mounting mat exerts a minimum holding pressure for holding said fragile structure within said housing of one of (i) at least about 10 kPa after 1000 cycles of testing at a hot face temperature of about 900°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 5 percent, or (ii) at least about 50 kPa after 1000 cycles of testing at a hot face temperature of about 300°
C., a gap bulk density of from about 0.3 to about 0.5 g/cm3, and a percent gap expansion of about 2 percent. - View Dependent Claims (20, 21, 22)
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Specification