Frustum-shaped insulation for a pollution control device
AssigneesBGF Industries, Inc., Belchem Fiber Materials GmbH
InventorsSteven P. Witschen, Jacen W. Busick, Robin Richter
Life of this patent
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Abstract
A preformed insulation mat is provided for use between the inner and outer end cone housing of a pollution control device. The preformed insulation includes a frustum-shaped mat. The mat is formed of primarily heat moldable, silica based glass fibers containing Al2O3 and is molded at a selected temperature and for a selected time duration to heat set the fibers, whereby the frustum-shaped mat is seamless and self-supporting, requiring no shape no shape retaining elements or chemical binders.
Claims15
A preformed insulation mat for use between the inner and outer end cone housing of an exhaust emission control device, comprising:
- (a) a molded frustum-shaped mat having a substantially centrally formed opening;
- (b) the mat being binderless and comprising primarily heat moldable, silica based glass fibers containing Al2O3;
- and
- (c) wherein the frustum-shaped mat of glass fibers is molded at a temperature of between about 400 degrees Fahrenheit for about 60 minutes and about 1300 degrees Fahrenheit for about 6 minutes to heat set the fibers whereby the frustum-shaped mat is seamless and self-supporting, requiring no shape retaining elements.
A pollution control device, comprising:
- (a) a housing having an inlet end cone assembly and an outlet end cone assembly;
- (b) each cone assembly comprising an inner cone housing and an outer cone housing;
- (c) a preformed insulation mat disposed between the inner and outer cone housing of each end cone assembly and comprising:
- (i) a molded frustum-shaped mat having a substantially centrally formed opening;
- (ii) the mat being binderless and comprising primarily heat moldable, silica based glass fibers containing Al2O3;
- and
- (iii) wherein the frustum-shaped mat of glass fibers is molded at a temperature of between about 400 degrees Fahrenheit for about 60 minutes and about 1300 degrees Fahrenheit for about 6 minutes to heat set the fibers whereby the frustum-shaped mat is seamless and self-supporting, requiring no shape retaining elements.
A method for forming a frustum-shaped insulation mat for use between the inner and outer end cone housing of a pollution control device, comprising:
- (a) forming an annular-shaped fibrous mat of primarily heat moldable, silica based glass fibers containing Al2O3, and no binders;
- (b) placing the fibrous mat into a substantially frustum-shaped mold, the mold comprising inner and outer housing sections, the mat disposed between the inner and outer housing sections;
- (c) subjecting the fibrous mat to a temperature of between about 400 degrees Fahrenheit for about 60 minutes and about 1300 degrees Fahrenheit for about 6 minutes to heat set the glass fibers, wherein the mat is permanently molded into a seamless, self-supporting and substantially frustum-shaped insulation, requiring no shape retaining elements.
Dependencies are inferred from the claim text.