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US 2008/0157037 A1Published application
Dryer seal assembly
OwnerWarren Stidham, Michael Emory +2inventors
InventorsWarren Stidham, Michael Emory, John Burns, David Starrett
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Abstract
A dryer seal structure which incorporates a polyurethane foam interior. The foam incorporates a flame retardant additive of intumescent character to provide enhanced resistance to flammability.
Claims12
A dryer seal comprising an abrasion resistant felt covering layer and at least one underlying layer of substantially halogen free polyurethane foam including an intumescent flame retardant composition.
A method of forming a dryer seal comprising the steps of:
- (a) applying a layer of substantially halogen free polyurethane composition across a layer of fibrous felt wherein the polyurethane composition includes an intumescent flame retardant composition comprising a blowing agent, an acid donor and a carbon donor;
- (b) curing the polyurethane at elevated temperature while in contact with the fibrous felt to form a cured foam;
- (c) folding a strip of the felt with attached cured polyurethane to a desired cross sectional configuration;
- and
- (d) applying at least one seam at least partially along the length of the folded strip to hold the desired cross sectional configuration in place
2 more elements
Dependencies are inferred from the claim text.