Patent ID: 7229938

Claim:
A heat and flame unitary planar shield material comprising: a plurality of heat and flame resistant fibers and a plurality of bulking fibers, the unitary planar shield material including a heat and flame resistant zone extending from a heat and flame resistant outer boundary to a heat and flame resistant inner boundary, and a bulking zone extending from a bulking zone outer boundary to a bulking zone inner boundary adjacent to the heat and flame resistant inner boundary, a binder fiber, wherein the heat and flame resistant zone contains a portion of both the bulking fibers the heat and flame resistant fibers with a higher portion of heat and flame resistant fibers than bulking fibers, wherein the concentration of heat and flame resistant fibers is greater near the heat and flame resistant outer boundary than at the heat and flame resistant inner boundary, and wherein the bulking zone contains a portion of both bulking fibers and the heat and flame resistant fibers with a higher portion of voluminous bulking fibers, wherein the concentration of bulking fibers is greater near the bulking zone outer boundary than at the bulking zone inner boundary.