Patent ID: 8038758
Filing Date: 2011-10-18
Classification: B32B,C04B,D04H,F01N,Y10S,Y10T

Abstract:
1. A mat material comprising: a mat base comprising an inorganic fiber and having a first surface and a second surface opposite to the first surface; a first sheet material provided on the first surface of the mat base to alleviate scattering of the inorganic fiber contained in the inorganic fiber mat base; a second sheet material provided on a second surface of the mat base to alleviate scattering of the inorganic fiber contained in the inorganic fiber mat base; the first and second sheet materials having elongation anisotropy in planes of the first and second surfaces, respectively; and a relationship θ wherein a direction in which a value at about a 5% nominal strain represented by (a tensile load (N)/a nominal strain) in the planes of the sheet materials becomes minimum is defined as the easy-to-elongate direction and a direction in which the value becomes maximum is defined as a hard-to-elongate direction, and wherein an angle formed by the easy-to-elongate direction and the hard-to-elongate direction in the first sheet material is θ