Holding seal material, exhaust gas purifying apparatus and method of manufacturing holding seal material

摘要

A holding seal material includes inorganic fibers, skin layers provided around the inorganic fibers, inorganic particles included in the skin layers, a first main surface, and a second main surface. Thicknesses of the skin layers satisfy X>Y≧Z. X is a thickness of the skin layer of the inorganic fibers in a vicinity of the first main surface. Y is a thickness of the skin layer of the inorganic fibers in a vicinity of a center of the holding seal material in a thickness direction. Z is a thickness of the skin layer of the inorganic fibers in a vicinity of the second main surface.

主权项

1. A holding seal material comprising:
inorganic fibers; skin layers provided around the inorganic fibers; inorganic particles included in the skin layers; a first main surface; and a second main surface, wherein thicknesses of the skin layers satisfy a following relational expression (1),
X>Y≧Z  (1) wherein X is a thickness of the skin layer of the inorganic fibers in a vicinity of the first main surface, Y is a thickness of the skin layer of the inorganic fibers in a vicinity of a center of the holding seal material in a thickness direction, and Z is a thickness of the skin layer of the inorganic fibers in a vicinity of the second main surface.