Honeycomb structured body and exhaust gas converting apparatus

Abstract

A honeycomb structured body comprising: a pillar-shaped honeycomb block including a honeycomb unit in which a number of cells are longitudinally placed in parallel with a cell wall therebetween; and a sealing material provided on a peripheral portion of said pillar-shaped honeycomb block, wherein irregularities are formed on each peripheral face of said honeycomb structured body and said pillar-shaped honeycomb block, and said honeycomb unit comprises inorganic particles, as well as inorganic fibers and/or whiskers, when a least square curve is obtained by a least square method on the basis of points comprising the contour of a cross-section perpendicular to the longitudinal direction of said honeycomb structured body, a center-of-gravity of the least square curve is defined as c1, a distance between a minimum concentric circumscribed curve having c1 as the center-of-gravity, derived from said least square curve and the center-of-gravity c1 is defined as D1, a distance between a maximum concentric inscribed curve having c1 as the center-of-gravity, derived from said least square curve and the center-of-gravity c1 is defined as D2, and (D1−D2) is defined as M1, the following inequality is satisfied: about 0.3 mm≦M1; and when a least square curve is obtained by a least square method on the basis of points comprising the contour of a cross-section perpendicular to the longitudinal direction of said honeycomb block, a center-of-gravity of the least square curve is defined as c2, a distance between a minimum concentric circumscribed curve having c2 as the center-of-gravity, derived from said least square curve and the center-of-gravity c2 is defined as D3, a distance between a maximum concentric inscribed curve having c2 as the center-of-gravity, derived from said least square curve and the center-of-gravity c2 is defined as D4, and (D3−D4) is defined as M2, the following inequality is satisfied: about 0.5 mm≦M2≦about 7.0 mm.

Dependencies are inferred from the claim text.