Abstract: A honeycomb filter comprising a pillar-shaped honeycomb structure having a porous partition wall disposed so as to surround a plurality of cells which serve as a fluid through channel extending from an inflow end face to an outflow end face and a porous plugging portion provided at either an end on the inflow end face side or an end on the outflow end face side of the cell, wherein in a processed image obtained by binarizing an electron microscope image of a visual field area of 480 ?m×640 ?m of the plugging portion, the plugging portion is composed of a plurality of particles, and the number of the particles having an area of 0.25 ?m2 or more is 1000 or more and 3500 or less.

Abstract: A plugged honeycomb structure includes a honeycomb structure body having a porous partition wall disposed to surround a plurality of cells; and a plugging portion disposed at one end of the cells, wherein, in a section orthogonal to the extending direction of the cell, the cells each have a shape that is polygon, and one of the inflow cells and another are adjacent to each other with the partition wall therebetween, and in the section orthogonal to the extending direction of the cell, a total area of the inflow cell is larger than a total area of the outflow cell, a porosity of the partition wall is 38% or more, a thickness of the partition wall is 125 ?m or more and 280 ?m or less, a cell density of the honeycomb structure body is 31.0 cells/cm2 or more, and an air-permeability resistance of the partition wall is 4.5×107Pa·s/m2 or less.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb substrate and a plugging portion provided at an end portion on either an inflow or outflow end face side of cells, wherein, in a section orthogonal to the cell extending direction, the shapes of an inflow cell having the plugging portion and an outflow cell having the plugging portion are hexagonal. In the plurality of cells, a plurality of inflow cells surround one outflow cell such that one side of the inflow cell and one side of the outflow cell adjacent to the inflow cell are parallel. The partition wall includes a first partition wall and a second partition wall, at least one of the first partition walls is configured such that a ratio of a thickness of the second partition wall to the first partition wall is 1.0 to 2.5, and a total open frontal area is 35% to 95%.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb substrate and a plugging portion provided at an end portion on either an inflow or outflow end face side of cells, wherein, in a section orthogonal to the cell extending direction, the shapes of an inflow cell having the plugging portion and an outflow cell having the plugging portion are hexagonal. In the plurality of cells, a plurality of inflow cells surround one outflow cell such that one side of the inflow cell and one side of the outflow cell adjacent to the inflow cell are parallel. The partition wall includes a first partition wall and a second partition wall, at least one of the first partition walls is configured such that a ratio of a thickness of the second partition wall to the first partition wall is 1.0 to 2.5, and a total open frontal area is 35% to 95%.

Abstract: A honeycomb structure including: a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed, and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a total of heat capacities of the pair of electrode parts is from 2 to 150% of a heat capacity of the whole outer peripheral wall.

Abstract: A honeycomb structure including: a tubular honeycomb structure part having porous partition walls and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a distance from one end portion in the extending direction of the cells to an end portion of the electrode part which faces the one end portion of the honeycomb structure part in the extending direction of the cells is from 1 to 10% of a length of the honeycomb structure part in the extending direction of the cells.

Abstract: There is disclosed a honeycomb structure including a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed and an outer peripheral wall, and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 10 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and the electrode part has portions having a thickness of 0 to 70% of the maximum thickness of the electrode part.

Abstract: To provide a catalytic converter that reduces non-uniformity of temperature of a catalyst support and that can approach a uniform temperature distribution, and a structural body for supporting a catalyst that structures this catalytic converter. At a catalyst support, gradually decreasing width portions, at which a width thereof gradually decreases toward electrode centers, are formed at regions where electrodes, are contactingly disposed, as seen in a cross-section orthogonal to a direction in which exhaust flows. The width is shorter than a length of a center line at a given position. Heat generation and heat dissipation of the catalyst support are balanced overall.

Abstract: To provide a catalytic converter that reduces non-uniformity of temperature of a catalyst support and that can approach a uniform temperature distribution, and a structural body for supporting a catalyst that structures this catalytic converter. At a catalyst support, gradually decreasing width portions, at which a width thereof gradually decreases toward electrode centers, are formed at regions where electrodes, are contactingly disposed, as seen in a cross-section orthogonal to a direction in which exhaust flows. The width is shorter than a length of a center line at a given position. Heat generation and heat dissipation of the catalyst support are balanced overall.

Abstract: There is disclosed a honeycomb structure including: a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed, and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a total of heat capacities of the pair of electrode parts is from 2 to 150% of a heat capacity of the whole outer peripheral wall.

Abstract: There is disclosed a honeycomb structure including: a tubular honeycomb structure part having porous partition walls and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a distance from one end portion in the extending direction of the cells to an end portion of the electrode part which faces the one end portion of the honeycomb structure part in the extending direction of the cells is from 1 to 10% of a length of the honeycomb structure part in the extending direction of the cells.

Abstract: There is disclosed a honeycomb structure including a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed and an outer peripheral wall, and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 10 to 200 ?cm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and the electrode part has portions having a thickness of 0 to 70% of the maximum thickness of the electrode part.

Abstract: There is provided a honeycomb filter obtained by bonding, into one piece, a plurality of honeycomb segments comprising partition walls having filtering function, and a number of through-holes divided from each other by the partition walls and extending in an axial direction. Predetermined through-holes are plugged at one end face of the filter, and the remaining through-holes are plugged at the other end face of the filter. The honeycomb filter is characterized in that the honeycomb segment disposed in a peripheral portion of the honeycomb filter has a lower average bulk density than that of the honeycomb segment disposed in a central portion.

Abstract: There is provided a honeycomb structure in which the structure is not segmented, or a smaller number of segments are integrated to suppress a local temperature rise and to reduce breakage by thermal stress at the time of use, and a method of manufacturing the structure. There is disclosed a honeycomb structure 1 comprising: a large number of cells 3 partitioned by cell walls 2 and extending through an axial direction. A flow channel separator 6 is formed in the honeycomb structure 1. There is disclosed a method of manufacturing the honeycomb structure 1 in which the flow channel separator 6 is formed by extrusion. There is disclosed a method of manufacturing the honeycomb structure 1 in which the flow channel separator 6 is formed by clogging.

Abstract: There are disclosed an exhaust emission control system including an internal combustion engine, a filter, and an exhaust pipe, a method of manufacturing a filter suitable for the system, and a method of calculating a pressure loss. The system comprises combustion means for intermittently burning particulate matters arrested by the filter, the filter includes porous partition walls extending from one end face to the other end face thereof, and a large number of through channels partitioned by the partition walls, predetermined through channels are sealed at either of the end faces, and assuming that a partition wall thickness is (X) ?m, and the number of through channels per unit area in a cross section vertical to a longitudinal direction of the through channels is (Y) cells/cm2, X and Y come within a range surrounded by straight lines connecting points A1, B1, C1, and D1 in this order in FIG. 1 in the exhaust emission control system.

Abstract: A honeycomb structure includes a plurality of honeycomb segments each having a number of throughholes divided from each other by partition walls and extending in the axial direction of honeycomb segment, wherein the honeycomb segments are bonded at their surfaces parallel to the axial direction to form an integrated body, such that the honeycomb segments comprise those honeycomb segments in which the outer portion 6 has a larger per-unit-volume heat capacity than the central portion does.

Abstract: There are disclosed an exhaust emission control system including an internal combustion engine, a filter, and an exhaust pipe, a method of manufacturing a filter suitable for the system, and a method of calculating a pressure loss. The system comprises combustion means for intermittently burning particulate matters arrested by the filter, the filter includes porous partition walls extending from one end face to the other end face thereof, and a large number of through channels partitioned by the partition walls, predetermined through channels are sealed at either of the end faces, and assuming that a partition wall thickness is (X) ?m, and the number of through channels per unit area in a cross section vertical to a longitudinal direction of the through channels is (Y) cells/cm2, X and Y come within a range surrounded by straight lines connecting points A1, B1, C1, and D1 in this order in FIG. 1 in the exhaust emission control system.

Abstract: There is provided a honeycomb filter obtained by bonding, into one piece, a plurality of honeycomb segments comprising partition walls having filtering function, and a number of through-holes divided from each other by the partition walls and extending in an axial direction. Predetermined through-holes are plugged at one end face of the filter, and the remaining through-holes are plugged at the other end face of the filter. The honeycomb filter is characterized in that the honeycomb segment disposed in a peripheral portion of the honeycomb filter has a lower average bulk density than that of the honeycomb segment disposed in a central portion.

Abstract: There is provided a honeycomb structure in which the structure is not segmented, or a smaller number of segments are integrated to suppress a local temperature rise and to reduce breakage by thermal stress at the time of use, and a method of manufacturing the structure. There is disclosed a honeycomb structure 1 comprising: a large number of cells 3 partitioned by cell walls 2 and extending through an axial direction. A flow channel separator 6 is formed in the honeycomb structure 1. There is disclosed a method of manufacturing the honeycomb structure 1 in which the flow channel separator 6 is formed by extrusion. There is disclosed a method of manufacturing the honeycomb structure 1 in which the flow channel separator 6 is formed by clogging.

Abstract: There is provided a honeycomb structure which hardly generates cracks caused by the thermal stress appearing therein during the use and which is superior in durability.