A honeycomb structure comprising an outer peripheral wall; a partition wall defining a plurality of cells each extending from one end face to other end face, a plurality of slits extending radially inward from an outer peripheral surface of the honeycomb structure and extending in an extending direction of the cells; and a filling material filled in the slits. A difference between a width Y of the filling material when viewed from the outside in the radial direction of the honeycomb structure, and a width X of each of the slits on the outer peripheral surface of the honeycomb structure, represented by (Y?X), is determined for each of the slits, and a difference between a maximum value A of the difference and a minimum value B of the difference, represented by the (A?B), is 0.4 mm or less.

The present invention includes recognizing, as positions of outermost circumferential cells, positions each of which is calculated from an average cell pitch of usual cells and each of which is present on an inner side from a circumference of an end face of a honeycomb structure; disposing, on the basis of the recognition, virtual perforation regions at positions on a sheet which correspond to the outermost circumferential cells to be plugged, each of the virtual perforation regions being divided into a plurality of squares; and performing perforation processing of perforating at least one of a plurality of squares in each of the virtual perforation regions. Positions and a number of squares to be perforated in each of the virtual perforation regions are individually set in accordance with each of the positions of the outermost circumferential cells to be plugged to which each of the virtual perforation regions corresponds.

A method of plugging a permeable porous cellular body (14) comprises: contacting the permeable porous cellular body (14) with a plugging mixture (100), the permeable porous cellular body (14) defining a plurality of channels (26); forcing the plugging mixture (100) into the plurality of channels (26) until a maximum, self-limiting, depth (114) of plugging mixture (100) is disposed within the plurality of channels (26); and maintaining a constant flow rate of the plugging mixture (100) into the plurality of channels until (26) a pressure on the plugging mixture (100) elevates to a predetermined pressure. Alternatively, the method comprises forcing the plugging mixture (100) into the plurality of channels (26) utilizing the application of a constant pressure over time until a maximum, self-limiting, depth (114) of the plugging mixture (100) is disposed within the plurality of channels (26); and maintaining the constant pressure applied to the plugging mixture (100) until flow of the plugging mixture (100) into the channels (26) decays from an initial flow rate to a predetermined flow rate.

A gaseous emissions treatment component is made by extruding a green ceramic mix through a die to form an extrusion having a honeycomb substrate with elongate cells extending its length and with the cells bounded by walls dividing adjacent cells from one another. Molten metal for use in induction heating of the component is placed in selected cells and is solidified by cooling.

A sealed honeycomb structure may include porous walls dividedly forming inlet cells and outlet cells extending from an end surface of an inlet side to an end surface of an outlet side, inlet and outlet side sealing portion 5b, and an inlet side sealing portion, wherein at least one outlet cell is a reinforced cell where a reinforcing part 6 for reinforcing the outlet cell 2b is formed at at least one corner portion 21a at which the walls on a cross-section vertical to an extending direction of the cell cross each other, wherein the inlet cell is a non-reinforced cell where the reinforcing part is not formed at all the corner portions at which the walls on the cross-section vertical to the extending direction of the cell cross each other, and wherein the reinforcing parts 6 of the reinforced cells 22 are formed at a section of the honeycomb structure from the end surface of the outlet side in the extending direction of the cell.

A manufacturing method of a plugged honeycomb structure including a plugging material preparing step of mixing a ceramic raw material, a pore former, a thickener, an organic binder, a dispersing agent, and water and preparing the plugging material which is slurried, to form the plugging portions, wherein the plugging material preparing step includes: a powder mixing step of mixing the ceramic raw material, the pore former, the organic binder and the dispersing agent each of which is constituted of powder, at predetermined blend ratios, a thickener mixing step of adding and mixing the thickener to a powder mixture obtained by the powder mixing step, and a kneading step of adding the water to a thickener added mixture obtained by the thickener mixing step, to perform kneading.

A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of t from the other end meeting the relation of A1/A22, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.

A method of plugging a filter, comprising: positioning a mask layer over the filter comprising a plurality of intersecting walls, wherein the intersecting walls define at least one channel between the intersecting walls; perforating the mask layer proximate the channel to form a hole, wherein the hole extends around a portion of a perimeter of the channel such that the mask layer defines a flap extending over a center of the channel; passing a plugging mixture into the channel through the hole in the mask layer; and sintering the plugging mixture to form a plug within the channel.

A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of t from the other end meeting the relation of A1/A22, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.

A method of plugging a permeable porous cellular body comprises: contacting the permeable porous cellular body with a plugging mixture, the permeable porous cellular body defining a plurality of channels; forcing the plugging mixture into the plurality of channels until a maximum, self-limiting, depth of plugging mixture is disposed within the plurality of channels; and maintaining a constant flow rate of the plugging mixture into the plurality of channels until a pressure on the plugging mixture elevates to a predetermined pressure. Alternatively, the method comprises forcing the plugging mixture into the plurality of channels utilizing the application of a constant pressure over time until a maximum, self-limiting, depth of the plugging mixture is disposed within the plurality of channels; and maintaining the constant pressure applied to the plugging mixture until flow of the plugging mixture into the channels decays from an initial flow rate to a predetermined flow rate.