摘要:
An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks. The columnar honeycomb structural body of the present invention includes a plurality of through holes placed in parallel with one another in the length direction, and wall portion that separates the plurality of through holes from one another and constitutes a circumferential face, wherein the plurality of through holes are composed of a group of large-capacity through holes, with one end thereof being sealed so as to cause the total of areas of cross-section perpendicular to the length direction to become relatively greater, and a group of small-capacity through holes, with the other end thereof being sealed so as to cause the total of areas of the above-mentioned cross-section to become relatively smaller, and the above-mentioned circumferential face of the columnar honeycomb structural body has a chamfered corner portion.
摘要:
A honeycomb filter includes at least one pillar-shape honeycomb structured body including a plurality of cells partitioned by partitions, and plugs for sealing upstream openings of a plurality of first cells selected from the plurality of cells and for sealing downstream openings of a plurality of second cells selected from the plurality of cells. Each of the plugs is formed of a material having a greater total content of aluminum, iron, boron, silicon, and free carbon than a material forming the honeycomb structured body.
摘要:
A honeycomb filter of the present invention is a honeycomb filter 10 including a number of through-holes 12 surrounded by partition walls and extending through an axial direction, in which the partition walls have filterability, predetermined through-holes 12 are plugged at one end portion, and the remaining through-holes 12 are plugged at the other end portion to trap particulate matter contained in a dust-containing fluid. The honeycomb filter is characterized in that a heat capacity of a central part 11 is set to be larger than that of a peripheral part 13 in a section of the honeycomb filter 10 perpendicular to the axial direction. There is provided a honeycomb filter in which a crack is not generated by thermal stress during use, especially at a regeneration time and which is superior in durability.
摘要:
A filter block, particularly for filtering particulates present in the exhaust gases of an internal combustion engine, including peripheral inlet (50,14p2) and outlet (52,14p1) channels arranged alternately at the periphery of the block and each including an external wall (44;54 ;401,402;403) exposed to the exterior of the block and an internal wall (46 ;56 ;404,405 ;406,407,408) arranged inside the block. The block according to the invention is remarkable in that it includes at least one group (G) of two adjacent peripheral channels (50,52) such that, in a transverse plane of section (P), the ratio R of the average thickness “E” of all the external walls (44,54) of the group (G) to the average thickness “e” of all the internal walls (46,56) of the (G) is greater than 1.2.
摘要:
A method of blocking partial cells at the periphery of diesel filters is disclosed. The method comprises plugging the partial cells with a suitable plugging material. In one embodiment, a line of plugging material is applied to either or both of the end faces of the diesel filter along an outermost row of partial cells to block same. In another embodiment, the outermost wall the diesel filter is first beveled to form a beveled edge and uniquely off-set the partial cells. Then the beveled edge has applied thereto a plugging material, such as a line or bead. A honeycomb structure having reduced number of unplugged partial cells at the periphery is also disclosed.
摘要:
A honeycomb structure 10 includes: multiple honeycomb units 11 having multiple through holes 12; and a seal layer 14 that joins adjacent honeycomb units 11 with each other via respective closed outer faces 13 of the honeycomb units 11 that are different from respective honeycombed faces of the honeycomb units 11. The honeycomb unit 11 includes at least inorganic particles, inorganic fibers and/or whiskers. A cross section area of a honeycombed face of the honeycomb unit perpendicular to the through holes 12 is about 5 to about 50 cm2, and the surface roughness Rz of the outer face 13 is about 5 to about 50 μm.
摘要:
A honeycomb structured body of the present invention is a honeycomb structured body in which plural pillar-shaped honeycomb units are bonded to one another through sealing material layers, each unit having in the longitudinal direction a large number of cells placed in parallel with a cell wall therebetween. Herein, a cross-sectional area of the honeycomb unit on a cross-section perpendicular to the length direction is at least about 5 cm2 and at most about 50 cm2, the honeycomb unit includes inorganic fibers and/or whiskers in addition to inorganic particles, and a Young's modulus of the honeycomb unit is at least about 50% and at most about 150% of a Young's modulus of the sealing material layer.
摘要:
There is disclosed a honeycomb structure which is useful as a trapping filter for an exhaust gas, above all a diesel particulate filter (DPF) for trapping particulate matters (particulates) in an exhaust gas from a diesel engine and in which internal and external temperature rises are uniformed during use and during regeneration and in which there are effectively prevented generation of defects such as cracks due to a thermal stress and generation of an adverse influence on a carried catalyst. A honeycomb structure 1 includes: a bonded honeycomb segment article 10 in which bond surfaces of a plurality of honeycomb segments 2 are integrally bonded to one another via bonding material layers 9; and an outer peripheral coating layer 4 which coats an outer peripheral surface of the bonded honeycomb segment article 10. The honeycomb structure has a structure in which a plurality of cells 5 forming fluid channels are arranged in parallel with one another in a central axis direction. The honeycomb segments 2 are bonded via the bonding material layers (partial bonding material layers) 9 disposed only in predetermined portions of the honeycomb segments 2.
摘要:
A method for manufacturing a honeycomb formed body, which comprises: a mixing step of mixing two or more types of aggregate particulate materials (first mixing) to prepare a forming blend (dry powder) and then mixing the blend with water (second mixing) to prepare a forming blend (wet powder); and a kneading step of kneading the forming blend (wet powder) to prepare a clay. This method for manufacturing a honeycomb formed body allows the prevention of the generation of internal defects without the adoption of a complicated process or a troublesome operation, with ease and simplicity.
摘要:
A method for manufacturing a plugged honeycomb structure includes the steps of: applying a predetermined amount of the plugging slurry on a face of an end face sealing member, one end face of the masked honeycomb structure is pressed against the face to which the plugging slurry was applied of the end face sealing member to fill the plugging slurry in the predetermined cells on the one end face side, and drying at least the plugging slurry at a portion in contact with the face of the end face sealing member in a state that the face of the end face sealing member is pressed against the one end face of the masked honeycomb structure. The method can manufacture simply at a low cost a plugged honeycomb structure with reduced accumulation of deposit on an end face when the honeycomb structure is used as a filter or the like.