Disclosed is an air filter and a method of manufacture for an air filter which is much more cost effective and provides greater operational effectiveness than state-of-the-art air filters. The air filter includes an outer metallic shell which may be used to attach the filter in line to ducting of a heating, ventilation, and air conditioning (HVAC) system. The filter may further include a filter unit made of activated carbon material. The filter unit may have one or more sections and may have a honeycomb cross section.

A plugged honeycomb structure includes: a honeycomb substrate and a plugging portion, and is configured to trap particulate matter included in fluid flowing from an inflow side end face to an outflow side end face. The partition wall includes, as raw materials, particulates of a base material and a binder and having a melting point lower than that of the base material, the base material has a particle diameter in a range of 5 m to 60 m, a mass ratio of the binder to a total mass of the raw material of the base material and the binder is in a range of 22 mass % to 45 mass %, and the cells include round cells as a part, the round cells being defined by a circular-arc partition wall having a circular-arc shape that is at least a part of the partition wall to have a circular shape or the like.

The invention relates to a dust collector for gaseous fluids and to a method for manufacturing the dust collector. The dust collector, used for removing dust from gaseous fluids containing fine dust, is equipped with a periodic cleaning system and comprises one or more filtering assemblies (1) that have filtering elements (2). The filtering elements (2) have a tubular extension and are closed at one end. They are made of a rigid or semirigid filtering material and are kept in contact with each other along a direction parallel to their length; the filtering elements (2) enclose, between them, flow channels (3) open at one end and closed at the end opposite the end at which the filtering elements (2) are closed. The method for manufacturing a filtering assembly (1) of the dust collector comprises the steps of: permanently deforming a sheet of a filtering material so as to obtain a corrugated sheet (8) with a cross-section defined by repetitions of -shaped forms that are connected to each other; coupling two deformed sheets, so as to keep the straight parts of the reshaped forms in contact and to obtain rows of filtering elements (2); connecting the various rows of filtering elements to each other, by placing them in contact along generatrices of the elements facing each other; closing the ends of the filtering elements (2) and of flow channels (3) that are formed between the filtering elements.

A honeycomb formed body containing a ceramics raw material, he honeycomb formed body including: a pillar shaped honeycomb structure portion having a plurality of rectangular cells, the cells being defined by partition walls and extending from a first end face to a second end face to form flow paths; an outer peripheral portion having outer peripheral portions X where the partition walls are covered with an outer peripheral wall; and outer peripheral portions Y where the partition walls are exposed. Each of the outer peripheral portions X includes a tapered portion having a gradually deceasing thickness of the outer peripheral wall toward a boundary portion with an adjacent outer peripheral portion Y. The tapered portion requires a length equal to or more than one time of an average cell pitch in the outer peripheral direction until thickness of the outer peripheral wall is halved.

A method of making a ceramic honeycomb article which includes: applying at least one green membrane coating layer on a green substrate, the green substrate comprising a plurality of cells comprised of a plurality of interior channels and a plurality of porous interior walls between the channels; drying the at least one green membrane coating layer on the green substrate to produce a green coated substrate; and firing the green coated substrate into a porous substrate, wherein applying the at least one green membrane coating layer and the drying the at least one green membrane coating layer are repeated from 2 to 10 times prior to firing to form multiple green membrane coating layers on the green substrate and wherein the firing the green coated substrate forms a ceramic honeycomb article comprised of the porous substrate and multiple fired coating layers on the porous substrate.

A honeycomb structure prevents catalyst slurry from leaching out when applying a wash coat for making a catalyst supported, ensuring air permeability of the outer portion and in which there is no occurrence of cracking when used as a gasoline particulate filter. The honeycomb structure having: a honeycomb substrate composed of porous partition walls forming a plurality of cells and a porous outer portion; and a resin composition on the outer portion of the honeycomb substrate, wherein the outer portion and the partition walls of the honeycomb substrate are formed of the same material; a porosity of the honeycomb structure is 50% or more; and the resin composition is impregnated into pores of the whole outer portion; and the impregnation depth is equal to the outer portion thickness or a part of the resin composition is impregnated deeper than the outer portion and reaches the cell partition walls.

A structural body 10 includes a porous partition portion 14 forming a plurality of cells 12 each of which is used as a flow path of a mixed gas as a fluid; a function layer 16 provided on each inside surface 15 of the partition portion 14; a protective layer 18 provided on each inside surface end portion 15a of the inside surface 15; and a sealing portion 19 provided on each end surface 17 of the partition portion 14. The function layer 16 contains metal ions, and is transformed by light. The protective layer 18 is a length B (mm) from an end surface 11 of the structural body 10 and a maximum length A (mm) of an opening of the cell 12 satisfy the relationship of B/A0.4.

A honeycomb structure includes a pillar-shaped honeycomb structure body including porous partition walls defining and forming a plurality of cells which extend from an inflow end face to an outflow end face, and a porous outer wall surrounding the partition walls, a porous supporting bulge disposed to extend out from a circumference of the outer wall so that at least a part of the outer wall is exposed, and plugging portions arranged in open ends of the cells, and the supporting bulge has support portions and a side wall portion, and the partition walls and the outer wall of the honeycomb structure body and the support portions and the side wall portion of the supporting bulge are all formed monolithically by formation of a ceramic raw material.

A honeycomb filter includes a plurality of cells and porous cell walls. Exhaust gas is to flow through the plurality of cells. The plurality of cells include exhaust gas introduction cells and exhaust gas emission cells. The honeycomb filter has a round cross sectional shape. Each of the exhaust gas emission cells is adjacently surrounded fully by the exhaust gas introduction cells. In the cross section, the exhaust gas introduction cells and the exhaust gas emission cells each have a polygonal shape. In the cross section, a side forming a cross sectional shape of each of the first exhaust gas introduction cells faces one of the exhaust gas emission cells, a side forming a cross sectional shape of each of the second exhaust gas introduction cells faces one of the exhaust gas emission cells.

An air filter, including: at least one wall-flow honeycomb particulate filter having at least one coat on at least a portion of the interior surface of the filter, wherein the at least one coat comprises at least one of: a sorbent; a catalyst; or a combination thereof, and the air filter, in-use, retains from filtered air at least one of: a particulate, a volatile organic compound, or a combination thereof. Also disclosed is an interior air purification system including the air filter, and methods of making and using the air filter.