Ngk Insulators, Inc.

Takeshi Tokunaga

Koichi Ito

Yukihito Ichikawa

Satoshi Taniguchi

Toshio Yamada

Hiroyuki Tsuji

Yasushi Noguchi

Yoshimasa Kondo

Shinya Yoshida

Chikashi Ihara

Takehiko Watanabe

Daniel Yukichi Kitaguchi

Toshio Oda

Takayuki Ogata

Yukari Nakane

Makoto Furutani

Kazuyuki Yamasawa

Koichi Miyashita

A regenerative burner including: a combustion chamber; a heat exchange chamber; and a communication passage therebetween, the combustion chamber includes a tip of a fuel nozzle and a flame ejection port, and is configured such that fuel introduced from the fuel nozzle into the combustion chamber can be burned in the combustion chamber using combustion air introduced into the combustion chamber through the communication passage to eject flame from the flame ejection port; the fuel nozzle is configured such that fuel burned in the regenerative burner is introduced into the combustion chamber; and the heat exchange chamber comprises a heat accumulator interposed between the communication passage and an air port, and is configured such that combustion air can pass through the heat accumulator and then be introduced into the combustion chamber such that an exhaust gas passes through the heat accumulator and is discharged from the air port.

Regenerative burner, industrial furnace and method for producing a fired article

A continuous heating furnace including an inlet, a heating zone, a cooling zone and an outlet in this order, for carrying out a heat treatment while conveying at least one workpiece from the inlet to the outlet, wherein the cooling zone is configured such that an ambient gas for direct cooling of the workpiece can flow into the cooling zone from the outlet; the cooling zone includes a plurality of indirect coolers arranged in parallel in the conveying direction of the workpiece, each of the indirect coolers having at least one regulator for independently adjusting a cooling power; and the cooling zone includes one or more residual heat outlets for discharging a residual heat gas in the cooling zone.

Continuous heating furnace and operating method thereof

The present disclosure is related to a method of producing a fired ceramic article. The method may include: heating a ceramic green body in a kiln, and controlling oxygen concentration in the kiln such that the oxygen concentration swings during the heating of the ceramic green body.

Method of producing fired ceramic article and method of firing ceramic green body

A setter for firing in a plate which is used for firing a honeycomb formed body and interposed between the honeycomb formed body and a shelf plate, wherein the setter for firing has a setter lower surface section facing the shelf plate, the setter lower surface section including: a central region part formed by a region including a lower surface center of the setter lower surface section; and a peripheral region part formed by a peripheral region of the central region part, and the peripheral region part has at least four or more setter groove parts each having a recessed cross sectional shape and extending radially from the lower surface center respectively in a direction from a boundary with the central region part toward a setter outer circumferential section.

Setter for firing, and method for producing honeycomb structure using setter for firing

A detecting apparatus includes: a lifting mechanism section that is provided with a lifting portion for lifting honeycomb structures and a shelf plate; an actual load value measuring section that measures an actual load value; a total load value calculating section that adds up the plurality of measured actual load value; a total load value determining section that compares a standard total weight value of the honeycomb structures and the shelf plate to the total load value and determines whether to satisfy a total load value determining condition; an actual load value determining section that compares the actual load value to the specified load value and determines whether to satisfy an actual load value determining condition; and a shelf-plate crack determining section that determines that the shelf plate is cracked when the total load value determining condition or the actual load value determining condition is not satisfied.

Shelf-plate crack detecting method, honeycomb structure delivering method, shelf-plate crack detecting apparatus, and shelf plate delivering apparatus

A process for producing a honeycomb structure includes: a mixing step where forming raw materials including a ceramic raw material are mixed to obtain a forming blended material, a kneading step where the forming blended material is kneaded to obtain kneaded clay, a forming step where the kneaded clay is formed into a honeycomb shape to obtain a honeycomb formed article, and a firing step where the honeycomb formed article is fired to obtain a honeycomb structure. The ceramic raw material is a cordierite forming raw material, and a magnetic powder contained in the kneaded clay is at a ratio of 400 ppm or less with respect to solid content conversion mass of the whole kneaded clay. There is provided a honeycomb structure capable of improving trapping efficiency, in particular, initial trapping efficiency by reducing the number of coarse pores in the partition walls.

Process for producing honeycomb structure

The apparatus for injecting slurry contains the first member having the cavity therein; and the second member having a plurality of convex sections, each of the convex sections having the injection hole formed therein communicating with the cavity, wherein the protrusion length of the convex section is in a range from 3 to 5 mm, and the distance between centers of adjacent convex sections is in a range from 3 to 13 mm.

Apparatus for injecting slurry and method therefor

A method for manufacturing a plugged honeycomb structure includes: a step of forming a columnar honeycomb formed body, and a plugging step of forming plugging portions in each of cells of the honeycomb formed body; wherein the plugging step has a plugging slurry injection operation where plugging slurry is injected into the cells by inserting the honeycomb formed body into a bottomed cylindrical inside container containing the plugging slurry and having a Young's modulus of 5 to 550 MPa and a tensile stress of 0.5 to 11 MPa and being disposed in a bottomed cylindrical outside container and by pressing one end portion against the bottom face of the inside container, and then the honeycomb formed body is pulled out from the inside container. There is provided a method for manufacturing a plugged honeycomb structure, the method being capable of inhibiting depression and protrusion of plugging portions.

Method for manufacturing plugged honeycomb structure

The film sticking apparatus includes: a gripping member; a pressing member pressing the adhesive face of the film being held in a planar state against one end face of a cylindrical honeycomb structure having a plurality of cells, and thus sticking the film to the one end face; and a folding member having an opening portion formed that allows an end of the honeycomb structure on the side to which the film is stuck to be inserted, wherein the folding member folds a protruding portion of the film protruding from the one end face of the honeycomb structure by inserting the honeycomb structure into the opening portion, toward a side face of the honeycomb structure, and simultaneously presses at least a part of the folded protruding portion against a part of the side face of the honeycomb structure to stick the film to the side face.

Film sticking apparatus and film sticking method

Plugged honeycomb structure

A method of manufacturing a plugged honeycomb structure has a plugging process which includes the steps of: immersing one end (a first end) of a honeycomb base material in a plugging slurry while vibrating the plugging slurry; after bringing an internal part of a cell into a negative pressure and then returning it into an atmospheric pressure, vibrating the plugging slurry to make the plugging slurry enter a first open end of the cell; and drying the plugging slurry having entered the first open end of the cell to form a first plugging portion at the first end.

Method of manufacturing plugged honeycomb structure

A manufacturing method of a plugged honeycomb structure including attaching a transparent sheet to an end face of a honeycomb structure; picking up an image of the end face; with respect to cells positioned at other than outermost peripheral portion of a honeycomb structure (usual cells), subjecting the picked-up image to image processing, recognizing positions to be plugged on said sheet, and with respect to cells positioned at outermost peripheral portion (outermost peripheral cells), positions of the cells are recognized based on an average cell pitch calculated from the positions of the cells, subjecting to a perforation treatment based on the recognized positions of the sheet, submerging an end portion into a plugging slurry in which a material of the plugging portions is slurried, filling holes made at the respective sheet with the slurry to form the plugging portions.

Manufacturing method of plugged honeycomb structure

There is provided a honeycomb structure including: porous partition walls separating and forming a plurality of cells extending between two end faces, and an outer peripheral wall formed unitarily with the partition walls. The cells include outermost peripheral portion partial cells each locating in an outermost peripheral portion of the honeycomb structure and having an incomplete cell cross section, a part of which is brought into contact with the outer peripheral wall, and complete cells each having a complete cell cross section other than the outermost peripheral portion partial cells. The complete cells and the outermost peripheral portion partial cells having plugging portions formed on one end portion so that an entire end face of the honeycomb structure shows a checkerwise plugging pattern, and the depth of the plugging portions in the outermost peripheral partial cells is smaller than that of the plugging portions in the complete cells.

There is disclosed a honeycomb structure in which while sufficiently maintaining a collection efficiency and a bonding strength of a plugging portion, a thermal shock resistance is improved. A plugging portionis formed in the end of each cellof a honeycomb structure, and a gaphaving a size of 20 &#x3bc;m or more is formed between the plugging portionand each partition wall. Moreover, the length of the gapin the axial direction is 50% or more and less than 95% of the length of the plugging portionin the axial direction, the length of the gap in a face vertical to the axial direction is 20% or more and 50% or less of the length of the inner peripheral surface of the cell, and the gaps are formed in at least &#x2153; of the plugging portions

Honeycomb structure and manufacturing method of the same

A manufacturing apparatus of a plugged honeycomb structure includes a table portion having a through hole into which the end of a honeycomb structure is inserted, positioning means for positioning and holding the honeycomb structure in the through hole of the table portion in such a manner that its end face appears on the side of a first face of the table portion, and a film holding portion fixing the remaining portion of a film on the side of a second face of the table portion. After or before fixing the film, holes corresponding to openings of cells of the honeycomb structure are formed in the film, and a plugging material is filled into the holes, to manufacture the plugged honeycomb structure using the apparatus.

Growing community of inventors

Nagoya, Japan

Takeshi Tokunaga