Abstract: Provided is a mold part which does not generate periodic irregularities (scale pattern) which appear in the direction orthogonal to the drawing direction (MD) of the mold part having a surface which slides parallel to a molded article when the molded article is removed from the mold after injection molding during injection molding of a thermoplastic resin (in particular, a thermoplastic fluoropolymer), an injection molding method using the same, and a molded article in which periodic irregularities (scale pattern) (which appear in the direction orthogonal to the drawing direction (MD) of the mold part) do not appear. The mold part is used for injection molding of a thermoplastic resin, and includes a surface which slides substantially parallel to a molded article when the molded article is removed from the mold after injection molding, wherein the average tilt angle in the sliding direction (MD) is 1.5° or higher.

Abstract: A method of manufacturing a tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass, includes steps of: forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and firing the coating film to obtain the insulating layer. The spraying is performed while the tubular main body is rotated with a length direction thereof being a rotation axis.

Abstract: A method of manufacturing a tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass, includes steps of: forming a coating film by bringing a coating liquid for insulating layer formation supplied to the tubular main body into contact with a contact member; and firing the coating film to obtain the insulating layer.

Abstract: A method of manufacturing a tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention, the tubular member including a tubular main body made of a metal and an insulating layer formed on at least an inner peripheral surface of the tubular main body, the insulating layer containing glass, includes steps of: forming a coating film by spraying a coating liquid for insulating layer formation onto the inner peripheral surface of the tubular main body; and firing the coating film to obtain the insulating layer. The spraying is performed while the tubular main body is rotated with a length direction thereof being a rotation axis.

Abstract: To provide a technique related to a marking base that allows clear marking by ink and is excellent in thermal resistance and chemical resistance. A marking base composition contains inorganic particles of 27 to 50 mass %, an inorganic binder of 5 to 20 mass %, an organic binder of 3 to 16 mass %, a thermal expansion resin of 1 to 3 mass %, and an organic solvent.

Abstract: There is disclosed a grinding method of a honeycomb structure, wherein a grind processing member having an outer peripheral surface, a first grinding wheel tapered surface and a second grinding wheel tapered surface and rotating around a central axis grinds a joined honeycomb segment assembly rotating around a central axis, and the above respective surfaces of the grind processing member form a first ground region, a second ground region, a center ground surface, a first tapered surface and a second tapered surface, to prepare the honeycomb structure including a cylindrical honeycomb base material, and a ring-like bulge portion “which surrounds an outer periphery of the honeycomb base material, protrudes from the outer periphery of the honeycomb base material toward the outside in a flange manner, and has the first tapered surface, the second tapered surface and the center ground surface.

Abstract: A honeycomb filter 100 includes honeycomb segments 4, plugging portions 5, and joining layers 7, area of outflow end surface 12 of honeycomb segment is larger than area of inflow end surface 11, and shape of cross section of honeycomb segment vertical to axial direction X has a similarity in axial direction X. Moreover, thickness of joining layer decreases in at least a part of joining layer in direction from inflow end surface side toward outflow end surface side, and length L2 of joining layer in axial direction X is smaller than 95% of length L1 of honeycomb segment in axial direction X. Furthermore, a region of honeycomb segments 4, 5 mm or more from outflow end surface 12 in axial direction X, is not provided with joining layers 7 which join side surfaces of honeycomb segments 4 to each other.

Abstract: To provide a technique related to a marking base that allows clear marking by ink and is excellent in thermal resistance and chemical resistance. A marking base composition contains inorganic particles of 27 to 50 mass %, an inorganic binder of 5 to 20 mass %, an organic binder of 3 to 16 mass %, a thermal expansion resin of 1 to 3 mass %, and an organic solvent.

Abstract: A honeycomb filter 100 includes honeycomb segments 4, plugging portions 5, and joining layers 7, area of outflow end surface 12 of honeycomb segment is larger than area of inflow end surface 11, and shape of cross section of honeycomb segment vertical to axial direction X has a similarity in axial direction X. Moreover, thickness of joining layer decreases in at least a part of joining layer in direction from inflow end surface side toward outflow end surface side, and length L2 of joining layer in axial direction X is smaller than 95% of length L1 of honeycomb segment in axial direction X. Furthermore, a region of honeycomb segments 4, 5 mm or more from outflow end surface 12 in axial direction X, is not provided with joining layers 7 which join side surfaces of honeycomb segments 4 to each other.

Abstract: There is disclosed a grinding method of a honeycomb structure, wherein a grind processing member having an outer peripheral surface, a first grinding wheel tapered surface and a second grinding wheel tapered surface and rotating around a central axis grinds a joined honeycomb segment assembly rotating around a central axis, and the above respective surfaces of the grind processing member form a first ground region, a second ground region, a center ground surface, a first tapered surface and a second tapered surface, to prepare the honeycomb structure including a cylindrical honeycomb base material, and a ring-like bulge portion “which surrounds an outer periphery of the honeycomb base material, protrudes from the outer periphery of the honeycomb base material toward the outside in a flange manner, and has the first tapered surface, the second tapered surface and the center ground surface.

Abstract: There is disclosed a method for preparing a honeycomb segment joined body in which a plurality of honeycomb segments are arranged in directions parallel to a first flat surface and a second flat surface of an installation reference jig to install the honeycomb segments in predetermined positions via a paste-like joining material on the installation reference jig by use of the installation reference jig having the first flat surface and the second flat surface forming a right angle therebetween, and then the joining material is dried and cured to join the plurality of honeycomb segments together. In the preparation method, in at least a part of a process of successively installing the plurality of honeycomb segments in the predetermined positions, when a new honeycomb segment is installed, at least a part of the installed honeycomb segments is pressurized and held in the predetermined positions so that the already installed honeycomb segments are not displaced.

Abstract: There is disclosed a method for preparing a honeycomb segment joined body in which a plurality of honeycomb segments are arranged in directions parallel to a first flat surface and a second flat surface of an installation reference jig to install the honeycomb segments in predetermined positions via a paste-like joining material on the installation reference jig by use of the installation reference jig having the first flat surface and the second flat surface forming a right angle therebetween, and then the joining material is dried and cured to join the plurality of honeycomb segments together. In the preparation method, in at least a part of a process of successively installing the plurality of honeycomb segments in the predetermined positions, when a new honeycomb segment is installed, at least a part of the installed honeycomb segments is pressurized and held in the predetermined positions so that the already installed honeycomb segments are not displaced.

Abstract: A method of manufacturing a honeycomb structure of the present invention is a method of obtaining a honeycomb structure 10 having a predetermined shape by processing a peripheral portion of a crude honeycomb structure 2, the method being characterized in that the peripheral portion of the crude honeycomb structure 2 is processed by a cutter having linear cut-off device. It is possible to effectively manufacture a honeycomb structure suitably used in a carrier for a catalyst having a catalytic action, for use in internal combustion engine, boiler, chemical reactor, reformer for fuel cell, etc., or as a filter for trapping particulate matter present in an exhaust gas by the method at low cost.

Abstract: A method of manufacturing a honeycomb structure of the present invention is a method of obtaining a honeycomb structure 10 having a predetermined shape by processing a peripheral portion of a crude honeycomb structure 2, the method being characterized in that the peripheral portion of the crude honeycomb structure 2 is processed by a cutter having linear cut-off device. It is possible to effectively manufacture a honeycomb structure suitably used in a carrier for a catalyst having a catalytic action, for use in internal combustion engine, boiler, chemical reactor, reformer for fuel cell, etc., or as a filter for trapping particulate matter present in an exhaust gas by the method at low cost.

Abstract: A gas feed ceramic structure for feeding a gas into a semiconductor-producing apparatus, includes a planar substrate having a gas-feeding surface and a rear surface. The planar substrate has depressions formed from the rear surface toward the gas-feeding surface to define thin portions between the depressions and the gas-feed surface. Each of the thin portions includes a plurality of gas feed holes for feeding the gas to a side of the gas-feeding surface of the substrate, and one open end of the gas feed holes is provided at the gas-feeding surface of the substrate, and the other open end faces the depressions.

Abstract: A process for machining edge portions of a ceramic article preform without chipping includes grinding in such consecutive machining steps and machining directions that a chipped portion which results in a machined part of the edge portion in a machining step, is removed by any succeeding. Further, a lastly remaining part of the edge portions of the ceramic article preform is machined in a final step without chipping, thereby enabling the edge portion of the ceramic article preform to be ground without chipping.

Abstract: A process for chucking and machining an elongated cylindrical article made of a ceramic material according to the present invention, comprises the steps of: (1) chucking the elongated cylindrical ceramic article between chuck heads at longitudinally opposite end portions of said ceramic article; (2) holding the elongated cylindrical article between the chuck heads under such a low chucking pressure as allowing the ceramic article to slip inside a driven side chuck head while being kept inside the chuck heads at the opposite end portions, and slipping the ceramic article inside the chuck heads for a given time under rotation of a driving chuck head so that any positional deviation between the location of a center axis passing centers of of the chuck heads and an axis of the ceramic article may be removed due to a self aligning centrifugal action of the ceramic article; (3) raising the chucking pressure of the chuck heads to such a level as required for machining the ceramic article; and (4) then machining a su