Abstract: A method and an apparatus capable of extrusion molding a comparatively wide, thin ceramic sheet using a screw extruder while suppressing the wrinkling thereof. The molding apparatus includes a screw-type extruder and a mold at the forward end of the extruder is used to extrusion mold a ceramic sheet from the ceramic material introduced into the extruder by way of the mold. The extrusion molding is carried out while regulating the temperature of the portion of the ceramic material passing through the mold corresponding to each of a plurality of areas (control zones) into which the mold is divided.

Abstract: A method and an apparatus capable of extrusion molding a comparatively wide, thin ceramic sheet using a screw extruder while suppressing the wrinkling thereof. The molding apparatus includes a screw-type extruder and a mold at the forward end of the extruder is used to extrusion mold a ceramic sheet from the ceramic material introduced into the extruder by way of the mold. The extrusion molding is carried out while regulating the temperature of the portion of the ceramic material passing through the mold corresponding to each of a plurality of areas (control zones) into which the mold is divided.

Abstract: A method and an apparatus capable of extrusion molding a comparatively wide, thin ceramic sheet using a screw extruder while suppressing the wrinkling thereof. The molding apparatus includes a screw-type extruder and a mold at the forward end of the extruder is used to extrusion mold a ceramic sheet from the ceramic material introduced into the extruder by way of the mold. The extrusion molding is carried out while regulating the temperature of the portion of the ceramic material passing through the mold corresponding to each of a plurality of areas (control zones) into which the mold is divided.

Abstract: An extrusion molding apparatus for a ceramic molded product which is capable of passing a ceramic material smoothly through a filter unit is disclosed. The extrusion molding apparatus comprises a mold (11) for molding a ceramic molded product, a screw extruder (4) for supplying a ceramic material (80) to the mold (11), and a filter unit (3) for filtering the ceramic material (80) at the extrusion outlet (41) of the screw extruder (4). The screw extruder (4) has built therein a screw (40) for kneading while at the same time leading the ceramic material (80) forward, and further has, on the front part thereof, a spatula portion (5) adapted to move over the inlet surface (30) of the filter unit (3) and there is a predetermined distance D between the spatula portion and the inlet surface (30).

Abstract: An extrusion molding apparatus for a ceramic molded product which is capable of passing a ceramic material smoothly through a filter unit is disclosed. The extrusion molding apparatus comprises a mold (11) for molding a ceramic molded product, a screw extruder (4) for supplying a ceramic material (80) to the mold (11), and a filter unit (3) for filtering the ceramic material (80) at the extrusion outlet (41) of the screw extruder (4). The screw extruder (4) has built therein a screw (40) for kneading while at the same time leading the ceramic material (80) forward, and further has, on the front part thereof, a spatula portion (5) adapted to move over the inlet surface (30) of the filter unit (3) and there is a predetermined distance D between the spatula portion and the inlet surface (30).

Abstract: A method and an apparatus capable of extrusion molding a comparatively wide, thin ceramic sheet using a screw extruder while suppressing the wrinkling thereof are disclosed. A molding apparatus (1) comprising a screw-type extruder (2) and a mold (11) at the forward end of the extruder (2) is used to extrusion mold a ceramic sheet from the ceramic material introduced into the extruder (2) by way of the mold (11). The extrusion molding is carried out while regulating the temperature of the portion of the ceramic material passing through the mold (11) corresponding to each of a plurality of areas (control zones) into which the mold (11) is divided.

Abstract: A ceramic heater which can be produced easily, induces no increase of production cost and can restrict the resistance change of a heating body due to migration. According to the present invention, a gap is formed between a ceramic sintered body and a heating body. Thus, migration in which cations are seized within the gap is caused so as to impede the cations from entering into the heating body. This makes it difficult for the cations to migrate and the volume in which the heating body is expanded is secured by the gap 13.

Abstract: A gas component detecting element using particles of metal oxide. The particles are prepared and calcined, and then subjected to a treatment which enlarges a specific surface area thereof. Catalyst particles are supported on the surface of these particles, and then the particles are sintered. The gas component detecting element is formed from these particles. A detector formed in this way can be used for a long period of time without any change in characteristics.

Abstract: Disclosed is a method for producing a gas component detecting element for detectors which comprises a sintered body of particles of a metal oxide wich changes in electrical resistance depending on relative atmosphere of combustible components in an exhaust gas, catalyst particles being supported on the surface of particles of the metal oxide, the method comprising the following steps:preparing particles of the metal oxide,calcining the particles of the metal oxide,subjecting the calcined particles to a treatment for enlarging specific surface area of the calcined particles,supporting catalyst particles on the surface of the particles subjected to the enlargement treatment, andsintering the particles which support the catalyst particles.The detector which has the above-mentioned gas component detecting element is also disclosed.