Ngk Insulators, Inc.

Masashi Otaka

Yutaka Ogawa

Shoji Asai

Tsunezo Takeuchi

Showji Asai

A method for producing a highly reliable ceramic honeycomb structural body having selectively, tightly sealed open end surfaces, including steps of attaching a film or mask on an open end surface of a ceramic honeycomb structural body, introducing a ceramic sealing material, preferably having a viscosity of 50-1,500 poises, into throughholes of said honeycomb body through apertures bored at selected positions of the film or mask, rapidly drying to solidify the sealing material followed by sintering. The drying step takes place 2 minutes after the introduction of the sealing material into the throughholes and is performed, preferably with hot air at 100.degree.-300.degree. C.

Method for producing ceramic honeycomb structural body

A method of producing a mask to be used for the production of a ceramic filter is disclosed, wherein an ultraviolet ray-transmitting film, which cannot transmit ultraviolet ray at the portion corresponding to the through holes of a porous ceramic honeycomb structural body, into which holes a sealing material is to be injected at the opening end surface of the body, and can transmit ultraviolet ray at the portion corresponding to the through holes of the body, into which holes the sealing material is not to be injected at the opening end surface of the body, is made; the film is arranged on an ultraviolet ray-curable resin; ultraviolet ray is irradiated to the resin through the film; and the ultraviolet ray-uncured resin portion is removed from the resin. The mask matches to the porous honeycomb structural body, and a ceramic filter can be easily produced from the body.

Method of producing a mask to be used for the production of a ceramic

The disclosed method and device use a gear rotatably carried by a holder and a movable support board supporting a film-attached ceramic honeycomb body, the gear having pointed teeth disposed at a suitable pitch, and as being thrusted into the body through the film attached to the body the gear is allowed to sway, so that the film is perforated at positions corresponding to selected open ends of throughholes of the body while allowing the gear to sway, so that the throughholes are selectively plugged by pressing sealant therein through the perforated film and the body is rendered into a ceramic honeycomb filter with filtering passages formed of partitions of the thus plugged throughholes.

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Mie, Japan

Masashi Otaka