Ngk Insulators, Inc.

Kojiro Hayashi

Yoshihiro Sato

Shuji Ueda

Makoto Murai

Yuji Watanabe

Shungo Nagai

Michio Suzuki

Takayoshi Shibayama

The manufacturing method of the plugged honeycomb structure includes a honeycomb structure forming step of forming a pillar-shaped honeycomb structure, and a plugging step of forming plugging portions in end portions of the cells of the honeycomb structure formed in the honeycomb structure forming step, and in the plugging step, there is performed a press pouring operation of pressing one end face of the honeycomb structure into a plugging slurry stored in a bottomed tubular container to pour, under pressure, the plugging slurry into the cells of the honeycomb structure, and as the plugging slurry of the plugging step, there is used a slurry in which a yield point viscosity of a viscous fluidity is 600 Pa&#xb7;s or more, a recovery viscosity is 300 Pa&#xb7;s or more, and a high shearing viscosity is 200 Pa&#xb7;s or less.

Manufacturing method of plugged honeycomb structure

A circumferential coating material which is coated on a circumferential surface of a honeycomb structure monolithically formed by extrusion, to form a circumferential coating layer, the circumferential coating material containing fused silica in a range of 20 to 75 mass %, containing a color developing agent in a range of 5 to 50 mass %, containing colloidal silica in a range of 5 to 30 mass %, and further containing a silicon based water repellent agent in a range of 1 to 10 mass % to a total mass of the fused silica, the color developing agent, and the colloidal silica.

Circumferential coating material and circumferential coating honeycomb structure

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Nagoya, Japan

Kojiro Hayashi