Ngk Insulators, Inc.

Keiji Yasuda

Kazuhiro Miyahara

Koji Ogura

Kazuo Nakasako

Masahumi Yamaguchi

Tetsuo Kamijyo

Yuzo Ueda

A process for firing ceramic shaped bodies is disclosed, which comprises the step of making a heating temperature in a temperature range up to a decomposing temperature of a shaping aid contained in the ceramic shaped body smaller than that in a temperature range from the decomposing temperature to a firing temperature. A tunnel kiln is also disclosed, which comprises a preheating zone, a firing zone, a waste heat zone, combustion burners provided at the firing zone, an exhaust means provided at an inlet side of the preheating zone for evacuating combustion gases from the combustion burners outside the kiln, and another exhaust means provided at an outlet side of the preheating zone for evacuating the combustion gases outside the kiln.

Process for firing ceramic shaped bodies and a tunnel kiln used therefor

A process for firing ceramic shaped bodies is disclosed, which comprises the steps of placing the ceramic shaped bodies on a truck, and firing the shaped bodies with a combustion gas. Shield members are arranged on the truck such that a jet stream of the combustion gas will not directly contact the ceramic shaped bodies and that a path for the combustion gas jet stream may be formed on the truck. The shield member may be obliquely divided into two sections at the central portion thereof.

Process for firing ceramic shaped bodies and firing tools used therefor

A truck running on a rail laid in the firing furnace comprises a metallic frame body and a refractory base assembled thereon. At least an outside portion of the refractory base is comprised of car-top bricks each provided at its inward lower part with a foot portion and refractory base bricks located beneath the car-top bricks each provided with an engage portion engaging with a foot portion.

Truck for firing furnace

A tunnel furnace height detector used for detecting ceiling heights of a tunnel furnace. The detector includes a plurality of detecting units arranged on a trolley traveling in the tunnel furnace in a manner such that their heights are progressively lowered by predetermined distances. Each of the detecting units includes a support base, and a solid piece pivotally connected to the support base automatically returnable from a pivotally moved position forced by an external force to an original position. The solid piece has one end in contact with a lowered ceiling and the other end closing and opening a measuring circuit system forming a closed circuit.

Tunnel furnace height detector

A trolley transfer unit for a tunnel furnace is to be used between trolleys when ceramic sintered products are loaded onto and unloaded from the trolleys in sintering the products in the tunnel furnace. The trolley transfer unit comprises a bar member for connecting the two trolleys with a predetermined interval, protrusions provided at both ends of the bar member for engaging the trolleys to be connected, and a support bar secured to the bar member and engaging a frame of the other trolley to support the bar member.

Trolley transfer unit for tunnel furnace

A truck for use in a tunnel kiln is disclosed. The tunnel kiln is used for firing shaped bodies by heating them with use of a plurality of combustion burners provided on sides inside the tunnel kiln. The truck comprises supports. Among them, at least supports with which a combustion stream from the combustion burners directly contacts have a streamlined shape with respect to the combustion stream. By so constructing, turbulence of the combustion stream can be minimized to make temperature distribution more uniform inside the kiln.

Trucks for use in tunnel kilns

A tunnel kiln for firing ceramic shaped bodies including a preheating zone, a firing zone and a cooling zone. Arranged in the preheating zone is a recovery circuit composed of a decomposition product receiving part and a discharge port for discharging the recovered decomposition product.

Tunnel kiln for ceramic firing

A setter is disclosed which is made of ceramic honeycomb structural plate having longitudinal flow cells, and is provided with a bevelled portion at peripheral edge portion of an end face which is to be abutted against a green honeycomb structural body to be fired. A process for firing green honeycomb structural bodies by using such a setter is also disclosed.

Growing community of inventors

Aichi, Japan

Keiji Yasuda