Nippon Sheet Glass Company, Limited

Seiichiro Manabe

Yukihito Nagashima

Akira Hoshino

Hiroshi Samejima

Hiroyuki Tanaka

Shigeki Nakagaki

Takashi Sunada

Koji Yokoi

Mitsugi Yoshiyagawa

Kunio Nakaguchi

Yoshiyuki Inaka

Takemi Saijo

Tsutomu Sawano

Kouichi Sakaguchi

A vertical glass melting furnace of the type having an inlet for raw materials at the top thereof, an outlet for molten glass at the bottom thereof, and a tabular electric resistance heating element for melting which is immersed at some level in molten glass, has at least one opening, and covers almost entirely the cross-section of the furnace at that level, the vertical glass melting furnace comprising a stirrer which extends from above the furnace and passes through the batch layer and the tabular heating element so that the stirrer brings about forced circulation for homogenization of the molten glass which has passed through the tabular heating element and stays in the region below the tabular heating element.

Vertical glass melting furnace

A vertical glass melting furnace provided with a material entrance at the uppermost portion and a molten glass exit provided at the lowermost portion. A resistance heating element 6 is provided over the substantially entire part of the horizontal section of the furnace at at least one level which is immersed in the molten glass.

Glass melting furnace

Glass fibers having a low dielectric constant composed of a glass having a dielectric constant of not more than 5 and comprising:

Glass fibers having low dielectric constant

A furnace for cooling molten glass, which comprises a cooling tank for slowly cooling the molten glass while the average temperature of the molten glass is within a certain range extending below and above the temperature at which the speed of absorbing bubbles is highest, and cooling it rapidly when the average temperature of the molten glass is outside said range.

Furnace for cooling molten glass

A method for producing glass bubbles, which comprises heating a glass powder containing a gas-blowing agent in an atmosphere containing steam having a partial steam pressure of at least 0.2 atmosphere to foam it.

Method for producing glass bubbles

A method of cooling molten glass, which comprises slowly cooling the molten glass while the average temperature of the molten glass is within a certain range extending below and above the temperature at which the speed of absorbing bubbles is highest, and cooling it rapidly when the average temperature of the molten glass is outside said range.

Method of cooling molten glass

A process for the manufacture of glass raw material granular pellets is provided. The process comprises:

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Itami, Japan

Seiichiro Manabe