PURPOSE: To produce the high-strength heat-insulating formed body having an excellent insulating effect to be used in an orifice for forming the gob of molten glass by incorporating an IR shielding agent and a fiber reinforcing material in combination into granular alumina and silica.
CONSTITUTION: The heat-insulating formed body 6 is used in an extrusion orifice 5 for forming the gob of molten glass. In this case, 10-70wt.% of the IR shielding agent such as TiO2, ZrO2 and carbon black and 3-30wt.% of the bulky ceramic fiber are incorporated into the superfine-grain alumina powder having 0.02μm grain diameter, 100m2/g specific surface and low heat conductivity to obtain a superfine-grain alumina composition, and the IR shielding agent and the fiber reinforcing material of the bulky ceramic fiber are incorporated into the super- fine grain silica having 0.01-0.02μm grain diameter and 100-400m2/g specific surface to obtain a superfine-grain silica composition. Both compositions along are used, or integrally formed in layers to obtain the formed body 6.
OGATA HARUHIKO
SATO KEIZO
TOYO GLASS CO LTD
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