RADIATION REFLECTOR FOR USE IN GLASS FORMING CHAMBER

摘要

A radiation reflector in the inlet portion of a flat glass forming chamber is used to reflect sufficient heat that is radiated from the glass immediately after delivery onto molten metal in the chamber back to the glass so that the glass loses heat relatively more rapidly through its bottom surface than through its top surface and is maintained sufficiently hot immediately following delivery onto the molten metal to have an average viscosity between 103 and 105 poises during its initial residence on the molten metal and to have an initial rate of temperature decline that is slow relative to its rate of temperature decline thereafter. The glass produced is of improved optical flatness.