In the production of high quailty flat glass by the float process, tridymite-frost stone defects are avoided by providing burners in the refiner zone of the furnace to shield the crown from contact with alkili vapours and at the same time providing a barrier that separates the refiner zone headspace from the melter headspace and a means associated with refiner zone headspace for exhausting or venting it.
Origin
Unknown
Journal Title
U.S.P. 3 837 832, 24.9.74
Sector
Primary Papers
Class
PP 432