Sheet glass is formed i travelling moulds in a thermal tunnel which is divided into a series of temperature controlled compartments or zones. Then first compartment maintains the glass in a fluid state, the second in a plastic state for processing against the mould, and the third contains the molten metal bath for finishing the glass sheet, now out of its mould.
Origin
Unknown
Journal Title
(U.S.P. 3 512 951, 19.5.70)
Sector
Primary Papers
Class
PP 279