Laminated gob for pressing glass articles

摘要

Method and apparatus is set forth for forming a laminated gob or charge of molten glass having a core glass which is not only completely surrounded by a skin glass but also has a reentrant portion of skin glass which projects inwardly within the core glass from the periphery of the molten charge intermediate its upper and lower extent. The reentrant portion of skin glass is formed within the charge during the gobbing cycle by momentarily retarding or retracting the outward flow of the core glass while simultaneously positively pulsing the flow of the skin glass. Thus, a laminated gob or charge of molten glass is formed which not only has a skin glass completely surrounding and encompassing a core glass but also has a reentrant portion of the skin glass which is continuous with the remainder of the skin glass surrounding the core glass. The reentrant skin glass portion of the gob projects within the inner more fluid core glass, such that when the charge is pressed into a glass article, the reentrant skin glass is forced outwardly with the flow of the hotter central core glass so as to form a continuous uniform skin about the extremeties of the pressed article.