HEAT INSULATING DEVICE FOR ORIFICE FOR GLASS GOB

摘要

PROBLEM TO BE SOLVED: To prevent the devitrification of an orifice for a glass gob. SOLUTION: A heat insulating sleeve 2 is closely provided at the lower part of the orifice for the glass gob, which orifice has a platinum orifice 1 provided at its inside. When the diameter of the platinum orifice is defined as D and the diameter of the heat insulating sleeve 2 is defined as H, the ratio of H to D is set to be >1.1 and <2.5.