METHOD AND APPARATUS FOR PROCESSING GLASS PIPE, AND GLASS PIPE

摘要

PROBLEM TO BE SOLVED: To suppress a glass pipe from being made oval in processing of inside CVD or diameter reduction by heating a starting glass pipe. SOLUTION: In the glass processing method, in the case of performing inside chemical vapor deposition or diameter reduction of a starting glass pipe G by relatively moving a heating furnace 20 equipped with a heating element 21 for annularly enclosing the circumference of the starting glass pipe G in a longitudinal direction of the starting glass pipe G with respect to the starting glass pipe G in which an outer diameter is 30 mm or more and a wall thickness is 3 mm or more and is less than 15 mm and an ovality of the outer diameter is 1.0% or less using a glass processing apparatus 1, a temperature of at least one of the heating element 21 and the starting glass pipe G is measured and the amount of heat generation of the heating element 21 is adjusted based on the measured temperature. COPYRIGHT: (C)2005,JPO&NCIPI