Method for flame abrasion glass preform.

摘要

A large glass preform can be flame abraded and can have clear and smooth surface by using a method for flame abrading a surface of a rotating glass preform by an oxyhydrogen flame which moves along a length of the glass preform in which a movement velocity of the oxyhydrogen flame or a flow rate of oxyhydrogen of the oxyhydrogen flame is varied to conduct the flame abrasion treatment.