METHOD OF FORMING GLASS MATERIAL

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PROBLEM TO BE SOLVED : To provide a method of forming a glass material by which the glass material is formed to have a small cross section similar to that of the glass material while keeping the surface state of the glass material. SOLUTION : A preform before re-draw forming is shown by 10 in the figure, the cross section of the preform 10 has a cross sectional shape similar to a desired shape and the one end part of the preform 10 is fixed to a preform folder 20. The preform 10 is heated to have the viscosity ranging 106-108 poise by a heater 30 arranged in a path of the preform 10 with the downward movement of the preform folder 20 in the vertical direction and further is pulled by a pulling roller 40 provided at a lower position to be formed into a small material 11 having cross section similar to that of the preform 10.