To provide a heating furnace equipped with a low-cost furnace tube which is highly stable and excellent in durability; and a method for processing glass using the same.
The heating furnace 10 is equipped with a cylindrical furnace tube 13, formed by stacking a plurality of divided bodies 14a-e in the axial direction, and heaters 16a-c provided on the outer periphery of the furnace tube 13. The heating furnace is used for heating and processing a porous glass preform in the furnace tube 13. The divided bodies 14a-e are mutually stacked through ring-shaped spacers 15a-d. Each of spacers 15a-d has a spacer part arranged between the end faces of the divided bodies 14a-e and wall parts 19 which are extended in the axis direction of the divided bodies 14a-e and brought into contact with the divided bodies 14a-e in at least one side of the outer peripheral side and the inner peripheral side of the divided bodies 14a-e.
SUGIYAMA TAKU
AKAIKE NOBUYA
HAYAKAWA TAMOTSU
MORI KUNIHIKO
Noriaki Miyakoshi
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