To prevent adverse effect by heat from a heater, on a heat-resisting crystallized glass wall to improve its durability by optimizing positional relationship between a heat-resisting base wall and the heat-resisting crystallized glass wall constituting a furnace wall of a baking furnace.
A distance H in the longitudinal direction from a central shaft Z of the heater 9 to an outer face of the heat-resisting crystallized glass wall 5 is determined to satisfy the relationship of Dh/3dH (preferably, H1.5Dh/d), when D is a distance between the central shafts Z of the adjacent heaters 9, d is a distance between straight lines e, f extending in parallel in the longitudinal direction and respectively kept into contact with both side portions of an opening portion 11, and h is a distance in the longitudinal direction from the central shaft Z of the heater 9 as a start point to end points g, i where straight lines a, b respectively tilting toward an inner side while expanding from the central shafts Z, are kept into contact with both side portions of the opening portion 11.
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
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