| 摘要 |
PROBLEM TO BE SOLVED: To halve the preheating time for a roll to be newly dipped into a pot and to uniformize the temp. distribution by in5erting a roll inside heating means different from a heating means for the roll surface from the opening of the roll and controlling both heating means with a good balance. SOLUTION: The outer surface of a sink roll 4 is fitted with a flexible electric heater 6. The electric heater 6 has a two-pieces divided structure and has heater capacitance of about 100 KW in total, and whose back face is coated with a heat insulating layer. A simplified gas burner 11 is inserted into the inside face of the sink roll 4 from the opening 10 of the roll edge face. Or, a radiant tube or a rod-shaped electric heater executing gas burning at the inside is used instead of the gas burner. The set temp. of the electric heater 6 is set to the preheating objective temp., and the set temp. of the simplified gas burner 11 at the inside is highly set to the preheating objective temp. While the roll surface temp. is measured, the sink roll 4 is heated from the inside and outside faces, and the roll surface temp. is raised to the objective temp.
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