| 摘要 |
A drying apparatus is provided with a gas burner indirect heat exchanger wherein a turn down ratio thereof maybe controlled. In a housing of the gas burner indirect heat exchanger, a gas burner and a heat exchanger are contained. Combustible gas in the gas burner is supplied to the heat exchanger. The air having entered the housing is heated as passing around the gas burner and, furthermore, passing through the heat exchanger. The housing is connected to the dryer booth by a blowing duct. A blower provided in a middle of the blowing duct supplies the hot air heated in the gas burner indirect heat exchanger to the dryer booth. In the dryer booth, an aluminum web coated with coating liquid is transferred. The hot air is blown to the coated surface of the aluminum web so as to dry the coated liquid.
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