Method and device for manufacturing steam-treated products

A method for manufacturing steam-treated products, which involves a steam treatment step that introduces steam into a container containing a treatment object and brings the treatment object into contact with the steam, and a treated object cooling step that cools the object treated with steam in the steam treatment step, wherein said treated object cooling step includes at least following steps:

• a coolant gas introduction step which introduces coolant gas into said container, until a gas pressure in the container reaches an outside air pressure level, and
• a coolant gas discharge step that discharges the introduced coolant gas from said container by using a gas discharge pump or gas discharge pumps after the coolant gas introduction step so that the gas pressure in said container goes below the outside air pressure level;
• wherein said treated object cooling step alternately repeats said coolant gas introduction step and said coolant gas discharge step.