Abstract: Operating a strainer using centrifugal force generated by the rotation of a bottomed cylindrical vessel having filtering holes in a side surface. The strainer can eliminate the clogging of the filtering holes and maintain the optimal straining effect while maintaining the optimal pressure and duration of pressing food ingredients. The strainer catches a filtrate discharged through the filtering holes of the bottomed cylindrical vessel to the outside of the vessel while rotating the bottomed cylindrical vessel, which contains an object to be strained input therein, in a predetermined rotation direction at a first rotation speed, rotating the rotary pressers in the same rotation direction as the bottomed cylindrical vessel at a second rotation speed different from the first rotation speed of the bottomed cylindrical vessel by a predetermined speed difference.

Abstract: A strainer device that collects a filtered object even when the strainer device is used with an object to be strained that is low in water content and highly adhesive, via softening by heating in superheated steam. The strainer device has an inner surface that is circular in cross section, surrounds a strainer vessel, and is supported so as to be rotatable about a central axis thereof; a scraping member that is disposed at a predetermined position along the inner surface of the cover body and scrapes the filtered object adhering to the inner surface when the cover body is rotating; the strainer vessel and the cover body rotate. When the strainer vessel is rotating, the filtered object pushes out of the filtering hole and adhers to the inner surface of the cylindrical cover body and is scraped off at the predetermined position on a circumference along the inner surface.