Patent ID: 6923329

Claim:
A screen apparatus comprising: a tank having an inlet portion of a paper stock, a first selection outlet portion and a second selection outlet portion, a first cylindrical screen disposed inside the tank and having a plurality of openings at a side surface thereof so that the first cylindrical screen divides the tank into a first chamber inside the first cylindrical screen communicating with the first selection outlet portion and a second chamber outside the first cylindrical screen, a second cylindrical screen disposed inside the tank to be located outside the first cylindrical screen, said second cylindrical screen facing the first cylindrical screen and having a plurality of openings so that the second cylindrical screen divides the second chamber into a second′ chamber facing the first cylindrical screen and having upper and lower portions communicating with the inlet portion and a second″ chamber communicating with the second selection outlet portion, a stirring member having stirring portions located inside the second cylindrical screen and outside the first cylindrical screen, said stirring member being rotatably supported for stirring the paper stock in the second′ chamber, a connection member formed at an intermediate portion of the second cylindrical screen and having a groove communicating with the second′ chamber between the second cylindrical screen and the first cylindrical screen, and a passage communicating with the groove for discharging the paper stock, and a paper stock discharging passage connected to the passage of the connection member so that the paper stock entering into the tank through the inlet portion flows to the second′ chamber through the upper and lower portions thereof, a part of the paper stock passing through the first and second cylindrical screens being discharged through the first and second selection outlet portions, and a part of the paper stock not passing through the first and second cylindrical screens flowing to the opening and being discharged through the passage from the tank.