Abstract: A drum type paper stock refine screen is provided which is capable of efficiently filtering a refined paper stock to the outside of a laterally suspended rotary drum and efficiently discharging foreign matter to the outside of the drum while rotating the drum. The drum type paper stock refine screen includes a lower water infiltration zone formed by infiltrating a lower circular part on one end side of a laterally suspended rotary drum in a water tank, a non-water infiltration zone continuous with the lower water infiltration zone on the other end side of the rotary drum, and a paper stock injection port for injecting a paper stock in the lower water infiltration zone.

Abstract: The present invention provides a drum type refining or washing apparatus in which the refining or washing efficiency of a pulp suspension or a food suspension is remarkably enhanced by the filtration function of a rotary drum and by the filtrate sucking force of a filtrate receptive cell.

Abstract: The present invention provides a drum type paper stock refine screen capable of efficiently filtering a refined paper stock to the outside of a laterally suspended rotary drum and efficiently discharging foreign matter to the outside of the drum while rotating the drum.

Abstract: Baffle plates 9 extending in a peripheral direction along an internal surface of an air-permeable and water-permeable drum 1 are spacedly arranged in an axial direction, and paper stock cleaning zones 10 are formed between the every adjacent pair of baffle plates 9. Raking plates 12 for raking up paper stock liquid in the cleaning zones 10 in a direction of rotation of the drum are spacedly arranged in the peripheral direction between the adjacent baffle plates 9. The raking plates 12 are allowed to project from internal edges of the baffle plates 9. The paper stock moves, zone by zone, through the cleaning zones 10 formed between the baffle plates 9 and reaches a paper stock outlet port 5. The paper stock, when in the paper stock cleaning zones 10, is raked up in the peripheral direction by the raking plates 12 in accordance with rotation of the air-permeable and water-permeable drum 1 and falls by force of gravity, repeatedly.