Patent ID: 7044307
Filing Date: 2006-05-16
Classification: B01D

Abstract:
1. A drum type paper stock refine screen comprising: a lower water infiltration zone formed by infiltrating a lower circular part on a first end side of a laterally suspended rotary drum in a water tank containing washing water, said lower circular part of said first end of said rotary drum being disposed so as to be immersed in the washing water; a non-water infiltration zone continuous with said lower water infiltration zone on a second end side of said rotary drum; and a paper stock injection port for injecting a paper stock in said lower water infiltration zone, wherein a refined paper stock of the injected paper stock is passed into the water tank through air and water passage apertures formed in a wall which forms said rotary drum, wherein, in said lower water infiltration zone, foreign matter, which has not passed through said air and water passage apertures in said lower water infiltration zone, is discharged into said non-water infiltration zone, wherein said first end side of said rotary drum is provided with an inclination drum part that is gradually reduced in diameter toward said second end side of said rotary drum, wherein said inclination drum part is provided with a lower upward inclination surface that is arranged so as to guide the foreign matter toward said non-water infiltration zone, wherein a plurality of annular weir plates are arranged at an inner surface of said rotary drum so as to be axially spaced from one another such that said lower water infiltration zone is partitioned into a plurality of zones by said weir plates, wherein one of said annular weir plates is disposed at approximately an interface between said lower water infiltration zone and said non-water infiltration zone, wherein a plurality of raking fins are arranged between adjacent ones of said annular weir plates so as to guide the foreign matter toward said non-water infiltration zone by allowing the foreign matter to pass over said weir plate disposed at approximately the interface between said lower water infiltration zone and said non-water infiltration zone, and wherein a plurality of guide fins are arranged at an inner surface of said second end side of said rotary drum so as to guide the foreign matter toward a discharge port.