Patent ID: 8303769

Claim:
Apparatus for screening a cellulose pulp stream comprising a housing, a first screen member contained within said housing including screen openings for permitting a first predetermined accept portion to pass therethrough and for crating a first reject portion, a second screening member contained within said housing including screen openings for permitting a second predetermined accept portion to pass therethrough and for creating a second reject portion, a primary inlet for directing said cellulose pulp stream into said housing, an accept outlet for withdrawing said second predetermined accept portion from said housing, a reject outlet for withdrawing at least one of said first and second reject portions from said housing, a first screening chamber for receiving said cellulose pulp stream from said primary inlet for transfer to said first screen member, a first accept chamber for receiving said first predetermined accept portion of said cellulose pulp stream which has passed through said first screen member, a second screening chamber for directing said first predetermined accept portion of said cellulose pulp stream from said first accept chamber to said second screen member, a secondary pulp inlet for receiving a second cellulose pulp feed stream comprising a screened cellulose pulp accept fraction and directing said second cellulose pulp feed stream to said second screen member, whereby said second predetermined accept fraction is delivered to said accept outlet.