Screening apparatus

Screening apparatus for fractionating material suspensions, comprising a first stationary member;

• a second rotatable member positioned on one side of said first member and arranged coaxially with and parallel to said first member, said second member being rotatable relative to said first member and cooperating therewith to form an open circumferential screening gap between adjacent outer peripheral edges of said first and second members;
• a supply chamber located radially outwardly of said screening gap and communicating therewith;
• a collecting chamber located radially inwardly of said screening gap and communicating therewith;
• inhibiting means for inhibiting the clogging of said screening gap with coarse suspension materials passing from said supply chamber to said collecting chamber through said screening gap, said inhibiting means including at least one projection extending into said screening gap from one of said first and second members, whereby said at least one projection rejects or defibrates coarse materials in suspensions passing from supply chamber to said collecting chamber through said screening gap so as to maintain said screening gap substantially open;
• and removing means extending from said second member and overlapping said screening gap for removing coarse suspension materials stuck in said screening gap.

Screening apparatus for fractionating material suspensions, comprising a first stationary member;

• a second rotatable member positioned on one side of said first member and arranged coaxially with and parallel to said first member, said second member being rotatable relative to said first member and cooperating therewith to form an open circumferential screening gap between adjacent outer peripheral edges of said first and second members, said second member including an annular ring which delimits one side of said screening gap;
• a supply chamber located radially outwardly of said screening gap and communicating therewith;
• a collecting chamber located radially inwardly of said screening gap and communicating therewith;
• inhibiting means for inhibiting the clogging of said screening gap with coarse suspension materials passing from said supply chamber to said collecting chamber through said screening gap, said inhibiting means including at least one projection extending into said screening gap from one of said first and second members, whereby said at least one projection rejects or defibrates coarse materials in suspensions passing from said supply chamber to said collecting chamber through said screening gap so as to maintain said screening gap substantially open;
• and generating means, provided on an outer peripheral edge of said annular ring, for generating pulsations in material suspensions passing through said screening gap to said collecting chamber.

Screening apparatus for fractionating material suspensions, comprising a first member;

• a second member positioned on one side of said first member and arranged coaxially with and parallel to said first member, said second member being rotatable relative to said first member and cooperating therewith to form an open circumferential screening gap between adjacent outer peripheral edges of said first and second members;
• an annular supply chamber located radially outwardly of said screening gap and communicating therewith, said supply chamber including an inlet arranged tangentially with respect to said supply chamber;
• a collecting chamber located radially inwardly of said screening gap and communicating therewith;
• and inhibiting means inhibiting the clogging of said screening gap with coarse suspension materials passing from said supply chamber to said collecting chamber through said screening gap, said inhibiting means including at least one projection extending into said screening gap from one of said first and second members, whereby said at least one projection rejects or defibrates coarse materials in suspensions passing from said supply chamber to said collecting chamber through said screening gap so as to maintain said screening gap substantially open.