Screens for paper pulp purifiers

Details Screens for paper pulp purifiers Screens for paper pulp purifiers

1988-04-04

1990-02-06

Rolla, Joseph J.

Classifying, separating, and assorting solids

Sifting

With liquid treatment

209 17, 209393, B07B 104

Patent

active

048986658

ABSTRACT:
A screening device is provided with a screening element having a plurality of perforations going therethrough. Each perforation has an inlet and an outlet.
The screen element includes a plurality of step-type obstacle members positioned in the vicinity of the inlets of the perforations to produce turbulence in a flow of a fluid passing through the perforations. Each obstacle member has a shielding member positioned substantially above the inlet so that a gap is defined between the shielding member and the screening element. The shielding element extending over the inlet of the perforation forms an entry baffle above the outlet.
At least one blade having a hydrodynamic profile rotates at high speed above the shielding element.

REFERENCES:
patent: 2038931 (1936-04-01), Goldberg et al.
patent: 2827169 (1958-03-01), Cusi
patent: 3617008 (1971-11-01), Lamort
patent: 3939065 (1976-02-01), Ahlfors
patent: 4309284 (1982-01-01), Morimoto et al.
patent: 4405450 (1983-09-01), Selder
patent: 4529520 (1985-07-01), Halstrom

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