Apparatus for screening paper fiber stock

Details Apparatus for screening paper fiber stock Apparatus for screening paper fiber stock

1987-06-04

1988-01-05

Kashnikow, Andres

Classifying, separating, and assorting solids

Sifting

With liquid treatment

209300, 209306, 209379, 209389, 209397, B07B 104, B07B 120, B07B 150, B07B 152

Patent

active

047174714

ABSTRACT:
In screening apparatus for paper making fiber incorporating a cylindrical screen member provided with cylindrical screening perforations, each of the perforations is characterized by a concentric frustoconical inlet end portion having a maximum diameter at the inlet surface of the screening member which is substantially greater than the portion of the perforation of minimum diameter, the maximum diameter of these inlet end portions being such that adjacent such portions closely approach or intersect each other to define multiple ridges on the surface of the inlet side of the screening member.

REFERENCES:
patent: 2942730 (1960-06-01), Fontein
patent: 3680696 (1972-08-01), Morin
patent: 4276159 (1981-06-01), Lehman
patent: 4287055 (1981-09-01), Holz
patent: 4447320 (1984-05-01), Lamort
patent: 4529520 (1985-07-01), Lampenius

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