US 12,123,141 B2Granted

Screen cylinder

AssigneeAikawa Fiber Technologies Oy

InventorsBenoit Martineau, Israel Paquette, Christophe Roger Hayart, Robert William Gooding

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Abstract

The present invention relates to a screen cylinder that is particularly suitable for screening, filtering, fractionating, or sorting cellulose pulp or fibre suspensions of the pulp and paper industry or other similar suspensions. The present invention relates more particularly to screening devices, which are usually cylindrical though also conical shapes are known. Such screening devices have basically two optional constructions. A first one comprises a plurality of screen wires positioned substantially axially and at a small spacing parallel to each other. The plurality of screen wires forms a screening surface facing the pulp or fibre suspension to be screened and adjacent wires form screening openings therebetween allowing an accept portion of the pulp or fibre suspension to flow therethrough. The second construction comprises a drilled or slotted sheet metal plate bent to a circular, or in broader terms, rotationally symmetrical shape.

Claims22

Dependent claims

A screen cylinder comprising,

a cylindrical screening media having circumferentially spaced axially extending perforations;
end rings fastened to opposite axial ends of the cylindrical screening media, and at least one annular support ring between the end rings, the end rings and at least one annular support ring forming a support structure supporting the cylindrical screening media;
the cylindrical screening media having a feed-side face and an exit-side face, the feed-side and said exit-side faces extending in a circumferential direction;
and
at least one disruptor bar attached to at least one of the support structure and cylindrical screening media, the disruptor bar extending in a mainly longitudinal direction of the cylindrical screening media at the feed side face thereof;
and
the at least one disruptor bar having a foot part and a head part, the foot part and the head part forming radially opposite ends of the disruptor bar, the at least one disruptor bar being fastened to the support structure or cylindrical screening media proximate its foot part, and two or more active edges provided in a cross-section proximate the head part of the at least one disruptor bar, the cross-section being taken in a direction perpendicular to a longitudinal axis of the at least one disruptor bar.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/485,663Filed 12 Oct 2023 · continuation
Priority: FI 2019568616 Aug 2019
Published: US 2024/0044077 A18 Feb 2024
Granted: 22 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

D21D 5/16
Straining or screening the pulp: cylinders and plates for screens
B01D 29/13
With bag, cage, hose, tube, sleeve or like filtering elements: supported filter elements
B01D 29/44
Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00;…:…
B01D 33/275
With rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces: using contiguous impervious surfaces

Family

PCT/FI2020/050521Parent of this continuation · filed 6 Aug 2020
Application17/023,485Parent of this continuation · filed 17 Sep 2020
US 2024/0044077 A1Pre-grant publication · published 8 Feb 2024
US 11,846,070 B2Parent of this continuation
US 2021/0047778 A1Published application
US 12,123,141 B2This patent

From the US filing history. Foreign family members aren’t listed.