Filtering screens for vibratory separation equipment

• US 20030148680A1
• Filed: 11/25/2002
• Published: 08/07/2003
• Est. Priority Date: 03/11/2000
• Status: Active Grant

• Current Assignee: United Wire Ltd (SLB)
• Original Assignee: United Wire Ltd (SLB)
• Inventors: Thomson, Robert Ian, Cook, Gordon James
• Granted Patent: US 6,825,136 B2
• Time in Patent Office: Days
• US Class Current: 442/1
• CPC Class Codes: B01D 39/12 of wire gauze; of knitted wire; of expanded metal
• CPC Class Codes: Y10T 442/10 Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
• CPC Class Codes: Y10T 442/109 Metal or metal-coated fiber-containing scrim
• CPC Class Codes: Y10T 442/30 Woven fabric [i.e., woven strand or strip material]

Abstract

A filtering screen comprises a fine woven wirecloth filtering mesh (4) disposed above a coarse woven wirecloth support mesh (2). An intermediate woven wirecloth mesh (3) is disposed between the fine woven mesh (4) and the coarse woven mesh (2). the intermediate mesh (3) extending over a proportion of the area therein at outwards the rear thereof, said proportion being in the range of 20% to 40% of the area of the screen, and preferably substantially one third of the area of the screen.

Claims

1. A filtering screen comprising a fine woven wirecloth filtering mesh disposed above a coarse woven wirecloth support mesh, wherein an intermediate mesh, made of woven wirecloth, a woven synthetic plastics material or a perforated synthetic plastics material, is disposed between the fine woven mesh and the coarse woven mesh, the intermediate mesh extending over a proportion of the area of the screen at or towards the rear thereof, said proportion being in the range of 20% to 40% of the area of the screen.

2. A filtering screen according to claim 1, wherein said proportion is substantially one third.

5. A filtering screen according to any of the preceding claims, wherein the intermediate mesh has a mesh count smaller than the fine mesh and larger than the coarse mesh.

3. A filtering screen according to claim lor 2, wherein the three meshes are differentially tensioned and retained in a frame.

4. A filtering screen according to claim 3, wherein the tension applied to the intermediate mesh is less than the tension applied to the support mesh but more than the tension applied to the filtering mesh.