Screen Filter

摘要

A filter screen is formed by a first sheet metal frame having one or more cutout sections or a plurality of perforations. A first layer of screening is placed on top of the frame but does not extend to the edges of the frame. An optional second layer of screening may be placed over the top of the first layer such that it extends beyond the perimeter of the first layer but not to the perimeter of the frame. The assembly is then fusion bonded together and rolled into a tubular configuration. Abutting edges of the frame are welded together to form a rigid filter screen.

主权项

1. A filter screen assembly comprising:
a frame formed of sheet material having a plurality of perforations, said frame having top, bottom and side edges, a first screen positioned on the frame and having top and bottom edges of a given size so as to not extend to the top and bottom edges of the frame, the frame and screen being bonded to each other by a diffusion bond, the frame and screen being rolled into a cylindrical, conical or other tubular configuration wherein the top and bottom edges of the frame are in an abutting relationship, and means for securing the abutting top and bottom edges of the frame to each other to form a rigid filter screen assembly.