| 摘要 |
A screen member for use in collecting and/or distributing process flow streams has profiled elements (20, 28) welded to channel-shaped support members (22, 30) and is preferably made by helically wrapping and welding a profiled wire around the elongate channel members which are rotated about the screen axis to produce a cylindrical slotted screen which is then cut along a line parallel to its axis, flattened, and either used flat or rerolled and welded at right angles to its original direction so that the channels (22, 30) form the hoop-like supports shown in the Figure. The channels are apertured (26, 34) and preferably to such an extent that the total open area for an inlet stream flow on the channel side of the screen member is less than the open area of the slots on the wire side of the screen member. Thus, the pressure drop through the screen member is controlled by the apertures in the channel members with the result that the screen surface can be provided with slot widths of optimum size relative to the particle size of material to be contacted thereby. |
