| 摘要 |
A woven wire cloth screen in which at least one fine mesh cloth 10 overlies a coarser mesh backing cloth. An additional coarser mesh cloth 12 is secured over the fine mesh cloth, whose mesh and wire size at least are selected so as to prevent large abrasive particles from making contact with the fine mesh cloth. Preferably, in a method of making the woven wire cloth screen a support frame is located in a jig, and each cloth is stretched over the frame and secured with clamps, a pressure is applied to the cloths before trimming any surplus wirecloth and finally removing a finished screen from the jig. Advantageously the screen is used to sift drilling mud recovered from a sea-bed drilling operation progressing through sub-sea strata composed of Utsira sand. |
