| 摘要 |
<p>A filter screen assembly comprises a rectangular principal frame (12) of moulded plastics material and subdivided by crosspieces (14,16) to form sub-areas (18). Each sub-area receives as a releasable snap-fit a plastics moulded insert (20) in the form of a sub-frame carrying one or more tensioned screen meshes (Figure 1). A peripheral sealing gasket may seal the joint between each sub-area (18) and the insert (20)</p> |
