| 摘要 |
<p>A liner for a water supply or other pipe comprises an extrusion of an elastomeric material (10), which is extruded in a semi-collapsed multi-lobed state, and encased in a heat shrinkable film (11). The film (11) is formed with lines of perforations (13) there along, and after shrinking the liner and film combination may be introduced into a pipe (12) and then expanded by applying water pressure within the liner, causing the liner to expand and tear the film along the lines of perforation (13), and expand the liner until it contacts the inner wall of the pipe (12).</p> |
