| 摘要 |
<p>A method and means of slip control for helically wound pipes wherein the pipe (1) is formed by helically winding a strip (2) of plastics material and the edges (8) of the convolutions of the strip are interconnected, wherein a slip-control member (20) applied to the interconnected edges (8) of the convolutions of the strip is arranged to be withdrawable progressively from the pipe (2) to allow slip linearly between the interconnected edges of the convolutions of the pipe when torque is applied to the pipe.</p> |
