| 摘要 |
<p>Multi-layer tubular structure comprises a band of synthetic organic polymer resin reinforced with fibres and wound in the shape of a cylinder around a horizontal axis in a series of convolutions of successive by increased diameter in order to define a longitudinal opening, the continuous surfaces of the successive windings of the band adhering to one another. Typical polymer materials include PVC, "Saran" polyolefins and "Nylons".</p> |
