| 摘要 |
The present invention provides a tube for regenerating a pipeline which comprises a lower soft resin layer 5d, which is an inner layer of a linear part 5b of the tube, an upper soft resin layer 5e formed on an outside of the lower soft resin layer 5d, which is an outer layer of the linear part of the tube, and a ridge 5c spirally formed on an outer surface of the upper soft resin layer 5e, wherein the tube is characterized in that the ridge 5c is formed from a core 5g made of a hard resin being spirally wound, and a coating 5f for the core, wherein the coating is integrated with the upper soft resin layer 5e while the core is wrapped up in the coating, the core 5g has a height which is 3.5% to 5% of an inner diameter of the linear part 5b of the tube, the lower soft resin layer 5d is formed by spiral winding to comprise at least a single layer part 5ds, the single layer part 5ds has a thickness which is 0.25% to 0.65% of the inner diameter of the linear part 5b of the tube. The object of the present invention consists in ensuring the desired flattening strength of the tube and inhibiting the tube from the tearing and wrinkling which can be occurred on the tube during the drawing of the tube into the pipe. |
