| 摘要 |
According to the preferred embodiment of the invention, a part (8) for positioning a tube is arranged between drive stops (spigots) (3) of a mandrel which includes a cylindrical body (2), then the mandrel is set into rotation while still allowing portions of tube (6) to slide in guides (5) keeping them in a defined orientation, so that a winding is obtained which includes a central segment from which helical turns extend, these helical turns being arranged in a symmetrical manner with respect to the central segment. <IMAGE>
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