| 摘要 |
Cylindrical tube having a diameter with constant cross-section (constant cross-sectional diameter) intended, in particular, to form a support for material wound up by means of a mandrel (5) driven at a high rotational speed. According to the invention, it is produced by extrusion in a strong and flexible synthetic material and it has an inner wall (3) which includes at least one rib (4) which has a cross-section in the form of a flat projecting perpendicularly along one generatrix, which rib (4) transmits the mechanical forces resulting from the transformation of the properties of the plastic material during the post-withdrawal phase, preventing the deformations of the wall of the tube (1). <IMAGE>
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