Method for the production of a yarn spool-holder tube, device for making same, spool-holder tube thus obtained and use method for said spool-holder tube

摘要

Consists in that a cardboard tube, with respect to a narrow marginal end area of the same provided with a hollow interior roll, is applied against a rotatory die which has a concave surface suitable for forming an entrant perimetric step by means of constriction of said narrow marginal area, the diameter of the riser thereof being equal to the interior diameter of said cardboard tube and, at the same time, against said interior hollow roll is applied a force of enough intensity to flatten the cavity of the interior hollow roll and apply the wall thereof against the interior face of the wall of the cantilevered end of the cardboard tube formed by the action of said rotatory die.