Centre Technique Industriel Dit: Institut Textile De France

Etablissement Public Dit: Agence Nationale De Valorisation

Michel E Vanhelle

The invention comprehends a method of twisting core strands, of the type comprising a sheath of fibres surrounding a central strand, a method in accordance with which a sliver of fibres is drawn between a point of entry of the said sliver and a pair of downstream drawing cylinders, a central strand is drawn under constant tension and is introduced without drawing into the sliver upstream of the said drawing cylinders, characterized in that a torsion in one sense and the other is conferred successively on the assembly constituted by the sliver of fibres and the central strand downstream of the said drawing cylinders. The invention further comprehends apparatus for twisting a core strand of the type comprising a sheath of fibres surrounding a central strand, the said apparatus comprising a double sleeve drawing assembly comprising drawing cylinders for the drawing of at least one sliver of fibres and a device feeding under constant tension at least one central strand for introducing the said central strand into a sliver of fibres upstream of the drawing cylinders downstream of the drawing assembly, characterized in that, it comprises an auto-twisting assembly disposed downstream of the drawing assembly and comprising auto-twist cylinders for conferring a torsion successively in one sense and the other on the assembly constituted by the sliver of fibres and the central strand.

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Wattrelos, France

Michel E Vanhelle