Composite twist core-spun yarn and method and device for its...

D - Textiles – Paper – 02 – G

Patent

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D02G 3/36 (2006.01)

Patent

CA 2538787

A substantially torqueless composite dual core-spun yarn (10) has a substantially inelastic central hard core (20) covered with a dual-spun fiber covering (30). The central hard core (20) has an elongation at break less than 50% and a Z or S twist, and the fiber covering (30) comprises fibers twisted on the core (20) with an S or Z twist opposite to that of the core. The opposite twists of the core (20) and of the covering (30) exert opposite and substantially equal torques. This yarn is produced by introducing two slivers (30A,30B) forming the covering (30) and a central (30) core in a spinning triangle (40). The core (20) is fed overtwisted S or Z and the slivers (30A,30B) have an opposite Z or S twist corresponding to about 30% to 70% of the twist of the fed overtwisted core (20) that detwists during spinning. The inelastic core (20) is fed at controlled speed to compensate for the angle of feed and to compensate for detwisting, and is guided into the spinning triangle (40) by a guide groove (52) in a feed roller (50).

L'invention concerne un fil double composite à âme (10) sensiblement exempt de moment de torsion, présentant une âme centrale dure sensiblement inélastique (20) recouverte d'un revêtement de fibres filées double (30). Cette âme centrale dure (20) possède une caractéristique d'allongement à la rupture inférieure à 50 % et une torsion Z ou S, et le revêtement de fibres (30) est composé de fibres torsadées sur l'âme (20) avec une torsion S ou Z opposée à celle de l'âme. Ces torsions opposées de l'âme (20) et du revêtement (30) exercent des couples de torsions contraires et sensiblement égaux. On prépare ce fil en introduisant deux brins (30A, 30B) constituant le revêtement (30) et une âme centrale dans un triangle de filage (40). L'âme (20) présente une surtorsion S ou Z et les brins (30A, 30B) présentent une torsion Z ou S opposée correspondant à 30 % à 70 % de la torsion excessive de l'âme (20) qui se détorsade pendant le filage. On fournit l'âme inélastique (20) à une vitesse régulée afin de compenser l'angle d'alimentation, ainsi que la détorsion, et on la guide dans le triangle de filage (20) par une rainure de guidage (52) d'un rouleau d'alimentation (50).

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