Reducing end breaks in the spinning or twisting of yarn

Details Reducing end breaks in the spinning or twisting of yarn Reducing end breaks in the spinning or twisting of yarn

D - Textiles, Paper

01

H

D01H 1/02 (2006.01) D01H 1/11 (2006.01) D01H 7/92 (2006.01) D02G 1/08 (2006.01)

Patent

CA 2247242

A method and apparatus for twisting a travelling fibre assembly (7) to form a twisted yarn (9), in which the strand is drawn from nip means (14) and rotated to insert twist into the yarn. Downstream of the nip, the twisted yarn is drawn past and in engagement with at least one run (34 or 35) of travelling continuous belt means (30) so that a surface or surfaces of the belt means rotates the yarn and inserts a false twist into the yarn towards the nip. The surface(s) is convexedly curved in the direction of travel of the yarn, and the yarn engages the surface(s) over a total curved line contact which is sufficient to materially reduce the transmission of tension in the yarn past the surface(s) towards the nip.

Procédé et appareil permettant de retordre un ensemble à fibre en défilement (7) afin de former un fil retors (9). On tire le fil simple à partir de moyens de pinçage (14) et on le fait tourner afin d'y introduire une torsion. On fait défiler le fil retors au contact d'au moins un brin (34 ou 35) d'une bande sans fin en défilement (30) en aval du point de pinçage, afin que la surface ou les surfaces de la bande fasse tourner le fil pour y introduire une fausse torsion en direction du point de pinçage. La (les) surface(s) présente(nt) une courbure convexe dans le sens de l'avance du fil, et le fil vient au contact de la (des) surface(s) selon une ligne courbée de contact total suffisant pour réduire matériellement la transmission de tension dans le fil au-delà de la (des) surface(s) et en direction du point de pinçage.

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