Soft stretch yarns and their method of production

Details Soft stretch yarns and their method of production Soft stretch yarns and their method of production

D - Textiles, Paper

01

D

D01D 5/16 (2006.01) D01D 5/28 (2006.01) D01F 8/14 (2006.01) D02G 3/32 (2006.01) D03D 15/08 (2006.01)

Patent

CA 2310686

A soft stretch yarn substantially comprising polyester fibres has a stress, at 50% yarn stretch, of no more than 30 x 10-3 cN/dtex and, at the same time, a percentage recovery of at least 60%. Preferably, the Uster unevenness is no more than 2.0% and the crimp diameter is no more than 250 µm. This soft stretch yarn can be produced by spinning yarn of conjugate fibres comprising two types of polyester in which one component is PTT at a take-up velocity of at least 1200 m/min, drawing at a drawing temperature of 50 to 80°C at a draw ratio such that the drawn yarn tensile elongation is 20 to 45%, and then heat setting.

Un fil extensible souple constitué dans une proportion substantielle de fibres de polyester subit une contrainte, à 50 % d'étirement, d'au plus 30 x 10-3 cN/dtex et, parallèlement, un pourcentage de récupération d'au moins 60 %. De préférence, l'irrégularité Uster est d'au plus 2,0 %, et le diamètre de frisure est d'au plus 250  m. Ce fil extensible souple peut être obtenu grâce à l'enroulement de fibres conjuguées constituées de 2 types de polyester, l'un des composants étant un PTT dévidé à une vitesse d'au moins 1 200 m/min, étiré à une température d'étirage de 50 à 80 degrés Celsius à un ratio d'étirage tel que l'allongement du fil étiré en traction soit de 20 à 45 %, suivi d'une étape de thermofixation.

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