公开(公告)号：US10689778B2

公开(公告)日：2020-06-23

申请号：US15537866

申请日：2015-12-05

Applicant: TRUETZSCHLER GMBH & CO. KG ,  DSM IP ASSETS B.V.

Inventor： Lassad Nasri ,  Roman Stepanyan ,  Martinus Joseph Maria Keulers

IPC: D01D5/16 ,  C08G69/46 ,  D01D4/02 ,  D01F6/60 ,  D02G3/02 ,  D02G3/44 ,  D02J1/22

Abstract: A process and an apparatus for production of a low-shrinkage aliphatic polyamide fibre, in which polyamide is extruded through a spinneret to form filaments, then cooled and combined to form at least one yarn. The at least one yarn is subjected to drawing between the spinneret and a pair of inlet rolls, then in a further multi-stage drawing step is subjected to 4-fold to 6-fold drawing by pairs of draw rolls. The pairs of draw rolls successively heat the yarn and at least the last pair of draw rolls has a temperature of 5° C. to 20° C. below the melting point of the yarn. The yarn is relaxed by from 6% to 10% in a subsequent at least three-stage relaxation zone and is kept in a temperature range of 5° C. to 15° C. below the melting point of the yarn, and is subsequently wound up on a reel device. The invention further relates to a yarn composed of a low-shrinkage aliphatic polyamide fibre.

公开(公告)号：US10370780B2

公开(公告)日：2019-08-06

申请号：US15551633

申请日：2016-02-23

Applicant: DSM IP ASSETS B.V.

Inventor： Martinus Joseph Maria Keulers ,  Roman Stepanyan ,  Hao Chen

IPC: D02G3/04 ,  D01D5/16 ,  D01F6/80 ,  D02G3/44

Abstract: The invention relates to a yarn comprising a copolyamide in an amount of at least 90 wt % with respect to the total weight of the yarn, which copolyamide comprises a) at least 95 wt % by weight with respect to the total weight of copolyamide, monomeric units derived from hexamethylene diamine and adipic acid and b1) cyclic monomeric units derived from a diamine X, and cyclic monomeric units derived from a diacid Y, and/or b2) cyclic monomeric units derived from an amino acid Z, in which the summed amount of monomeric units derived from X,Y and Z is between 0.1 to 4.5 wt % by weight with respect to the total weight of the copolyamide and wherein the yarn has a tensile strength of at least 80 cN/tex as measured according to ASTM D885-04. The invention also relates to a process for preparing the yarn.