High strength polyamide yarn

A process for preparing a yarn which comprises the following steps:

• (a) providing a composition comprising a copolyamide comprised of at least 95 wt % with respect to the total weight of the copolyamide of (i) monomeric units derived from hexamethylene diamine and adipic acid, and (iia) cyclic monomeric units derived from a diamine X, and cyclic monomeric units derived from a diacid Y and/or (iib) cyclic monomeric units derived from an amino acid Z, wherein the monomeric units derived from the diamine X, the diacid Y and the amino acid Z are present in a summed amount of between 0.1 to 4.5 wt % with respect to the total weight of the copolyamide;
• (b) directing the composition to an extruder, optionally mixing the composition with additives, and melting the composition optionally mixed with additives in the extruder to obtain a molten composition;
• (c) extruding the molten composition through a spinneret to form filaments and thereafter stretching, cooling and combining the filaments to form at least one yarn;
• (d) subjecting the at least one yarn to a drawing process at a temperature between 25° C. and 265° C. to achieve a draw ratio between 4 and 6 to thereby obtain at least one drawn yarn;
• (e) relaxing the at least one drawn yarn by 4% to 10% in at least three relaxing stages while maintaining the at least one drawn yarn in a temperature range of 250° C. to 260° C.;
• and thereafter
• (f) winding up the at least one drawn yarn, wherein the at least one drawn yarn has a tensile strength of at least 80 cN/tex as measured according to ASTM D885-04.