PRODUCTION OF DENSELY DYED POLYAMIDE YARN HAVING HIGH STRENGTH AND HIGH MODULUS OF ELASTICITY

摘要

PURPOSE: To produce a polyamide yarn which is densely dyed and, at the same time satisfying the requirements of high strength and high modulus of elasticity by drawing a polyamide yarn in a low-temperature plasma atmosphere after dyeing it in dense colors. CONSTITUTION: A polyamide multifilament yarn containing at last >=75% caproamide unit in the recurring units of the polyamide fibers is densely dyed by a disperse dye or an acid dye in a cheese-state or a hank-state. Subsequently, the dyed yarn is subjected to drawing in a low-temperature plasma atmosphere generated in a reduced-pressure container containing a non-polymerizable gas such as argon and/or a polymerizable gas such as a fluorine-containing gas by glow discharge to obtain a polyamide yarn which is densely dyed and at the same time has high strength and high modulus of elasticity. By using some kind of gas, the yarn is also imparted with soil-proofness and hygroscopicity by the treatment.