METHOD FOR HIGH SPEED STRANDING OF ARAMID YARNS

A method for stranding aramid yarn around an endless core includes a stranding step that involves a stranding apparatus having at least one yarn bobbin. The bobbin revolves around its own axis and the bobbin revolves around the core, wherein the yarn unwinds from the bobbin and winds around the core. The yarn is a continuous aramid yarn provided with 0.05 to 0.95 wt %, based on the weight of the aramid, of a finish including an organophosphorus compound. The organophosphorus compound is a compound of the formula X1X2X3P═O. X1, X2, and X3 are independently selected from Y1-, Y1-O—, and M-O. Y1 is a branched or straight-chain C1-C20 alkyl, aryl or alkenyl. M is selected from Li, Na, K, or ammonium. At least one of X1, X2, or X3 is selected from Y1- or Y1-O—. 1. A method for stranding aramid yarn around an endless core , comprising:providing the endless core to a stranding apparatus comprising at least one yarn bobbin,wherein the bobbin revolves around its own axis and the bobbin revolves around the core during operation of the stranding apparatus; andstranding the yarn around the core by unwinding the yarn from the bobbin and surrounding the core with the yarn, whereinthe yarn is a continuous aramid yarn provided with 0.05 to 0.95 wt %, based on the weight of the aramid, of a finish comprising an organophosphorus compound;the organophosphorus compound is a compound of the formula X1X2X3P═O;X1, X2, and X3 are independently selected from the group consisting of Y1-, Y1-O—, and M-O;Y1 is a branched or straight-chain C1-C20 alkyl, aryl or alkenyl;M is Li, Na, K, or ammonium; andat least one of X1, X2, or X3 is Y1- or Y1-O—, and the different types of Y1 are the same or different.2. The method according to claim 1 , wherein the continuous aramid yarn is provided with 0.10 to 0.50 wt % of the finish.5. The method according to claim 4 , wherein:R1 is a branched or straight-chain C4-C12 alkyl, andR2 is H, Li, Na, K or NH4 or a branched or straight-chain C4-C12 alkyl.6. The ...

Method for high speed stranding of aramid yarns

The invention pertains to a method for stranding aramid yarn around an endless core, wherein the core is provided for a stranding step to a stranding apparatus comprising at least one yarn bobbin, wherein during operation the bobbin revolves around its own axis and the bobbin revolves around the core, and unwinding the yarn from the bobbin around the core to provide a core surrounded by the yarn, wherein the yarn is a continuous aramid yarn provided with 0.05 to 0.95 wt%, based on the weight of the aramid, of a finish comprising an organophosphorus compound, wherein the organophosphorus compound is a compound of the formula X1X2X3P=O, wherein X1, X2, and X3 are independently selected from Y1-, Y1-O-, and M-O, wherein Y1 is a branched or straight-chain C1-C20 alkyl, aryl or alkenyl, with M being selected from Li, Na, K, or ammonium, with the proviso that at least one of X1, X2, or X3 is selected from Y1- or Y1-O-, wherein the different types of Y1 may be the same or different. In one embodiment, the continuous aramid yarn is provided with 0.10 to 0.50 wt% of the finish. It has been found that the use of a relatively minor amount of a finish comprising a specific organophosphorus compound results in an improved package stability on a rotating server with a rolling yarn take-off. Consequently, packages of aramid yarns provided with this finish allow for high speed stranding of aramid yarn around an endless core.

Method for high speed stranding of aramid yarns

The invention pertains to a method for stranding aramid yarn around an endless core, wherein the core is provided for a stranding step to a stranding apparatus comprising at least one yarn bobbin, wherein during operation the bobbin revolves around its own axis and the bobbin revolves around the core, and unwinding the yarn from the bobbin around the core to provide a core surrounded by the yarn, wherein the yarn is a continuous aramid yarn provided with 0.05 to 0.95 wt%, based on the weight of the aramid, of a finish comprising an organophosphorus compound, wherein the organophosphorus compound is a compound of the formula X1X2X3P=O, wherein X1, X2, and X3 are independently selected from Y1-, Y1-O-, and M-O, wherein Y1 is a branched or straight-chain C1-C20 alkyl, aryl or alkenyl, with M being selected from Li, Na, K, or ammonium, with the proviso that at least one of X1, X2, or X3 is selected from Y1- or Y1-O-, wherein the different types of Y1 may be the same or different. In one embodiment, the continuous aramid yarn is provided with 0.10 to 0.50 wt% of the finish. It has been found that the use of a relatively minor amount of a finish comprising a specific organophosphorus compound results in an improved package stability on a rotating server with a rolling yarn take-off. Consequently, packages of aramid yarns provided with this finish allow for high speed stranding of aramid yarn around an endless core.

Method for high speed stranding of aramid yarns

Method for high speed stranding of aramid yarns.

La invención se refiere a un método para trenzar hilo de aramida al rededor de un núcleo sin fin, en donde se proporciona el núcleo para un paso de trenzado a un aparato de trenzado que comprende por lo menos un carrete de hilo, en donde durante la operación el carrete gira al rededor de su propio eje y el carrete gira al rededor del núcleo, y desenredar el hilo desde el carrete al rededor del núcleo para proporcionar un núcleo rodeado por el hilo, en donde el hilo es un hilo de aramida continuo provisto de 0.05 a 0.95 % en peso con base en el peso de la aramida, de un acabado que comprende un compuesto organofosforado, en donde el compuesto organofosforado es un compuesto de la fórmula X1X2X3P=O, en donde X1, X2, y X3 se seleccionan de manera independiente de Y1-, Y1-O- , y M-O, en donde Y1 es un alquilo, arilo o alquenilo de C1C20 ramificado o de cadena recta, y en donde M se selecciona de Li, Na, K, o amonio, con la condición de que por lo menos uno de X1, X2 o X3 se seleccione de Y1- o Y1-O-, en donde los distintos tipos de Yl pueden ser iguales o distintos; en una modalidad, el hilo de aramida continuo está provisto con 0.10 hasta 0.50 % en peso del acabado; se ha encontrado que el uso de una cantidad relativamente pequeña de un acabado que comprende un compuesto organofosforado específico tiene como resultado una estabilidad de paquete mejorado en un servidor giratorio con una entrega de hilo giratoria. En consecuencia, los paquetes de hilos de aramida provistos de este acabado permiten el trenzado a alta velocidad al rededor de un núcleo sin fin.