| 摘要 |
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. |
