Patent ID: 6638456
Filing Date: 2003-10-28
Classification: D01D,D01F

Abstract:
A process of producing synthetic threads from a polyester-based polymer mixture, whereina) a first stream of a polyester melt is divided into a second and a third polyester stream, the flow rate of the first stream being 100 to 2000 kg/h and the flow rate of the second polyester stream being 5 to 300 kg/h, b) 0.2 to 100 kg/h of a molten additive polymer are metered to the second polyester stream, and the additive polymer together with the second polyester stream is passed through a first mixing line comprising a line with flow obstacles to form a first polymer mixture whose content of additive polymer is 3 to 50 wt-%, wherein the ratio of the melt viscosity of the additive polymer and of the polyester of the first stream is 0.8:1 to 10:1, c) the first polymer mixture is passed through a line portion and introduced into the third polyester stream, and the first mixture together with the third polyester stream is passed through a second mixing line having flow obstacles, thereby forming a second polymer mixture, and d) the second polymer mixture is extruded to obtain filaments, which are cooled and combined to threads, and the threads unwound with speeds of at least 1000 nl/min.