Ultra-high molecular weight polyethylene fibers were prepared by dry spinning and the effect of the draw-down ratio on the follow-up draft of UHMWPE was studied on. The extensional forces in the draw-down process were measured at the exit of the spinning duct by tension meter and the tensile stresses of the draw-down were calculated. Based on the two-component model of tensile stress-viscosity

the N

s

kT values were calculated in the fitting process and then the draw-down ratios were determined. The results showed that the maximum follow-up draft ratio was 23.3 and the fiber strength and modulus were 30cN·dtex

-1

and 1200cN·dtex

-1

respectively when the draw-down ratio was 13.