Abstract: The performance of the blend spin pack was studied by the PET/PE blend spinning experiments. The SEM photographs of the PET/PE blend fiber were observed and analyzed，which is processed by universal spin pack （without static mixing disk）and blend spin pack （set-in static mixing disk）. Experimental results show that the blend spin pack can help improve the performance of the dispersed phase and hold backs their together again. With the increase number of the static mixing disk in the pack the dispersed phase particle in the blend fibers was more uniform and refining.

Key words: polyblend fiber, polyboend spin pack, static mixing disk, distribution uniformity