Polypropylene staple fiber pure or blended spinning can be mixed in the cotton picking machine, a reasonable arrangement of the bale arrangement, should try to catch cotton Blender grasping ratio, the opening of the cotton mixer and carding machine mixing, and two And 8 × 8 and the merger, to ensure that the yarn into polypropylene staple fiber mix, easy to open the polypropylene, the general use of two cotton boxes, two open points, thugs should use comb needle thimble or cotton needle roller.