Smoothing agent AX-H300 is a softener used in the winding process of cotton, polyester-cotton fiber dyed with reactive, disperse or other dyes. It has the performance of reducing friction between fibers/fibers/metals, it can facilitate the opening of dyed yarns, therefore, the stoppage caused by yarn breakage in the winding process can be reduced especially during continuous yarn processing.The same effect can be achieved in alkali treatment or continuous mercerizing and ring spinning process