Abstract: To figure out ATY’s stretching characters and its featured structure concerned, two kinds of ATY were designed and spun. The result of testing to them showed that, comparing with filaments of similar linear density, ATY suffered obviously both loss of strength and loss of elongation at break, this seemed to be the result of the forming of disordered structure when the flat smooth filaments were texturing. Farther multi-texturing would grow the disorder structure up, thus bigger loss of strength and loss of elongation at break were to be tested out. There was an obvious difference in stretching curve between ATY and ordinary filaments, ATY’s curve showed a straight line all in all, it was not smooth with many zigzag tiny waves, that was the reflecting of featured snarling structure of ATY.

Key words: ATY, stretch performance, loss of strength, elongation at , break