Tarn count and skein break tests were performed with a scott tester (10 bobbins per sample) ; yarn elongation , tenacity and work to break were measured with an uster tensorapid (10 bobbins per sample and ten break per bobbin); yarn evenness was tested with an uster tester (10 bobbins per sample and 400 m per bobbin) as specified by american socity for testing and materials (ASTM) Standard D1425/D1425M