Spun polyester threads are produced by spinning together of the high tenacity and low elongation polyester fibers 1.2Dx38mm Bright or Semi-Dull into a single ply. Two or more plies are twisted to make a thread of the desired size. Ordinarily divided into two-for-one twister thread and non-two -for-one (Ring Spun )twister ,the former has the feature of few knot.