POLYESTER SHORT FIBER HAVING EXCELLENT ANTIPILLING PROPERTY

To provide a polyester short fiber which is low in cost and has excellent antipilling properties, a woven or knitted fabric which comprises the same, and methods for producing them.SOLUTION: There is provided a polyester short fiber having one character grooves not parallel to a fiber axis direction in a fiber surface, and the grooves are present at a frequency of 300 or more to 3,000 pieces or less per mm of the fiber length. The polyester short fiber is composed of aromatic polyester which has repeating units consisting mainly of ethylene terephthalate and has an inherent viscosity [η] of 0.45 or more to 0.90 cm3/g or less. It is preferable that its tensile strength is 0.35 or more to 0.65 cN/tex or less and an impulse shown by a product between the square roots of the tensile strength and its elongation percentage is 1.20 or more to 2.40 or less and its knot strength is 0.20 or more to 0.55 cN/tex or less. A woven or knitted fabric comprising this polyethylene short fiber by 50 t.% or more has high antipilling properties.SELECTED DRAWING: Figure 1 【課題】コスト的にも安価であり、尚且つ優れた抗ピリング性能を有するポリエステル短繊維、それを含む織編物、及びそれらの製造方法を提供する。【解決手段】繊維表面に繊維軸方向に平行でない一文字状の溝を有し、前記溝が繊維長さ１ｍｍあたり３００箇所以上３０００箇所以下の頻度で存在しているポリエステル短繊維。ポリエステル短繊維は、エチレンテレフタレートを主たる繰返し単位とする固有粘度［η］が０．４５ｃｍ３／ｇ以上０．９０ｃｍ３／ｇ以下の芳香族ポリエステルから構成され、その引張強さが０．３５ｃＮ／ｔｅｘ以上０．６５ｃＮ／ｔｅｘ以下、その引張強さと伸び率の平方根の積で示される力積が１．２０以上２．４０以下、その結節強さが０．２０ｃＮ／ｔｅｘ以上０．５５ｃＮ／ｔｅｘ以下であることが好ましい。このポリエステル短繊維を５０重量％以上含有する織編物は、高い抗ピリング性を持つ。【選択図】図１