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    • 1. 发明公开
    • CARBON FIBER BUNDLE AND FLAMEPROOFED FIBER BUNDLE
    • 。。。。。。。。。。。。。。。。。。。
    • EP3029183A4
    • 2017-03-15
    • EP14832125
    • 2014-07-29
    • TORAY INDUSTRIES
    • OKUDA HARUKIYOMO TAKAYUKITANAKA FUMIHIKO
    • D01F9/14D01D5/253D01F6/18
    • D01F9/12C01B31/00C01B32/00D01D5/253D01F6/22D01F9/14
    • The invention aims to provide a carbon fiber bundle containing single-fibers having a quasi-oval cross-sectional shape so that the cause of an abnormality in strength, when it occurs, can be determined effectively. In the carbon fiber bundle, 40% or more of the single-fibers contained have a quasi-oval cross section perpendicular to the fiber direction and meet both Equations (1) and (2) given below: 1.03 ‰¤ La/Lb ‰¤ 1.20 (1) and 1.05 ‰¤ Ld/Lc ‰¤ 1.25 (2), wherein La is the length of the long axis which is defined as the line segment connecting the two points farthest away from each other on the circumference of the quasi-oval cross section of a single-fiber; Lb is the length of the short axis which is defined as the line segment extending perpendicular to the long axis, passing through the midpoint of the long axis, and connecting two points on the circumference; and when the long axis is divided into four equal parts to produce two line segments perpendicular to the long axis each of which passes through a point other than the midpoint of the long axis and connects two points on the circumference, Lc and Ld are defined as the length of the shorter one and that of the longer one, respectively.
    • 本发明的目的在于提供一种含有准椭圆截面形状的单纤维的碳纤维束,能够有效地确定发生强度异常的原因。 在碳纤维束中,所含单纤维的40%以上具有与纤维方向垂直的准椭圆形截面,满足以下公式(1)和(2):1.03‰¤La/ Lb‰¤ 1.20(1)和1.05‰Ld / Lc‰1.25(2),其中La是长轴的长度,其被定义为连接准准圆周上彼此最远的两个点的线段, 单纤维椭圆形截面; Lb是短轴的长度,其被定义为垂直于长轴延伸的线段,穿过长轴的中点,并连接圆周上的两个点; 并且当长轴被分成四个相等的部分以产生垂直于长轴的两个线段,每个线段通过除了长轴的中点以外的点,并且连接圆周上的两个点,Lc和Ld被定义为 较短的一个的长度和较长的一个的长度。