| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fiber material for belt reinforcement that is excellent in dimensional stability and fatigue resistance, and particularly, extremely excellent in durability after dynamic fatigue, and a belt made using the same. <P>SOLUTION: A fiber material for belt reinforcement comprising a polyester fiber is provided. The polyester fiber contains ethylene terephthalate as a main repeating unit, in which a long period by small-angle X-ray diffraction is 9 to 12 nm, the terminal carboxyl group amount in the fiber is not less than 20 equivalent/ton, a surface treatment agent having an epoxy group adheres to the surface of the fiber. Furthermore, it is preferable that the terminal carboxyl group amount in the surface of the polyester fiber is not more than 10 equivalent/ton and the crystal size in the horizontal axis direction of the polyester fiber is 35 to 80 nm<SP POS="POST">2</SP>. It is also preferable that the polyester fiber is a twisted fiber cord and forms a warp yarn of woven fabric. <P>COPYRIGHT: (C)2013,JPO&INPIT |
