| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rope that recognizes its existence by a reflected light even in darkness such as night, etc., without separately requiring a lighting device such as electric light bulbs, etc., and has no reduction in function for a long period of time. SOLUTION: In the rope obtained by twisting a plurality of second thread materials 2 and 3 around a first thread material 1 to be a core material to give a yarn 4, twisting a plurality of the yarns into a strand 9 and twisting a plurality of the strands 9, at least one second thread material 3 is composed of a refractive material having retroreflective function. COPYRIGHT: (C)2008,JPO&INPIT
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