| 摘要 |
PURPOSE:To contrive the low projectile of an arrow, the stabilization of return of a bowstring after releasing it and the improvement of a hitting accuracy by a method wherein a polyethylene fiber material, aramid fiber material or PBO fiber material are combined to obtain a composite and stranded structure to activate the merits of both materials and maximize arrow speed as well as the restoring kinetic energy of the bowstring under the employing condition of same bow and arrow. CONSTITUTION:Respective required pieces of a first material thread 2, formed of a multitude of pieces of single yarn consisting of a super molecular weight polyethylene resin and bundled so as to have a predetermined size, and a multitude of pieces of second material threads 3, formed of a multitude of pieces of single yarn consisting of a poly-para-benzoamide resin or PBO resin and bundled so as to have a pedetermined size, are composed and bundled. |
