| 摘要 |
<p>PURPOSE: To obtain a bending rigidity as desired by varying the angle of winding fibers at each position of a ball hitting part, a tapered position or a deflecting part in a mandrel to orient the fibers for deriving the strength smoothly. CONSTITUTION: In a mandrel 5, a glass fiber 7 is impregnated with an epoxy resin 6 as thermosetting resin by a proper means and when winding the fiber with a FW molding device, the angleαof winding the fiber 7 is set large, for example, a value of 50-80 deg. at the position 1' of a ball hitting part of the mandrel 5 so that a strength is obtained for compression in the hitting of the ball considering a weight balance together to effectively derive a compression strength. In addition, the angleαof winding is reduced to, for example, a value of about 10-50 deg. to the position 3' of a deflecting part from the position 2' of a tapered part requiring a strength for bending. Thus, the fiber 7 is oriented to effectively derive a bending strength.</p> |
