| 摘要 |
PURPOSE:To simplify the manufacturing process, stabilize quality, and reduce the weight by constituting a racket frame with a core material made of a polymethacryl imide hard foam body having the specific gravity of a specific value and an outer shell made of a fiber reinforced synthetic resin. CONSTITUTION:A racket frame is formed with a core material 3 made of a polymethacryl imide hard foam body having the specific gravity of 0.05-0.2 and an outer shell made of a continuous fiber-reinforced resin. The nearly racket-shaped core material 3 is formed with the polymethacryl imide hard foam body having the specific gravity of 0.05-0.2, the core material 3 is coated with a racket frame molding prepreg 10, arranged in a die 11, clamped, heated, pressurized, hardened, and molded. The core material 3 also serves as a strength member, the frame has excellent compression strength and tenacity, the drawing strength of gut is improved, the durability of the racket frame is improved, the outer shell is made thin in thickness, and the racket frame can be made lightweight. |
