| 摘要 |
PURPOSE: A sinker and a manufacturing method thereof are provided, which enable to uniformly distribute raw material and to enhance strength by mixing iron and synthetic resin. CONSTITUTION: A sinker(1) includes a shot ball, synthetic resin, and a hardener. The shot ball(3) is made of iron material. The synthetic resin makes the shot ball have the shape of a sinker. The hardener hardens the synthetic resin. The shot ball has the ball type. The sinker more includes a pigment besides the iron, synthetic resin, and hardener. The synthetic resin is the unsaturated-polyester resin. |
