| 摘要 |
PURPOSE: A manufacturing method of a sinker for fishing net is provided, which improves an efficiency of work and can reduce fabrication cost. CONSTITUTION: A manufacturing method of a sinker for fishing net comprises: a press compression process(S100) compressing a dough having a cement as main component by a press die in the outer circumference of rope and forming a sphere functioning sinker; and a drying process(S110) drying sphere and forming into a hard sphere. A press compression process comprises: a step of injecting a dough in low mold in which a groove of hemispherical shape is formed; a step of positioning a rope in a longitudinal direction in the center of upper side of the lower mold; a step of injecting a dough inside a penetration hole; and a step of forming a sphere functioning sinker on a rope outer circumference. |
