| 摘要 |
PURPOSE:To obtain a molded part, the gate mark of which does not offend the eye, by a method wherein an injection mold, in which runners are connected through gates to the inner sides of J-shaped cavities opposite to each other. CONSTITUTION:Firstly, a plurality of cavities 10 for molding handle of long umbrella are arranged so that the inner sides 11 of two parallel J-shaped cavities 10a and 10b face opposite to each other. Secondly, injection molding is performed by employing an injection mold 14, in which each runner 13 is connected through a gate 12 to the inner side 11 of each of the cavities 10a and 10b. A molded J-shaped handle 16 has a gate mark 18 on its inner side surface 17. As a result, the gate mark 18 is unobtrusive under the actual use conditions of the handle 16 or the like as compared with the conventional gate mark, which is left on the outer side surface. |
