| 摘要 |
A runner ejection rod having a parting end shape capable of separating a molded product from a mold is provided to easily separate the product from a sprue bush only by changing the shape of the parting end of the runner ejection rod. A plastic mold includes an upper base(100), an upper core(200), a sprue bush(400), and a lower core(210). The upper core is coupled to the upper base. The sprue bush has a port for molten plastic. A parting part of a runner rod(300) has an angle between 30 degrees or 60 degrees with respect to a plane surface perpendicular to a central shaft of the runner rod. A semi-spherical groove is formed at the central portion of a profile of the runner rod. The semi-spherical groove has a diameter 0.3 to 0.7 times as great as a diameter of the runner rod.
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