| 摘要 |
A mold for injection molding is provided to decrease manufacturing cost and reduce resistance of a sprue part and a sprue in case of isolating a driving mold by forming a front end of a valve gate pin as a cone-type pin and the sprue as a trapezoid. A mold for injection molding comprises a cavity(C), a sprue bush(11), a sprue(14), a melt inflow path(12), a valve gate pin(13), a runner(15), a gate(13), a discharging plate(21), and a discharging pin(22). The sprue is shaped like a trapezoid and a front end of the valve gate pin is shaped like a cone-type pin. The outer incline of the sprue is below 45 degrees and the length is below 10mm. A free end has the same diameter with the valve gate pin and the same groove with the corn type pin. The height of the runner is 5mm. The incline of an opposite portion where the gate is formed is below 30 degrees.
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