| 摘要 |
PURPOSE: To provide an injection molding method preventing the bleeding of gas, the generation of a sink and the crack of the corner part of a molded product. CONSTITUTION: In an injection molding method wherein a molten resin is injected into the molding space formed by clamping a pair of molds and gas is subsequently injected into the space to produce a molded product of which the predetermined part is hollow, the gas is injected under pressure over two stages and the ratio of the pressure of the gas to that of the resin in the cavity of the mold at the point of time when the gas is injected is controlled so as to be set to 1-below 4 in the first stage and 10 or more in the second stage. |
