| 摘要 |
PURPOSE:To surely remove the back pressure by supplying air in a slit connecting through with the last arrival part of molten metal in a cavity and making the slit into the negative pressure by ejector effect. CONSTITUTION:The air supplied from an air supplying hole 5 is flowed in the slit 3 from the air supplying gate A through an air supplying slit 4 and exhausted to the outer part from an opening hole. When the air is passed through the air supplying gate A, the ejector effect is developed and the upstream side slit 3 (the last arrival part 2 of molten metal in the cavity) becomes the negative pressure. By this negative pressure, the back pressure at the last arrival part 2 of molten metal in the cavity is removed. In accordance with this, the molten metal is flowed in the slit 3, where is the least flowing resistance, while inducing caused by the negative pressure.
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