| 摘要 |
PURPOSE: To perform multistage injection into a product cavity in a manner a slow speed injection at first and then a high speed injection are conducted. CONSTITUTION: Molten resin is poured at a certain speed from a sprue 2 communicating with a runner 3, which communicates through the product gate 4 with a product cavity 5, under the condition that resin wells 7 having a very small volume are branchedly formed through dummy gate parts 6 at a plurality of places such as three places opposite to a product gate part 4 with the runner 3 between. As a result, the speed of the molten resin passing the product gate part 4 is slow at first and then becomes fast.
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