| 摘要 |
A cavity of an injection mold has a ring shape in a plane view, and has a cross-sectional shape having an upper surface forming a design surface of an injection-molded product, both side surfaces continuing from the upper surface, and a bottom surface. When molten resin is injected from a side gate, flows in opposite directions are generated in the cavity and the molten resin meets at a position opposite the side gate in a diameter direction of the cavity, but at this position, the molten resin partly flows into resin reservoirs disposed on both sides. Consequently, since flows horizontal to the upper surface are generated, a luminous material in these flows is also oriented substantially in parallel to the design surface, which can alleviate the disorder of the orientation of the luminous material. |
