| 摘要 |
The invention relates to an apparatus for injection molding the shells of a mini-disk cartridge or the like. More particularly, the device includes a main cavity having a shape of mini-disk shell. The mold contains various projections and indentations on the first and second surfaces, respectively, which are adapted to form a shutter recess near a first edge of the lower shell, a read/write port for a media disk in a vicinity of the first edge within the shutter recess, a shutter guide track on the outer surface of the lower shell close to and parallel to the first edge, a drive port for rotating a media disk, and various fastening bosses for fastening the upper and lower shells of the mini-disk cartridge together. A single hot-runner valve gate is placed in the mold close to one corner such that small cavities within the cavity are filled with polymer melt first. This valve gate position assures that the mold is completely and rapidly filled to facilitate even heat transfer from the polymer melt so as to prevent warpage of the lower shell after removal from the molds.
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