| 摘要 |
PURPOSE:To contrive to simultaneously mold a plurality of optical disc substrates and enhance mass-productivity by a method wherein an injection molder is equipped with a mold, in which a plurality of cavities for simultaneously molding the optical disc substrates are formed, and a plurality of nozzles, through which molten resin is fed in the mold. CONSTITUTION:The injection molding equipment concerned is equipped with a mold 12, in which a plurality of cavities 11 for simultaneously molding a plurality of optical disc substrates, and an injection molder 13 having a resin feeding mechanism part 19 for feeding molten resin in the mold 12. The mold 12 is equipped with sprue bushings 15 having sprues 14 opening to the centers of respective cavities 11. Punches 16, each of which bores a center hole in each optical disc substrate molded in each cavity 11, are provided opposite to the sprue bushings 15. The injection molder 13 has plurality of nozzles 17 corresponding to the respective cavities 11, which communicate with a resin feeding mechanism part 19 through respective branch runners 18. |
