| 摘要 |
<p>Optical disks, which require precision replication of the surfaces, are injection molded using molds (4 and 5) with inserts (6) that are heated by circulating heat transfer fluids. By initially heating the inserts (6) with a fluid supplied by a hot side reservoir (22) at a temperature above the melt solidifying temperature of the injected resin, the molding surfaces are heated to a temperature sufficiently high to retard solidification and premature viscoelastic skinning of the molten thermoplastic injected into the mold cavity (13). A cooling phase then occurs in which the molding surfaces are cooled with a fluid supplied by a cold side reservoir (32) at a temperature below the melt solidifying temperature of the resin. A fluid control unit (2) and a process control unit (3) are interconnected to govern the flow of heat transfer fluids into and out of the injection mold assembly (1).</p> |
