LENS INJECTION-COMPRESSION-MOLDING METHOD

摘要

In an injection step, actual injection speed V is closed-controlled so that the actual injection speed V becomes equal to first or second preset speed V1 or V2 while comparing the actual injection speed V with the first o r second preset speed V1 or V2 in the section between S0 and S1 from the time when injection of molten resin is started up to the time when the molten res in reaches this side of a gate portion 46 or the section between S1 and S2 from the time when the molten resin reaches this side of the gate portion 46 up to th e time when the molten resin reaches the inside of a cavity 3. The injection speed V is open- controlled to third preset speed V3 in the section between S2 and S3 from the time when the molten resin reaches the inside of the cavity 3 up to the time when injection of the molten resin is completed. Because a high injection speed can be secured and an injection speed change can be decreased, it is possible to decrease the frequency of a feed history appearing on the surface of a molded product.