Patents Assigned to Komatsu Ltd. & Satoshi Fujimoto
  • Patent number: 6143226
    Abstract: The present invention is an injection compression molding method and apparatus therefor which are capable of using a simple structure for rapidly molding a multilayer molded product with high strength and high accuracy. A molding method for attaining such characteristics includes the steps of extending an injected molten resin (51) by compressing the same in metal molds (31, 32), opening the metal molds during or after the extending operation, injecting a surface layer material (60) into a cap (.delta.) occurring between the metal molds (31, 32) and the molded resin (51) when the molds are opened, closing the molds during or after the injecting of the surface layer material (60), and cooling the resin (51) and the surface layer material (60) in the closed metal molds (31, 32).
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: November 7, 2000
    Assignee: Komatsu Ltd. & Satoshi Fujimoto
    Inventors: Satoshi Fujimoto, Makoto Nogawa