Patent ID: 6733704
Filing Date: 2004-05-11
Classification: B29C

Abstract:
A method of using a thermoplastic resin injection molding machine having a plasticating unit for plasticating a thermoplastic resin, and an injecting unit connected to the plasticating unit through a connecting passage to inject the plasticated resin into a mold through an injection port, the injecting unit including a rotary pump having a suction side connected to the plasticating unit through the connecting passage and a discharge side connected to the injection port, the method comprising the steps of:plasticating resin with the plasticating unit; flowing the plasticated resin through the connecting passage to the injecting unit; intermittently injecting the plasticated resin through the injection port by the rotary pump; and limiting the torque by a torque limiter provided on a driving shift for driving the rotary pump to provide a slide when the torque exceeds a predetermined value, whereby injection pressure is prevented from decreasing.