| 摘要 |
PURPOSE:To obtain a molded item, the fill for which is large and at the same time which has no internal strain, with a comparatively small-sized molder by a method wherein molten resin is filled in molds under the state that the movable mold is open to the fixed mold by compression allowance and, after that, the movable mold is advanced so as to bring the compression allowance to null. CONSTITUTION:A screw 12 sends molten material in a vacant part ahead the screw and at the same time retreats while rotating itself. After that, when a positional detector 22 detects the predetermined screw position, a signal T is issued so as to change over a solenoid selector valve 45 to the position B in order to block the return oil from an injection cylinder 13, resulting in keeping the screw 12 rotating at the position as it is, and applying material for the period of time set on a timer 34. After the set period of time, a solenoid selector valve 46 takes the position B, and the solenoid selector valve 46 is changed over to the position A so as to move the screw forwards in order to apply the material, which is stored ahead the screw, in a mold cavity 21 under high pressure. Further, when the screw position, which is set, for example, on a setting device 26 in the injection stroke, is reached, the compression by bringing compression allowance (delta) to null is done. |
