| 摘要 |
PURPOSE:To prevent the internal strain from generating by a method wherein the forward action for compression of a movable mold is started when a screw during its injection and filling reaches an arbitrary set predetermined position in its injection stroke. CONSTITUTION:In an injection compression molder 1, a screw 2 can axially move back and forth by an injection cylinder 3, and at the same time is installed to a heating cylinder 5 so as to be rotated by a hydraulic motor 4. A movable mold 6 mounted on a movable plater 7 is moved back and forth by a mold clamping cylinder 8 so as to form a molding cavity 11 by engaging with a fixed mold 10. In molding operation, a mold closing is done leaving compression allowance (delta) unclosed in advance, and molten resin is filled in the cavity 11. During filling, when the screw 2 reaches a screw position set by a setter 15, for example, a solenoid relief valve 31 is controlled by the pressure set on a pressure setter 27 so as to change over a solenoid selector valve 30 to the position B in order to perform the compression by the movable mold 6 with the mold clamping cylinder 9. Accordingly, compression action is applied to the molten resin filled in the molds before it is cooled and set, resulting in preventing the internal strain form generating. |
