| 摘要 |
PURPOSE:To obtain a complete molded product, by a method wherein when both a signal showing that injection hydraulic pressure has arrived at a predetermine value and a time-out signal have been sent to a sequence control, the injection hydraulic pressure is changed over to a dwell pressure from filling pressure. CONSTITUTION:A screw 1 moves forward at high speed through instructions for starting injection. As filling of resin into a mold is progressed and injection hydraulic pressure becomes a value Pc set up by a preset value 11 soon, a signal is sent out to a sequence control 13 from a comparator 12. At this time, as a timer 16 which has actuated through the starting of the injection is under counting, it does not happen that filling pressure is changed over to dwell pressure. When the screw 1 is changed over to low speed and time passes by, the timer 16 comes to time-out and a signal of the same is sent out to the controller 13. In addition to the above, when the screw 1 is moved forward, filling of resin is completed and the injection hydraulic pressure arrives at Pc, though the signal is sent out to the controller 13, as the timer signal which has been counted out is sent out in advance, the filling pressure is changed over to dwell pressure Ph. |
