| 摘要 |
PURPOSE:To contrive quickening of injection operation by facilitating control of a flow speed of resin, by performing injection under a state where a mold is broken at the time of changes of the resin and a color of a hot runner. CONSTITUTION:Changes of resin and a color within a screw cylinder 3 are performed and a mold 5 is released by mold clamping equipment. The screw cylinder 3 is brought into contact with a right end part of a hot runner 6 of the mold 5 by moving the screw cylinder 3 in the direction of the mold 5 and the same is kept pressing by fixed force. The resin is plasticized by turning a screw 4 by a predetermined stroke. Establishment of the stroke can be performed by a limit switch or a potentiometer or an encoder or a timer. An injection stroke, that is, the screw 4 is moved forward at a high speed. In this instance, it may be good to perform program control of an injection speed to a screw position during an injection stroke so that pressure is applied to the resin by making a flow speed fast in a flow path on the inside of the hot runner where the resin is apt to stay. Plasticization is performed by turning the screw again after arrival of the screw 4 at an advance limit and the forgoing injection stroke is repeated. |
