| 摘要 |
PURPOSE:To enable a molding cycle time to be shortened and an injection molding facility to be reduced in its size, hot waiting until a main-hopper becomes void and make a cleaning to a sub-hopper and also the time required in the cleaning to be reduced by half, by setting properly the timing of the cleaning for both hoppers in the case where only one sub-hopper is connected to the main-hopper. CONSTITUTION:During injection molding to supply an injection molding material from the main-hopper 4 to the injection cylinder 1 of an injection molding machine 3, the supply of an injection molding material to the sub-hopper 11 is stopped for changing material. When the injection molding material in the sub-hopper 11 is supplied to the main-hopper 4 and the sub-hopper 11 became void, the inner portion of the sub-hopper 11 is cleaned, at first, without stopping the injection molding, subsequently, the following injection molding material is supplied into the inner portion of the sub- hopper 11 and stocked therein. In the next place, as the main-hopper 4 is supplied with the injection molding material therein to the cylinder 1 and became void, the inner portion of the main-hopper 4 is cleaned, after that, the material changing is completed by supplying the following material stocked within the sub-hopper 11 to the inner portion of the main-hopper 4. |
