| 摘要 |
PURPOSE:To contrive to shorten the time required for color change and to reduce the amount of rein consumed for color change by a method wherein the color change is performed at all times under the condition that a color change is done with the resin of high viscosity, and the scraping effect by the resin is large by feeding the object resin for color change to a screw little by little. CONSTITUTION:When color change command is issued from the main cycle of a controlling device 60, comparison is performed at the judging part of a color change completion detecting means 50. In the case that color change is not yet performed, the initial value issued from the color change completion detecting means 50 is zero and consequently 'NO' signal is outputted so as let a stock resin supply selecting means 21 stop the supply of stock. However, even after the stoppage of the supply of stock, injection cycle is continued until the hollow part in a cylinder reaches the predetermined length. The arrival of the length of the hollow part to the predetermined length is judged by a detecting means 30 of the starting of the supply of resin for color change so as to supply the first stock resin for color change by the specified amount and, after that, to repeat injection in order to discharge the resin in the cylinder. The arrival of the discharged amount it the specified supplied amount or not is judged with a detecting means 40 of the discharge of the specified fill so as to continue the discharge cycle until its condition is satisfied. Thus, the resin fill becomes minimum and consequently the color changing time is shortened.
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