| 摘要 |
PURPOSE:To control molten resin temperature with good operability by a method wherein a nozzle valve is controlled by throttling in response to the change of the speed of a screw on the basis of obtained relative quantitative relationship among the heat quantity generated by shearing, the screw speed and the amount of throttling of the nozzle valve. CONSTITUTION:A command is issued from an injection speed setter 14 to a flow control valve 15, which is connected to an injection cylinder device 7, so as to realize its predetermined opening in order to perform an injection process by actuating a screw at the predetermined speeds V1, V2, V3...Vs. During said injection process, speed signals V1-Vs are sent from the injection speed setter 14 to a nozzle valve opening controlling device 13 so as to calculate the throttling area AN=f(Vn) of the nozzle valve 9 interms of the injection speed in order to issue a command to a nozzle valve driving device 12 to realize the amount of throttling in response to the value of AN. The function of f(Vn) is set so as to realize the desired heat generating quantity of resin. Thus, the controlling of the temperature of molten resin flowing in a mold cavity can be done with good operability.
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