| 摘要 |
PURPOSE: An opening/closing type nozzle gate having a heating device and a cooling device, and an opening/closing method thereof are provided to reduce reject rate and to improve productivity by quickly heating or cooling the nozzle gate and effectively controlling the injection condition of the nozzle gate. CONSTITUTION: A method for opening/closing a nozzle gate(7) having a heating device and a cooling device comprises the steps of: operating a heater(4) installed at a nozzle body, and heating a nozzle(1); operating the heating device(5) installed at a gate tip(8), and heating the gate tip; injecting resin; stopping the heating device, and cooling the gate tip; and operating the cooling device(6) installed at the gate tip, and cooling the gate tip quickly.
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