SINGLE CAVITY HIGH-TEMPERATURE RUNNER INJECTION MOLDING DEVICE

摘要

PURPOSE: To operate a nozzle between an open position wherein the opening and closing of a valve is drawn in and a front closed position by simple constitution by providing an operation mechanism driven longitudinally between the open position where the nozzle is drawn in and the front closed position where the tip of the nose part of the nozzle is seated on a gate. CONSTITUTION: When a cavity is filled, injection pressure is instantaneously applied and air pressure is subsequently applied to a piston to rotate an outside collar 82 and a nozzle 10 is driven to a front closed position and a tip 20 is seated on a gate 22. During a short cooling period, injection pressure is released and a mold is opened along a separation line 110 in order to discharge injection pressure usually. When the mold is closed after discharge, the air pressure of the piston is changed over to draw the nozzle 10 to a drawn-in open position. The injection pressure of a melt is again applied by a mold machine and this cycle is repeated every min continuously and the pressure of the melt and air pressure to the piston 98 are controlled so as to operate a system according to this constant cycle.