| 摘要 |
PURPOSE:To enable to cool a molded item in a short time and consequently to shorten its molding time by a method wherein the molded item is indirectly cooled by cooling water and at the same time directly cooled from the interior by the air flow passing from an air supply nozzle to an exhaust nozzle. CONSTITUTION:Cooling water is flowed in the respective circulating water passages in metal molds 1a and 1b. At the same time, the air in a molded part or a parison P is discharged from an exhaust nozzle 21 through an exhaust passage 20 and an exhaust pipe 22 and air is newly flowed from an air supply nozzle 16 by opening a second on-off valve 24 by means of a second solenoid 23 under the condition that a first on-off valve 19 is left open. The newly flowed air cools the molded item in a short time together with the metal mold cooling water flowing in the respective circulating water passages. After the air being flowed for a certain fixed period of time, both the on-off valves 19 and 24 are closed by means of both the solenoids 18 and 23 and slide members 7 and 8 are retreated by both air cylinders 11 and 12 in order to draw off both the nozzles 16 and 21 and finally the circulation of the cooling water is stopped after the solidification of the molded item. In such a manner as mentioned above, the molding time can be shortened. |
