| 摘要 |
PURPOSE:To enable the welded state of a molded object to be made uniform, while its heating time is shortened since stocks are directly heated by injecting steam into a mold. CONSTITUTION:After the finish of filling, air is caused to flow in an air-flowing path 24, and a movable cover 20 is advanced, thereby closing a stock-feeding port 14. A mold is fully closed with pressurizing, and movable walls 17 are advanced by operating cylinders 18, and then the stock 25 is heated by the stem injected from steam ports 16. The temperature of the steam is set at least at the softening temperature and at most at thermal decomposition temperature of the globular stock as raw material. The heating temperature thereof may be optionally set by controlling steam pressure. Its heating is carried out for tens of seconds per square centimeter to several tons per square centimeter. After the finish of heating, e.g. water is sprayed on the mold and a molded object, and the molded object is cooled to the temperature at which the molded object does not deform, and then, the molded object is taken out from the mold. |
