| 摘要 |
PURPOSE:To shorten the period of time required for vulcanization and prevent rubber from aging by a method wherein a rubber material is degassed by a vacuum extruder, an extrudate of the degasses rubber is plasticized by an injection molding machine, then it is injected into a predetermined mold and is molded and vulcanized. CONSTITUTION:The rubber material W1 supplied into a hopper 11 of the vacuum extruder 2 is sufficiently kneaded by a heating cylinder 15 and a screw 13, then moisture and air are removed from the rubber material under a vacuum action as a vent port 14, and a tape W2 is formed. Then, the sufficiently degasses tape W2 is plasticized by sufficiently heating and kneading it with a heating cylinder 34 and a plugging screw 36 of the injection molding machine 4, and is directed into an injection chamber 48. Then, an injection plunger 44 is forcibly fed from an injection cylinder 42 of an injector 40 into the injection chamber 48, whereby the rubber material is injected via a nozzle 49 into a cavity 62 formed by the molds 52, 56 and is molded. The vulcanization is conducted by heating upper and lower hot plate 51, 53. |
