| 摘要 |
PURPOSE:To obtain products free of air defects by removing gases to be generated in the transfer injection-vulcanization of a rubber material by a method in which an annular groove leading to a forced suction mechanism is formed in a specific position of a land portion, and a fine aperture is provided in a specific position of the land portion. CONSTITUTION:In molds for transfer molding, for example, an annular groove 27 is led through a suction groove hole 15 and a sub-suction through hole 15a, piercing through an upper mold 11 and an intermediate mold 21, to a land portion 19 at a 2-3mm. distance (alpha) from the periphery 7a of a cavity, and 0.2- 0.5mum aperture 19a is provided in the land portion between the annular groove 27 and the cacity 7 to obtain an objective mold. A rubber material 3 is packed into a pot 1, a movable board 15 is raised while removing air in the cavity 7 and the sprue 17 through the aperture 13 between the heat insulator plate 9 and the upper mold 11 and the suction through hole 15, and the rubber material 3 is packed into the cavity 7 and vulcanized. Gases being generated are removed by suction through the aperture 19a in the land portion the annular groove 27 sub-suction through hole 15a. |
