METHOD AND APPARATUS FOR MOLDING RUBBER MOLDED PRODUCT

摘要

PURPOSE:To prevent such a phenomenon that the molding material charged in a cavity flows backward by thermal expansion to flow over a sprue hole. CONSTITUTION:One end surface 8b of a moving runner plate 8 is brought into contact with the outer end surface 2c of a clamped split mold 2 by an injection nozzle 7 to fill a cavity 5 with a molding material through a sprue hole 11, a runner 12 and an injection port 13. When the charge material is thermally expanded by vulcanization and the pressure applied to the moving runner plate 8 rises, the injection nozzle 7 is retracted to enable the linear movement of the moving runner plate 8 and the charged material flowing backward to the gap formed by the separation from the outer end surface by the pressure of the runner plate 8 is allowed to overflow.