A method for injection molding and curing a rubber article having a long, non-rigid insert

摘要

Process for molding rubber objects, especially electric insulators with internal inserts of heterogenous pieces, including oblong and non-rigid kinds, by means of a die composed of two half dies (11), (12) and an intermediate core, the two half dies (11), (12) having chambers whose shape respectively corresponds to that of the two parts (30), (31) composing the object to be produced, the core having reliefs, coinciding with said chambers, of shape and size corresponding to those of the inserts (56), on completion of molding the two half dies (11), (12) being separated and the intermediate core being extracted, leaving in their relative chambers the two parts (30), (31) of the object, the insert (56) being then placed in the cavity (53) made for it in one (31) of the molded parts of the object produced by one of the reliefs of the core, after placing of said insert the mold (10) being once more closed matching together the two molded parts (30), (31) with the insert (56) between them, union of the two parts (30), (31) of the object being then secured by means of vulcanization, the insert (56) being enclosed inside them.