METHOD FOR PLACING AN ELASTOMER ENVELOPE AROUND AN ELONGATED BODY

摘要

The compression moulding method consists in the following: two blanks are produced, whereby the shape thereof corresponds to the distribution of the material used for the envelope around the body; one of said blanks is positioned in the impression (14) of a lower moulding unit (11), said impression corresponding to the shape which is to be conferred upon the envelope; a plate or intermediate grid (19) defining the volume of the outer shaped of the body or part thereof on two main surfaces is positioned above the lower moulding unit which is provided with a blank; the second blank is placed on the upper surface of the grid in the voluminous area or the projection; the mould is closed, the upper unit thereof being also provided with an impression (16), during a sufficient length of time in order to produce two half shells which make up the final outer envelope for said body; the mould is opened and the plate or intermediate grid is removed; the body is placed at lower impression level, said lower impression being provided with the lower half shell, acting as a centering member for the body; the mould is closed for a sufficient period of time to allow cross-linking or vulcanization of the envelope and, consequently, at the junction of the half shells produced during the previous closing of the mould in order to create a continuous envelope: the mould is opened at the end of the cross-linking or vulcanization process, whereupon the body is removed and provided either fully or in part with the outer envelope (5).