Method for co-extruding complex rubber profile for manufacturing a tire

A method for the co-extrusion of a complex rubber profiled element for manufacturing of a tire, the complex profiled element comprising, in its height, (1) as a first layer, a sublayer of a first rubbery material, and (2) as a second layer, a tread of a second rubbery material superimposed on the sublayer, wherein each of the tread and the sublayer have at least one discontinuity in the width of the complex rubber profiled element that extends in a transverse direction so that at least one insert of a third rubbery material is inserted in the at least one discontinuity of the tread and of the sublayer during co-extrusion, the method being a method of extruding and profiling the first, second, and third rubbery materials of the complex rubber profiled element over a given co-extrusion width and in a longitudinal direction of co-extrusion perpendicular to the transverse plane of the complex rubber profiled element, the method comprising the following steps:

• (a) extruding the first rubbery material, the extruding being performed discontinuously across the co-extrusion width;
• (b) first profiling of the first rubbery material, the first profiling being performed discontinuously across the co-extrusion width;
• (c) extruding the second rubbery material, the extruding being performed discontinuously across the co-extrusion width and being performed in such a way as to superpose the second rubbery material on the first rubbery material;
• (d) profiling of the first and second rubbery materials, the profiling being performed discontinuously across the co-extrusion width and being performed jointly with an extrusion of the third rubbery material into each of the at least one discontinuity of the first rubbery material and of the second rubbery material;
• and
• (e) final profiling of the first, second, and third rubbery materials according to a final profile exhibiting no discontinuity across the co-extrusion width while creating a longitudinal groove in the profiled complex rubber element, the longitudinal groove being situated transversely next to each insert originating from an extrusion of the third rubbery material in step (d).