Method and device for producing a two-part tire layer

A device for producing a two-part layer (2) of a road vehicle tire (4), the device comprising:

• a preforming plate die (26), through which extends at least one pair (27) of tapered flow channels (25a, 25b) for co-extruding a first and second strip (19, 16) respectively;
• said two channels (25a, 25b) comprising respective offset, side by side inlets (28, 29), said inlets (28, 29) having respective superimposed adjacent lateral portions (30, 32);
• respective substantially coplanar outlets (33, 34), said outlets (33, 34) having respective adjacent lateral portions (35, 38) so formed and interconnected as to define, between said two strips (19, 16), an L-shaped joint (20);
• and
• wherein a lateral portion (21) of the second strip (16) has an edge (17) substantially contacting a lateral shoulder (22) of the first strip (19), and is superimposed on a thin annular appendix (23) projecting from the shoulder (22) of the first strip (19).

A road vehicle tire comprising:

• two sidewalls (3), each having an outer coating skim (2) defined by a co-extruded first later-wall strip (19) and second abrasion strip (16);
• said second strip (16) comprising a lateral portion (21) having a lateral edge (17);
• said first strip (19) having an annular lateral shoulder (22) and a thin annular appendix (23) projecting from the shoulder (22);
• and
• said two strips (19, 16) being connected to each other by an L-shaped joint (20) wherein said lateral edge (17) is positioned substantially contacting said lateral shoulder (22), and said lateral portion (21) of said second strip (16) is superimposed on said annular appendix (23).