Patent ID: 6866494

Claim:
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 ( 25 a , 25 b ) for co-extruding a first and second strip ( 19 , 16 ) respectively; said two channels ( 25 a , 25 b ) 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 ).