Patent ID: 8016580

Claim:
An assembly for a tire component extruder, comprising: a splice bar designed for guiding and uniting a first stream of a first rubber compound and a second stream of a second rubber compound, the splice bar being an elongated element with a fastening and positioning block at each end, the cross section of the blocks is trapezoid, each block has a bottom surface, a front surface, a top surface and a rear surface, the cross section of a guiding section of the bar is triangular having base surface C designed to guide a first stream of rubber and cap surface D designed to guide a second stream of rubber, the rear surface of the guiding section is in the same plane as the rear surface of the blocks, this surface is designed to come in contact with a corresponding surface of an extruder able to produce two distinct streams of rubbeR, the cap and base surfaces of the guiding section of the splice bar intersect downstream in order to bring together and unite the two separate streams of rubber; a die to be positioned downstream of the splice bar, the die comprising a shaped opening through which the united streams of the first and second compounds are extruded for forming the tire component; an auxiliary channel in communication with the second stream of the second rubber compound and with a feeding end between the splice bar and the die at the vicinity of the united first and second streams of rubber compounds at the first stream side in order to feed the united streams at a side opposite to the second stream with an auxiliary stream of the second compound before extrusion through the die; a holder shaped as a rectangular plate with an opening, the opening being shaped for receiving the splice bar, the bottom surfaces and top surfaces of the blocks come in thrust engagement with corresponding surfaces of the opening; and wherein the die element is generally shaped as a plate comprising a shaped opening through which the tire component is extruded, the holder and the die element being designed to come into engagement when assembled, when the splice bar, the holder and the die element, are assembled together, the front surfaces of each block of the splice bar are in contact with a rear surface of the die.