Abstract: A process and system for the recovery of desirable constituent materials from vehicle tire pieces through pyrolysis. The system includes a pyrolysis section that is divided into a plurality of individual heating zones. Each of the heating zones is heated to a distinct operating temperature that is independent from the operating temperature of the remaining heating zones. Vehicle tire pieces are fed into the infeed end of the pyrolysis section by a rotatable feed cylinder that includes a screw-like flight extending from the inner wall of the feed cylinder. As the feed cylinder rotates, the flight directs the supply of vehicle tire pieces into the infeed end of the pyrolysis section. The pyrolysis section includes a rotary kiln that is divided into the plurality of heating zones.

Abstract: A moldboard structure is movably attached to the lower side of a vehicle frame at its front end or at a midframe location, and extends downwardly toward the ground surface. The moldboard structure has a central point and two lateral extensions with a lower edge. The moldboard extends outwardly and rearwardly from the central point at a sweepback angle of between 10.degree. and 25.degree. and preferably about 17.degree. to the transverse axis. The moldboard extends transversely beyond the centerline of the tire of the immediately rearwardly positioned axle by a distance of at least about 0 to 9". A support affixes the moldboard structure to the frame.