A tire, and an apparatus and method for forming a tire. The tire may either be
a tubed or tubeless tire, and is filled with a mixture of virgin rubber and small
rubber pieces. Preferably, a machine grinds the core of used flatproofed tires,
or pieces thereof, into a finely communicated pulverulent. The pulverent is mixed
with liquid virgin flatproofing material, such as a polyurethane. An injector introduces
this mixture, into the core of a tire, typically through a valve. The core of the
tire is preferably substantially filled with this mixture. The injector may take
the form of one or more elongated screws and the mixing may occur as the ground
rubber is being conveyed by the screw.
