Method of reheating preforms for forming blow molded hot fillable containers

A method of reheating a polyester preform for blow molding, said method comprising the steps of heating said polyester preform in a quartz infrared heater oven to a generally customary temperature for blow molding wherein the temperature of an outside surface of the preform is materially higher than the temperature of an inside surface of a like portion of the preform, transferring the reheated preform to a radio frequency heater and further heating the preform wherein the inside surface of the preform is heated at a greater rate than the outside surface of the preform until the temperature of the inside of the preform at least approaches the temperature of the outside, then transferring the thus heated preform to a blow mold for blow molding with the temperature of both the inside surface and the outside surface of the preform being above the temperature wherein crystallization would occur if the preform were heated to such temperature utilizing either quartz infrared heating or radio frequency heating independently.