Patent ID: 8454340

Claim:
An apparatus for heat-treatment of a tubular preform, the apparatus comprising: an outer longitudinally oriented first electrical conductor having an at least partially open interior, the outer longitudinally oriented first electrical conductor having a first end and a second end opposite the first end, the outer surface of the outer longitudinally oriented first electrical conductor forming a mandrel surface for the tubular preform; an inner longitudinally oriented second electrical conductor disposed within the outer longitudinally oriented first electrical conductor, the inner longitudinally oriented second electrical conductor having a first end, and a second end opposite the first end, the first end of the outer longitudinally oriented first electrical conductor electrically connected to the first end of the inner longitudinally oriented second electrical conductor to form a series electrical resistance between the second ends of the inner and outer longitudinally oriented first and second electrical conductors; a rotational support structure for support the opposing ends of the combination of the outer and inner longitudinally oriented first and second electrical conductors; an electric power supply having a first and second power supply outputs, the first power supply output connected near to the second end of the outer longitudinally oriented first electrical conductor, and the second power supply output connected near to the second end of the inner longitudinally oriented second electrical conductor; and a rotational driver attached to either the outer or inner longitudinally oriented first or second electrical conductor.