Patent ID: 9186818
Filing Date: 2015-11-17
Classification: B29B,B29C

Abstract:
1. A heating device for a preform made of thermoplastic material, comprising at least one thermal conditioning cavity having a longitudinal axis (Y) and adapted to contain, at least in part, a body of the preform, wherein there are provided two or more separate heating modules, each heating module having a respective through opening and a thickness in the direction of the longitudinal axis (Y), said two or more heating modules being arranged with respect to one another so that the respective through openings are reciprocally aligned along the longitudinal axis (Y) and together define the thermal conditioning cavity, wherein each heating module comprises a respective heater ring positioned inside the heating module, separate from each other and delimiting the respective through opening, a respective induction coil arranged externally around the heater ring, configured to induce, on the passage of current in it, a magnetic flux on the heater ring, so as to transmit a predetermined amount of heat by irradiation to a corresponding portion of the preform when the preform is inserted into the thermal conditioning cavity, and wherein there are provided means of electrical power supply, independent of each other, to independently supply the induction coils of said two or more heating modules so as to adjust the temperature of individual portions of the preform corresponding to the respective heater ring.