DEVICE FOR HEATING PLASTIC CONTAINERS AND RESONATOR THEREFOR

摘要

The invention relates to a device (1) for heating containers and in particular plastic preforms (10), comprising at least one microwave generator (2) that generates an alternating electromagnetic field in the form of microwaves, a microwave transmission unit (4) that transfers the microwaves generated by the microwave generator (2) to a resonator unit (6), and comprising a transport device that transports the plastic preforms (10) to the resonator unit (6), wherein the resonator unit (6) comprises a resonator housing (8) that forms a receptacle space (10) for heating the plastic preforms (10), said housing having at least one inner wall (22a, 22b, 22c) facing the plastic preforms (10) and an in-coupling area (12) through which the microwaves are introduced into the resonator unit (6), wherein the inner wall (22a, 22b, 22c) is annealed at the surface thereof facing the plastic preforms at least in sections such that the annealing reduces wall power losses in the inner wall caused by the microwaves.