Abstract: Apparatus for the dry cross linking of strands of elastomer, in particular in the production of elastic cables and multilayered profiles comprises a string of tubes through which the strand passes. Between adjacent tube sections, there are hollow bodies having central cavities in line with the bore of the tubes and a plurality of branch cavities radiating from the central cavity. One of the branch cavities is connected through a UHF transformer and a wave guide with the UHF generator while tuning probes are arranged in other branch cavities. The UHF transformer has an inwardly diverging tapered opening in which a tapered plug of ceramic or plastic is fitted to provide a pressure seal. The interior of the tube sections and the hollow bodies is supplied with inert gas under pressure.

Abstract: Apparatus for heating continuous sponge rubber products by UHF energy to vulcanize them comprises a UHF generator connected to a resonator chamber through which the product passes by a wave guide which divides into two branches connected with the resonator chamber at spaced points. Each branch of the wave guide is tunable by a separate tuning device one of which is operable manually and the other is operated by a motor controlled by sensing probe in a circulator in the wave guide between the UHF generator and the branches. Uniform heating of the product is thereby obtained.