Within a profile line, the hot air channels are used to vulcanize sealing profiles of compact, microporous and mainly sulphur-cured rubber compounds with and without a metal carrier. The inner channel walls are made of well heat-conducting materials and high-quality insulated sheet metal covering. The transport of the profile is accomplished by smooth conveyor belts or appropriately shaped roller sections. The direct heating of the air blown through the channel is effected by compact electrical blower-heater combinations or optionally by an economical gas-burner system. The hot air flow with a variable temperature of up to 300 °C enables the heat to be optimally transferred at the profile surface and to accelerate the beginning vulcanization. The hot air channels are designed such that the condensation of gaseous compound ingredients is prevented even in case of smallest hot air quantities. An efficient energy utilization in the profile vulcanization is also an essential feature for the electrotechnical equipment of these hot air channels. The PLC controls all drives, the synchronous starting-up and shutting-down, regulates the hot air circuits and auxialiary units as well as the line speed and the setpoint presettings for the temperatures of the hot air zones. Apart from that, the PLC monitors the regulations and possible fault sources through PLC analysis. Measuring devices for monitoring of current consumption data are available on request.

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