Abstract
Hot-air vulcanisation is one of the oldest pressureless continuous vulcanisation processes. The transfer of heat to the extrudate which is needed for vulcanisation is achieved by means of hot air. Apart from the air temperature, other factors having a significant effect on the temperature profile within the extrudate include flow velocity and turbulence. One indicator of the efficiency of energy input is the heat transfer coefficient of the air as a function of the flow pattern (laminar or turbulent), flow velocity, temperature and geometry of the channel through which the air flows. The effects of operational parameters on the heat transfer coefficient in hot-air vulcanisation are presented and discussed.
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