Latest non contact infra red drying system from Bekaert Solaronics is the UniDryer V2, for drying and profiling after size press and coating stations. Combining air flotation and gas IR technologies, it is said to provide the highest energy efficiency and longest emitter lifetime available.
Distributed in the UK by Jarshire, the system consists of air flotation nozzles, Gem IR emitters and integrated air fans. The high power emitters transfer the energy directly onto the web by infra red radiation while the air flotation nozzles, positioned in between each two-row burner, optimize evaporation with the integrated fans that directly re-blow the hot air back onto the web at up to 350degC at 50m/s. According to Bekaert Solaronics, this ensures a system efficiency of 68 per cent without the use of heat exchangers.
Developed specifically for the paper and board industry, the high power Gem emitters are said to allow the gel point to be reached as fast as possible, reducing migration and mottling. After the gel point, the drying rate can be further controlled by the selection and power level of each two-row burner. Coat temperature is controlled all along the drying web by the alternative use of air flotation and infra red, while integrating a profiling option into the system can also optimize the cross-direction moisture profile.
Even if differing amounts of coating are applied to each side of the paper, it is claimed, the Unidryer V2 system will “ensure perfect quality thanks to top-bottom drying flexibility”.
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