vrieco-nauta vacuum dryers were developed from the already successful conical screw mixer line. the superior mixing quality of the vrieco-nauta mixers is utilized to efficiently present fresh product to the heated surface......vrieco-nauta vacuum dryers were developed from the already successful conical screw mixer line. the superior mixing quality of the vrieco-nauta mixers is utilized to efficiently present fresh product to the heated surface area. heat is transferred into the product through a jacketed vessel wall causing solvents or moisture residues to evaporate. the entire vessel is run under vacuum to further aid in moisture removal by lowering the saturated vapor pressure.