In 1976, Crown became the first and only United States company to obtain a license from Heinz Schumacher for the Desolventizer-Toaster-Dryer-Cooler (DTDC). Crown has continually modified and improved the design, offering the most efficient DTDC built. Today, it is known as the Crown/Schumacher design.
After all the oil has been removed from the oilseed flakes or cake, they leave the Crown Extractor with approximately 30% solvent (hexane) content. The Crown/Schumacher Desolventizer-Toaster (DT) is the newest innovation in removing the hexane from the flakes and completing the toasting operation.
From the DT, the flakes are either conveyed to a Dryer-Cooler (DC) or, in the case of a Crown DTDC, they pass through the rotary valve, directly into the drying section of the DC. The drying and cooling are accomplished by blowing heated air in the drying section (dryer trays) and using ambient air to cool the meal in the cooling section (cooling tray).