The soluble components of coffee are extracted from the ground coffee, whose grind (approx. 2 mm) is not comparable with that used in commercially available coffee machines, in an extraction plant. Such an extraction plant works with water temperatures of up to 200 °C, for which a pressure of up to 20 bar is required so that the water does not evaporate. The ground coffee is placed in so-called percolators through which the hot water flows, dissolving out the soluble components of the coffee. The coffee extract thus obtained is concentrated in an evaporation plant and then dried.
