The main product processed in the investigated dryer is
machine-cut parsley (Petroselinum crispum), with a cut length
to 3-5 cm. After air-separating the leaves from the stems, the
parsley is loaded to an average bulk height of 0.1 m. The dryer
is divided into three temperature zones. The product entering
the dryer is supplied with the hottest air (105 C). The air
temperatures are lowered in the second (95 C) and third
zones (80 C) to preserve product quality.