The cell load weighed approximately 125 g and the process
started at a product temperature of 20 C. Throughout the drying
period, the vacuum was set to 20 hPa. The drying started after
starting the magnetrons at a vacuum level of 100 hPa. The microwave
power entry was set to 500 W for 25 min (period 1). In
addition, a microwave stop time of 5 min and a short power-on
time of 60 s with an energy entry of 1000 W were programmed
(period 2). To reduce high temperature peaks the energy intakewas
set to 80 W until the end of drying (period 3 and 4). The drying
conditions were normally held constant during each experiment
(n ¼ 8).