The disclosure provides for handles configured to selectively engage with an article and methods for using such handles. The transport roller includes an opening in the region other than the medium supporting region in a seam formed by matching the pair of end surfaces with each other. The plant comprises heating means to heat, directly or indirectly, the stream of air saturated with humidity exiting from the unit for damping powders using humidity, before it enters into the processing unit using active carbons filtration. The processor determines a holding manner according to sensing signals of the at least one sensor and determines a display mode of the display screen according to the sensing value and the holding manner.