The glass plates to be coated are conveyed underneath a hopper filled with the adsorbent suspension. The layer thick- ness is determined by either a fixed gate with pre-set spacers or by a gate with adjustable distance.

The plates are moved by a motorized conveying system at a unitform feeding rate of 10 cm/s, to ensure a unirfrm layer.The Automatic TLC Plate Coater is supplied with a fixed gate for pre-set layers of 300 and 500 microns, an adjustable gate for layer thicnesses 0-2mm, and one plate holder for eight 20 x 20 cm plates.