Abstract: In the use of microwave energy to remove moisture from a moving web, such as that moisture contained within transverse glue lines between superimposed sheets of the web for the purpose of holding the sheets together, the web is passed through a serpentine wave guide having a number of serially connected sections spanning the path of travel of the web. The microwave energy takes the form of standing waves within the wave guide, and the peaks of such waves represent "hot spots" of energy concentrations at which points maximum molecular agitation of the moisture is obtained so as to likewise obtain maximum drying effect. If the standing waves are simply tuned until resonance occurs, there is a considerable likelihood that the wave peaks of one section of the wave guide may become lined up with those of the other wave guide sections, hence producing several distinct lines of energy concentrations along the path of web travel.