MULTI-LINE GLUING OF SUPERIMPOSED LEAVES

摘要

A series of spaced, transverse glue lines and/or one or more longitudinal glue lines, used to join certain of the face-to-face sheets of a continuous web along either or both of its marginal edges, are dried simultaneously, regardless of the width of the web or the spacing between its glue lines, by evaporation of the moisture content of the glue as the web is advanced. Heat energy is applied to the glue lines through use of wave guides that conduct electrical energy in the microwave region, and the amount of heat energy so applied is controlled in accordance with the number of glue lines being dried.