METODO ED APPARECCHIO PER PIEGARE E FORMARE GLI ELEMENTI DI UN NASTRO COSTITUENTE UNA CERNIERA LAMPO

摘要

An apparatus for folding the coupling elements of a slide fastener string includes a pair of electrodes connected to a source of high frequency electromagnetic energy and a series of guide sections. The string is drawn through the guides and the coupling elements are heated and softened by the electromagnetic field and folded by the guides.