Apparatus and method for forming an elasticized portion of an article having a thermally-elasticizable strip along a marginal portion in which heated air is directed towards the strip at at least two different angles relative to the plane of the strip and at a velocity sufficient to cause oscillation...http://www.google.es/patents/US4663106?utm_source=gb-gplus-sharePatente US4663106 - Formation of elasticized portions of disposable garments and other articles
Formation of elasticized portions of disposable garments and other articles
