Method and apparatus for making disposable diaper

Abstract

The present invention aims to provide method and apparatus for making a disposable diaper improved so that a region of the continuous elastic predetermined to extend across the middle of the crotch region may be attached to continuous web in a desired condition. A method for making a disposable diaperincludes the steps of, (A) coating a first surfaceA of a first webwith an adhesiveto define an adhesion regionextending from first side edgetoward second side edgein a cross direction CD and a non-adhesion regionextending along the second side edgein a machine direction MD; (B) rocking the continuous elasticby a rocker armin the cross direction CD and thereby laying the continuous elasticon the first surfaceA of the first webin a curved pattern such that the continuous elasticmay have crest-segmentseach curving convexly toward the first side edge, trough-segmentseach defined between a pair of the adjacent crest-segmentsand curving concavely from the first side edgeand intermediate segmentsconnecting the crest-segmentsto the trough-segments; (C) attaching the continuous elasticincluding the trough-segmentsand the intermediate segmentsbut except the trough-segmentsto the first surfaceA of the first webin the adhesion regionsby a first pressure roll; and (D) putting flat and bonding together the first weband the second webby a second pressure roll