| 摘要 |
<p>A continuous, high speed method for elasticizing articles such as disposable diapers, incontinent briefs, and the like by securing an elastically contractible element to a moving, interconnected web of said articles, said elastically contractible element causing the discrete articles cut from the web to shirr in a direction substantially perpendicular to the direction of web travel. Prior to application and securement, the web from which the elastically contractible elements are cut is laterally stretched while at an elevated temperature which is less than its crystalline melting temperature and allowed to cool to ambient temperature. This molecularly orients the elastomeric material and makes the web dimensionally heat unstable parallel to the direction of stretching. The elastically contractible element is cut from the web of the heat unstable elastomeric material so that the length of the element coincides with the width of the heat unstable web. The elastically contractible element is applied to the moving web of interconnected articles while in a substantially untensioned, molecularly oriented, dimensionally heat unstable condition. The elastically contractible element is so oriented when applied to the web of interconnected articles that the direction of lateral stretching applied to the elastomeric web to impart a dimensionally heat unstable condition is aligned substantially perpendicular to the direction of travel of the web of interconnected articles. The discrete articles cut from the web are thereafter subjected to an external stimulus, such as heat, to cause the elastically contractible element to shrink and become dimensionally heat stable and elastic in a direction parallel to its length, thereby imparting shirring in a direction substantially perpendicular to the direction of web travel.</p> |
