Diaper with elastic margins
US4726807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Apr 10, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1737
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention is an elastic leg diaper and a method and equipment for its manufacture. A preferred form of the diaper uses for the entire moisture impermeable backing sheet an elastomeric material of the type that is heat unstable and relatively inelastic in its unshrunk form and stable and relatively elastic in its heat shrunk form. Numerous materials of this type are available. Included among them are block copolymers which include a rubbery material as one component, polyurethanes, and irradiated polyethylene. Diapers made using one of these materials as a backing sheet can be conventionally assembled. After assembly, the marginal areas, which may be either or both of the transverse and longitudinal margins, may be heated to a sufficient temperature for shrinkage to occur in the backing sheet. This shrinkage will only occur when the backing sheet is unrestrained. The method provides for the maintenance of longitudinal tension in the central portion of an end-to-end assembly of diaper units while relaxing the edge tension on the units. This is accomplished in the present diaper making machine by passing the assembly over a series of rollers which are of cylindrical form i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.