Back-to-back transition web and method of making said
US3952124A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1973 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/60
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for producing a multi-layer web, and the web produced thereby, are disclosed. The nonwoven web consists of two half-thickness portions laminated to each other. A first half-thickness portion is characterized by a given overall concentration of long and short fibers and has one face enriched in long fibers above the overall concentration and the other face enriched in short fibers above the overall concentration. The concentrations of long and short fibers decrease substantially uniformly from the enriched faces to form a transition region within the half-thickness portion. The second half-thickness portion is bonded to the short fiber-enriched face of the first half-thickness portion and has an outer face (opposite the bonded face) of substantial structural integrity as compared to the short length fiber-enriched face of the first half-thickness portion. In the preferred embodiment, the second half-thickness portion is similar to the first half-thickness portion and bonded in mirror image relationship thereto. The method produces two half-thickness portions which are bonded together to form a multi-layer web. A first half-thickness portion is produced by feeding long and s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.