Battery separator fabric and related method of manufacture
US4987024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jan 9, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/681
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A battery separator fabric comprising a nonwoven fibrous web of thermoplastic fibers having top and bottom surface fibers and inner fibers. The surfaces of the top and bottom surface fibers of the fibrous web are seared and fused together to form film-like surfaces having pores, while the surface fibers and inner fibers of the web remain substantially unaffected. Searing and fusing of the surface fibers are accomplished by simultaneously applying heat to the top and bottom surfaces of the fibrous web so as to sear the surfaces of the thermoplastic fibers, and pressure to insure that the seared fibers make contact with each other to secure themselves together. As the seared fibers make contact with each other, film-like surfaces are formed with pores being created in the surfaces. The pores are created because a majority of spaces remain between the surface fibers. In addition, the heat and pressure are controlled by varying the temperature and pressure so that the surface fibers and the inner fibers of the fibrous web are substantially unaffected. The unaffected top and bottom and inner fibers along the porous film-like surfaces, permit the fibrous web to substantially retain its o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.