Controlled draft and efficiency filter element for smoking articles
US4961415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1987 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Jan 16, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/75
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Nonwoven web comprising thermoplastic meltblown fibers or filaments predominantly present as agglomerates or multiple fused fiber areas. Such agglomerates in the web act as columns and impart a desired degree of strength and resistance to compaction. In contrast to prior art webs where such agglomerates have been considered undesirable, the webs of the present invention find particular utility when formed into cylinders as filter plugs for smoking articles. In smoking articles of the invention, the filter plugs have a desired pressure drop while demonstrating an unexpected degree of firmness, all at an economically attractive cost. Preferred embodiments include those where the machine direction strength to cross machine direction grab tensile ratios in the range of from about 1:1 to 4:1 and the fibers or filaments are made from polypropylene. Other embodiments include webs and filter plugs containing additives distributed throughout the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.