High-strength glass fiber mat particularly useful for roofing products
US4242404A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | May 16, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/691
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
What is provided herein is a glass fiber mat having a novel structure and high-strength properties which is particularly useful for roofing products, including built up roofing membranes and systems. The glass mat of the invention is comprised of two fibrous components, namely, individual filament glass fibers and extended glass fiber elements, which are formed in situ in a wet-laid process from original bundles of glass fibers. The individual filaments appear by conventional filamentation of the bundles. The extended fiber elements, however, are formed by longitudinal extension of a given bundle whose fibers are connected longitudinally. Thereby the effective length of a fiber element is very much greater than the length of the fibers therein. The fiber elements are further characterized by a non-uniform diameter, as contrasted to the fibers themselves, being thicker in the mid-section of the element where connection of fibers is maximized, and tapered towards its ends, where fiber connection is at a minimum. The extended fiber elements preferably predominate by weight of the fibrous content of the mat over the individual filaments. The desired ratio of the two components is achie…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.