Method of forming a corespun yarn for fire resistant safety apparel
US5033262A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1990 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Apr 30, 2010 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD10B2331/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The corespun yarn is formed on a friction spinning apparatus and comprises three components, including a core of high temperature resistant fibers, a core wrapper of low temperature resistant fibers surrounding and covering the core, and an outer sheath of low temperature resistant fibers surrounding and covering the core wrapper and the core. The high temperature resistant fibers of the core are selected from the group consisting essentially of aramid fibers (Kevlar and Nomex), and polybenzimidazole fibers (PBI). The low temperature resistant fibers of the core wrapper and the outer sheath are either natural or synthetic fibers, such a cotton and polyester. The corespun yarn is knitted or woven into a fabric and subjected to a high temperature flame environment, the low temperature resistant fibers of the core wrapper and the outer sheath are charred but do not melt, drip or exhibit afterflame or afterglow, and the charred portion remains in position around the core and maintains the same type of flexibility and integrity as the unburned fabric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.