Method of forming a corespun yarn for fire resistant safety appa

Details Method of forming a corespun yarn for fire resistant safety appa Method of forming a corespun yarn for fire resistant safety appa

1990-04-30

1991-07-23

Hail, III, Joseph J.

Textiles: spinning, twisting, and twining

Apparatus and processes

Covering or wrapping

57315, 57335, 57401, D01H 572, D02G 336

Patent

active

050332627

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.

REFERENCES:
patent: 4202382 (1980-05-01), Westhead
patent: 4249368 (1981-02-01), Fehrer
patent: 4274448 (1981-06-01), Westhead
patent: 4327545 (1982-05-01), Fehrer
patent: 4327779 (1982-05-01), Westhead
patent: 4334400 (1982-06-01), Fehrer
patent: 4711079 (1987-12-01), Newton et al.
patent: 4860530 (1989-08-01), Montgomery et al.

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