| 摘要 |
The corespun yarn (10) is formed on a friction spinning apparatus and comprises three components, including a core (11) of high temperature resistant fibers, a core wrapper (12) of low temperature resistant fibers surrounding and covering the core (11), and an outer sheath (13) of low temperature resistant fibers surrounding and covering the core wrapper (12) and the core (11). The high temperature resistant fibers of the core (11) 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 12 and the outer sheath 13 are either natural or synthetic fibers, such as cotton and polyester. When the corespun yarn 10 is knitted or woven into a fabric and subjected to a high temperature flame environment, the low temperature resistant fibers of the core wrapper 12 and the outer sheath 13 are charred but do not melt, drip or exhibit afterflame or afterglow, and the charred portion remains in position around the core 11 and maintains the same type of flexibility and integrity as the unburned fabric. |
