Wool/para-aramid fibres blended in spun yarns as heat and fire resistant fabrics

摘要

Knitted textiles, obtained with yarn-by-yarn blending of wool and poly-p-phenylenediamine-terephthalamide (PPTA) high perfor- mance fibres, allow improved fire retardance performance and thermal stability by snergistic effects. Blends of wool with PPTA fibres in spun yarns (intimate mixing) are studied in order to investigated better synergistic effects due to the intimate contact between fibres. Those yearsn, made and knitted in our laboratory, give exceptional results according to RHR (rate of heat release) peak and thermal sta- bility. A mechanism of action explaining the enhanced performance is proposed.