合成繊維?再生繊維集合体の圧縮クリープ特性

摘要

In this study, compressive creep behaviors of staple fiber assemblies made of polyester fibers with heteromorphic section, round section and hollow section, PTT fibers and regenerated fibers such as cupra and lyocell fibers are investigated under two different stress conditions, and results are obtained as follows. (1) Creep deformation ratio of regenerated fiber assembly is larger than that of synthetic fiber assembly for each stress condition within the range of samples used here. (2) Creep deformation ratio of fiber assemblies that have same fineness and same fiber length is compared. For polyester fibers with heteromorphic and round sections, and cupra fiber, the order of magnitude is as follows; (cupra) > (round) > (heteromorphic). For polyester fibers with round and hollow sections, the order is (round) > (hollow). (3) Creep deformation ratio at high stress condition is twice as large as that of low stress condition for fine polyester fiber with hetermorphic section and thick polyester fiber with round and hollow sections. In contrast, creep deformation ratio at high stress is smaller than that of low stress condition for cupra and lyocell fibers with large length. (4) Compressive creep phenomena of staple fiber assembly is expressed by the creep equation derived from non-linear three element model as follows, ε_t =Y₀ ln(vt+1) where, Y₀ and v are constants determined by material properties, measurement condition and compressive stress. Y₀ value has good correlation with apparent Young′s modulus, number of crimp and crimp ratio, and v value has good correlation with bending rigidity of fiber.