| 摘要 |
PROBLEM TO BE SOLVED: To produce a mottled yarn having a natural and good appearance, touch and visual feelings, color tone, etc., by drawing and carrying out the weight reduction treatment of a conjugated fiber which is the one, comprising two kinds of polyesters having different weight reduction rates with an alkali as filaments and having a random conjugated form under specific conditions. SOLUTION: This polyester-based multifilament mottled yarn has the following characteristics (a) to (d): (a) The respective filaments constituting the yarn are different in cross-sectional shape and cross-sectional area, randomly have thick and thin parts in the longitudinal direction of the fibers at 2-6 cross-sectional area ratio of the thick to the thin parts; (b) the yarn is composed of s least one kind of polyester filament; (c) the yarn has 3-20% U% and the thin parts at a ratio account for 50-100% of the cross section of the yarn and (d) >=50% strength retention ratio before and after the weight reduction treatment with the alkali under conditions of 40g/L concentration of sodium hydroxide, 95 deg.C and 20% weight reduction ratio. |
