| 摘要 |
PROBLEM TO BE SOLVED: To provide a crimped yarn for obtaining an extra-fine deeply dyeable yarn which is excellent in deep dyeability and can express a deep hue and tailored appearance, and which can reveal a chamois-like texture (a soft and smooth touch, an elegant coat of fur, and a flexible texture) when subjected to raising processing.SOLUTION: A crimped yarn is obtained in such a way that a polyester conjugated undrawn yarn is subjected to heat shrinkage treatment under a tensile force of 0.05 cN/dtex or less, at a temperature of 140-160°C, and at an overfeed ratio of 0-30%, and then subjected to draw false-twisting treatment at a draw ratio of 1.15-1.4 times, at a false-twisting coefficient of 27,000-32,000, at a false-twisting temperature of 170-190°C, and under an untwisting tensile force strength represented by the following equation (i) of 0.2-0.5 cN/dtex. The crimped yarn is split by alkali reduction processing into an extra-fine deeply dyeable yarn having a single fiber fineness of 0.01-0.5 dtex. Untwisting tensile force strength (cN/dtex)=[Untwisting tensile force (cN)]/[Actual fineness (dtex) of the crimped yarn after the draw false-twisting treatment] (i).SELECTED DRAWING: Figure 1 |
