| 摘要 |
PROBLEM TO BE SOLVED: To obtain a combined filament yarn with a difference in shrinkage for forming a fabric excellent in process passableness in a high-order processing process, touch feeling and further lightweight properties and rich in surface change and to provide a method for producing the combined filament yarn. SOLUTION: This combined filament yarn with the difference in shrinkage comprises a low shrinkable yarn which is a special core-sheath conjugate yarn and a highly shrinkable yarn that is a polyester single yarn and the low shrinkable yarn has a partial hollow part formed by breaking a polymer arranged in the core part and further the following characteristics. The combined filament yarn with the difference in shrinkage has >=2.0% of U% unevenness of thickness in the fiber longitudinal direction. 4-10% shrinkage percentage in boiling water, <=0% dry heat shrinkage percentage after shrinking in boiling water, <=8% shrinkage percentage in boiling water + dry heat shrinkage percentage after shrinking in boiling water, 60-100% elongation and >=3.0% U%.
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