| 摘要 |
<p>A polytetramethylene terephthalate (PTT) pre-oriented yarn package which has 2 kg or more of PTT yarns laminated and satisfies the following requirements (1) to (3): the difference in diameter between the ear portion and central portion of the package is 0 to 5 mm, the difference in the stress of dry heat shrinkage between a yarn laminated at the ear portion and that laminated at the central portion is 0.01cN/dtex or less, and with respect to pre-oriented yarns dewound from the package, the value of variation of fineness (U %) is 1.5 % or less and the coefficient of variation for the period of variation of fineness is 0.4 % or less. The above PTT pre-oriented yarn package does not exhibit substantial difference in the thermal properties between its ear portion and central portion, and thus allows the production of fabric products for clothing which are made of PTT fibers, are free from periodical dyeing speck and have soft feeling.</p> |
