| 摘要 |
<p>A polyester composite fiber pirn formed by winding into a pirn shape composite fibers that consist of single yarns each formed by pasting two types of polyester components in a side-by-side fashion or an eccentric sheath-core fashion, at least 90 mol.% of at least one type of polyester component constituting the single yarn being polytrimethylene terephthalate consisting of the repeating units of trimethylene terphthalate, characterized in that the wound amount of the composite fiber pirn is at least 1 kg, a tapering winding angle is 15-21 degrees, a winging hardness at a cylindrical portion is 75-92, and the heat-shrinkage stress expression initiating temperature of the composite fiber is 50-80.</p> |
