| 摘要 |
A synthetic polymer multifilament yarn capable of being converted to a bulky yarn is composed of a plurality of irregular individual filaments each having at least two belt-shaped filamentary constituents, at least one core filamentary constituent located between the belt-shaped constituents and extending in a sinuous manner and having a thickness varying alternately between thick and thin, and at least two thin middle filamentary constituents located between the core constituent and the belt-shaped constituents to thereby connect those constituents to each other. In each cross-sectional profile of the individual filaments, the core constituent has an inscribed circle having a diameter ( l B), the belt-shaped constituents have a substantially I-shaped cross-section, the middle constituents have a waist-formed cross-sectional profile having a narrowest portion thereof, and the diameter ( l B) is larger than diameters ( l C) of inscribed circles of cross-sectional regions each consisting of a cross-section of a belt-shaped constituent and a half portion of a waist-formed cross-section of a middle constituent located between the belt-shaped constituent and a line drawn along the narrowest portion of the middle constituent. |
