| 摘要 |
PURPOSE:To produce the titled conjugated yarn showing steric crimp and ther mally bonding properties by heat treatment, consisting of sheath-core structure yarn wherein the core part has two specific components arranged in parallel, the sheath part has a lower melting point than any of the core part and the yarn is aggregated in a node state. CONSTITUTION:In conjugated yarn consisting of a core part 1 and a sheath part 2, two polypropylene polymers are arranged in parallel in the core part 1, the conjugation ratio of the two polymers is 1:2-2:1, Q value (weight-average molecular weight/number-average molecular weight) of one core component 1a is >=6 and Q value of the other component 1b is <=5. The ratio of the sheath part 2 converting the core part 1 is 25-55wt% based on total amounts of the conjugated yarn. The sheath part 2 consists of a polyethylene polymer having a melting point >=20 deg.C lower than that of any of the core components. The conjugated yarn is heat treated at a temperature lower than the melting point of the core components and higher than the melting point of the sheath part to form aggregated parts 3 consisting of the sheath component at a great num ber of sheath parts. |
