Abstract:
Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D); (A) the intrinsic viscosity [IV] is 0.97 to 1.15; (B) the amorphous orientation function [fa] is not larger than 0.55; (C) the tenacity [T] (g/d), the shrinkage [ DELTA S] (%) as measured after standing in dry air at 150 DEG C for 30 minutes, the medium elongation [ME] (%) under a load of 4.5 g/d, and the dimensional stability index [Y] expressed by the formula: Y= ME + DELTA S + 1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e): and and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: [tenacity (g/d) at break] x 2ROOT elongation (%) at break, is 30 to 36.
Abstract:
In the process of drawing/heat treating synthetic fiber thread melted and spun via a plurality of godet rollers and subsequently winding the same, accumulation of extraneous matter on the surface of the godet rollers may be prevented by performing multistage drawing/heat treatment while reciprocating the thread in the direction of the axis of rotation of the godet roller using the godet rollers at least two of which have surfaces having the roughness of 0.5
Abstract:
Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D); (A) the intrinsic viscosity [IV] is 0.97 to 1.15; (B) the amorphous orientation function [fa] is not larger than 0.55; (C) the tenacity [T] (g/d), the shrinkage [ DELTA S] (%) as measured after standing in dry air at 150 DEG C for 30 minutes, the medium elongation [ME] (%) under a load of 4.5 g/d, and the dimensional stability index [Y] expressed by the formula: Y= ME + DELTA S + 1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e): and and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: [tenacity (g/d) at break] x 2ROOT elongation (%) at break, is 30 to 36.
Abstract:
POLYESTER FIBER FOR INDUSTRIAL USE AND PROCESS FOR PREPARATION THEREOF Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D); (A) the intrinsic viscosity ¢IV! is 0.97 to 1.15; (B) the amorphous orientation function ¢fa! is not larger than 0.55; (C) the tenacity ¢T! (g/d), the shrinkage ¢.DELTA.S! (%) as measured after standing in dry air at 150.degree.C for 30 minutes, the medium elongation ¢ME! (%) under a load of 4.5 g/d, and the dimensional stability index ¢y! expressed by the formula: Y= ME0-81 + .DELTA.S + 1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e): 0.33Y + 5.55 ? T ? 0.33Y + 6.50 (a), 8.0 ? T ? 9.5 (b), 8.5 ? Y ? 10.5 (c), 5 ? ME ? 10 (d), and 2 ? .DELTA.S ? 6 (e); and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: , is 30 to 36.
Abstract:
Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D); (A) the intrinsic viscosity [IV] is 0.97 to 1.15; (B) the amorphous orientation function [fa] is not larger than 0.55; (C) the tenacity [T] (g/d), the shrinkage [ DELTA S] (%) as measured after standing in dry air at 150 DEG C for 30 minutes, the medium elongation [ME] (%) under a load of 4.5 g/d, and the dimensional stability index [Y] expressed by the formula: Y= ME + DELTA S + 1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e): and and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: [tenacity (g/d) at break] x 2ROOT elongation (%) at break, is 30 to 36.
Abstract:
Melt-spun synthetic fiber yarns are stretched/heat treated via a plurality of godet rollers, and godet rollers that provide a surface roughness of 0.5