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Application of continuous zone-drawing/zone-annealing method to poly(ethylene terephthalate) fibers

✍ Scribed by Akihiro Suzuki; Yoshinori Sato; Toshio Kunugi

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
192 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

A continuous zone-drawing/zone-annealing method was applied to poly-(ethylene terephthalate) fibers in order to improve their mechanical properties. Apparatus used for this treatment was assembled in our laboratory. The continuous zonedrawing treatment was carried out at a drawing temperature of 103ЊC under an applied tension of 6.6 MPa to fully orient amorphous chains in the drawing direction without inducing thermal crystallization. The continuous zone-annealing treatment was carried out twice at an annealing temperature of 160ЊC under 102.2 MPa and at 183ЊC under 161.1 MPa to crystallize the highly oriented amorphous chains. The fiber was continuously drawn and annealed at a rate of 420 mm/min. The fiber obtained had a birefringence of 0.260, a degree of crystallinity of 55%, a tensile modulus of 18 GPa, and a storage modulus of 21 GPa at 25ЊC. Despite the large difference in the treating speed between the continuous zone-annealing and zone-annealing, their values are approximately equal to those of the zone-annealed PET fiber that was reported previously.

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