[섬유] Circumferential Superdrawing of Hollow Poly(ethylene Terephthalate) Filaments 출판일 : 2004.04.01 저자 : Arun Pal Aneja 서지사항 : Textile Research Journal, Volume 74, Issue 4, 365 페이지 등록일 : 2012.02.13 I 조회수 : 71 작성자 : admin |
Amorphous poly(ethylene terephthalate) (PET) can be stretched at low tension without
causing any observable crystallization at temperatures above Tg. This resultant increased
length with no measurable change in orientation is called superdrawing. Superdrawing of
hollow PET fibers in the circumferential direction is demonstrated in a hot water bath
accompanied by increased fiber void, which is caused by a combination of air expansion
and water permeation. A three-parameter model defines the kinetics of the process. The
phenomenon is characterized by a rapid rise in the fiber void with a subsequent steady
state. The model parameters are obtained by a simple geometric technique. The initial fiber
characteristics and morphology determine the rate of void increase and the final fiber
geometry. Intrinsic fiber variability is reflected in the water permeability and energy of
activation. The model predicts the total residence time required in the water bath to obtain
maximum void size during the superdrawing process.
|