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首页> 外文期刊>The Journal of the Textile Institute. 1, Fibre Science and Textile Technology >Steam-induced circumferential superdrawing of hollow poly(ethylene terephthalate) fibres
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Steam-induced circumferential superdrawing of hollow poly(ethylene terephthalate) fibres

机译：蒸汽诱导中空聚对苯二甲酸乙二醇酯纤维的周向超拉伸

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摘要

Amorphous poly(ethylene terephthalate) (PET) can be stretched at low tension without causing observable crystallization above the glass transition temperature. The resulting increased length with no measurable change in orientation is called superdrawing. Circumferential superdrawing of hollow PET fibres in hot water has been demonstrated to increase the fibre voids. The internal pressure forcing the void to grow is due to a combination of temperature-induced air expansion and water permeation into the void. The use of steam to replace hot water in superdrawing offers many advantages, particularly in improved process operability. In the present work, experimental devices were fabricated and procedures to use steam in superdrawing of hollow PET fibres were developed. The tests included both batch processing and continuous processing. The presence of liquid water on the fibre surface was found to play an important role in steam superdrawing. Experimental results show that the void ratio of PET hollow fibres processed by steam superdrawing with prewetting is similar to that of fibres superdrawn in hot water. Steam superdrawing may be operated at higher pressures than with hot water, leading to even higher fibre void ratios.
机译：非晶态聚对苯二甲酸乙二醇酯（PET）可以在低张力下拉伸，而不会在玻璃化转变温度以上引起明显的结晶。长度增加而方向没有可测量的变化的结果称为超拉伸。已证明中空PET纤维在圆周上超拉伸会增加纤维空隙。迫使空隙增长的内部压力是由于温度引起的空气膨胀和水渗透到空隙中的结合。在超拉伸过程中使用蒸汽代替热水具有许多优点，特别是在提高过程可操作性方面。在目前的工作中，制造了实验装置，并开发了在中空PET纤维超拉伸中使用蒸汽的程序。测试包括批处理和连续处理。发现纤维表面上存在液态水在蒸汽超拉伸中起重要作用。实验结果表明，预浸湿蒸汽超拉伸加工的PET中空纤维的孔隙率与热水中超拉伸的相似。蒸汽超拉伸可以在比热水更高的压力下运行，从而导致更高的纤维空隙率。

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