纺织英语第三版课文中文翻译.doc

Lesson Two Cotton Properties and Uses
A relatively high level of moisture absorption and good wicking properties help make cotton one of the fortable fibers. Because of the hydroxyl groups in the cellulose, cotton has a high attraction for water. As water enters the fiber, cotton swells and its cross section es more rounded. The high affinity for moisture and the ability to swell when wet allow cotton to absorb about one-fourth of its weight in water. This means that in hot weather perspiration from the body will be absorbed in cotton fabrics, transported along the yarns to the outer surface of the cloth and evaporated into the air. Thus, the body will be aided in maintaining its 。因为纤维素的羟基基团,使得棉花对水有很强的吸引力。当水进入纤维棉,棉开始膨胀,其截面变得更圆。这种高度的亲水性和潮湿时溶胀的性能使棉花可吸水达到其重量的1/4左右。这意味着,在炎热的天气里,身体的汗液会被棉织物吸收,沿着纱线输送到衣物外表面并蒸发到空气中。因此,这对维持体温有帮助。
Unfortunately, the hydrophilic nature of cotton makes it susceptible to water-borne stains. Water-soluble colorants such as those in coffee or grape juice will rate the fiber along with the water; when the water evaporates, the colorant is trapped in the fiber. Perhaps the major disadvantage to cotton goods is their tendency to wrinkle and the difficulty of removing wrinkles. The rigidity of cotton fiber reduces the ability of yarns to resist wrinkling. When the fibers are bent to a new configuration, the hydrogen bonds which hold the cellulose chains together are ruptured and the molecules slide in order to minimize the stress within the fiber. The hydrogen bonds reform in the new positions, so that when the crushing force is removed the fibers stay in the new positions. It is the rupture and reformation of the hydrogen bonds that helps to maintain wrinkles, so that cotton goods must be ,棉纤维的亲水性使得它容易受到水渍。如咖啡或葡萄汁的水溶性色素会随着水分渗入纤维;当水分蒸发后,着色剂会停留在纤维上。也许棉产品主要的缺点就是其会起皱以及难以抗皱。棉纤维的刚性使得纱线抗皱性能降低。当纤维弯曲成新的结构时,将纤维素链连结起来的氢键断裂,同时分子滑移以减少纤维中的应力。氢键在新的位置重键,因而挤压的外力去除,纤维停留在新的位置。正是氢键的断裂与重键使得织物保持褶皱,所以棉织物需要熨烫。
Cotton is