加捻性质的指标有：表示加捻程度的捻度、捻系数及表示加捻方向的捻向。

　　The indicators of twisting properties include: twist degree, twist coefficient, and twist direction.

　　捻度纱丝加捻角扭转一圈为一个捻回。纱线单位长度内的捻回数称捻度。我国棉型纱线采用特数制捻度，即用10cm纱线长度内的捻回数表示；精梳毛纱和化纤长丝则采用公制支数制捻度，即以每米内的捻回数表示；此外，还有以每英寸内捻回数表示的英制支数制捻度。

Twist the yarn with a twist angle and twist it back one circle. The number of twists per unit length of yarn is called twist. Our country's cotton yarn adopts a special twist system, which is represented by the number of twists within a 10cm yarn length; Combed wool yarn and synthetic filament are twisted using the metric count system, which is expressed as the number of twists per meter; In addition, there is an imperial count system of twist expressed in revolutions per inch.

　 　捻系数捻度不能用来比较不同粗细纱线的加捻程度，因为相同捻度，粗的纱条其纤维的倾斜程度大于细的纱条。在实际生产中，常用捻系数来表示纱线的加捻程 度。捻系数是结合线密度表示纱线加捻程度的相对数值，可用于比较不同粗细纱线的加捻程度。捻系数可根据纱线的捻度和纱线的线密度计算而得到的。

　　The twist coefficient and twist cannot be used to compare the degree of twisting of yarns of different thicknesses, because for the same twist, the fiber inclination of coarse yarns is greater than that of fine yarns. In actual production, the twist coefficient is commonly used to indicate the degree of twisting of the yarn. The twist coefficient is a relative value that represents the degree of twisting of yarns based on linear density, and can be used to compare the degree of twisting of yarns of different thicknesses. The twist coefficient can be calculated based on the twist of the yarn and the linear density of the yarn.

　 　捻向捻向是指纱线加捻后，单纱中的纤维或股线中单纱呈现的倾斜方向。它分Z捻和S捻两种。加捻后，纱丝的捻向从右下角倾向左上角，倾斜方向与“S”的中 部相一致的称S捻或顺手捻；纱线的捻向从左下角倾向右上角，倾斜方向与“Z”的中部相一致的称Z捻或反手捻。一般单纱常采用Z捻，股线采用S捻。

　　Twist direction refers to the inclination direction of the fibers or strands in a single yarn after twisting. It is divided into two types: Z-twist and S-twist. After twisting, the twisting direction of the yarn tends from the bottom right corner to the top left corner, and the tilting direction is consistent with the middle of "S", which is called S twisting or smooth twisting; The twisting direction of the yarn tends from the bottom left corner to the top right corner, and the tilting direction is consistent with the middle of "Z", which is called Z-twisting or backhand twisting. Generally, single yarn is often twisted in Z, while ply yarn is twisted in S.

　　股线的捻向按先后加捻的捻向来表示。例如，单纱为Z捻、初捻为S捻、复捻为Z捻的股线，其捻向以ZSZ表示。

　　The twisting direction of the strand is represented by the twisting direction in which it is twisted in sequence. For example, for single yarn with Z-twist, initial twist with S-twist, and double twist with Z-twist, the twist direction is represented by ZSZ.

　　纱线的捻向对织物的外观和手感影响很大，利用经纬纱的捻向与织物组织相配合，可织出外观、手感等风格各异的织物。

　　The twist direction of yarns has a significant impact on the appearance and feel of fabrics. By combining the twist direction of warp and weft yarns with the fabric structure, fabrics with different styles in appearance and feel can be woven.

　　吸湿性能纺织纤维放在空气中，会不断地和空气进行水汽的交换，即纺织纤维不断地吸收空气中的水汽，同时也不断地向空气中放出水汽。纺织纤维在中吸收或放出水汽的性能称为纤维的吸湿性。

　　Moisture absorption performance: When textile fibers are placed in the air, they continuously exchange water vapor with the air. That is, textile fibers continuously absorb water vapor from the air and also continuously release water vapor into the air. The ability of textile fibers to absorb or release water vapor is called their hygroscopicity.

　 　纺织纤维的吸湿性是纺织纤维的重要物理性能之一。纺织纤维吸湿性的大小对纺织纤维的形态尺寸、重量、物理机械性能都有一定的影响，从而也影响其加工和使 用性能。纺织纤维吸湿能力的大小还直接影响服用织物的穿着舒适程度。吸湿能力大的纤维易吸收人体排出的汗液，调节体温，解除湿闷感，从而使人感到舒适。所 以在商业贸易、纤维性能测试、纺织加工及纺织品的选择中都要注意纤维的吸湿性能。

　　The moisture absorption of textile fibers is one of the important physical properties of textile fibers. The moisture absorption of textile fibers has a certain impact on their shape, size, weight, and physical and mechanical properties, which also affects their processing and usage performance. The moisture absorption capacity of textile fibers also directly affects the comfort of wearing fabrics. Fibers with high moisture absorption ability are easy to absorb sweat excreted by the human body, regulate body temperature, relieve stuffiness, and make people feel comfortable. So in commercial trade, fiber performance testing, textile processing, and textile selection, attention should be paid to the moisture absorption performance of fibers.

 　　在常见的纺织纤维中，羊毛、麻、粘胶纤维、蚕丝、棉 花等吸湿能力较强，合成纤维的吸湿能力普遍较差，其中维纶和锦纶的吸湿能力稍好，腈纶差些，涤纶更差，丙纶和氯纶则几乎不吸湿。目前，常将吸湿能力差的合 成纤维与吸湿能力较强的天然纤维或粘胶纤维混纺，以改善织品的吸湿能力。

　　Among common textile fibers, wool, linen, viscose fibers, silk, cotton, etc. have strong moisture absorption ability, while synthetic fibers generally have poor moisture absorption ability. Among them, vinylon and nylon have slightly better moisture absorption ability, acrylic has poorer moisture absorption ability, polyester has worse moisture absorption ability, and polypropylene and chlorinated fiber have almost no moisture absorption ability. At present, synthetic fibers with poor moisture absorption ability are often blended with natural fibers or viscose fibers with strong moisture absorption ability to improve the moisture absorption ability of fabrics.

　　在纤维的吸湿性能中，除吸湿性外，纤维材料的吸水性也与服用织 物的穿着舒适性密切相关。纤维的吸水性是指纤维吸着液体水的性能。人们在活动时所产生的水汽和汗水，主要**材料的吸湿和吸水性能，进行吸收并向外发散， 从而使人感到舒适。一般来说，外衣主要是受雨水的浸湿，所以可选择吸水性小的纤维作外衣材料；内衣主要是受身体的不显性蒸发和出汗浸湿，因此要选择吸湿和 吸水性大的纤维作内衣材料。

　　In the moisture absorption performance of fibers, in addition to moisture absorption, the water absorption of fiber materials is also closely related to the wearing comfort of fabrics. The water absorption of fibers refers to their ability to absorb liquid water. The water vapor and sweat generated by people during activities are mainly absorbed and dissipated by the moisture absorption and water absorption properties of materials, making people feel comfortable. Generally speaking, outerwear is mainly soaked by rainwater, so fibers with low water absorption can be chosen as the outerwear material; Underwear is mainly affected by the body's invisible evaporation and sweating, so it is necessary to choose fibers with high moisture absorption and water absorption as underwear materials.