中小学校服面料的缩水率是指面料经洗涤或浸泡后的缩水率。缩水是指纺织品在一定状态下经过洗涤、脱水、干燥后，其长度或宽度发生变化的现象。收缩程度涉及到各种纤维、织物结构、加工过程中作用于织物的不同外力等，合成纤维和混纺织物的收缩最小，其次是羊毛、亚麻和棉织物，丝绸的收缩较大。大的是粘胶纤维，人造棉和人造毛织物。
The shrinkage of school uniform fabric refers to the shrinkage of fabric after washing or soaking. Shrinkage refers to the phenomenon that the length or width of a textile changes after washing, dehydration and drying in a certain state. The shrinkage of synthetic fiber and blended fabric is the smallest, followed by wool, flax and cotton, and silk is the largest. The big ones are viscose, rayon and wool.
校服面料缩水有哪些因素
What are the factors for the shrinkage of school uniform fabric
中小学校服面料具有不同的纱线支数和缩水率。细纱厚布的收缩率较大，细纱织物的收缩率较小。织物的收缩率随生产工艺的不同而变化。一般来说，在纺织染整过程中，纤维需要多次拉伸，加工时间长，张力较大的织物收缩率大，张力较大的织物收缩率小。
Primary and secondary school uniform fabrics have different yarn count and shrinkage. The shrinkage of thick spun fabric is larger than that of spun fabric. The shrinkage of fabric varies with the production process. Generally speaking, in the process of textile dyeing and finishing, the fiber needs to be stretched many times, the processing time is long, the shrinkage of the fabric with larger tension is larger, and the shrinkage of the fabric with larger tension is smaller.

天然植物纤维（如棉、麻）和再生植物纤维（如粘胶）比合成纤维（如聚酯、丙烯酸）更容易吸水和膨胀，收缩率更高，而羊毛由于纤维表面的鳞片结构而容易毡合。影响其尺寸稳定性的Rs。
Natural plant fibers (such as cotton and hemp) and regenerated plant fibers (such as viscose) are easier to absorb water and expand than synthetic fibers (such as polyester and acrylic acid) with higher shrinkage, while wool is easy to felt due to the scale structure of fiber surface. Rs that affect the dimensional stability of the alloy.
一般来说，校服机织物的尺寸稳定性优于针织物，高密度织物的尺寸稳定性优于低密度织物。一般而言，平纹织物的收缩率比法兰绒织物小，而针织物的收缩率比罗纹织物小。由于织物在染整过程中不可避免地受到机械拉伸，织物上存在张力。
Generally speaking, the dimensional stability of school uniform woven fabric is better than that of knitted fabric, and the dimensional stability of high-density fabric is better than that of low-density fabric. Generally speaking, the shrinkage of plain fabric is smaller than that of flannel fabric, while that of knitted fabric is smaller than that of rib fabric. Due to the inevitable mechanical stretch of the fabric in the dyeing and finishing process, there is tension on the fabric.
然而，织物遇水后很容易释放张力，所以我们会发现织物在洗涤后会收缩。在实际生产中，通常采用预收缩法来解决这一问题。洗涤护理包括洗涤、干燥和熨烫。这三个步骤中的每一个都会影响织物的收缩。例如，手洗样品的尺寸稳定性优于机洗样品，洗涤温度也会影响尺寸稳定性。一般来说，温度越高，稳定性越差。样品的干燥方法对织物的收缩也有很大的影响。
However, the fabric is easy to release tension when it comes to water, so we will find that the fabric will shrink after washing. In practical production, pre shrinkage method is usually used to solve this problem. Washing care includes washing, drying and ironing. Each of these three steps affects the shrinkage of the fabric. For example, the dimensional stability of hand washed samples is better than that of machine washed samples, and the washing temperature also affects the dimensional stability. Generally speaking, the higher the temperature, the worse the stability. The drying method of the sample also has a great influence on the shrinkage of the fabric.