中小學(xué)校服面料的縮水率是指面料經(jīng)洗滌或浸泡后的縮水率。縮水是指紡織品在一定狀態(tài)下經(jīng)過洗滌、脫水、干燥后，其長度或?qū)挾劝l(fā)生變化的現(xiàn)象。收縮程度涉及到各種纖維、織物結(jié)構(gòu)、加工過程中作用于織物的不同外力等，合成纖維和混紡織物的收縮最小，其次是羊毛、亞麻和棉織物，絲綢的收縮較大。大的是粘膠纖維，人造棉和人造毛織物。
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.
校服面料縮水有哪些因素
What are the factors for the shrinkage of school uniform fabric
中小學(xué)校服面料具有不同的紗線支數(shù)和縮水率。細(xì)紗厚布的收縮率較大，細(xì)紗織物的收縮率較小。織物的收縮率隨生產(chǎn)工藝的不同而變化。一般來說，在紡織染整過程中，纖維需要多次拉伸，加工時間長，張力較大的織物收縮率大，張力較大的織物收縮率小。
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.

天然植物纖維（如棉、麻）和再生植物纖維（如粘膠）比合成纖維（如聚酯、丙烯酸）更容易吸水和膨脹，收縮率更高，而羊毛由于纖維表面的鱗片結(jié)構(gòu)而容易氈合。影響其尺寸穩(wěn)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.
一般來說，校服機織物的尺寸穩(wěn)定性優(yōu)于針織物，高密度織物的尺寸穩(wěn)定性優(yōu)于低密度織物。一般而言，平紋織物的收縮率比法蘭絨織物小，而針織物的收縮率比羅紋織物小。由于織物在染整過程中不可避免地受到機械拉伸，織物上存在張力。
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，織物遇水后很容易釋放張力，所以我們會發(fā)現(xiàn)織物在洗滌后會收縮。在實際生產(chǎn)中，通常采用預(yù)收縮法來解決這一問題。洗滌護理包括洗滌、干燥和熨燙。這三個步驟中的每一個都會影響織物的收縮。例如，手洗樣品的尺寸穩(wěn)定性優(yōu)于機洗樣品，洗滌溫度也會影響尺寸穩(wěn)定性。一般來說，溫度越高，穩(wěn)定性越差。樣品的干燥方法對織物的收縮也有很大的影響。
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.