Will school uniform fabrics shrink? What are the factors that cause school uniform fabrics to shrink
Will school uniform fabrics shrink? What are the factors that cause school uniform fabrics to shrink? The shrinkage rate of primary and secondary school uniform fabrics refers to the shrinkage rate of the fabric after washing or soaking. Shrinkage refers to the phenomenon that the length or width of textiles changes after washing, dehydration, and drying under certain conditions. The degree of shrinkage involves various fibers, fabric structures, different external forces acting on the fabric during processing, etc. The shrinkage of synthetic fibers and blended fabrics is small, followed by wool, linen and cotton fabrics, and the shrinkage of silk is larger. The larger ones are viscose, artificial cotton and artificial wool fabrics.
Primary and middle school uniform fabrics have different yarn counts and shrinkage rates. Thick gauze fabrics have a larger shrinkage rate, while spun gauze fabrics have a smaller shrinkage rate. The shrinkage of fabrics varies with production processes. Generally speaking, during the textile dyeing and finishing process, the fibers need to be stretched multiple times, and the processing time is long. Fabrics with greater tension have a greater shrinkage rate, while fabrics with greater tension have a smaller shrinkage rate. Natural plant fibers (such as cotton, linen) and regenerated plant fibers (such as viscose) are more likely to absorb water and swell and have a higher shrinkage rate than synthetic fibers (such as polyester, acrylic), while wool is easy to feel due to the scale structure on the fiber surface. combine. Rs affecting its dimensional stability.
Generally speaking, the dimensional stability of school uniform woven fabrics is better than knitted fabrics, and the dimensional stability of high-density fabrics is better than low-density fabrics. Generally speaking, plain fabrics shrink less than flannel fabrics, and knitted fabrics shrink less than rib fabrics. Since the fabric is inevitably mechanically stretched during the dyeing and finishing process, there is tension on the fabric. However, fabrics easily release tension when exposed to water, so we will find that the fabric shrinks after washing. In actual production, pre-shrinking method is usually used to solve this problem. Laundry care includes washing, drying and ironing. Each of these three steps affects the shrinkage of the fabric. For example, hand-washed samples have better dimensional stability than machine-washed samples, and washing temperature also affects dimensional stability. Generally speaking, the higher the temperature, the worse the stability. The drying method of the sample also has a large impact on the shrinkage of the fabric.
Keywords:
School uniform fabrics School uniform fabrics shrink
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