1. Shrinkage rate of fabric refers to the percentage of fabric shrinkage after washing or soaking in water. Generally speaking, the fabrics with the highest shrinkage rate are synthetic fibers and their blends, followed by wool and linen fabrics. Cotton fabrics are in the middle and have a larger shrinkage rate, while viscose fibers, synthetic cotton, and synthetic wool fabrics have the highest shrinkage rate. 2. Factors causing shrinkage of fabrics: ① The shrinkage rate of fabrics varies depending on the raw materials used. Generally speaking, fibers with high moisture absorption will expand, increase in diameter, shorten in length, and have a higher shrinkage rate when soaked in water. Some adhesive fibers have a water absorption rate of up to 13%, while synthetic fiber fabrics have poor moisture absorption and a small shrinkage rate The shrinkage rate of fabrics varies depending on their density. If the density in the latitude and longitude directions is similar, the shrinkage rate in the latitude and longitude directions is also similar. A fabric with a high warp density will experience greater longitudinal shrinkage, while a fabric with a weft density greater than the warp density will experience greater latitudinal shrinkage The shrinkage rate of fabrics varies depending on the thickness of the yarn count. The fabric with thicker yarn has a higher shrinkage rate, while the fabric with thinner yarn has a lower shrinkage rate The shrinkage rate of fabrics varies depending on the production process. Generally speaking, during the weaving and dyeing process of fabrics, the fibers need to be stretched multiple times, and the processing time is long. The fabric with higher tension will have a higher shrinkage rate, while the fabric with lower tension will have a lower shrinkage rate.