Do you know single dyeing and double dyeing of blended fabrics?

Single dyeing means dyeing only one fiber in the fabric. Let’s take T/C65/35 fabric as an example. Because the composition and structure of the two fibers are different, the dyes and dyeing methods used are different. Therefore, if you only use one dyeing method to dye this cloth, one fiber will appear. The fiber is colored but the other fiber is not colored, so the fabric has a uniformly distributed gray effect (Figure 1). This method is used to create different cloth styles.

However, single-dyed fabrics are prone to problems. Why? (As shown in Figure 2).

In fact, in the spinning process, there is a process called drawing. The function of drawing is to improve the internal structure of the sliver, thereby improving the uniformity of its long segments, while reducing the weight unevenness, making the fibers in the sliver straight and parallel, reducing hooks, making the fineness comply with regulations, and making different types or different High-quality raw materials are mixed evenly to achieve the specified mixing ratio. And if the raw materials are mixed unevenly, a situation like Figure 2 will occur.

Therefore, single-dyed blended yarn fabrics have higher and stricter yarn requirements. The ordinary yarn drawing process involves two drawings (referred to as two-drawing). Single-dyed yarns must be drawn three times. The more times of merging and merging, the more evenly the raw materials will be mixed and the better the effect will be after single dyeing.