Now there is a misunderstanding in the market: it seems that the smaller the bath ratio, the better. In fact, the bath ratio of any overflow jet dyeing machine is not specified by the mechanical production enterprise, but should be determined by the dyeing and finishing enterprise when formulating the process according to the processed products. For example, for dyeing 60-100 / m2 light polyester fabric, the bath ratio is generally controlled between 1:12-1:15. Because the volume of light and thin fabric is large and the relative length is long, the bath ratio should be larger, otherwise, If 250G / m2 polyester / Cotton (or viscose) blended fabric is processed, the bath ratio should be controlled at about 1:10. Generally, the bath ratio depends on the fabric running in the machine, which takes about 1.5-2min.

Practice has proved that for light and thin fabrics, if the rotating speed is too fast, the more likely the fabric will contact the cloth guide roller, and the fabric weaving point will often slip (slip), but on the contrary, it is easy to produce color flowers. For ordinary fabrics, we should also pay attention to overload, which is not only due to the long accumulation time of the fabric in the cloth storage tank, In addition, during the retention process of the fabric in the machine, it is inevitable that the uneven heating will lead to color flower, and the fabric knotting and cloth blocking will often be caused by the fast and slow flow direction of the dye in the machine. At present, the minimum bath ratio of overflow jet dyeing machine is 1:6, and most of them are 1:8 or above.

In general, the quality of dyeing can not be determined by the bath ratio alone, but more importantly by the rationality of the whole machine design and its mechanical controllability. From the perspective of dyeing and finishing, whether the bath ratio is appropriate or not depends on the overall dyeing quality.