Due to the special properties of dyes used in some dyeing machines, some special requirements are put forward for the pretreatment process. For example, when dyeing with reactive dyes, the dyes are reactive dyes, which are sensitive to the chemical environment they are exposed to

1) Scouring and bleaching should be uniform to avoid waste of reactive dyes;

2) If chlorine or bleaching powder remains on the cloth, most of the reactive dyes will be destroyed and the dyed luster will be lighter and darker;

3) After pretreatment, the cloth surface was neutral. Because the cloth surface with alkali, easy to cause uneven dyeing, cloth with acid will affect the dye cause, make it light color, pretreatment has good capillary effect, cloth surface pH is uniform, pH value is 6 ~ 7.

In a word, the quality of grey fabric for dyeing machine and the selection of pretreatment process have some influence on dyeing proofing and dyeing quality. Therefore, the preparation of grey cloth before dyeing and proofing is an important work.

Jingjiang Huaxia Technology Co., Ltd. has developed, produced and sold printing and dyeing equipment such as high temperature dyeing machine, small sample dyeing machine and medium sample dyeing machine for many years. As a high-tech enterprise, Huaxia technology adheres to scientific and technological innovation, constantly upgrades and optimizes, obtains a number of invention patents and puts them into the production of dyeing machine, which helps to achieve the first-time success of dyeing and improves the efficiency and quality of printing and dyeing!