Scouring is an important process in the dyeing and printing of cotton - based cellulose fiber and its blended fabric. For example, natural cotton fibers contain about 10% of natural impurities, including pectin substances, nitrogenous substances (mainly proteins), waxy substances, ash (inorganic salts), and cotton seed shells.
These substances affect the water absorption and color of the fabric, which makes it difficult to process. Generally speaking, these impurities can be converted into soluble substances and removed under alkaline conditions, so caustic soda is the main auxiliary agent for refining. But some substances, such as waxy substances, must be removed by emulsification. In order to speed up the scouring, improve capillary effect and whiteness, fabric in refined processing, in addition to alkali agent, also need to add a certain amount of high efficiency scouring agent, facilitate scouring liquid evenly to quickly penetrate the fabric inside, give full play to the role of the scouring liquid, and emulsifying dispersion to remove impurities, to prevent the impurity contamination to the fabric again.