What is dyeing and finishing? Is it poisonous?

Textile materials (fibers, yarns and fabrics) are mainly treated by chemical treatment. Dyeing and finishing, together with spinning, weaving or knitting, constitute the whole process of textile production. Dyeing and finishing includes pretreatment, dyeing, printing and finishing. The quality of dyeing and finishing has an important influence on the use value of textiles. Pretreatment, also known as scouring and bleaching, is mainly to remove impurities from textile materials, so that the subsequent dyeing, printing and finishing processes can be carried out smoothly and the expected processing effect can be obtained. Dyeing is the physical or chemical combination of dyes and fibers to make textile materials have a certain color. Printing is to obtain color patterns on textiles with color paste. Finishing is to improve the appearance of fabric such as luster and shape through physical action or using chemical reagents; Improve the wearability of the fabric or make the fabric have the characteristics of water and oil repellent. Most finishing processes are carried out in the later stage of fabric dyeing and finishing. In the dyeing and finishing of wool fabrics, many pretreatment processes are often classified as finishing, which is divided into wet finishing and dry finishing.

Poisonous!

Most dyeing and finishing processes are chemical processes. After chemical treatment, textile materials have to be washed and dried repeatedly, which consumes a lot of heat and water and requires high water quality. In the process of chemical treatment, harmful substances will also be produced, polluting air and water. Therefore, when determining the process and designing equipment, we must minimize the consumption of heat energy, improve the utilization rate of water and reduce pollution.