the Importance of pretreatment process
In the whole process of dyeing and finishing, from the grey fabric to the pre-treatment process of the bleached fabric, the semi-finished products can guarantee the quality of dyeing, printing and finishing. It plays an important role in improving the economic efficiency of enterprises and adapting to various requirements of the market. It has been proved that about half of the dyed defects are caused by errors in pre-processing. The most common errors come from: uneven firing; inadequate desizing; fluctuation of whiteness; poor wettability; uneven residual moisture content; unevenness of mercerizing barium value and fluctuation of PH value; residue of auxiliaries and chemicals on fabrics. The main purpose of a good pretreatment process is to remove the outward fibers to give the fabric a smooth surface, to effectively and efficiently remove the natural impurity in the fiber, such as grease, pigment, nitrogen-containing substances and lignin, size, etc. A fabric with full moisture absorption capacity is obtained; a plump and softer fabric is obtained without excessive loss of weight and strength; a proper whiteness is obtained; the fabric has good dimensional stability and uniform dye uptake; it meets the requirements of clean production. Excellent pre-processing and textile raw materials, structure, processing process routes, chemical aids and dyeing and finishing equipment are closely related. The process effect of pretreatment plays an important role in the internal quality and appearance performance of the final finished product of dyeing and finishing process; the process route of pretreatment determines the production cycle of the product; the process conditions of pretreatment affect water and electricity, Consumption of steam and chemical auxiliaries. The most severe impact of the printing and dyeing industry on the environment is the pretreatment process, which is an important measure in the sustainable development strategy of the printing and dyeing industry. High-efficiency auxiliaries, new equipment synchronous development.