Six essential steps before fabric dyeing and finishing
Abstract: Fabric dyeing and finishing is an important part of fabrics. Any slight mistake may lead to fabric dyeing and finishing failure, causing defects in the entire batch of fabrics, affecting quality and price. The following six steps will explain in detail the details before dyeing and finishing the fabric.
⑴Preparation of gray fabric: There are three main points in the preparation of gray fabric: inspection of gray fabric – turning over (batch, box, print) – seam head.
⑵Singeing: The fluff on the surface of the fabric will affect the quality and wearing performance of the dyeing and finishing process, and it must be singed
Key words:
Fabric dyeing and finishing is an important part of fabrics. Any slight mistake may lead to fabric dyeing and finishing failure, causing defects in the entire batch of fabrics, affecting quality and price. The following six steps will explain in detail the details before dyeing and finishing the fabric.
⑴grey cloth preparation:There are three main points in gray cloth preparation: gray cloth inspection-turning (in batches, cartons, Print) – seam head.
⑵Singeing:The fluff on the surface of the fabric will affect the quality of the dyeing and finishing process and the wearing performance. It must be singed to make the cloth surface smooth and clean. Singeing is to make the gray cloth quickly pass through the flame of the singeing machine or rub the red-hot metal surface in a flat width, causing the fluff on the cloth surface to burn due to rapid heating, while the fabric itself has a tighter, thicker structure and a faster heating Slowly, it has left the flame or red-hot metal surface before the temperature reaches the ignition point, thereby achieving the purpose of burning away the fluff without damaging the fabric.
⑶Desizing:Before weaving woven fabrics, the warp yarns generally undergo sizing treatment to improve the strength, wear resistance and smoothness of the warp yarns and facilitate weaving. However, the slurry on the gray fabric is unfavorable to the printing and dyeing process, because the presence of slurry will contaminate the entire working fluid, consume dyeing materials, and even hinder the natural fibers of the dyeing materials, affecting the quality of the printing and dyeing products. Therefore, the fabric must undergo desizing at the beginning of the dyeing and finishing process.
Desizing can be divided into enzyme desizing, alkali desizing, acid desizing and oxidant desizing. Desizing alkali is a common method currently used in printing and dyeing factories. It is used on pure cotton or blended fabrics and can remove most sizing. It also has a certain decomposition and removal effect on natural impurities on cotton fibers. However, alkali desizing only reduces the adhesion between the sizing and the fabric, but does not degrade the sizing. Therefore, it must be fully washed after desizing, and the lotion must be constantly replaced. . Since the caustic soda used for desizing is generally waste alkali, the cost of desizing is low.
⑷Scouring: After desizing the cotton fiber fabric, most of the pulp and a small number of natural impurities have been removed, but most of the natural impurities in the cotton fiber, such as waxy substances, pectin, nitrogen-containing Substances, cotton seed shells, a small amount of oil and a small amount of slurry still remain on the fabric, making the cotton fiber fabric surface yellower, with poor moisture absorption and permeability, and cannot meet the requirements of subsequent dyeing and finishing processing. In order to make the cotton fiber fabric have a certain degree of water absorption and permeability, which is beneficial to the adsorption and diffusion of dye additives during the dyeing and finishing process, it must be scoured after desizing to remove most of the residual impurities in the cotton fiber. .
<B style="mso-bidi-font -weight:��The concentration, temperature, action time and tension of the lye on the fabric. The commonly used method to test the mercerizing effect is the barium value method, which measures the adsorption capacity of cotton fibers to chemicals. The higher the barium value, the better the mercerizing effect. Usually the barium value of this glossy cotton fiber fabric is 100. The barium value of mercerized thick fabrics is usually between 130 and 150. A barium value above 150 means that the cotton fiber is fully mercerized
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