Dye fastness refers to the ability of dyes or pigments to maintain their original color state under the influence of various external factors during use or subsequent processing of dyed fabrics. It is one of the important quality indicators for measuring dyed finished products. Processing methods and fastness improving agents used in finishing are the keys to improving the dye fastness of fabrics. Maintaining the stability of fabric dye fastness is something that the textile industry needs to pay special attention to when finishing fabrics. The editor will explain to you 3 common dye fastnesses.
1.Sunlight fastness
Sunlight fastness, also known as sun color fastness, refers to the degree to which colored fabrics change color due to sunlight. According to the test method, either sunlight or a sun machine can be used. The fading degree of the sample after exposure is compared with the standard color sample. According to the national standard, it is divided into 8 levels, 8 is good, and 1 is poor. Factors that affect the light fastness include the choice of dye, the level of dyeing concentration, the dyeing process, the state of aggregation on the fiber, etc. Generally, when finishing the light fastness of fabrics, in addition to selecting the appropriatefastness improving agent , such as Texnology®SC, a light fastness improving agent, it is also necessary to do a good job in the dyeing process, dye selection and other details to improve the light fastness of the fabric.
2.Wet rubbing fastness
Wet rubbing fastness refers to the degree of color fading of dyed fabrics after rubbing. The wet rubbing fastness of fabric mainly depends on the selection of dye, the combination of dye and fiber and the uniformity of dye penetration. If the dye concentration used during dyeing is not properly adjusted and the dyeing concentration is high, it will easily cause floating color and low wet rubbing fastness. Therefore, the selection of dyes, the selection of fixing agents, and the fastness improving agents required for finishing after testing the pH value of the dyed cloth, such as the wet rubbing fastness improving agent Texnology® R25, etc. Proper processing is required to improve the wet rubbing fastness of the fabric.
3.Soaping fastness
It refers to the degree of fading of dyed products after soaping in soap solution under specified conditions. It includes two items: original fading and white cloth staining. Original fading refers to the fading of printed and dyed fabrics before and after soaping; white cloth staining refers to the situation where white cloth and dyed fabrics are sewn together in a certain way. After soaping, the white cloth loses color due to fading of the dyed fabrics. Soaping fading of dyed products is when the dye on the fabric is exposed to external force and detergent in the soap solution, destroying the combination of the dye and the fiber, causing the dye to fall off the fabric and fade. The factors that affect soaping fastness mainly include dye selection, dyeing process, concentration, soaping conditions, etc.
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