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Color fastness analysis of textiles
Textile color fastness refers to the resistance of the color of textiles to various effects during processing and use. The fastness rating is based on the discoloration of the sample and the staining of the undyed backing fabric. Textile color fastness test is a routine test item in the inherent quality test of textiles, especially for textile export enterprises, this test index is particularly important. Color fastness refers to the washing and rubbing resistance of products, the appearance and color changes of textiles under the action of external forces, and the color changes of textiles under other chemical conditions. Good or bad color fastness is directly related to the health and safety of the human body. In the process of wearing a product with poor color fastness, when it encounters rain and sweat, the pigment on the fabric will fall off and fade, and the molecules of the dye and heavy metal ions are all It may be absorbed by the human body through the skin and endanger the health of the human skin. On the other hand, it will also affect other clothing worn on the body to be stained, or to stain other clothing when washed with other clothing. The so-called color fastness (referred to as color fastness) refers to the degree of fading of dyed fabrics under the action of external factors (extrusion, friction, washing, rain, exposure, etc.) during use or processing. important indicator. Because the conditions of fabrics in the process of processing and use are very different and the requirements are different, most of the current test methods are simulated tests or comprehensive tests according to the environment and conditions of the action. The content is quite extensive. However, looking at the International Standards Organization (ISO), the American Association of Dyers and Chemists (AATCC), Japan (JIS), the United Kingdom (BS) and many other standards, the most commonly used standards are wash resistance, light resistance, friction resistance and perspiration resistance. Ironing, weather resistance, etc. In actual work, the test items are mainly determined according to the final use of the product and the product standard. For example, the wool textile product standard stipulates that the color fastness to sunlight must be tested. Of course, the knitted underwear must be tested for the fastness to perspiration. Textiles (such as parasols, light box cloth, canopy materials) are of course tested for their colorfastness to weather. Color fastness is a quality requirement for dyed and printed fabrics. Because the dyed fabrics will be discolored or discolored due to light, sweat, friction, washing, ironing and other reasons during wearing and storage, which will affect the appearance of the fabric or clothing. The nature or degree of variation in dyeing state can be expressed in terms of color fastness. The dyeing fastness of fabric is related to fiber type, yarn structure, fabric structure, printing and dyeing method, dye type and external force. It can be divided into light fastness, washing or soaping fastness, rubbing fastness, perspiration fastness, ironing fastness and sublimation fastness.
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