Textile color fastness analysis

The color fastness of textiles refers to the resistance of the color of textiles to various effects during processing and use. The fastness grade is evaluated according to the discoloration of the sample and the staining of the undyed lining fabric. Textile color fastness test is a routine test item in the internal quality test of textiles, especially for textile export enterprises, this test index is particularly important.　　 Color fastness refers to the washing resistance and rubbing resistance of the product, the appearance color change of the textile under the action of external force, and the color change of the textile under other chemical conditions. The color fastness is good or bad, which directly relates to the health and safety of the human body. During the wearing process, the product with poor color fastness will cause the pigment on the fabric to fall off and fade when it encounters rain or sweat. The dye molecules 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 may also affect other clothing worn on the body to be stained, or 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 the dyed fabric under the action of external factors (extrusion, friction, washing, rain, exposure, etc.) during use or processing. It is a part of the fabric. Important indicators. Because the conditions of fabrics in the process of processing and use are very different, the requirements are different, so most of the current test methods are simulation tests or comprehensive tests according to the working environment and conditions, so the test method of color fastness The content is quite extensive. However, looking at the International Standards Organization (ISO), the American Society of Dyeers and Chemists (AATCC), Japan (JIS), the United Kingdom (BS) and many other standards, the most commonly used are washing resistance, light resistance, abrasion resistance, perspiration resistance, and Ironing, weather resistance, etc. In actual work, the test items are mainly determined according to the end use of the product and product standards. For example, the wool textile product standard stipulates that the color fastness to sunlight must be tested. Of course, the perspiration fastness of knitted underwear must be tested. Textiles (such as parasols, light box cloth, canopy materials) must of course be tested for color fastness to weather. Dyeing fastness is the quality requirement for dyed and printed fabrics. Because dyed fabrics will be colored or discolored due to light, sweat, friction, washing, ironing, etc. during wearing and storage, which will affect the appearance of the fabric or clothing. The nature or degree of the variation of the dyeing state can be expressed by the color fastness. The dye fastness of the fabric is related to the 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, etc.

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