Spot check 16% color fastness unqualified What is color fastness?

On November 1, the General Administration of Quality Supervision, Inspection and Quarantine notified the 2016 special inspection of the national supervision on the quality of e-commerce bedding products, and inspected 50 batches of products produced by 48 enterprises, and the detection rate of unqualified products was 16%. This time, 8 items including formaldehyde content, pH value, decomposable carcinogenic aromatic amine dyes, color fastness to acid and perspiration, color fastness to alkali and perspiration, color fastness to water, color fastness to dry rubbing, and fiber content were tested. After inspection, a total of 8 batches of products were unqualified. The main quality problems were: 3 batches of products failed in pH value, 2 batches of products were unqualified for decomposable carcinogenic aromatic amine dyes, and 4 batches of products failed in fiber content. According to the report, one batch of exquisite tribute satin jacquard four-piece byford Baifudi from Hangzhou Baifudi Home Textile Co., Ltd. was found to be unqualified for pH value and fiber content; a batch of elegant e-commerce (Beijing) Co., Ltd. Silk cotton jacquard four-piece set S009 elegant 100, the fiber content item is unqualified. 1. What is color fastness? 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 testing is a routine testing item in the intrinsic quality testing of textiles. 2. What are the aspects of color fastness? The common ones are color fastness to soaping, color fastness to rubbing, color fastness to chlorine water, color fastness to non-chlorine bleaching, color fastness to dry cleaning, color fastness to actual washing (garments, fabrics), color fastness to perspiration Color fastness to water, color fastness to light, color fastness to sea water, color fastness to saliva, etc. 3. How to rate the color fastness? What is the unit? Different uses of dyed products have different requirements for dyeing fastness. In the simulation experiment, according to the color change of the sample before and after the experiment, compare it with the standard sample card to obtain the grade of color fastness. The fastness to soaping, rubbing, and perspiration is divided into five grades, the first grade is the worst and the fifth grade is the best; the light fastness and weather fastness are divided into eight grades, the first grade is the worst and the eighth grade is the best. The unit is the level. 4. What is the highest color fastness of cotton cloth? How many grades are the first-class products of the national standard? All cotton fabrics are generally dyed with reactive dyes, among which the color fastness to dry and wet rubbing is above the international first-class dry level 4, and the wet level is above 3; the color fastness to washing, discoloration and staining are required to be above level 4. Reactive dyes generally have poor color fastness to wet rubbing. If the colorant is not reinforced, generally dark fabrics can only be up to 2.5 grades, and the 3rd grade can basically be achieved after the reinforced colorant. Color fastness to washing: Green or brilliant blue color can only be stained up to level 3, the bright red may be stained up to level 3.5, and others can generally reach level 4. Reactive dyes are currently used in the largest amount, and the use process and related auxiliaries are relatively complete and mature, so the general color fastness can be handled well. For example, reactive dyes generally have low fastness to chlorine bleaching, and blue varieties of anthraquinone structure dyes There is a phenomenon of smoke fading, but they can be improved with additives, but the cost is different. By the way, if you want to dye light-colored varieties, most cotton fabrics use high-cost vat dyes, because the light fastness (required above level 4) mainly depends on the dye itself, and the auxiliaries and processes are difficult to improve or limited. . 5. What does self-staining fastness mean? Color fastness to self-staining (commonly called) refers to when there are multiple colors in the sample (yarn-dyed, or printing), and the shades are obviously different, when the sample or clothing is easily cross-contacted with itself, such as washing, it may cause dark Color stains light colors. During the test, the dark part and the light part are generally taken directly from the fabric, and they are sewed together to form a combined sample, and the required test procedure can be operated. When grading, it mainly depends on the light color staining. 6. What is the difference between color fastness to water and color fastness to washing? The color fastness to water is the color fastness to water immersion. The textile sample is attached to the specified lining fabric, immersed in water, squeezed out of water, and placed in the middle of two flat plates, and a certain pressure is given to dry the sample. After lining and lining, use a gray sample card to evaluate the discoloration of the sample and the staining of the lining; the color fastness to washing is also called the color fastness to soaping. In soap solution or a mixture of soap and anhydrous sodium carbonate, after a specific washing procedure in a washing color fastness tester, after washing and drying, use the original sample as a reference, and use a gray sample card or instrument to evaluate the discoloration and color of the sample. Stained backing. In short, the former just needs to be left standing in water, and the latter is washed with soapy water. 7. What is color fastness, what is color fastness, what is the difference? Color fastness refers to the ability of the dye to maintain its original color. Validated in the environment of light, hot and cold cycles, chemical reagents, etc. Color fastness,The ability of dyes to transfer adhesion to other materials. It has been verified in experimental environments such as 100 grid tests, dry friction, chemical reagents, and sweat. The specific test items are increased or decreased according to product performance requirements and working environment. 8. Is the color fastness marked on clothing products better or smaller? The greater the color fastness, the less likely it will fade during the cleaning process. For garment washing, color fastness is the firmness of the color, and the larger the color, the less likely it will fade.

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