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What are the types of fabric color fastness tests?
General concept of color fastness: Color fastness is the 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. 1. Light fastness to light fastness refers to the degree to which colored fabrics are discolored by sunlight. The test method can be either sunlight exposure or sunlight exposure. The fading degree of the sample after exposure is compared with the standard color sample, and it is divided into 8 grades, 8 grades are the best, and 1 grades are the worst. Fabrics with poor light fastness should not be exposed to the sun for a long time, and should be dried in a ventilated place. Second, rubbing fastness Rubbing fastness refers to the degree of color fading of dyed fabrics after rubbing, which can be divided into dry rubbing and wet rubbing. The rubbing fastness is based on the staining degree of white cloth as the evaluation principle, which is divided into 5 grades (1~5). The larger the value, the better the rubbing fastness. The service life of fabrics with poor rubbing fastness is limited. 3. Fastness to perspiration Perspiration fastness refers to the degree of fading of dyed fabrics after they are soaked in sweat. The perspiration fastness is not the same as the artificially prepared perspiration components, so it is generally not only measured separately, but also evaluated in combination with other color fastnesses. Perspiration fastness is divided into 1 to 5 grades, the larger the value, the better. 4. Washing fastness Washing or soaping fastness refers to the degree of color change of dyed fabrics after washing with washing liquid. The gray grading sample card is usually used as the evaluation standard, that is, the evaluation is based on the color difference between the original sample and the faded sample. The washing fastness is divided into 5 grades, 5 is the best and 1 is the worst. Fabrics with poor washing fastness should be dry cleaned. If wet cleaning is carried out, more attention should be paid to the washing conditions, such as the washing temperature should not be too high, and the washing time should not be too long. 5. Sublimation fastness Sublimation fastness refers to the degree of sublimation of dyed fabrics during storage. The sublimation fastness is graded by gray scale sample card to evaluate the discoloration, fading and white cloth staining of the fabric after dry hot pressing. The dyeing fastness of normal fabrics generally requires grades 3 to 4 to meet the needs of wearing. Six, ironing fastness Ironing fastness refers to the degree of discoloration or fading of dyed fabrics during ironing. The degree of discoloration and fading is evaluated by the staining of other fabrics by the iron at the same time. Ironing fastness is divided into 1 to 5 grades, 5 is the best and 1 is the worst. When testing the ironing fastness of different fabrics, the temperature of the test iron should be selected. Is a professional comprehensive supplier of material testing instruments and laboratory overall solutions, the main products are: rubbing color fastness tester, rubbing color fastness tester, perspiration color fastness tester, perspiration color fastness tester, Ironing sublimation color fastness tester, rubbing color fastness tester, perspiration color fastness tester, ironing sublimation color fastness tester, Japan rubbing color fastness tester, JIS rubbing color fastness tester, JIS rubbing resistance tester Color fastness testing machine, AATCC standard rubbing cloth, AATCC rubbing white cotton cloth, SDC standard rubbing cloth, ISO standard rubbing cloth, SDC rubbing white cotton cloth, etc.
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