The test of color fastness of fabrics generally includes color fastness to light, climate, washing, rubbing and perspiration. Sometimes there are some special requirements for color fastness according to different textiles or different use environments. Generally, when conducting the color fastness test, it is the degree of discoloration of the dyed fabric and the degree of staining of the adjacent fabric. For the color fastness rating, except for the light fastness, which is eight, the rest are five. The higher the grade, the better the color fastness.
1. Light fastness tester: light fastness refers to the degree of discoloration of colored fabrics under the action of sunlight. The test method is to compare the fading degree of the sample after simulated sunlight with that of the standard color sample, which is divided into 8 grades, 8 grades is the result, and 1 grade is poor. Fabrics with poor light fastness should not be exposed to the sun for a long time, and should be put in a ventilated place to dry in the shade.
Sun color fastness tester principle: Textiles are usually exposed to light when they are in use. Light energy destroys dyes and causes permanent "fading" and discoloration of colored textiles. Generally, they become lighter and darker, and some also have color changes. Therefore, it is necessary to test the color fastness. The light fastness test is to put the sample and the blue wool standard cloth of different fastness grades together under the specified conditions for sunlight exposure, and the sample and the blue The wool cloth is compared to evaluate the color fastness to light. The higher the grade of the blue wool standard cloth, the more light fast it is.
2. Color fastness to washing: 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 color difference between the original sample and the sample after fading is used for evaluation. The washing fastness is divided into 5 grades, grade 5 and grade 1 are the worst. Fabrics with poor washing fastness should be dry-cleaned. If wet-cleaned, you need to pay more attention to the washing conditions, such as the washing temperature should not be too high, and the washing time should not be too long. (Applicable model HT-1056 washable color fastness tester)
Washable color fastness tester principle: the sample is sewn together with the standard lining fabric, washed, washed and dried, and washed under the appropriate temperature, alkalinity, bleaching and friction conditions, so that the color fastness can be obtained in a short time Test Results. The friction between them is accomplished through the tumbling and impact of a small bath ratio and an appropriate number of stainless steel balls, and the gray card is used for rating to obtain the test results. Different test methods have different temperature, alkalinity, bleaching and friction conditions and sample size, which should be selected according to test standards and customer requirements. Generally, the colors with poor color fastness to washing include green orchid, brilliant orchid, black red, navy blue and so on.
Color fastness to dry cleaning: Same as color fastness to washing, except that washing is changed to dry cleaning.
3. Rubbing color fastness tester: Rubbing fastness refers to the degree of color fading of dyed fabrics after rubbing, which can be both dry rubbing and wet rubbing. The rubbing fastness is evaluated based on the degree of staining of the white cloth, which is divided into 5 grades. The larger the value, the better the rubbing fastness. (Applicable model HT-1021 electric friction color fastness tester)
Friction color fastness tester principle: put the sample on the rubbing fastness tester, and rub it with a standard rubbing white cloth for a certain number of times under a certain pressure. Each group of samples needs to be tested for dry rubbing color fastness and wet rubbing color fastness . Use the gray card to rate the color stained on the standard rubbing white cloth, and the grade obtained is the measured color fastness to rubbing. The color fastness to rubbing needs to be tested by dry rubbing and wet rubbing, and all the colors on the sample must be rubbed.
4. Color fastness to perspiration: Perspiration fastness refers to the degree of color fading of dyed fabrics after a small amount of sweat.
(Applicable model HT-1049 Perspiration Color Fastness Tester)
The principle of perspiration color fastness tester: sew the sample together with the standard lining fabric, place it in the perspiration liquid for treatment, clamp it on the perspiration color fastness tester, put it in an oven at constant temperature, then dry it, and use the gray card for rating , get the test result. Different test methods have different proportions of perspiration liquid, different sample sizes, different test temperatures and time.
5. Ironing fastness: refers to the degree of discolouration or fading of the dyed fabric when ironing.
Colour fastness to pressing: the dry specimen is covered with cotton lining fabric and then pressed for a certain time in a heating device at a defined temperature and pressure, after which the discolouration of the specimen and the staining of the lining fabric are assessed with a grey sample card. Hot pressing fastness has dry pressure, tide pressure, wet pressure, according to different customer requirements and test standards to choose the test method.
6, sublimation fastness: refers to the degree of sublimation that occurs in the storage of dyed fabrics. Normal fabric fastness to dyeing, generally required to reach 3-4 levels in order to meet the needs of wearing.
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