Color fastness of common types of printing and dyeing
Many people have misunderstandings or understanding of “Color fastness of common types of printing and dyeing“. Next, let the editor take everyone together to share with friends and explore the “Common color fastness of printing and dyeing” Knowledge of seed color fastness“…
Unsatisfactory color fastness is a fatal flaw for cotton, polyester and cotton fabrics. Different color fastness requirements will cause great cost differences. Therefore, many fabric manufacturers often require dyeing factories to Using lower-cost domestic dyes to reduce dyeing costs often brings about a series of problems in color fastness.
General concept of color fastness
Color fastness is a quality requirement for colored and printed fabrics. Because dyed fabrics may become discolored or discolored due to wear, sweat, friction, cleaning, ironing, etc. during wearing and storage, thus affecting the appearance of the fabric or workwear. The nature or degree of variation in color state can be expressed by color fastness. The color fastness of fabric is related to the 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.
1． Sunlight fastness
Sunlight fastness refers to the degree to which a colored fabric changes color due to the effects of sunlight. The test method can be either sun exposure or sun exposure. The fading degree of the sample after exposure is compared with the standard color sample. It is divided into 8 levels, 8 is good, and 1 is poor. Fabrics with poor sun fastness should not be exposed to the sun for long periods of time and should be placed in a ventilated place to dry in the shade.
2． Cleaning fastness
Washing or soaping fastness refers to the degree of color change of colored fabrics after being washed with cleaning solution. The gray graded 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 cleaning fastness is divided into 5 levels, with level 5 being good and level 1 being poor. Fabrics with poor cleaning fastness should be dry cleaned. If wet cleaning is performed, extra attention should be paid to the cleaning conditions, such as the cleaning temperature should not be too high and the cleaning time should not be too long.
3． Rubbing fastness
Rubbing fastness refers to the degree of color fading of colored fabrics after rubbing, and can be divided into dry rubbing and wet rubbing. The rubbing fastness is evaluated based on the staining degree of white cloth, which is divided into 5 levels (1~5). The larger the value, the better the rubbing fastness. Fabrics with poor rubbing fastness have a limited service life.
4. Perspiration fastness
Perspiration fastness refers to the degree of color fading of colored fabrics after being immersed in sweat. Since the composition of artificially prepared sweat is not exactly the same, the perspiration fastness is generally not only measured separately, but also combined with other dyeing fastnesses for assessment. The perspiration fastness is divided into levels from 1 to 5, with the higher the value, the better.
5. Ironing fastness
Ironing fastness refers to the degree of discoloration or fading of colored fabrics when ironed. 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 levels 1 to 5, with level 5 being good and level 1 being poor. When testing the ironing fastness of different fabrics, the test iron temperature should be selected.
6. Sublimation fastness
Sublimation fastness refers to the degree of sublimation of dyed fabrics during storage. The sublimation fastness uses a gray grading sample card to evaluate the degree of discoloration, fading and white cloth staining of fabrics after dry heat pressing. It is divided into 5 levels, with level 1 being poor and level 5 being good. The color fastness of normal fabrics generally requires level 3 to 4 to meet the needs of wearing. 6 Common Color Fastnesses of Printing and Dyeing
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