Colour fastness and control of various textiles

6 main textile fastness
1. Light fastness
Light fastness refers to the degree to which colored fabrics are discolored by sunlight. The test method can be sunlight or sunlight machine. The color fading degree of the sample after sunlight is compared with the standard color sample, which is divided into 8 grades. Grade 8 is the best and Grade 1 is the worst. Fabrics with poor light fastness should not be exposed to the sun for a long time and should be placed in a ventilated place to dry in the shade.
2. Rubbing fastness
Friction fastness refers to the degree of fading of dyed fabric after friction, which can be divided into dry friction and wet friction. The rubbing fastness is evaluated according to the degree of staining of white cloth, which is divided into 5 grades (1-5). The higher the value, the better the rubbing fastness. The service life of fabrics with poor rubbing fastness is limited.
3. Washing fastness
The fastness to washing or soaping refers to the degree of color change of dyed fabrics after washing with washing solution. Generally, the gray grading sample card is 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 five grades, grade 5 is the best and grade 1 is the worst. The fabric with poor washing fastness should be dry cleaned. If it is wet washed, 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.
4. 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 iron on other fabrics at the same time. The ironing fastness is divided into 1-5 grades, of which grade 5 is the best and grade 1 is the worst. When testing the ironing fastness of different fabrics, the iron temperature for testing should be selected.
5. Fastness to perspiration
The fastness to perspiration refers to the degree of fading of dyed fabrics after being soaked with sweat. The perspiration fastness is generally tested in combination with other color fastness in addition to independent measurement because the components of artificially prepared perspiration are different. The fastness to perspiration is divided into 1-5 levels, and the higher the value, the better.
6. Sublimation fastness
Sublimation fastness refers to the degree of sublimation of dyed fabrics during storage. The degree of discoloration, fading and white cloth staining of the fabric after dry hot pressing treatment is evaluated by gray grading sample card for sublimation fastness, which is divided into 5 grades, of which grade 1 is the worst and grade 5 is the best.
The dyeing fastness of normal fabrics is generally required to reach Grade 3-4 to meet the wearing needs.