How are the main textile fastnesses classified?

1. Light fastness

Light fastness refers to the degree to which colored fabrics are discolored by sunlight. The test method can be sun exposure or sun exposure machine. 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. From the dyed without borders

2. Rub fastness

Rubbing fastness refers to the degree of 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. 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.

4. Ironing fastness

Ironing fastness refers to the degree of discoloration or fading of dyed 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 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.

5. Perspiration fastness

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.

6. Sublimation fastness

Sublimation fastness refers to the degree of sublimation that occurs in 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.