In everyday life, fastness is the most frequently asked question of all dyeing questions.
Dye fastness has high requirements for the quality of dyed and printed fabrics, and the nature or degree of variation in dyeing state can be expressed by dye fastness. It is related to the yarn structure, fabric structure, printing and dyeing method, dye type and external force. Different staining fastness requirements can cause large cost differences and quality differences.
6 main textile fastness at one time!
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 irradiation, and the degree of fading of the sample after exposure is compared with the standard color sample, which is divided into 8 grades, 8 grades are the best, and 1 grade is the worst. Fabrics with poor sun fastness should not be exposed to the sun for a long time, and should be placed in a ventilated place to dry.
2. Rubbing fastness
Rubbing fastness refers to the degree to which the dyed fabric fades after rubbing, which can be divided into dry friction and wet friction. The rubbing fastness is based on the degree of white cloth staining as the evaluation principle, which is divided into 5 grades (1~5), and the larger the value, the better the friction fastness. Fabrics with poor friction fastness are limited in their service life.
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 color difference between the original sample and the sample after fading is used for evaluation. The washing fastness is divided into 5 grades, with grade 5 being the best and grade 1 being the worst. Fabrics with poor washing fastness should be dry cleaned, and if wet cleaning, more attention should be paid to the washing conditions, such as the washing temperature should not be too high, and the time should not be too long.
4. Ironing fastness
Fastness to ironing refers to the degree to which a dyed fabric changes or fades when ironed. The degree of discoloration and fading is measured by the staining of the iron to other fabrics at the same time. The ironing fastness is divided into 1~5 grades, with grade 5 being the best and grade 1 being 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 discoloration of dyed fabrics after being soaked in perspiration. Perspiration fastness is generally assessed in combination with other color fastness in addition to being measured separately due to the different components of artificially prepared sweat. The perspiration fastness is divided into 1~5 grades, and the larger the value, the better.
6. Sublimation fastness
Sublimation fastness refers to the degree of sublimation that occurs in the storage of a dyed fabric. The sublimation fastness was evaluated by a gray grading sample card to evaluate the degree of discoloration, fading and discoloration of the white cloth after dry hot pressing treatment, which was divided into 5 grades, with grade 1 being the worst and grade 5 being the best. The dyefastness of normal fabrics is generally required to reach 3~4 in order to meet the needs of wearing.
