Color fastness
Color fastness (Color fastness) is also called dye fastness and dye fastness. . It refers to the resistance of the color of textiles to various effects during processing and use.
The fastness grade is evaluated based on the discoloration of the sample and the staining of the undyed backing fabric. Textile color fastness testing is a routine testing item in the intrinsic quality testing of textiles.
During the use of textiles, they will be affected by various external effects such as light, washing, ironing, sweat stains, friction and chemicals. Some printed and dyed textiles have also undergone Special finishing processes, such as resin finishing, flame retardant finishing, sand washing, sanding, etc., require the color and luster of printed and dyed textiles to maintain a certain degree of fastness.
Color fastness
Color fastness is referred to as color fastness; colored fibers, fabrics or The color of other colorants depends on their resistance to various corrosion effects such as sunlight, washing, friction, sweat stains, etc. during processing and use.
The color richness rating is grade 5 except for the lightfastness (fastness to light and aging) which is grade R. The higher the grade, the better the color fastness. There are two methods for measuring leather: fading (color change of the leather itself) and staining (contamination of contact objects).
The fading test is the color difference between the leather sample and the untreated test sample after the leather sample is processed according to specified conditions, using a standard gray sample card Compare ratings. The staining test is to touch the sample with a standard white cloth according to specified conditions. The degree of color transfer and staining of the white cloth by the sample is determined, and the grade is measured by the gray staining sample card.
Stain fastness
Ready-made garments composed of parts of different colors may sometimes change during storage Migration of dyes from one area to another will occur, usually from the dark part to the light part. This phenomenon is different from sublimation because it occurs at a temperature lower than the sublimation temperature, and non-sublimation dyes will also This behavior occurs. It is mainly reflected in the migration of polyester and other chemical fiber fabrics, but also other raw materials.
Color transfer is mainly due to two reasons: First, dye transfer occurs, especially disperse and reactive dyes.Floating colors and dyes migrating out of fibers may dye the fibers on the surface of another sample; especially dark colors dyeing light colors may remain on the surface of another sample in the form of particles or imprints. The second is that the fibers fell off under the action of friction and were transferred from one sample to another sample.
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