Dyeing Colorfastness
Colorfastness is also known as dyeing fastness or dyeing firmness. It refers to the resistance of the color of textiles to various effects during processing and use.
According to the specimen discoloration and undyed lining fabric color staining to assess the level of fastness. Textile color fastness test is a regular test item in textile internal quality test.
Textiles in its use will be subjected to light, washing, ironing, sweat, friction, chemicals, and other external effects, some printed and dyed textiles are also after a special finishing process, such as resin finishing, flame retardant finishing, sand washing, brushing, etc., which requires that printed and dyed textiles color relative to maintain a certain degree of fastness.
Colorfastness
Colorfastness is referred to as color fastness; of colored fibers, fabrics, or other coloring matter color, in the processing and use of the process of discussing suffered sunlight, washing, friction, perspiration, and other kinds of erosion resistance.
The rating of color fastness, in addition to light fastness to old sunlight) fastness for the R level and the other 5 levels. The higher the level, the better the color fastness. The leather measurement method has faded (leather itself color changes) and staining l on contact with two kinds of staining.
The fade test is a leather sample according to the prescribed conditions after treatment, the sample and untreated test sample uu between the color difference, to standard gray sample card comparison level. The staining test is the specimen and standard white cloth according to the specified conditions according to the touch, white cloth by the specimen color transfer put dyeing to determine the degree of grey staining sample card to measure the grading.
ColorStaining Fastness
Garments composed of different color parts, in storage sometimes occur from one area to another area of the migration of dyes, usually from the dark part to the light part of the migration, this phenomenon is different from sublimation, because it is below the sublimation temperature, and non-sublimation dyes can also occur this phenomenon. It is mainly reflected in the migration of chemical fiber fabrics such as polyester, and other raw materials as well.
The color transfer is mainly due to two reasons: First, the dyes are transferred, especially the floating color of dispersed and reactive dyes, and the dyes migrate and free out of the fibers, which may dye the fibers on the surface of another kind of sample; especially the dark color is dyed on the lighter color, so as to stay on the surface of another sample in the form of granule and embossing. Secondly, fiber shedding occurs under the action of friction and is transferred from one sample to another.
