Classification of color fastness

In the quality inspection of textile color fastness, rubbing color fastness is one of the very important inspection items, and the test result is directly related to the overall color fastness of the fabric. Because some dyes with poor color fastness can cause different degrees of harm to the human body, different standards bodies and countries have formulated standards for this, strictly limiting the color fastness levels of clothing and home textiles.

Color fastness refers to the resistance of the color of textiles to various effects during processing and use. There are many specific subdivision indexes. The fastness level can be assessed according to the discoloration of the sample and the staining of the undyed lining fabric. . Textile color fastness test is a routine test item in the internal quality test of textiles. Unqualified textile color fastness can cause harm to human body.

Color fastness to rubbing After rubbing the sample with a dry or wet rubbing cloth or brush, use a gray scale to evaluate the staining or discoloration of the rubbing cloth or sample. Test of color fastness to dry and wet rubbing and scrubbing rubbing of fabrics.

Color fastness (Color fastness) is also called color fastness, dye fastness. It refers to the resistance of the color of textiles to various effects during processing and use. The fastness grade is evaluated according to the discoloration of the sample and the staining of the undyed lining fabric. Textile color fastness test is a routine test item in the internal quality test of textiles.

During its use, textiles will be exposed to various external effects such as light, washing, ironing, perspiration, friction and chemical agents. Some printed and dyed textiles are also subjected to special finishing processes, such as resin finishing, flame retardant finishing, sand washing, and grinding. This requires the color and luster of printed and dyed textiles to maintain a certain degree of fastness. The color fastness is good or bad, which directly relates to the health and safety of the human body. During the wearing process, the product with poor color fastness will cause the pigment on the fabric to fall off and fade when it encounters rain or sweat. The dye molecules and heavy metal ions are all It may be absorbed by the human body through the skin and endanger the health of the human skin. On the other hand, it may also affect other clothing worn on the body to be stained, or stain other clothing when washed with other clothing.

The dye fastness of the fabric is related to the type of fiber, yarn structure, fabric structure, printing and dyeing method, dye type and external force. The color fastness test generally includes light fastness, weather fastness, washing fastness, rubbing fastness, perspiration fastness, etc. Sometimes there are some according to different textiles or different use environments. Color fastness for special requirements. The color fastness test is usually based on the degree of discoloration of the dyed material and the degree of staining on the lining. The color fastness is graded. Except for the light fastness of eight, the rest are all five. The higher the grade, the better the color fastness.