Before analyzing the textile color fastness test standards, let's first understand what is a textile color fastness tester?
Color Fastness Tester
ist widely used in the textile industry to test colour fastness of textiles particularly, printer fabrics to dry or wet rubbing. The primary function of the crockmeter is to examine colorfastness of fabrics to crocking, that is, the rubbing off of dyes from a fabric surface onto another surface.
Textile color fastness, also called dye fastness, refers to the ability of colored textile products to resist various external effects without changing color. It is usually expressed in two ways: color change grade and staining grade (except for light fastness). The color change grade represents the brightness (darkness), saturation (brilliance) and hue (shade) of the color of the sample after treatment. The degree of change in the aspect; the staining grade indicates the degree of contamination of the adjacent fabric by the sample during the treatment. The higher the discoloration grade and staining grade, the better the color fastness, which means that the textiles have a stronger ability to resist discoloration or staining. The most basic color fastness items are: resistance to rubbing, washing, perspiration, saliva, sunlight, water, ironing, bleaching, light and sweat, and so on.
Textiles use dyes, finishing agents and various processing aids and other chemicals in the printing and dyeing process, and many other substances are harmful to the human body. In the process of use, textiles will be exposed to various external effects such as light, washing, ironing, perspiration and chemical agents. If the color fastness is poor, on the one hand, some dyes or finishing agents will be affected by human sweat and saliva protein. It is decomposed or reduced to harmful groups under the action of biocatalysis, absorbed by the body, and accumulated in the body will cause harm to human health; on the other hand, it will fall off due to poor color fastness during the dyeing process or when consumers use washing. Dyestuffs and finishing agents from the waste water are discharged into the rivers, which will also have an adverse impact on the environment. Therefore, the color fastness of textiles is not only an important quality index, but also an important ecological technical index.
Ecological and environmental protection requirements:
In recent years, in the international textile and clothing trade, in addition to ensuring the quality of the product, the requirements for color fastness have also been continuously paying attention to its safety and environmental protection. At present, various countries use laws, regulations, standards and other forms to continuously propose new limit indicators for harmful substances in textiles related to human health and environmental protection. Color fastness is one of them. The requirements of the International Textile Association standards for color fastness are: Water resistance, sweat resistance, dry friction resistance and saliva resistance. The color fastness required by the EU Eco-Textile Mark has increased the color fastness to wet rubbing and sunlight on the basis of the International Textile Association standard.
Three attributes of color:
Hue: The appearance of the color is the quantity that represents the color attribute.
Saturation: Also known as saturation, it refers to the purity of the color. Related to the vividness of the color.
Brightness: Also known as brightness, it indicates the strength of the light reflected on the surface of a colored object. Related to the intensity of the color.
Textile color fastness test steps:
1. The type of lining fabric
Single fiber lining:
Wool, cotton and viscose, polyamide, polyester, polyacrylonitrile, silk fiber.
General rules of textile color fastness test: acetate fiber, bleached cotton, polyamide fiber, polyester fiber, polyacrylonitrile fiber, wool
General rules of textile color fastness test:
2. The size and use of the lining fabric
Two pieces of single fiber lining:
The first piece is made of the same fiber of the sample,
The second piece is specified in accordance with the test method. If the sample is a blended or interwoven fabric, the first piece is made with the main content of fiber. The second piece is made of fibers with a minor content. Each side of the sample is completely covered with a lining fabric. The size is the same as the sample, generally 40 (mm) X100 (mm) .
A piece of multi-fiber lining:
Cover only the front side of the sample. The size is the same as the sample, which is also 40 (mm) X100 (mm) .
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