Recently, unqualified news in the spot checks across the country has been frightened. These garments do not meet the requirements of the standard and relate to items such as PH value, perspiration fastness, dry rub fastness, and water fastness. These non-compliance items are all about color fastness. What is color fastness in the end?
Color fastness refers to the resistance of a textile 's color to various effects during processing and use. The fastness grade was evaluated based on the discoloration of the sample and the coloration of the undyed lining fabric . Textile color fastness testing is a routine test item in the intrinsic quality testing of textiles.
Color wash fastness : the sample is sewn together with a standard lining fabric, washed, washed and dried, and washed at a suitable temperature, alkalinity, bleaching and rubbing conditions to obtain the test result in a shorter time . The friction between them was achieved through the small bath ratio and the rolling and impact of a suitable number of stainless steel beads. The gray card was used for rating and the test results were obtained. Different test methods have different temperatures, alkalinity, bleaching and rubbing conditions and sample size, and specific selections should be made according to test standards and customer requirements. Generally washed with poor color fastness cuilan, brilliant blue, black red, navy and so on.
Color fastness to dry cleaning : the same as the color fastness to washing, but it was changed from dry to dry.
Color fastness to rubbing : The sample was placed on a rubbing fastness meter and rubbed with a standard rubbing white cloth for a certain number of times at a certain pressure. Each set of samples was required to have dry rubbing fastness and wet rubbing fastness. The color on the standard rubbing white cloth was rated with a gray card, and the resulting series was the measured rubbing fastness. The color fastness to rubbing requires two tests: dry rubbing and wet rubbing. All colors on the sample must be rubbed.
Color fastness to sunlight: textiles typically used when exposed to light, the light damage resulting dye known as "fading", cause discoloration of colored textiles, generally shallow, dark, there will be some shade change, so , we need to test the color fastness, and the sun color fastness test is to put the sample under the specified conditions with the blue wool standard cloth with different fastness levels for solar exposure, and the sample with blue wool. The cloths were compared and the light fastness was evaluated. The higher the blue wool standard cloth number, the lightfast.
Perspiration fastness : The sample and standard lining fabrics were sewn together and placed in perspiration solution. They were placed on a perspiration-resistant color fastness meter, placed in an oven at a constant temperature, then dried and rated with a grey card. Get the test results. Different test methods have different perspiration ratios, different sample sizes, different test temperatures and times.
Color fastness to water stains : Test specimens treated with water as above.
Chlorine bleaching fastness : After the fabric is washed in a chlorine bleach solution under certain conditions, the degree of color change is evaluated. This is the chlorine bleaching fastness.
Non-chlorine bleaching fastness : After the fabric was washed with non-chlorine bleaching washing conditions, the degree of color change was evaluated, which is the non-chlorine bleaching fastness.
Color fastness to pressing : After the dry sample is covered with a cotton lining fabric, it is pressed in a heating device of a specified temperature and pressure for a certain period of time, and then the color change of the sample and the stain of the lining fabric are evaluated with a gray sample card. Hot press color fastness is dry pressure, moisture pressure, wet pressure, according to different customer requirements and test standards, select the test method.
Corresponding standard
Washing
ISO 105 C06: 1994 / Cor.2: 2002 (E): Test of color fastness Part C06: resistance to domestic and commercial laundering color fastness
BS EN ISO 105-C06: 1997 : Test of color fastness Part C06: Color fastness to domestic and commercial laundering of
Dry cleaning
ISO105 D01:1993/BS EN ISO105 D01:1995: Textiles - Tests for colour fastness - Colour fastness to dry cleaning
Water resistant
ISO 105 E01: 1994/Cor.1:2002(E): Textiles - Tests for colour fastness - Colour fastness to water
GB/T 5713:1997: Textiles - Tests for colour fastness - Colour fastness to water
Seawater resistant
ISO 105 E02: 1994/Cor.1:2002(E): Colour fastness test of textiles against seawater colour fastness
GBT 5714:1997: Textiles - Tests for colour fastness - Colour fastness to seawater
Sweat stain
ISO 105 E04: 1994/Cor.1:2002(E): Textiles - Tests for colour fastness - Colour fastness to perspiration
GBT 3922:1995 : Textiles - Tests for colour fastness - Colour fastness to perspiration
Dry heat resistance
ISO 105 P01: 1993: Tests for colour fastness to textiles Resistance to dry heat ( other than heat press ) Colour fastness
BS EN ISO 105-P01: 1995: Tests for colour fastness to textiles against dry heat ( other than heat press ) colour fastness
friction
BS1006 X12:1990: Textiles - Tests for colour fastness - Colour fastness to rubbing
EN ISO105 X12:2002: Textiles - Tests for colour fastness - Colour fastness to rubbing
GB/T 3920: 2008: Tests for colour fastness to textiles Colour fastness to rubbing
Heat pressure
BS EN ISO 105 X11: 1996: Textiles - Tests for colour fastness - Colour fastness to heat and pressure
Light
GB/T8427-1998 textiles resistant to artificial light fastness
other information
Type of color fastness test
The nature or extent of the variation in the staining state can be expressed as the color fastness. The color fastness of fabrics is related to the type of fiber, yarn structure, fabric structure, printing and dyeing methods, dye type and external force. The color fastness test generally includes light fastness, weather fastness, wash fastness, rub fastness, perspiration fastness, etc., sometimes depending on different textiles or different use environments. Special requirements for color fastness. When the color fastness test is generally performed, it is the degree of discoloration of the dyed material and the degree of staining of the lining material. The color fastness is rated. In addition to the light fastness of the eighth grade, the rest are all five levels. The higher the number of stages, the better the color fastness.
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1. Light fastness: Light fastness refers to the degree of discoloration of a fabric that is colored by sunlight. The test method is to simulate the degree of fading of the sample after the sunlight exposure and the standard color sample, and it is divided into 8 grades. The grade 8 is the best grade and the grade 1 is the worst. Fabrics with poor light fastness should not be exposed to sunlight for a long time and should be dried in a ventilated place.
2. Washing fastness: Washing or soaping fastness refers to the degree of color change after the dyed fabric is washed with the washing solution. Gray graded sample cards are usually used as the evaluation criteria, that is, the color difference between the original sample and the sample after fading is used for evaluation. Washing fastness is divided into 5 levels, 5 is the best and 1 is the worst. The fabrics with poor washing fastness should be dry-cleaned. If the wet-cleaning is performed, the washing conditions need to be doubled, such as the washing temperature cannot be too high and the time cannot be too long.
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