Color fastness to storage of textiles
For textiles composed of different colored parts, dyes sometimes migrate from one area to another during storage, usually from darker parts to lighter parts. This phenomenon is different from sublimation because it is at low temperature. Carry out at sublimation temperature. The color fastness of textiles refers to the ability of colored products to resist various external effects without changing color. The phenomenon of color migration is not only related to the color fastness of the textile itself, but also closely related to the material of the migrated material, related production processes, and environmental factors. Related. The phenomenon of dye migration during storage is particularly obvious for polyester coated fabrics.
Color fastness to storage test
1. Test equipment
It is composed of a pair of stainless steel frame and a weight of about 5kg with a weight of 115 mm × 60 mm on the bottom surface, and a glass plate or acrylic resin plate with a size of 115 mm × 60 mm × 1.5 mm; constant temperature and humidity device; spectrophotometry Color measuring instrument or colorimeter; gray sample card for evaluating discoloration; gray sample card for evaluating staining; multi-fiber lining fabric; non-dyed fabric; tertiary water.
2. Sample preparation
GB/T 32008-2015 and GB/T 22700-2008 both use the multi-fiber lining fabric DW required in GB/T 7568.7, while AATCC 163-2012 uses No.10 or white with the same composition as the sample Fabric. In addition, please refer to the table below for the size of the samples. It can be seen from the table that the GB/T 32008-2015 standard and GB/T 22700 have the same size requirements.
The GB/T 32008-2015 standard has more detailed requirements for sample preparation, including fabrics, yarns and loose fibers, as well as sample preparation methods for coated fabrics.
Appendix C of GB/T 22700-2008 is a normative appendix. Its test method refers to Method 1 of AATCC 163-2007. The use of multi-fiber and sample size are slightly different, and the test conditions and equipment are roughly similar. Compared with the GB/T 32008-2015 standard, it is more detailed.
Appendix C of GB/T 22700 only requires the use of a gray scale for staining to assess the staining grade of multi-fiber standard linings.
AATCC163 requires the use of AATCC stained gray card, AATCC 9-level stained color card or instrument rating to evaluate the staining of multi-fiber lining fabrics and white fabrics. If you notice the discoloration of the test sample, use the AATCC grayscale card or AATCC instrument rating Record the corresponding gray card level.
GB/T 32008 requires the use of gray sample cards or instrument ratings to evaluate the staining of multi-fiber lining fabrics and the discoloration grade of each sample, and specifically mentions the occurrence of adhesion, breakage, dry cracking or peeling off of the coated fabric. The discoloration grade may not be assessed, and it shall be stated in the test report.
Factors affecting dye migration during storage
1. During the storage of textiles, the environment of the warehouse is muggy or humid.
2. In the production of clothing, the steam-ironed clothing will have residual moisture, which will pile up semi-finished products together, plus dye transfer caused by the sultry air in the workshop.
3. The finished product is packaged directly before the moisture is dry, which is also a factor causing dye transfer.