The color fastness is good or poor, directly related to the health and safety of the human body. When wearing products with poor color fastness, rain and sweat will cause the pigment on the fabric to fall off and fade. The dye molecules and heavy metal ions are all It is possible for the skin to be absorbed by the body and endanger the health of the human skin. On the other hand, it can also affect the staining of other clothes worn on the body or stain other clothes when washing with other clothes.
Testing Method:
The sample is stitched with the standard lining fabric, washed, washed and dried, and washed under appropriate temperature, alkalinity, bleaching and rubbing conditions, so that the test results can be obtained in a shorter time. The friction between them is accomplished by a small bath ratio and the appropriate number of stainless steel balls rolling and impacting, and the gray card is used to grade and the test results are obtained.
Impact Of Test Methods
(1) The temperature range, the higher the washing temperature, the easier it is to fade, and the lower the color fastness, so please choose the appropriate washing temperature, but it will cause poor test results.
(2) Detergents, phosphate-based detergents easily dissolve dyes containing phosphate groups. However, general laboratories have standard detergents.
(3) Mechanical effects, roller speed during testing, size and number of steel balls will all affect.
(4) The hardness of water, high hardness water not only easily causes clothes to harden, the precipitated calcium carbonate and higher fatty acid calcium will also cover the original color of the dye.
(5) Organic matter in the water and residual chlorine, etc. The organic matter may cause the dye to dissolve and accelerate the oxidation of the dye. Residual chlorine will oxidize the dye and cause discoloration.
(6) Wash, dry or reduce the sample according to the washing method. Different reduction methods will have a certain effect on the fabric. The best is to vacuum dry, but the price will be very expensive.
