Fabric Washing Colorfastness Tester Principles and Standards
Washing colorfastness refers to the change in color of colored fabrics after washing while worn. The degree of soiling and the degree of soiling by other fibers are also called soap color fastness. Among the color fastness tests of many textiles, the washing color fastness test is one of the most common and important evaluation items to measure the quality of textiles, and has attracted the attention of most buyers in actual production and trade.
As a routine project, the washing color fastness test itself is not complicated, but the key point is that for companies, customers come from different levels, and products are sold to countries around the world in different varieties, different uses and complicated quality assessment The quality checkg department of the factory may not necessarily have multiple sets of different product testing method standards at the same time, or although there are multiple sets of product testing method standards, it may not be able to equip testing equipment with different standards at the same time.
Principle of fastness to washing
In ordinary soaping, the textile sample is sewn together with one or two pieces of specified standard subsidiary fabrics, placed in soapy water or mixed with solution of anhydrous sodium carbonate, mechanical stirring during the specified time and under mild conditions, and then wash and dry. Using the original as a reference sample, use a gray sample card or an instrument to assess the discoloration of the sample and the soiling of the adjacent fabric.
For household and commercial laundry (rapid procedure), the test sample with the specifiedflat standard side fabrics or other fabrics are sewn, washed, rinsed and dried, washing under the appropriate temperature, alkalinity, bleaching and rubbing conditions under low bath percentage, and the rubbing effect is achieved by low bath percentage and appropriate number of stainless steel beads generated so that the result can be achieved in a short time. The gray scale is used to assess sample discoloration and contamination of the standard adjacent fabric.
Comparison of color fastness to washing test standards
The color fastness to washing test refers to the degree of fading of colored fabrics after washing under specified conditions, including two rating points: fading of the original color and staining on white Material. Original color fading refers to the fading of the color of colored fabrics (patterns) before and after washing; whitee Cloth stain means that white cloth and colored textile (pattern) are sewn together in a certain way after washing, because the colored textile (pattern) When the color fades and stains the white cloth. The degree of fading and soiling should be tested under the specified light source and rated on the standard gray scale divided into 5 levels. Level 5 is the best and level 1 is the worst. At present, there are relatively complete test methods and standards for this project at home and abroad, but the technical conditions of the devices are not the same.