Carded sliver contains more short fibers and neps impurities, and the straightness, parallelism and separation of fibers are not enough, so it is difficult to meet the spinning requirements of high-grade textiles. For this reason, textiles with higher quality requirements must use yarns spun through a combed spinning system. In addition, some special-purpose yarns are mostly combed yarns.
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The quality of wool used in the navy fabric is slightly lower than that of Melton, and sometimes the navy is classified as a uniform, but it is the best variety in the uniform. The appearance is somewhat similar to Melton, only the raw materials and dyeing and finishing processes are different.
How is color fastness rated? Most of the current color fastness test methods are simulated tests or comprehensive tests according to the environment and conditions of the action, and the fastness grades are evaluated according to the discoloration of the samples after the test and (or) the staining of the lining fabric.
In the rating of color fastness, it is necessary to comprehensively evaluate the changes of the three attributes of color, that is, the changes of hue, lightness and purity.