(1) The identification methods include hand feeling, visual measurement, combustion, microscopy, dissolution, drug coloring and infrared spectroscopy. In practical identification, it is often necessary to use a variety of methods to synthetically analyze and study the results.
(2) The general identification steps are as follows:
①Firstly, natural fibers and chemical fibers were identified by combustion method.
②If natural fibers are used, plant fibers and animal fibers are identified by microscopic observation. If chemical fibers are used, the differences in melting point, specific gravity, refractive index and solubility of the fibers are distinguished one by one.
③When identifying blended fibers and blended yarns, it is generally possible to identify several fibers by microscopic observation, and then identify them one by one with appropriate methods.
④For dyed or finished fibers, dyeing peeling or other appropriate pretreatment is generally necessary to ensure the reliable identification results.