1, identification method:
1 Identification methods include hand, visual, combustion, microscopy, dissolution, drug coloring, and infrared spectroscopy. In the actual identification, it is often necessary to use a variety of methods, comprehensive analysis and research to arrive at the results.
2 The general identification steps are as follows:
A. First, the natural and chemical fibers are identified by combustion.
B. If it is a natural fiber, microscopic observation is used to identify various plant fibers and animal fibers. If it is a chemical fiber, the differences in melting point, specific gravity, refractive index, and solubility of the fiber are distinguished one by one.
C. When identifying mixed fibers and blended yarns, it is generally confirmed by microscopic observation that several fibers are contained therein, and then identified one by one by an appropriate method.
D. For dyed or finished fibers, it is generally necessary to carry out dye stripping or other appropriate pretreatment to ensure reliable identification results.
1), cotton, hemp, viscose, copper ammonia fiber: close to the flame: no shrinking or melting; contact with the flame: rapid combustion; leaving the flame: continue to burn; smell: burning paper smell; residue characteristics: a small amount of gray or grayish gray ash .
(2), silk, wool fiber: close to the flame: curl and melt; contact flame: curl, melt, burn; leave the flame: slow burning sometimes self-extinguishing; smell: smell of burning hair; residue characteristics: loose and brittle black particles Or coke-like.
(3), polyester fiber: close to the flame: melting; contact with the flame: melting, smoking, slow burning; leaving the flame: continue to burn, sometimes self-extinguishing; smell: special aromatic sweet; residue characteristics: hard black beads .
(4), nylon fiber: close to the flame: melting; contact flame: melting, smoking; leaving the flame: self-extinguishing; smell: amino flavor; residue characteristics: hard light brown transparent beads.
(5) Acrylic fiber: close to the flame: melting; contact with flame: melting, smoking; leaving the flame: continue to burn, black smoke; smell: spicy taste; residue characteristics: black irregular beads, fragile.
(6), polypropylene fiber: close to the flame: melting; contact flame: melting, burning; leaving the flame: continue to burn; smell: paraffin flavor; residue characteristics: gray-white hard transparent beads.
(7), spandex fiber: close to the flame: melting; contact flame: melting, burning; leaving the flame: self-extinguishing; smell: specific taste; residue characteristics: white gelatinous.
(8), polyvinyl chloride fiber: close to the flame: melting; contact flame: melting, burning, black smoke; leaving the flame: self-extinguishing; smell: pungent smell; residue characteristics: dark brown lumps.
(9), vinylon fiber: close to the flame: melting; contact flame: melting, burning; leaving the flame: continue to burn, black smoke; smell: characteristic fragrance; residue characteristics: irregular focus brown lumps.
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