1, the identification method:
1 The methods of identification are touch, visual inspection, combustion, microscopy, dissolution, drug coloring, and infrared spectroscopy. In the actual identification, often need to use a variety of methods, comprehensive analysis and research after the results.
2 The general procedure for identification is as follows:
A. First identify the natural fibers and chemical fibers by the combustion method.
B. In the case of natural fibers, microscopic observations are used to identify various plant fibers and animal fibers. If it is a chemical fiber, the difference in melting point, specific gravity, refractive index, and dissolution performance of the combined fiber is distinguished one by one.
C. In the identification of mixed fibers and blended yarns, it is generally confirmed by microscopic observation that several kinds of fibers are contained therein, and then identified one by one by an appropriate method.
D. For dyed or finished fibers, dye stripping or other appropriate pretreatments are generally required before reliable identification can be guaranteed.
1) Cotton, hemp, viscose, copper-ammonia fiber: close to the flame: not shrink; in contact with the flame: rapid combustion; leave the flame: continue to burn; odor: burn paper odor; residue characteristics: a small amount of gray or gray ashes .
(2), silk, wool fiber: close to the flame: curl and melt; contact flame: curl, melt, burn; leave the flame: slow combustion sometimes self extinguishing; odor: burning hair odor; residue characteristics: loose and brittle black particles Or coke-like.
(3) Polyester fiber: close to the flame: condense; contact the flame: melting, smoking, slow burning; leave the flame: continue to burn, sometimes self-extinguishing; odor: special aromatic sweetness; residue characteristics: hard black ball .
(4), nylon fiber: close to the flame: melting; contact flame: melting, smoking; leaving the flame: self-extinguishing; odor: amino taste; residue characteristics: hard pale brown transparent beads.
(5) Acrylic fiber: close to the flame: melting; contact with the flame: melting, smoking; leaving the flame: continue burning, black smoke; smell: spicy taste; residue characteristics: black irregular beads, fragile.
(6) Polypropylene fiber: close to the flame: fused; contact flame: melting, burning; leaving the flame: continuing to burn; odor: paraffin wax; residue characteristics: gray hard transparent beads.
(7) Spandex fiber: close to the flame: condense; contact the flame: melting, burning; leaving the flame: self-extinguishing; odor: specific taste; residue features: white gelatinous.
(8) Chlorophyll fiber: close to the flame: condense; contact flame: melting, burning, black smoke; leaving the flame: self extinguishing; odor: pungent odor; residue characteristics: dark brown lump.
(9), vinylon fiber: close to the flame: melting; contact flame: melting, burning; leaving the flame: continue burning, black smoke; odor: unique flavor; residue characteristics: irregular brown brown hard coke.