Second, the identification of fiber
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, 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 difference in melting point, specific gravity, refractive index, and solubility of the fiber is 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.
2,Combustion properties of common fibers:
fiber
Near flame phenomenon
In the flame
After the flame
odor
Ash
cotton
Near flame
combustion
Afterburning
Burning paper
Very low ash, soft black ash
hair
Melting flame
Melt and burn
Difficult to burn self-extinguishing
Singeing
Fragile, crisp, fluffy, black
wire
Melting flame
Silk sound
Difficult to burn self-extinguishing
Singeing
Fragile, crisp, fluffy, black
Polyester
Near flame melting
Dripping
Foaming
Weak fragrance
Hard round black hazel
Acrylic
Melting near flame
Melt and burn
Fast burning splash
Weak fragrance
Hard circle irregular or bead