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.
2. Combustion properties of common fibers:
Fiber: Near-flame phenomenon in the flame, smell, ash, and sputum after the flame;
Cotton: near-flame burning, afterburning with afterglow, burning paper, ash is rare, soft, black, gray;
Hair: melted away from the flame and burned, difficult to continue burning, self-extinguishing, singeing, brittle, brittle, fluffy, black;
Silk: melted away from the flame, difficult to continue burning, self-extinguishing, singeing, brittle, brittle, fluffy, black;
Polyester: near flame melting, dripping, foaming, continuous burning, weak aroma, hard round, black, light brown;
Acrylic: melting near flame, melting and burning, fast burning splash, weak fragrance, hard round, irregular or beaded.
3 fiber calculation method
1 fixed length system:
A. Turks: The weight of a 1000 m length yarn at a given moisture regain rate is called a special number.
Where: G is the weight of the yarn (grams), and L is the length of the yarn (meters)
B. Denier: The weight of a 9000 meter long wire at a given moisture regain rate is called the denier.
Where: G is the weight of the wire (g), L is the length of the wire (m)
A. Male count (public branch): The length of the meter in 1 gram of yarn (silk).
Where: 1 is the length of the yarn (wire) (meter), and G is the weight of the yarn (wire) (g)
B. British count (British): The number of 840 yards of a pound of yarn.
Where: L is the length (code) of the yarn (wire) and G is the weight (in pounds) of the yarn (wire).
4. Common raw materials for bedding selection
1 Pure cotton yarn: 36TEX (16S), 28TEX (21S), 18Ã—2TEX32S/2) 15TEX 40S), 14Ã—2TEX (42S/2), 10Ã—2TEX (60S/2)
2 Polyester cotton yarn: 20TEX (30XS), 15TEX (40S), 13TEX (4/S)
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