Method one hand feeling visual measurement method (this method is suitable for textile raw materials in loose fiber state)
(1) Cotton fiber is shorter and thinner than ramie fiber and other process fiber and wool fiber, often with various impurities and defects.
(2) Hemp fiber feels rough and hard.
(3) Wool fibers are curly and elastic.
(4) Silk is filament, long and thin, with special luster
(5) Among the chemical fibers, only viscose fiber has great difference in dry and wet strength.
(6) Spandex is very elastic and can stretch to more than five times its length at room temperature.
Method 2 fluorescence method
The ultraviolet fluorescent lamp is used to irradiate the fiber, and the fiber is identified according to the different luminescent properties and the different fluorescent color of the fiber. The fluorescent colors of various fibers are as follows:
(1) Cotton and wool fiber: light yellow
(2) Mercerized cotton: light red
(3) Jute fiber: purple brown
(4) Jute, silk and nylon: light blue
(5) Viscose fiber: white purple shadow
(6) Bright viscose fiber: light yellow purple shadow
(7) Polyester fiber: white light, bright blue sky
(8) Vinylon bright fiber: light yellow purple shadow
Methods three microscope observation
(1) Cotton fiber: cross section shape: waist round, with cavity; Longitudinal shape: flat belt, with natural curve.
(2) Ramie (ramie, flax, jute) fiber: cross section shape: waist round or polygonal, with a cavity; Longitudinal shape: transverse section and vertical grain.
(3) Wool fiber: cross section shape: round or nearly round, some with pith; Longitudinal shape: there are scales on the surface.
(4) Rabbit hair fiber: cross section shape: dumbbell shaped, with pith; Longitudinal shape: there are scales on the surface.
(5) Silk fiber: cross section shape: irregular triangle; Longitudinal shape: smooth and straight, longitudinal stripe.
(6) Ordinary viscose fiber: cross section shape: serrated, skin core structure; Longitudinal shape: longitudinal groove.
(7) Rich and strong fiber: cross section shape: less teeth, or round, oval; Longitudinal shape: smooth surface.
(8) Acetate fiber: cross section shape: trilobal or irregular serrated; Longitudinal shape: there are longitudinal stripes on the surface.
