1. Hand-feeling visual inspection method: This method is suitable for non-woven raw materials in the state of loose fibers.

(1) Cotton fibers are shorter and thinner than ramie fibers and other hemp-based process fibers and wool fibers, often with various impurities and defects.

(2) Hemp fiber feels thick and hard.

(3) Wool fiber is curled and elastic.

(4) Silk is filament, long and slender, with special luster.

(5) Among the chemical fibers, only the viscose fiber has a large difference in strength in the dry and wet states.

(6) Spandex yarn has very large elasticity, and its length can be stretched to more than five times at room temperature.

2. Microscopic observation method: identify non-woven fibers based on the longitudinal and cross-sectional morphological characteristics of the fibers.

(1) Cotton fiber: cross-sectional shape: round waist, with a middle waist; vertical shape: flat ribbon, with natural twists.

(2) Hemp (ramie, flax, jute) fiber: cross-sectional shape: waist round or polygonal, with a cavity; vertical shape: cross-section, vertical lines

(3) Wool fiber: cross-sectional shape: round or nearly circular, some with pith; longitudinal shape: scales on the surface.

(4) Rabbit hair fiber: cross-section shape: dumbbell type, with hair pith; longitudinal shape: scales on the surface.

(5) Mulberry silk fiber: cross-sectional shape: irregular triangle; vertical shape: smooth and straight, with longitudinal stripes.

(6) Ordinary viscose fiber: cross-sectional shape: zigzag shape, skin-core structure; vertical shape: longitudinal grooves.

(7) Rich and strong fibers: cross-sectional shape: less tooth shape, or round, oval shape; vertical shape: smooth surface.

(8) Acetate fiber: cross-sectional shape: trilobal or irregular zigzag; vertical shape: vertical stripes on the surface.

(9) Acrylic fiber: cross-sectional shape: round, dumbbell-shaped or leaf-like; vertical shape: smooth or striped surface.

(10), chlorofiber: cross-sectional shape: nearly circular; vertical shape: smooth surface.

(11) Spandex fiber: cross-sectional shape: irregular shape, round, potato-shaped; longitudinal shape: dark and deep surface, showing unclear bone-shaped stripes.

(12) Polyester, Nylon, Polypropylene fiber: cross-sectional shape: round or shaped; vertical shape: smooth.

(13) Vinylon fiber: cross-sectional shape: waist-round, leather-core structure; vertical shape: 1 to 2 grooves.