Microscopic observation: Fibers are identified based on the longitudinal and cross-sectional features of the fibers. (1), cotton fiber: cross-sectional shape: waist round, with a middle waist; vertical shape: flat ribbon, with natural rotation. (2), hemp (ramie, flax, jute) fiber: cross-sectional shape: waist round or polygonal, with a middle cavity; vertical surface shape: there are horizontal sections, vertical lines. (3), wool fiber: cross-sectional shape: round or nearly round, some have a pulp; vertical form: the surface has scales. (4), rabbit hair fiber: cross-sectional shape: dumbbell type, with pulp; vertical form: surface has scales. (5), mulberry silk fiber: cross-sectional shape: irregular triangle; vertical surface shape: smooth and straight, longitudinal stripes. (6), ordinary viscose: cross-sectional shape: zigzag, sheath core structure; vertical shape: longitudinal grooves. (7), rich and strong fiber: cross-sectional shape: less tooth shape, or round, oval; vertical form: smooth surface. (8), acetate fiber: cross-sectional morphology: trilobal or irregular zigzag; longitudinal morphology: the surface has vertical stripes. (9) Acrylic fiber: cross-sectional shape: round, dumbbell-shaped or leaf-like; longitudinal shape: smooth or streaked surface. (10), polyvinyl chloride fiber: cross-sectional shape: close to a circle; vertical form: smooth surface. (11), spandex fiber: cross-sectional shape: irregular shape, round, potato-shaped; vertical surface shape: dark dark surface, unclear bone-shaped stripes. (12), polyester, nylon, polypropylene fiber: cross-sectional shape: round or shaped; vertical form: smooth. (13), vinylon fiber: cross-sectional shape: waist round, sheath core structure; vertical surface shape: 1~2 grooves.
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