Classification of fiber
(1) Cotton fiber: cross-sectional shape: round waist, with mid-waist. Longitudinal shape: flat belt-shaped, with natural twist.
(2) Linen (ramie, flax, jute) fiber: cross-sectional shape: waist-round or polygonal, with a central cavity. Longitudinal shape: horizontal knots and vertical lines.
(3) Wool fiber: Cross-sectional shape: round or nearly round, some have marrow. Longitudinal shape: scales on the surface.
(4) Rabbit hair fiber: cross-sectional shape: dumbbell shape, with marrow. Longitudinal shape: scales on the surface.
(5) Mulberry silk fiber: Cross-sectional shape: irregular triangle Longitudinal shape: smooth and straight, with longitudinal stripes.
(6) Ordinary viscose fiber: cross-sectional shape: zigzag shape, longitudinal shape of sheath-core structure: longitudinal grooves.
(7) Rich and strong fiber: Cross-sectional shape: less tooth-shaped, or round, oval Longitudinal shape: smooth surface.
(8) Acetate fiber: cross-sectional shape: trilobal or irregular zigzag vertical shape: longitudinal stripes on the surface.
(9) Acrylic fiber: Cross-sectional shape: round, dumbbell-shaped or leaf-shaped Longitudinal shape: smooth or striped surface.
(10) Polypropylene fiber: Cross-sectional shape: nearly circular Longitudinal shape: smooth surface.
(11) Spandex fiber: cross-sectional shape: irregular shape, including round, potato-shaped longitudinal shape: dark surface with unclear bone-shaped stripes.
(12) Polyester, nylon, polypropylene fiber: cross-sectional shape: round or special-shaped longitudinal shape: smooth.
(13) Vinyl fiber: cross-sectional shape: round waist, longitudinal shape of skin-core structure: 1~2 grooves.
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