1.手感及目测法:此方法适用于纤维松散状态的无纺布原料。

　　(1) Cotton fiber is shorter and thinner than ramie fiber and other hemp fiber and wool fiber, and it is often accompanied by various impurities and defects.

　　 (2), hemp fiber has a rougher hand.

　　(3), the wool fiber is curled and elastic.

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

　　(5). Among chemical fibers, only viscose fiber has a large difference in strength between 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.微观观察方法：它是基于纤维的纵向和横截面形态特征识别无纺布纤维。

　　 (1), cotton fiber: cross-sectional shape: round waist with middle waist; longitudinal shape: flat ribbon shape with natural twist.

　　 (2), hemp (ramie, flax, jute) fiber: cross-sectional shape: round or polygonal waist, with a middle cavity; longitudinal shape: horizontal nodes, vertical lines.

　　 (3), wool fiber: cross-sectional shape: round or approximately round, some with hair pith; longitudinal shape: scales on the surface.

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

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

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

　　 (7), rich and strong fiber: cross-sectional shape: less tooth shape, or round, oval; longitudinal shape: smooth surface.

　　(8), acetate fiber: cross-sectional shape: trilobal or irregular zigzag; longitudinal shape: longitudinal stripes on the surface.

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

　　(10) Chlorine fiber: cross-sectional shape: close to circular; longitudinal 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 fibers: cross-sectional shape: round or special shape; longitudinal shape: smooth.

　　 (13), vinylon fiber: cross-sectional shape: round waist, skin-core structure; longitudinal shape: 1 to 2 grooves.