Hand visual inspection method: This method is suitable for non-woven fabric materials in the state of dispersed fibers .

(1) Cotton fibers are short and thin, often accompanied by various impurities and defects.

(2) Hemp fiber feels rough and hard.

(3) The wool fiber is crimped and elastic.

(4) The silk is long and thin, with a special luster.

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

(6) Spandex fiber has great elasticity and can be extended to more than five times at room temperature.

2. Microscope observation method: Identify the non-woven fiber according to the morphological characteristics of the longitudinal and transverse cross-section of the fiber.

(1) Cotton fiber: cross-sectional shape: round waist with middle waist; longitudinal shape: flat ribbon shape with natural curvature.

(2) Hemp fiber: cross-sectional shape: round or polygonal waist, with middle cavity; longitudinal shape: horizontal nodes and vertical lines.

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

Rabbit hair fiber: cross-sectional shape: dumbbell-shaped, with hair pulp; 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 fiber: cross-sectional shape: zigzag shape, skin-core structure; longitudinal shape: longitudinal groove.

Rich and strong fiber: cross-sectional shape: less tooth shape, or round or elliptical; 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 cross-sectional shape: smooth surface.

(11) Spandex fiber: cross-sectional shape: irregular shape, round, potato shape; longitudinal shape: deep surface, unclear bones.

(12) Lun and polypropylene fibers: cross-sectional shape: round or special-shaped; longitudinal cross-sectional shape: smooth.

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