The test methods of fiber fineness are divided into two categories according to their index characteristics. (1) Fiber diameter test: the cross-sectional shape is circular or approximately circular, and its equivalent diameter can be measured by the width method. Mainly include ①microscope projection magnification and width measurement, and divided into different tools: paper ruler grouping counting method, electronic ruler grouping counting method, camera manual adjustment automatic width measuring grouping counting method, CCD scanning automatic width measuring grouping counting method, etc.; ②One by one Root diameter conversion method according to the amount of shading (laser fiber diameter distribution analyzer, etc.); ③ fiber cross-section slice magnification measurement method; ④ airflow meter method: the use of different fiber fineness has different specific surface area, resulting in air flow resistance at a certain compression density Different methods are used to measure the average diameter; ⑤Acoustic attenuation method: Under certain compression conditions, the acoustic energy absorbed by the fiber resonance is related to the diameter, and the acoustic resonance absorption attenuation rate is used to convert the fiber diameter. (2) Fiber linear density test: ①Length measurement and weighing method: "Middle section cut weighing method" for short fibers (56 pages); ② Primary compressed air flow meter method; ③ Secondary compressed air flow meter method; the latter two use different methods The specific surface area of the fineness fiber is different, and the linear density of the fiber can be calculated even when the fiber cross section is not circular and hollow. ④ Vibration meter method: The natural frequency of the fiber under the condition of holding both ends is related to the linear density, and the linear density can be calculated by measuring the vibration frequency.

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