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中文版 英文版 Welcome to Laizhou Electronic Instrument Co., Ltd.! Chinese English

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  • The methods for detecting the fiber fineness are: ①Direct method: also called the mid-cut method, which cuts out the fiber bundles of fixed length and parallel straight, and calculates the metric count, denier or special number of the single fiber after weighing and counting the number of fibers. Only a few simple weighing instruments are needed. ② Indirect method: There are airflow method and sound pressure method. When air flow or sound wave passes through the quantitative aggregate fiber aggregate, the air pressure and sound pressure change, and the magnitude of the change varies with the thickness of the fiber. Generally, the thinner the fiber, the more the air pressure and sound pressure decrease. In the early 1950s, various types of air fineness meters made according to this principle appeared. In the future, China has developed a digital micro-pressure airflow fineness meter suitable for a variety of fibers. ③ Vibration method: A vibration method fineness meter designed based on the principle that the unit length mass of a fiber has a certain relationship with its natural frequency under a certain tension, can measure the fineness of a single fiber and filament, and can obtain the fineness variation coefficient. The fiber width tester detects the projected width of the fiber in the radial direction in the natural state. When the cross section of the fiber is circular, this width corresponds to the fiber diameter. Wool fiber uses diameter as the basis for quality evaluation. Fiber width or diameter is generally measured with a biological microscope or a projector, but it is cumbersome and inefficient. As a result, instruments for measuring fiber diameter using lasers have appeared. This instrument is designed based on the fiber scattered in the liquid flow, when the laser light passes through 1 millimeter, the amount of laser light scattering is proportional to the fiber diameter. With this instrument, the individual fiber diameter and its distribution can be determined.