Fiber thickness and milligram root count are two common indicators in fiber properties, and their determination methods are as follows:
Method for Determination of Fiber Coarseness
Fiber thickness refers to the diameter or cross-sectional area of the fiber, usually expressed by the mass per unit length (such as mg/m). There are many methods for measuring fiber thickness, among which the commonly used methods are laser particle size analysis and microscope image analysis. Among them, the laser particle size analysis method is to disperse the fiber sample through a laser particle size analyzer, and use the principle of laser scattering to measure the diameter of the fiber, so as to obtain the fiber thickness. The microscope image analysis method is to observe the shape and size of the fiber section through a microscope, and use image analysis software to process and measure the fiber thickness.
Determination method of milligram roots
The number of milligrams refers to the mass of fiber per unit length, usually expressed in mg/m. The method for determining the number of milligrams is to weigh the fiber sample and calculate its mass per unit length. The commonly used methods are the suspension method and the zona pellucida method. Among them, the suspension method is to suspend the fiber sample in water, measure the fiber mass and fiber length per unit length, and calculate the number of milligram roots. The transparent tape method is to paste the fiber sample on the transparent tape, then put the tape on the millimeter paper, measure the length of the fiber and the length on the tape, and then calculate the number of milligrams.
Quality factor is an important index to evaluate the quality of fiber, and it is usually used in the selection and optimization of textile raw materials and spinning process. Its calculation formula is: quality factor = milligram root number / fiber thickness. The larger the quality factor, the better the fiber quality and the wider the scope of application. For example, the quality factor of cotton is generally between 3.5 and 5, while the quality factor of good long-staple cotton can reach more than 6.
