What are the intrinsic quality indicators of cotton fiber? Do textiles must understand!

The fiber length refers to the distance between the two ends of the fiber. Fiber lengths have different methods of measurement. The length measured by the hand-pulling ruler method is called hand pull length; the length measured by the splitting method is called the length of the splitting comb; the length measured by the cotton fiber photoelectric length meter is called the photoelectric length; measured by a large-capacity fiber analyzer The length of the span is called the span length. Commonly used is the span length of 2.5%, or 2.5% fiber span length. Under normal circumstances, the carding length>hand pull length,optical length>2.5% fiber span length. The length of the cotton fiber is closely related to the yarn strength. Longer fiber spinning will increase the cohesion length between the fibers. When the yarn is subjected to external force, the fiber is not easy to slip off and the yarn strength is high.

Cotton fiber fineness refers to the degree of fiber thickness, and its direct meaning is the diameter of the fiber cells. Because the diameter of the cotton fiber is difficult to measure directly, and the weight of the cotton yarn is measured mainly by its fineness, ie, the length per unit weight, the fineness of the fiber is often used to describe the thickness of the fiber. Nowadays, the fineness of the fibers is determined by a common air flow meter. That is, by using the principle of air flow, the specific surface area of ​​the fibers is rapidly determined, and the fineness of the fibers is estimated therefrom, which is represented by the micronaire value. Fiber fineness and yarn strength are closely related. Because the cotton yarn is formed by the cohesion of multiple fibers, the strength of the yarn is high and low, in addition to the strength of the fiber itself, the number of fibers in the fineness of the unit yarn, and the number of fibers. The degree of relative slip is related to the evenness of the strips. Spinning high count yarn can only use raw cotton with long fiber and good fineness.

Cotton fiber strength refers to the strength of the cotton fiber against tensile fracture. When other indicators are basically the same, the fiber strength is positively related to yarn and cloth quality. In the case of high spinning speeds of modern spinning equipment, the high fiber strength plays an important role in reducing the yarn breakage in spinning and improving the production efficiency.

Cotton fiber maturity is an important indicator reflecting the thickening of the cell wall. In the case of similar fiber cell diameter, the thicker the cell wall, the higher the maturity. The fineness, micronaire value, strength and dyeing characteristics of cotton fiber are closely related to maturity.

High-quality raw cotton fiber requires that all major physical performance indicators must be coordinated, that is, the length, strength, fineness, and uniformity of the fibers must be matched with each other. Individual indicators do not represent good overall quality.