Selection of fiber properties in the opener!!

After the fiber variety and blending ratio are matched, it is not enough to finally determine the actual performance of the product. The fiber length, fineness, strength, elongation and other properties have a direct impact on the performance of the product, and should also be considered in the selection of raw materials. The chemical fibers processed on the cotton spinning equipment of the opener are of two types: cotton type (1.5 denier × 38mm) and medium-long type (2--3 and x51,...,76mm). Using longer chemical fibers, the fiber strength utilization rate in the yarn is high, and the yarn strength is good. When chemical fibers are blended with cotton, the strength of the blended yarn is higher than that of pure cotton yarn because the length of the chemical fiber is greater than the length of the cotton fiber. According to the actual production data of the factory, when spinning medium-sized 65/35 polyester-cotton blended yarn, the polyester length increases from 35 mm to 38 mm, and its quality index can be improved by 200 points. In blended yarn, the finer the chemical fiber, the more fibers there are in the same yarn segment. But if the fiber is too fine, it is easy to produce cotton thread, and the fiber is easy to break, which reduces the quality of the yarn. The fineness of chemical fiber has a certain influence on the style of fabric. The thicker the fiber, the greater the stiffness and the better the fabric feel. In order to increase the wooly feel of the fabric, sometimes coarser fibers are selected. When chemical fiber is blended with cotton, the fineness of chemical fiber must be kept close to that of natural fiber, generally 1.5 denier. When spinning fine yarn, in order to improve the strength and evenness of the blended yarn, the fineness of chemical fiber is sometimes increased to 1.2 denier. When chemical fiber is purely blended, the fiber fineness is not limited by the fineness of natural fiber. The starting point to consider at this time is to meet the requirements of yarn strength and evenness. The fineness of chemical fiber is related to the number of spinnable fibers. The finer the fiber, the finer the number of spinnable fibers. For example, the number of spinnable fibers of 1.5mm and 38mm is 12, and the number of fibers of 2.5 denier is 51mm. It is 18 No. I3, and 65 mm fiber can be spun into No. 21. The relationship between fiber fineness and spinnable count is based on the small number of fiber segments in the yarn quilt. According to the current requirements for fine yarn, the number of fibers in the yarn segment is generally selected to be 60. When comparing fiber performance, the length and fineness of chemical fibers should have an appropriate ratio. The empirical formula is as follows: High fiber strength and high yarn strength. The strength performance of fibers varies depending on the fiber variety. The strength and elongation of fibers of the same variety are also different. Taking polyester as an example, it can be divided into ordinary type and high-strength and low-strength type. When blended with cotton, high-strength and low-strength polyester is selected, the yarn strength is high and the yarn breakage rate is low. However, high-strength drafting polyester-cotton fabrics are not bladder-resistant and are easy to wear.