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How to form and add cotton sewing thread?
- Apr 17, 2018 -

The first is to accumulate fibers into a massive aggregate, which is then processed into cotton wadding and cotton nets. The laps and webs are then bundled into strips. Finally, the strips of cotton fibers are gradually drawn. Bunches of rovings and spun yarns are drawn. Among them, two important steps in the entire process from laps and cotton webs to yarns, and how to make cotton fiber bundles become pure cotton yarns with a certain linear density and strong elongation are the entire yarns The key to the process. In the traditional spinning method, the solution to this problem is to add twists.

The twisting is to make the two sections of the cotton line rotate correspondingly. At this time, the fibers in the line which are originally parallel to the yarn axis are tilted into a spiral line. When the cotton line is subjected to tensile external force, the inclined fiber generates an inner circle on the yarn axis. Pressure, so that there is a certain degree of friction between fibers and not easy to fall, pure cotton lines have a certain strength. For pure cotton, twisting is a necessary tool for yarn formation. The amount of twisting and the combination of heading and twist in yarns and fabrics are closely related to the appearance and many physical properties of the finished product.

The arrangement of the individual yarns in the different joints. When the number of twisted single yarns is 5 or less, the single yarns in the twisting process are evenly distributed to form a hollow structure, the structure of the sewing thread strands is stable and uniform, and the strength of the sewing thread strands is high. When more than 6 single yarns are combined together, one or more single yarns will be in the middle position. During the twisting process, the individual yarns are not evenly loaded, and the tension of the single yarn is greater than that of the single yarns. The tension of the middle single yarn, the position of the inner and outer single yarns will shift due to different tensions, the structure of the strands will be unstable, and as a result, the sewing thread strands will form a non-uniform solid structure and affect the strength of the strands. When the twist is high, due to the inhomogeneity of the force of the single yarn, the spiral structure of the sewing thread may occur and the quality of the strand may be reduced. Therefore, in actual production, the number of single yarns that are combined together should not exceed five. If you need more than one number of mergers, you must use two or more mergers.