The so-called semi-worsted yarn is a kind of behavior that takes animal bai or plant fiber and twists it into a continuous and infinitely extending yarn, which is suitable for weaving. The spinning process includes 8 steps of impurity removal, loosening, opening, carding, combing, drafting, twisting and winding. Spinning is a science that studies the processing of textile short fibers into yarns. Yarns are generally made of many short fibers of varying lengths through splicing methods, as well as long continuous monofilament twists. Combined. In the spinning process, it is first necessary to remove imperfections, that is, preliminary processing of raw materials, also known as the preparation of spinning raw materials. The types of raw materials are different, the types and properties of impurities are different, and the processing methods and processes are also different.
The primary processing methods of raw materials mainly include physical methods such as cotton ginning, chemical methods such as degumming of hemp, refining of spun silk, and methods combining physical and chemical methods such as washing and de-grazing of wool. Process the messy, horizontally tightly connected fibers into a longitudinal order, and have a certain requirement of smooth yarn. It is necessary to turn the bulk fiber into a single fiber state, release the horizontal connection of the fiber raw materials, and establish a strong end-to-end connection. Vertical connection. The former is called fiber loosening, and the latter is called fiber assembly.The loosening of fiber is to completely remove the horizontal connection between fiber and fiber.
However, fiber damage must be minimized. The assembly of fibers is to re-establish an ordered longitudinal connection of the loosened fibers. This connection is continuous, and the fiber distribution in the assembly should be uniform, and at the same time have a certain linear density and strength. The fiber assembly needs to be twisted. The assembling process is not completed at one time, it can be completed only after multiple processing such as carding, drafting and twisting. Opening is to tear large pieces of fibers into small pieces and small fiber bundles. Broadly speaking, the degumming of hemp is also a kind of opening. As the opening action progresses, the connection force between the fibers and the impurities is weakened, so that the impurities are removed and the fibers are mixed.
The opening effect and the removal of impurities are not completed at one time, but gradually achieved through the rational configuration of tearing, striking and segmentation. The carding function is to further loosen the small pieces and small bundles of fibers into a single state by a large number of dense needles on the carding machine, thereby further improving the loosening of the fibers. After carding, the transverse connection between the fibers is basically eliminated, and the effect of impurity removal and mixing is more sufficient. However, a large number of fibers are curved. And there are hooks, and there is still a certain horizontal connection between each fiber. The combing function of the combing machine is to use the comb to perform more detailed combing under the state of holding the two ends of the fiber. Combing machine processing can eliminate short fibers and small imperfections below a certain length, and promote the fibers to be more parallel and straight. Chemical fibers are generally not processed by a comber because of their neat length, less impurities, and good straightness and parallelism.