Classic yarn making principle
Spinning is a science that studies the processing of textile staple fibers into classic yarns. Classic yarns are generally made from a number of short fibers of varying lengths by twisting, as well as by a long continuous Twisted together. In the spinning process, the first need to remove the defect, that is, the initial processing of raw materials, also known as the preparation of spinning raw materials. Different types of raw materials, different types and properties of impurities, processing methods and in the arts are also different. The initial processing methods of raw materials are mainly physical methods (such as ginning), chemical methods (such as hemp degumming, silk refining) and physical and chemical combination of methods (such as wool washing and defrosting).
Will be chaotic, horizontal and closely linked to the fiber processing into a vertical order, but also has a certain requirements of the smooth and classic yarn, the need to block the fiber into a single fiber state, the lifting of fiber raw materials exist in the horizontal link, to establish a solid first-tail convergence Vertical contact. The former is called fiber release, the latter is called a collection of fibers. The release of the fiber is the complete release of the fiber and the fiber between the horizontal contact. But must be as much as possible to reduce fiber damage. The set of fibers is to re-establish the permissive longitudinal contact of the released fibers, which is continuous and should cause the fiber distribution within the assembly to be uniform and at the same time to have a certain linear density and strength. Fiber aggregates, but also need to add a certain twist. The collection process is not completed once, to be combed, draft and twist and many other processing to be completed.
Crack is a large piece of fiber tearing into small pieces, small fiber bundles. Broadly speaking, hemp degumming is also a kind of open. With the opening action, the contact force between the fibers and the impurities is weakened, so that the impurities are removed, and the fibers are mixed. Opening and removal of impurities is not a complete completion, but after tearing, combat and the role of the rational allocation of such a gradual realization.
Carding effect is a large number of carding machine combing the needle on the fiber small pieces, small beam further release into a single state, thus further improving the fiber release. The horizontal contact between the fibers after the carding is basically lifted, and the impurity removal and blending are more sufficient. But there are a lot of fiber was curved. And there are hooks, each fiber is still a certain horizontal link between.
The combing function of the combing machine is a more detailed combing of the ends of the fibers by the combs, respectively. Comber processing can eliminate a certain length of the following short fibers and small defects, to promote the fiber more parallel, straight. Chemical fiber because of its length neat, less impurities, straight parallel state is good, generally not through the combing machine processing.
The card after the sliver pumping thin drawing, and gradually reach the scheduled thickness, this process is called draft. Laying the foundation for the firm establishment of a regular coherence relationship between the fibers. However, the draft will bring the yarn short pieces of uneven, therefore, need to configure a reasonable drafting device and process parameters.
The twist is to twist the strip about its own axis so that the fibers parallel to the axial direction of the strip are spirally shaped to produce radial pressure to fix the longitudinal connection between the fibers.
The semi-finished or finished product is wound in a certain form for the storage, transportation and processing of the next process, which is said to be wound. The winding process should be carried out continuously without affecting the yield and quality of the product. Efforts should be made to achieve continuous production between processes and to minimize the quality problems caused by the winding process. In short, the spinning process generally includes the preparation of raw materials, opening, combing, impurity mixing, drawing, drawing, mixing, twisting and winding and so on, some of the role is repeated after repeated to achieve.