The Manufacturing Principle Of Yarn

The manufacturing principle of yarn

1. Impurity removal

Yarn is generally formed by twisting many short fibers of different lengths, and also by twisting long continuous monofilaments. In the spinning process, the first thing to do is to remove miscellaneous defects, that is, the initial processing of the raw material. The types of raw materials are different. The primary processing methods of raw materials mainly include physical method, chemical method and combination of physical and chemical methods.

2. Post

To process disordered and tightly connected fibers into smooth yarns with certain requirements, it is necessary to change the bulk fibers into a single fiber state, remove the lateral connections of the fiber raw materials, and establish a strong longitudinal connection between the head and the tail. The loosening of fibers is to completely eliminate the lateral connection between fibers, but the damage of fibers must be minimized.

3. Opening

Loosening is the tearing of a large piece of fiber into small pieces and small bundles of fibers. In a broad sense, degumming of hemp is also a kind of loosening. 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.

4. Comb

The carding function is that a large number of dense carding needles on the carding machine further loosen the small pieces and bundles of fibers into a single state, thereby further improving the looseness of the fibers. After carding, the lateral connection between fibers is basically relieved, and the functions of impurity removal and mixing are more sufficient. But a lot of fibers are curved, hooked, and there is still a certain level of connection between each fiber.

5. Grooming

The combing function of the comber is to use a comb to comb more carefully while holding both ends of the fiber respectively. Combing machine processing can eliminate short fibers and small miscellaneous defects below a certain length, and promote more parallel and straighter fibers. Chemical fibers are generally not processed by combing machines due to their neat length, less impurities, and good straightness and parallelism.

6. Draft

The carding strip is elongated and thinned, gradually reaching a predetermined thickness. This process is called drafting. It lays the foundation for the firm establishment of regular head-to-tail connections between fibers.

7. Twist

Twisting is to twist the whisker around its own axis, so that the fiber is parallel to the axial direction of the whisker helix, thereby generating radial pressure and fixing the longitudinal connection between the fibers.

8. Winding

The semi-finished product or finished product is rolled into a certain form to facilitate the storage, transportation and processing of the next process.