Briefly describe the types and structural characteristics of structural yarns.

Briefly describe the types, structures and characteristics of structural yarns as follows:

1, ring spun yarn: the basic structural feature is tight inside and loose outside; Half of the fibers are conical spirals; A few fibers do not transfer inside and outside, showing a cylindrical spiral; A small number of fibers are hook-shaped, ring-shaped and folded in half; Most of the fiber ends are exposed to form hairiness, and a few are bent, contracted or entangled with other fibers.

2. Free end yarn: the internal and external transfer of fibers is not significant, and most fibers are cylindrical spirals. The straightness of fibers in yarn strips is low, and the number of fibers that are hooked, looped and folded in half is large; Rotor spinning is loose inside and tight outside, with multiple fibers wrapped in the outer layer and high orientation in the inner layer; The free-end yarn has rough surface, poor smoothness and hard handle, but good evenness.

3. Laminated yarn: The structural characteristics of laminated yarn are determined by its length/short, short/short, long/long mixture ratio and tension. This structure can effectively improve the yarn strength and increase the continuity and stability of the yarn.

Introduction of ring spun yarn;

Ring spinning is a traditional spinning method with mature technology, and it is the largest and most important spinning method in spinning production. Although the new spinning technology has high production efficiency, short process flow and good variety adaptability, the yarn structure and performance are not as good as ring spinning, and it is impossible to completely replace ring spinning for a long time.

Therefore, ring spinning is still the most important spinning method in modern spinning production. The contemporary ring spinning frame has made great progress in drafting pressure form, winding and twisting technology, transmission mode, long to fine winding and compact spinning technology, and formed a high-tech ring spinning frame.

Product development:

In order to improve the deformation of knitted fabrics, people have developed many methods, which can be summarized into three categories: improving yarns (using double yarns, non-traditional yarns and steamed yarns, etc.). ), improve knitting (using machine steering suitable for yarn twist direction, reducing yarn feeding path, improving fabric tightness coefficient, using appropriate yarn feeding tension and pulling tension, etc.). ) and improve the finishing process.

Although these methods can reduce the twist angle, they also have problems such as unsatisfactory fabric performance or high production cost. In order to fundamentally improve the fabric deformation, a new type of low residual torque ring yarn-twisted yarn (patented) was developed by reducing the residual torque of the yarn.

Its principle is to install a specially designed yarn between the front roller and the yarn guide hook to improve the fiber arrangement in the device area and rearrange and optimize the fibers in the yarn, so as to greatly reduce the residual torque in the yarn and correct the twist of the knitted fabric on the premise of ensuring the yarn strength, elongation, uniformity and hairiness.