In spinning process, how to eliminate the phenomenon of loose yarn?

The strength of single yarn is often not enough to meet the weaving requirements. It needs to be made into strands with strong strength, good elasticity, uniform thickness, smooth surface and beautiful wear-resisting through the process of doubling and twisting to meet the requirements of the later process.There is a common yarn flaw in the double twist process called "small plait yarn" and some called "small ear yarn", which troubles the majority of textile enterprises.Its appearance is related to many factors such as single yarn quality, parallel yarn, difference of double twist tension, and operation standard of blocking car, etc., which are analyzed in detail in the following aspects.

I. Factors of single yarn

(1) Single yarns are strongly twisted, or relatively so;

(2) Unevenness of single yarn, especially easy to produce small pigtail yarn;

Solving the single yarn problem is the root cause, if the single yarn problem, no matter how well done in the back.But this is often a place that the yarn factories do not pay attention to, or they can not control.

Second, the causes of the yarn process

The tension of the two yarns in the process of drawing together is loosened and tightened. In the process of drawing together, observed by flash speedometer, there are obvious yarn splitting in the process of forming a tube. The loose yarn kinks when retracting, which is commonly referred to as pigtail yarn, and it is also a particularly important factor for forming pigtails.

Avoid means

(1) In the process of doubling yarn, it must be carefully checked according to the technical regulations, and used in the yarn tension detector when necessary;

(2) Check if there is any loss of tension sheets in the yarn doubling process;

(3) Check whether the tension device is not flexible in rotation;Whether there is flywool cotton plug each component;

(4) Whether each single line or strand is traveling on the correct yarn path;

(5) Whether there are burrs on the tank cylinder;

(6) Whether the unwound tension fluctuates too much depends on the installation of the original yarn, which can also be detected by online yarn tension detector.

Third, the reason of double twist process

(1) Whether the tension pieces of the double twisting machine are in normal condition;

(2) Whether the unwinding is normal.

Iv. Causes of winding process

(1) The pigtail yarn was not cut off when the winding was electrically cleared;

(2) Whether the current cleaning condition is normal;

(3) The inspection worker did not check the quality of the pigtail yarn.

There are many reasons to produce pigtail yarn, but the main reasons are the tension of the original yarn, the yarn drawing process and the electric cleaning.In order to solve it thoroughly, to evaluate the above links, fine management is the most important.