How can we make the spinning drafting process smoother and reduce thick spots?

You can start from these two directions:

1. Improve carding effect, strengthen single fiberization and reduce short lint.

Whether the fiber is sufficiently single fiberized will greatly affect the thick place index of the spun yarn. It is easy to understand that if the single fiberization is done well, the drafting process of the spun yarn will naturally be smoother.

The same goes for short staple. The reason why the slub of combed yarn in the same spinning mill is so much lower than that of carded yarn is that when the short staple content is low, the drafting process of the spun yarn is smoother.

2. Keep the spinning drafting mechanism in working condition. The front and middle gears of fine yarn have a great influence on thick places.

The working status of the front rubber roller, front roller, middle roller, upper pin, lower pin, upper and lower apron, including the weighting arm, accounts for more than half of the problem of thick spots in spun yarn.Reasonable replacement and maintenance of the spun yarn drafting components can very effectively reduce the thickness of the spun yarn. This situation is also very suitable for reducing the details, and the effect is more obvious.

The slub of spun yarn should be a problem of how to arrange and draft the fibers, while the nep problem is a problem of how to remove the lumped fibers.

▎Causes of neps formation and measures to reduce neps

In the spinning process, the reasons for the formation of neps are divided into two aspects. One is inherent in cotton, and the other is generated during the spinning process.

The neps that come with cotton are easy to understand. The arrangement of natural cotton fibers must not meet the requirements for the orderly parallel arrangement of yarn.

At the same time, there are many naturally formed substances between cotton fibers when organisms grow. These things are It's the neps that come with cotton.

Our spinning process, except for winding, all revolves around carding and drafting. Its purpose at the fiber level is to process cotton fibers into orderly parallel and single fibers, which can eliminate cotton's own neps.

The carding process is called the heart of spinning.

It is also for this reason that carding takes on a large part of the debris removal task, directly eliminating debris and certain fibers that are not suitable for yarn spinning, and at the same time completely responsible for single fiber processing.

transformation tasks. Therefore, the improvement of the carding process will have a great effect on improving yarn quality.

Of course, it will also have a significant effect on reducing neps. The neps produced in the spinning process are generally caused by insufficient smoothness of the channel and insufficient cleaning work.

Due to friction, entanglement and attachment of flying particles, they become entangled with the yarn and form small groups, becoming neps. These are the causes of neps in the spinning process.

Therefore, in order to reduce neps, it is necessary to improve the status of the equipment and ensure that the process is ready for production,such as new card clothing. The application of new technologies and new processes will greatly improve product quality.

However, the same equipment and the same process will not be used by each factory. The quality of the resulting products varies greatly.

The question is whether the equipment is in normal condition, whether it can meet the process requirements, and whether the set process can be put into production.

The carding process is not only controlled at all levels in the card clothing management, but also the "four fast and one accurate" on the equipment are responsible for the "four fast and one accurate" every day,

and strict inspections are carried out.Taiwan will never release it.

At the same time, it has carefully studied and discussed the supporting issues of steel rings and travelers for spun yarns,

and formulated a reasonable traveler replacement cycle and steel ring regrinding cycle to prevent the occurrence of sudden yarn defects.

Secondly, controlling the temperature in the workshop can also significantly reduce the generation of neps. Practice has proven that the moisture regain of raw cotton is greater than 10%, and the moisture regain of cotton laps is greater than 9.0%,

which is not conducive to the opening, carding and impurity removal of raw cotton, making the card sliver cotton The impurities in the knots increase sharply,

which is more obvious when the maturity of the raw cotton is low and the impurities are short and lint. This causes the short lint in the neps of the card sliver to increase and the neps and impurities increase.

Therefore, the temperature and humidity of the workshop should be controlled well to maintain a suitable and stable temperature and humidity in the workshop, which is beneficial to reducing neps and impurities in the sliver.

The relative humidity of cleaning cotton is controlled at about 62%, the relative humidity of carding is controlled at 56% to 59%, and the moisture regain of card sliver is 6.3%,

which is very important to reduce the number of neps and impurities in card sliver.