What is hairless?

Hairiness is an important quality index that affects the appearance and style of yarn. Yarn hairiness directly affects weaving efficiency, fabric style and dyeing effect. In recent years, with the rapid change of knitted products and people's colorful consumption demand, the hairiness problem of knitted yarns has also put forward corresponding updating requirements. Because the hairiness state of ring-spun yarn has a direct influence on the spinning process parameters such as yarn number, yarn twist, spinning speed and winding size, and because the hairiness shape of ring-spun yarn is irregular and its distribution on the yarn surface is random, even if the hairiness value reflected by the length of each yarn with the same yarn number is average, the hairiness values of various lengths often vary greatly. Therefore, how to analyze and evaluate the ring yarn hairiness in our factory, establish and strengthen the quality control and management of knitting yarn hairiness must proceed from the reality of the enterprise, make full use of the detection means of yarn hairiness tester, and formulate the quality standards related to hairiness to prevent the occurrence of hairiness and meet the requirements of users.

(1) Several phenomena of poor hairiness;

From the test analysis and customer feedback, the so-called yarn hairiness problem has the following phenomena.

The overall value of 1. hairiness is high, which leads to the unclear surface of knitted fabric and seriously affects the dyeing effect.

2. Hairiness CV value is high, and customers report that the fabric surface is uneven, which affects the dyeing difference.

3. A few yarns have dense hairiness, which leads to the formation of cotton balls in the knitting channel, and neps affect the broken ends and fabric quality.

(2) Cause analysis and countermeasures:

1. Hairiness has high overall value.

Reason:

(1) The matching use of steel collar and traveler is unreasonable.

Countermeasures:

A) The hairiness can be effectively reduced by adopting new steel collars and traveler, such as self-lubricating steel collars and fluorine-plated traveler.

B) According to the requirements of different numbers, make the use and replacement cycle of steel rings and traveler.

C) Self-lubricating alloy steel collar can be used for machines that often undergo variety transformation, which is beneficial to eliminate the influence of steel guide rail on traveler during variety transformation and overcome excessive hairiness that often occurs during variety transformation.

(2) The twist coefficient of spun yarn is low.

Countermeasures: appropriately increase the twist coefficient of spun yarn. For some knitted yarns that require smooth fabrics, it is an effective method to appropriately increase the twist coefficient.

(3) The short fiber content of roving is high.

Countermeasures: appropriately increase the noil rate, increase the short fiber content of fine noil and reduce the noil difference of comber.

(4) The relative humidity is too low in the spinning process, and the yarn is hairy.

Countermeasures: strictly control the temperature and humidity in the workshop and strengthen the patrol adjustment of air conditioning regulators.

2. Hairiness has a high CV value.

In a good mechanical state, the hairiness CV value of ring yarn can be kept at a certain value relative to different counts, and its CV value level is positively correlated with the count of ring yarn, that is, the yarn is fine and the CV value is high; The yarn is thick and the CV value is low. In addition, when long-staple cotton and fine-staple cotton are blended in a certain proportion, their hairiness CV value will be higher than that of single long-staple cotton or fine-staple cotton with the same count. Analysis of the hairiness problem that affects the quality of users is often related to the poor mechanical conditions of individual machines or numbered spindles. From the daily inspection and tracking analysis, the reasons for the high CV value of hairiness between batches or machines are as follows:

(1) Spinning spindle is skewed, resulting in balloon bending. In this case, the hairiness index will be 2-3 times or more higher than normal.

(2) The positioning of the collar plate is loose, and there are crooked balloons, which occasionally appear in our factory. This phenomenon is the most serious. The hairiness of the bobbin yarn is long and dense, which is very obvious to the naked eye, and the detection data is 3-5 times higher.

(3) The yarn separating plate is loose and skewed, and the yarn guide hook is loose, resulting in the balloon being skewed.

(4) The traveler is burned and worn, and the collar seat floats.

(5) The spinning tube is deformed and the tube cavity is worn, resulting in a "shaking head" tube.

In a word, it is mainly caused by the bad state of the winding part of the spinning frame.

Countermeasures:

(1) Strengthen equipment maintenance, strictly implement the system of person in charge of machine maintenance, ensure the flat collar plate, ensure the accurate position of yarn distributor, cleaner and yarn guide hook, control the shape of Suu balloon, and correct the phenomenon of balloon deviation in operation.

(2) Strengthen the maintenance of special parts (spindles).

(3) Strengthen the use and management of spinning packages to ensure package quality.

(4) LanCheGong should be combined with tour operation, strengthen the mechanical control.