Causes and control measures of small bamboo joint defects in yarn formation process

Small slub defects are common in the production process. To eliminate small slub defects, supervision must be started from the previous process of the fabric. Such defects are all small slubs when viewed from the cloth surface. According to the test data analysis of the evenness tester and the cloth removal According to the observation and comparison of physical quality, it is determined as cotton ball defective cloth. Once such defective cloth appears, it is a large quantity of yarn defects, which will cause serious losses to the enterprise. They are generally distributed in the carding process and the spinning process. Now the small slub The defect generation process and control measures are analyzed as follows.

Pre-spinning carding process

1.Causes and control measures of small slub defects

The characteristics of the cotton ball defect cloth in the carding process on the cloth surface are that the bamboo joints are very small, and the cloth surface is distributed as long pieces of "gypsophila". After disassembly analysis, the fibers at the bamboo joints are twisted into cotton balls attached to the yarn. The surface of the strip is easy to remove. The main reasons for the small slub defects are: the cotton lap in the carding process is fed with wet flowers, the fed tow fiber, the grease is easy to stick to the card clothing, the distance between the cylinder and the doffer is not correct or Too small, the surface of the card clothing is uneven and the card clothing is declining. Sometimes the oil content of the polyester fiber is too low or the relative humidity in the production workshop is too high, which will also cause the card to go around the cylinder, resulting in poor fiber transfer and small slub defects.

Control measures: Strictly control the quality of raw materials, first use first, wet bales are not allowed on the machine; roving ends are treated and then mixed with raw cotton; the relative humidity cannot be greater than 60%.

2.Causes and control measures of large cotton spherical slub defects

The cotton ball defect fabric in the carding process has a large cotton ball on the cloth surface, and the slub defects are larger and scattered in a wide range of the cloth surface. Most of the slub fibers are kinked, and these problems are mainly caused In the front part of the carding process, it is caused by operational factors; there is also a part of the bamboo joints when the fabric is dismantled and analyzed, the fibers are short and no kinks, mainly generated in the large leak bottom part, caused by the leak bottom blockage and hanging flowers.

Control measures: regular scrubbing of cotton stripped aprons to eliminate hanging flowers on the aprons; regular cleaning and polishing of the front upper, front lower iron plate, rear upper and rear lower iron plate of the carding machine; all passages and doffer housings are found to have grease ､It is not smooth and clean, it should be cleaned regularly; the wall panels should be cleaned up, and if the cotton web is found to have broken edges, it should be treated in time. The cotton ball defect of the carding process "stars" or "neps" small slub defects on the cloth surface Analyzed by the method of dismantling the cloth and picking yarn, the "cotton ball" small slub defects are easy to strip, but they cannot be moved.

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