Cotton thread

Key points of production of low cotton rotor spun yarn with weak twist

Production process problems and control

The difference of CVB between pipes

There is a great difference in CVB between the weakly twisted bobbins in rotor spinning. The main influencing factors are rotor negative pressure and rotor running state. In rotor spinning, the combined coiling of fibers has certain influence on the inter spindle evenness. In the process of merging, whether the fibers are evenly and closely arranged depends on whether the movement of the rotor condensation tank is smooth and whether the rotor speed is stable. In the actual production, a large number of impurities are embedded in the coagulation tank. If they are not removed in time, the strip will deteriorate rapidly, resulting in a large number of regular or irregular rough sections and details. Strengthening the cleaning of the rotor coagulation tank has obvious effect on controlling the difference between ingots.

The difference of Twist Unevenness

There is a big difference of twist in rotor spinning. The main reason is that in spinning low twist rotor yarn, false twist and true twist are less than that of normal rotor yarn. The degree of uniformity of twist distribution in the same yarn section is related to the twist size. At the same time, due to the difference of rotor state, the twist difference is large. The main preventive measures are to strengthen the maintenance, to ensure the consistency of the rotor twisting transmission mechanism state, to ensure that the tension of the transmission belt is too large to grasp, and to ensure that the twisting effect is stable.

Control measures of 17 cm mechanical wave of weak twist yarn

The mechanical wave of 17 cm in weak twist yarn is a common problem in production, which is mainly caused by impurities accumulated in the rotor condensation tank. Specifically, the increase of the coarse pitch is more, and the wavelength of the curve is generally about 17 cm according to the rotor diameter of 54 mm. The preventive measures are to increase the cleaning degree of the rotor, shorten the cleaning cycle, increase the negative pressure properly to enhance the ability of dust removal and impurity removal, and reduce the accumulation of impurities in the rotor condensation tank.

Control negative pressure of rotor to reduce sudden yarn defects

When spinning rotor spun yarn with weak twist, it is easy to produce sudden coarse section, which is mainly caused by low negative pressure and poor discharge of impurities. In the production process of rotor spinning weak twist yarn, the small twist impurities are not easy to wrap in the yarn strip, and the impurities with insufficient negative pressure agglomerate in the rotor groove, resulting in the obvious increase of coarse and fine impurities. The preventive measures are to ensure the smooth ventilation of the process, to stabilize the rotor negative pressure, and to reduce the occurrence of sudden yarn defects.

epilogue

In order to make rotor spun yarn with low matching cotton, the process of opening, carding and drafting should be reasonably arranged according to the characteristics of low-grade cotton and cotton with more lint and high impurity content. The key technological parameters such as rotor diameter, speed, twist coefficient and anti twist disc should be optimized according to the spinning characteristics of weak twist yarn, and measures should be taken to reduce the difference of the evenness and twist between tubes and eliminate the mechanical wave In this way, the rotor spinning yarn with weak twist can be spun smoothly, the quality requirements can be met, and better economic benefits can be obtained.