Relationship Between The Tooth Shape Of Cylinder Gear And The Removal Of Defects And Harmful Fibers In Comber

Combing machine to remove carding defects and harmful fibers is not only completed by a comber combing equipment. It is a combination of the nipper opening, comb density, cylinder gear density and spinning process configuration of comber. The change of combing machine's spinning equipment and the change of spinning process to achieve the removal of defects and harmful fibers in carding strip is the key to ensure the quality of combed and combed cotton yarn in subsequent processes.

The problem often occurs in actual production is that it is not clear which dangerous defects, harmful fibers and their quantity in the carding strip, so it is not possible to find out the range of harmful and harmful fibers in the combing strip.

A part of hazardous defects (NEPs, fibers, seeds, impurities, dust), hazardous fibers (short fiber percentage and immature fiber) can be detected by spinning test apparatus, while another part of the harmful defects (dead cotton, white star, rigid spot, soft seed epidermis, silk) and harmful fibers (varying degrees of immature fiber) need to be distinguished by naked eye sensitivity. Only after the comprehensive analysis of the defects of the spinning test apparatus and the naked eye can the comb and Xilin models of the comber be decided.

According to the quantitative change of combed sliver and cotton roll and the number of combed cotton yarns, changing the top comb, cylinder gear density and tooth shape of comber, and the change of density in cylinder area of comber are the key to reduce the number of combed cotton yarn defects and harmful fibers.

Spinning practice shows that in many cases increasing the angle of the cylinder of the comber is far from increasing the cylinder density of the comber and reducing the harmful defects and the effect of the fibers. Therefore, it is worth considering how to change the combing machine's cylinder angle, improve the combing carding quality and carding effect. In many cases, it is found that the 130 degree combing cylinder combing strip quality is worse than that of the 90 degree or 110 degree comber cylinder. No matter whether it is high speed or low speed, large or small feed volume is the same, the change of the cylinder's gear density is very obvious for improving the carding quality and carding efficiency.

The relationship between cylinder gear density and comber defect control is shown in Table 1.

Table 1 test data show that with the increase of cylinder gear density in combing machine, the defects and visual defects of comber slivers are decreasing. Especially when the total number of teeth in the comber is close to or above 40000 teeth, some of the main harmful defects of comber strip are reduced or zero, and the number of dust particles decreases greatly. Especially for the production of extra low count cotton yarn, it is beneficial to reduce fine yarn defects. At the same time, when the total number of teeth of the combing machine is over 39000 teeth, it is very beneficial to remove the small and difficult yarn defects from raw materials, such as dead cotton, white star, stiff spot, soft seed epidermis and wire.

The control relationship between the cylinder gear density of comber and combed strip hazardous fiber is shown in Table 2.

Table 2 test data show that increasing the cylinder linen density of comber will greatly reduce the content of harmful fiber short fiber, immature fiber and heterosexual fiber in combing strip, which is conducive to increasing the fiber elongation ratio during the carding process and increasing the effective fiber utilization rate, blocking some foreign fibers and excluding them into combed noil. When the total number of groin in the combing machine increases from 26000 to 46000 teeth, the short staple rate, immature fiber content and foreign fiber decrease greatly, to a certain extent, it is superior to the cleaning effect of the foreign fiber cleaning machine in the cleaning process, and the cleaning effect is better for single foreign fibers.

The relationship between the cylinder liner density of carding machine and the main harmful defects and harmful fiber removal effect of carding strip is shown in Table 3.

Table 3 test data show that with the increase of cylinder density of comber, all kinds of defects and harmful fibers in combing strip will be reduced no matter the quality of mixed cotton.

The production practice has proved that the lower the quality grade of the blended cotton, the larger the cylinder density of the comber, the higher the removal efficiency of the defect and harmful fibers. However, the quality control index of the combed strip will not always be good. Therefore, controlling the quality of the blended cotton and the sliver is the key to control the comber defects and harmful fibers in the combing process.