The impact of ginning production on nep content
The production process of traditional ginning finishing is basically the same regardless of the differences in impurities, moisture regain, color and fineness of the lint. The lint goes through the initial treatment of a brad cylinder, a sawtooth cylinder or a set of brad and sawtooth hybrid cylinders. Finished, and then cleaned with finer sawtooth wood. This traditional ginning production has neither accurate and rapid detection technology nor automatic quality monitoring system. Therefore, the quality indicators of the finished raw cotton are not ideal. 1. Overseas, large-capacity raw cotton quality detectors (HV1) and Afis detectors were used to test the quality of raw cotton before and after ginning. It was found that the quality of lint cotton with different moisture regains and impurities after ginning was very different. If the lint moisture regain is 4.1%, 5.5%, and 2.4% respectively, conduct a group ginning finishing test and find that in addition to the increase in short lint, the neps content changes greatly. When using two cleaning machines to clean lint, the lint moisture regain dropped from 8.4% to 4.1%, and the neps were reduced by 38%. 2. Different lint rolling methods produce different neps. Afis-N rapid nep content tester is used abroad to sort the same lint on roller cotton and sawtooth cotton. The neps produced are very different. Cotton contains 200-250 neps, 450 neps high, while roller cotton only has 150 neps/g. Due to the different neps content, the neps content of the semi-finished products in the downstream process is obviously affected. As shown in Table 3:
Table 3: Comparison of raw cotton produced by different ginning methods and the nep content of each process. 3. Many ginning equipment in the United States are controlled by electronic computers to monitor the quality. After the lint with different moisture regains and impurities is detected by sensors, the electronic computer controls the ginning process and applies Zeilweiger’s intelligent monitoring system to realize ginning production. online monitoring. The optimization process of raw cotton with different moisture regains and impurities is carried out in a targeted ginning process. After ginning, the neps content of raw cotton is reduced. A set of intelligent ginning monitoring technology. Sensors are set up in three air transport channels to automatically monitor lint finishing. It can realize human-machine dialogue, online adjustment, feeding and ginning speed, and is equipped with appropriate units to optimize ginning production to adapt to Lint finishing under different conditions such as moisture resurgence and impurity content. The online monitoring technology of foreign ginning production mainly controls the indicators such as fiber neps, seed shell neps, impurities and short lint, which is a major progress in ginning production. 4. The management of raw cotton quality in developed countries has entered the stage of package-by-package inspection, and the large-capacity cotton quality inspection instrument (HV1) is used. Regarding the differences in nep content due to different seasons, maturity, origin, picking and ginning methods, through package-by-package inspection, we can find out the quality of raw cotton and the difference in nep content, so that the quality of raw cotton in the entire country or region is completely under control. , to ensure the product quality of spinning and weaving. For example, a fabric factory in the United States inspected the cotton bales entering the factory one by one and found that there were significant differences in the neps content between the bales. See Table 4
In Table 4, the nep content in groups 3 and 7 was very high. Then it will be eliminated and used, so that the neps content of the raw cotton will be stabilized at the level of 210, ensuring the spinning quality. Spinning production can also optimize the blowing and carding process based on the package-by-package inspection results, take corresponding technological measures to reduce neps, and use correct cotton blending methods to stabilize the quality of raw cotton entering the workshop during production.
AAAKY, 7II56U65
Extendedreading:https://www.alltextile.cn/product/product-69-541.html
Extendedreading:
Extendedreading:
Extendedreading:
Extendedreading:
Extendedreading:
Extendedreading:
Extendedreading:
Extendedreading:
Extendedread
