The main measures to save cotton in the process of opening and cleaning are as follows:
(1) Fully open: Only when it is fully opened, it is possible to fully expose the impurities to achieve the separation of the fibers, and it is also possible to exclude impurities and retain the fibers. Otherwise, the fibers are contained and adhered to each other, and impurities are removed to increase the loss of the spinnable fibers.
(2) According to the quantity of raw cotton and the content of impurities, reasonably distribute the rate of cotton removal in the carding process: if the raw cotton has a high impurity content and contains a large amount of impurities suitable for the removal of the cleaning process, the opening should be appropriately increased. The rate of cotton removal in the cotton process, otherwise, the cotton removal rate of the open cotton should be reduced, and the cotton removal rate of the carding process should be appropriately increased. Because, if it is necessary to forcibly remove fine impurities that are not suitable for its removal during the cleaning process, it will be at the expense of eliminating a large amount of cotton, and it is not necessarily able to achieve good impurities.
(3) Give full play to the functions of each stand-alone machine: the single-machine is different, and its opening and removing performance is different. For example, the six-roller opener has a relatively simple opening effect and good performance, and the effectiveness of eliminating large impurities such as cottonseed, seed cotton, and large infertile seeds is better. When the raw cotton contains more than such impurities, the process parameters of the machine should be adjusted, and the cotton should be appropriately increased to eliminate impurities. If there are many small hard impurities such as seed chips, leaf chips and branches, the process parameters of the cotton cleaning machine should be adjusted reasonably so as to eliminate impurities in the comprehensive beater.
(4) Different raw materials, different treatments: For the raw cotton containing high impurities or the general tight cotton, it can be treated by two porcupine-type openers in the process of opening the cotton. Otherwise, one can be skipped. Miscellaneous low-grade cotton or high-water raw cotton should be properly pretreated.