The key points of quality control of each process in the spinning mill: cleaning and carding

The product quality control of cotton spinning enterprises is a continuous, complex and interrelated textile system project. If you want more scientific management and precise control, you must master the quality control points of each spinning process. 1. The main tasks of cleaning and carding 1. The main tasks of the opening and cleaning process: 　　 (1) The opening is used to compress the cotton bale through the corner nails in each single machine of the opening and cleaning combined machine, and the tearing and striking action of the beater. The bulk fiber is loosened into small cotton bundles, which creates conditions for impurity removal and mixing, and minimizes impurity fragmentation and fiber damage during the opening process.　　(2) Removal of impurities When opening, 50%-60% of impurities in raw cotton are removed, especially large impurities such as cottonseed, seed cotton, sterile seeds, sandy soil, etc.; chemical fiber mainly removes impurities such as silk and lumps. The process of removing impurities should reduce the falling of spinnable fibers and save cotton.　　(3) Mixing Fully mix various raw materials according to the proportion of cotton. The better the raw cotton (chemical fiber) opens, the more uniform the mixing.　　(4) Uniform rolls Make cotton rolls with a certain weight, a certain length and uniformity for use in the next process. When the blowing-carding unit is used, the output cotton flows to the cotton storage box of each carding machine in the carding process, and finally the feast cotton is fed to the carding machine.　　 2. The main tasks of the carding process: 　　 (1) Carding Under the premise of as little damage to the fibers as possible, the fed cotton layer is carefully and thoroughly carded to separate the bundle fibers into a single fiber state.　　(2) Impurity removal On the basis of sufficient fiber separation, the remaining impurities and defects are thoroughly removed.　　(3) Uniform mixing Make the fiber fully mixed and evenly distributed in the single fiber state.　　(4) Sliver slivers are made into uniform slivers with certain specifications and quality requirements and placed in sliver drums regularly. Blow-carding combined carding machine blowing-carding production flow chart 2. Quality control points of the blowing and carding process 1. Quality control points of the opening and cleaning process: 　　The process principle of the opening and cleaning process: multi-pack grabbing, fine grabbing Cotton, full mixing, gradual opening, early falling and less broken, proper carding, less damage to the fiber (1) The cotton grab machine should 'grab more bales and grab less frequently' as much as possible to achieve fine cotton grabbing.　　(2) The raw materials should be evenly mixed. The more uniform the mixing, the more conducive to solving the problem of color difference and color shift, improving the uniformity of the yarn evenness and reducing the coefficient of variation of single yarn breaking strength.　　(3) The clear pattern is arranged according to the arranging chart. The high bag is cut with high caulking, and the low bag is fluffy and flat to ensure uniform cotton mixing, prevent color difference, and strengthen the inspection table to pick out the mess. (4) Improve the operating efficiency of each single machine. It is advisable for the cotton grabber to drop below 1.5mm each time. Maintaining the continuous and stable supply and production of each single machine and the cotton conveying pipeline is effective in reducing the unevenness of the lap weight and reducing the comb. Prerequisite guarantee for cotton sliver weight unevenness.　　 (5) Hanging flowers and clogging of the dust rods are not allowed under the dust rods of each stand-alone thug, and the people who block the vehicles should check and clean them regularly.　　(6) After the raw materials are opened and struck by each stand-alone machine, the short lint and neps will continue to increase, so it is necessary to reduce the growth rate of the short lint and neps by optimizing the beater speed and the adjustment of the gap.　　(7) Minimize excessive turns as much as possible for the pipes conveying the cotton flow, keep it unobstructed, and reduce the turnover friction of the raw materials in the pipes. 2. Key points for quality control of carding process: 　　 Carding process mastering process principle: card clothing is sharp and undamaged, ensuring four fronts and one alignment, ensuring reasonable needle load and carding degree, strengthening transfer, improving carding quality, and reducing carding Linter rate.　　 (1) Equipment safety and personal safety, prevent foreign objects such as cleaning tools from entering and damaging key equipment such as card clothing; the parts that are not allowed to be operated by the car should be repeatedly emphasized and checked by employees.　　(2) It is not allowed for the cotton net cleaner and the suction points of the noil to block the flowers, otherwise it will increase the elimination of neps and impurities.　　(3) Hanging flowers in the triangle area of u200bu200bthe cylinder and doffer will cause cloud spots and disordered fiber clusters on the edge of the cotton net, and increase the thick knots and neps in the subsequent process.　　(4) The micro-voltage value of the detection points on both sides of the cotton roller must be the same, and it needs to be supervised and repaired and electrician corrected regularly, otherwise the weight of the sliver spun out of the leveling failure will fluctuate greatly and there will be many unqualified slivers.　　(5) The transmission part of the auto-leveling should be kept clean and sensitive. If the chain is stretched and the teeth are sprung, contact for maintenance and repair; if the cotton roller is entangled with flowers, the operator should check and remove it at any time.　　(6) The gauge of the carding process must be accurate and meet the process requirements. Otherwise, the combing quality requirements cannot be met, and the damage to the subsequent process and product quality is great.　　(7) Card clothing such as cylinders, flats, licker rollers, doffers and other card clothings of carding machines should be replaced in time or processed by grinding needles in accordance with the service cycle and the quality index level of card sliver. This is also the basis for ensuring stable quality and good combing quality.　　(8) Carry out the car and maintenance work strictly according to the cycle to keep the equipment in good operation.　　Clearing and carding are the key processes of opening and carding in spinning mills. Doing a good job of opening and carding of raw materials is very important to improve the quality of the yarn, reduce the neps of the finished yarn, and reduce the yarn defects. Only when you are familiar with and master the quality control points of each process, and manage and control each process according to scientific maintenance methods, can you lay a good foundation for the quality control of each process. Key words of the article: 　Spinning mill clear carded cotton