Spinning yarn is prone to color difference, which is one of the quality issues that color spinning companies need to focus on controlling. Therefore, the causes of color difference in each process must be carefully analyzed and corresponding technical measures must be taken to control them.
Cotton blending process
(1) The raw materials are dyed unevenly, the dyeing vats are too different, and there is no pretreatment during mixing, resulting in color difference. Premixing can be used to eliminate or prevent it.
(2) If the color difference between the previous and later batches of dyeing raw materials is large and the color difference occurs, the proportion of the colored part can be readjusted. If it cannot be adjusted, batch processing can be used to prevent and cure it.
(3) Color difference caused by weighing problems can be prevented and controlled by standard operations, careful checking of the “mixing proportion notice and requirements” and repeated measures.
(4) Color difference caused by moisture regain of raw materials. Raw materials with inconsistent moisture regains are not converted according to the public weight. The moisture regain of newly dyed raw materials is usually very high. At this time, they are still weighed according to the actual weight. The actual proportion of the colored components is reduced, and the color of the yarn becomes lighter; the colored raw materials are placed For a longer time, due to the decrease in moisture regain, the actual proportion of colored parts weighed according to the actual weight increases, and the color of the yarn becomes darker. This kind of color difference should be prevented and controlled by converting the standard weight of each ingredient strictly according to the public weight.
(5) Color difference caused by uneven arrangement. When arranging flowers on the plate, if the raw materials of various ingredients are not placed according to symmetry points or specified requirements, it is easy to cause color difference. Prevention and control measures: If there are many raw materials in the cotton blend, two symmetry points should be taken for each raw material when arranging the plate; if there are few raw materials in the cotton blend, three or more symmetry points should be taken for each raw material when arranging the plate. point.
(6) When spinning light-colored yarn, the content of colored raw materials is less. If the colored raw materials are not placed evenly during arranging, color difference problems may easily occur. Prevention and control measures: Fill the colored parts of the raw materials into the slits of other raw materials; or adopt the method of premixing first and then arranging the plates.
(7) If the work such as cutting the caulking, lowering the bag and loosening is not done well after arranging the plate, it is also easy to produce color difference. Measures can be taken to prevent and cure the problem, such as standardizing the layout work, and having the quality supervisor or the shift leader re-inspect the work before starting the vehicle.
(8) The color difference caused by the mixing of foreign fibers can be prevented and controlled by strict and standardized positioning and labeling management of raw materials and semi-finished products.
(9) Improper management of returned flowers can also cause color difference. Management of returned flowers should be strengthened, such as packaging and weighing, marking ingredients and weights, classifying discharge, etc.
Blow cleaning process
(1) Color difference caused by layout errors. For example, when arranging the plate, the entire plate is corrected; or a few packages are corrected. Standardized systems and operations can be adopted to prevent and control this by requiring layout workers to carefully read the signboard, proofread the content of the signboard, and only drive after being inspected by the supervisor or shift monitor.
(2) Failure to stagger the cotton bales at the head and tail of the pan when arranging the pan will also cause color difference. Therefore, the cotton bales at the head and tail of the pan should be staggered when arranging the pan. .
(3) When changing varieties, the cart belly, pipes, and cotton conveying curtains were not cleaned cleanly, and the raw materials of the previous variety were not removed after the cotton rolls were spun. The resulting color difference can be prevented and controlled by disassembling and cleaning the belly of the blower, pipes, cotton conveying curtains, etc. during the machine and then reinstalling them. When starting the machine, remove the raw materials of the previously spun varieties and continue production.
Carding process
(1) Regarding the color difference caused by using the wrong cotton roll for carding, Strict operating methods can be adopted to prevent and control measures such as correcting the pre- and post-process labels, especially when spinning new varieties, and strengthening inspections.
(2) When changing varieties, the belly of the car was not cleaned thoroughly, and the color difference caused by not taking out the slivers of the previous variety after the head was raised. You can clean the belly thoroughly and pinch it. To prevent and control it, remove the strips from the first few meters.
(3) Strict management and standardized operations can be adopted to deal with the color difference caused by not using the color of the barrel ring in accordance with the regulations, causing the bars to flow into the next process and be mixed with other varieties. Strengthen inspection and assessment methods to prevent and control.
Drawing process
(1) The wrong sliver is used, or the process identification is wrong As a result, the wrong sliver is used, and the color difference caused by this process is not monitored and tracked. Strict operation methods can be adopted, proofreading the pre- and post-process marks, and checking whether the color of the barrel ring of each barrel of sliver is consistent. In particular, inspections must be strengthened when spinning new varieties. to prevent and treat.
(2) If the color difference is caused by not clearing the remaining strips when changing varieties, you can adopt the method of formulating rules and regulations (the original remaining strips must be removed before changing varieties and driving) ) and have the shift leader organize an inspection before driving, and only if you pass the test can you drive to prevent and treat it.
(3) Strict management, standardized operations, and strengthening of color differences caused by failure to use barrel ring colors in accordance with regulations, resulting in the sliver flowing into the next process and mixing with other varieties, can be adopted Prevention and control through inspection and assessment.
(4) If the automatic stop fails after the machine is set, the color difference caused by the lack of strips being fed or the thin strips not being jammed, measures can be taken to strengthen equipment maintenance, strengthen patrol inspections, and strictly control the color difference.�Prevent and cure defects by preventing and catching defects.
Roving process
(1) If the wrong sliver is used manually, or the wrong sliver is used due to an error in the process identification, this process Color differences caused by failure to monitor and track can be prevented by adopting strict operating methods, correcting the pre- and post-process markings, and checking whether the color of each barrel of sliver is consistent. In particular, inspections must be strengthened when spinning new varieties.
(2) If the color difference is caused by not clearing off the remaining strips when changing varieties, you can formulate operating specifications (the original remaining strips must be removed before changing varieties) and drive. The team leader shall organize an inspection beforehand, and prevent and treat it by the method of driving only after passing the test.
(3) Strict management, standardized operations, and strengthening of color differences caused by failure to use the color of the roving tube in accordance with the regulations, resulting in the roving flowing into the next process and mixing with other varieties, can be adopted Prevention and control through inspection and assessment.
Spinning process
(1) Use of wrong roving , or the wrong roving is used due to errors in the previous process markings. The color difference caused by this process is not monitored and tracked. Strict operation methods can be adopted to proofread the pre- and post-process markings and check whether the color of each roving and tube is consistent, especially for new varieties. It is necessary to strengthen inspection and other measures to prevent and control.
(2) Strict management, standardized operations, and strengthening of color differences caused by failure to use the color of the spun yarn tube in accordance with the regulations, resulting in the spun yarn flowing into the next process and mixing with other varieties, can be adopted Prevention and control through inspection and assessment.
(3) For color differences caused by weak twist yarn, additional equipment maintenance and maintenance can be adopted to eliminate the causes of weak twist, and quality control inspection and tracking can be strengthened to eliminate weak twist. Use spindles to prevent and treat it.
(4) Color differences caused by the wrong use of doffing workers’ veils can be prevented by strictly implementing operating management regulations and strengthening inspections and assessments.
(5) The color difference caused by the bellows flowers of different varieties of spun yarns are not strictly separated and used incorrectly when reused, can be prevented and cured by strictly implementing the management regulations for returning flowers and strengthening inspection and assessment.
(6) When changing varieties of spun yarn, the bellows flowers of the previous variety are not removed cleanly and the color difference caused by mixing with the next variety can be inspected by the shift leader before starting the car. , to prevent and treat it by using the method of driving only after you are qualified.
Winding process
(1) The wrong bobbin is inserted manually, or the wrong bobbin is used due to errors in the process identification , the color difference caused by this process is not monitored and tracked. Strict operation methods can be adopted to prevent and cure the color difference, such as proofreading the pre- and post-process marks, checking whether the color of each bobbin and tube is consistent, especially when spinning new varieties.
(2) For color differences caused by failure to use paper tube colors in accordance with regulations, resulting in the cone yarn being mixed with other varieties or cone yarns of similar colors and being packaged incorrectly, strict management, standardized operations, and similar colors can be adopted Prevention and control measures include staggered placement of varieties and enhanced inspection and assessment.
(3) The difference in winding density is also one of the factors causing color difference in package yarn dyeing. The winding density of the package yarn and the inner and outer layers of the package yarn is uneven, and the dye liquor cannot evenly penetrate into the yarn layer during dyeing, which will cause color difference and color flowers. Therefore, it is necessary to ensure the stability and stability of the tension during the winding process of the package yarn. consistency.
In short, as long as every detail of the whole spinning process is grasped, the color difference of colored spinning can be prevented. </p
