How to prevent the yarn quality from falling? The following three points are indispensable

It is well-known that factors such as combed cylinder or top comb damage, intarsia, etc., can lead to an increase in the comber noil percentage, long fiber damage, and loss, which in turn deteriorates yarn quality. At present, the measures taken by textile companies to solve the damage and intarsia of combed cylinders and top combs are: properly adjusting the depth of brush insertion into the cylinder, increasing the speed of the brush, and replacing the brush with a small diameter or a sparse brown hair and poor elasticity. Prolong the cleaning interval of the brushes, and shorten the cleaning cycle of cylinders and top combs while replacing damaged and intarsia severe carding equipment. In order to better solve the problems of combed cylinders, top comb damage and intarsia, Xiao Bian has provided relevant knowledge for everyone.

Optimize cylinder rack density arrangement

Strengthen front rack racking efficiency

Embedded zigzag overall cylinder is widely used due to its strong spinning properties. In order to ensure that Cylling can maximize its combing performance, it is possible to rationally dispose and appropriately increase the rack density of the front carding area within the limited combing area of ​​Xilin, and to strengthen the combing performance such as puncture, grabbing, and opening of the front rack. At the same time, the close arrangement of the racks in the front area is avoided, the combing performance of the combing area is reduced, and the phenomenon that the comber breaks the holes in the output cotton net at a high speed is prevented. In this regard, some foreign textile machinery manufacturers have made some optimizations. For example, Scherrer optimized the arrangement of pin angles and needle densities: 90 series combed cylinders with a face angle of 90 degrees. The first two groups had a rack density of 25 teeth / cm2 and 62 teeth / cm2. The carding point can be increased by changing the density of the back area rack. The maximum carding point for this series of cylinders is only 30305 points, while the newly developed 96 series cylinders have a rack density of 53 teeth / cm2, 88 teeth / cm2 and a maximum carding point of 38980 points. At the same time, while grasping the combing gradient configuration, we should appropriately increase the density of the rear rack to achieve the elimination of smaller neps, to achieve fiber singleness, improve the neat neps, linter removal efficiency, is conducive to yarn quality Overall improvement.

The reasonable arrangement of the rack density in the front and back areas of combed cylinders and the appropriate increase in the total number of combing points in the cylinders have a great influence on the quality of the yarns for spinning and spinning, and it has also attracted the attention of technical staff of spinning mills. At the same time, combing at home and abroad In order to cope with the rapid development of modern high-performance combing machines, manufacturers of carding components actively researched and developed high-quality combing combing components.

How to scientifically and reasonably configure the rack density and the total combing point of each group according to the customer's needs? A spinning mill increased the total carding point of the five-divided Xilin with a face angle of 90 degrees in Xilin to 50,000 points (mainly increasing the density of the rack in the combing area), and the quality of the drive output of the machine was poor. The speed of the vehicle dropped from 380 pounds / min to 300 pips / min before the normal output of the net was obtained, and the density of the first two sets of racks was appropriately increased. For example, the density of the three sets of racks was increased. The total combing point of Xilin is 47,000 , which can meet the process requirements of rapid puncture, opening and combing, and the yarn quality can reduce the kilogram of km+200% by 25%~30% . However, due to the large density of the Cylinder rack in the middle and back areas, it will lead to too thin teeth and low strength. It is difficult to adapt to high speed and heavy quantitative process requirements. The use time is not long. The third group of racks is the first row of teeth. The phenomenon of broken teeth will appear in the film, leading to the incarnation phenomenon of cylinders. From this point of view, the total combing point of Xilin is not necessarily the bigger the better. Instead, the optimum packing arrangement and total combing point should be determined experimentally depending on the condition of the processed fiber and the quality of the customer.

Rack sharpness degrades quality

Reasonably adjust the depth of inserting Xilin

In order to cater to the demand of total combing points in combing combing components, the processing of the cylinder rack density has become increasingly larger, the total number of carding points has become higher, the tooth plates have become thinner, and the strength of the tooth plates has gradually decreased. Although combing component manufacturers have made unremitting efforts in material selection, process optimization and surface summative processing of combing components, they still cannot resolve the contradiction between the high output of high-performance combers and the shortened degradation period of sharpness of cylinder racks. This is due to the use of variable-speed cylinder comb combing combing the entire process of combing instantaneous linear speed ( 1.38 ~ 2.2 times). Taking a speed of 500 pounds per minute as an example, the actual carding speed is equivalent to a constant speed combing cylinder of 690 pliers / minute to 1100 pliers / minute.

When the cylinder intarsia is embedded in the overall zigzag indentation, it usually has a tooth surface angle of 90 degrees. The five-divided cylinder intarsia occurs in the first and third groups. The tooth surface angle is 90 degrees and the four- divided cylinders. The inflorescence occurred in the second group and observation with a 60- fold magnifying glass showed that the first row of teeth of the set of inlaid racks had been damaged. If the intarsia caused by the damage of the cylinder rack can not be solved by other technical measures, such as adjusting the depth of the brush inserted into the cylinder, increasing the speed of the brush, and raising the cleaning time of the brush, only the dismantling of the old rack and the replacement of new ones Rack can achieve its purpose. Once the sharpness of cylinder rack is degraded or the effect of cylinder intarsia on the quality of yarn formed due to the damage of the rack teeth is larger, the performance is the same in the case of the cotton gauge and the cylinder gauge The cotton harvest rate increased by about 0.5 %. Production practices show that the percentage of short fibers in combed strips and comb slivers increases, and the yarn quality deteriorates rapidly.

When dealing with the conventional technical measures of the inulin inlay is not effective, do not rush to adjust the depth of the brush into the cylinder, this is not only not conducive to the treatment of inulin, but will increase the brown hair brush damage, shorten the brush Service life. If the brush is used properly, the imported brush can be used for 6 to 7 years, and the domestic brush can be used for 4 to 5 years. The use of brush guides is equivalent to a 1 mm increase in the depth of the brush inserted into the cylinder . This technology effectively and thoroughly removes the intarsia from the cylinder pin. We have now completely replaced the domestic brush. This is mainly due to the poor elasticity of the domestic brush. After a period of use, the brown hair of the brush will fall to the side, greatly reducing the cleaning performance of the brush on the cylinder.

Replacement rack extends cylinder life

Strict control of gauge to reduce nep

The general combing point we use is ( 41,186 points). The first and second groups of Xilin racks have the same specifications, the rack sloping blades are all beige, and the first group and the first row of cylinder rack ribs are It is easy to damage. When the use time of cylinder is about 8 months, the first and second groups of cylinder racks can be used interchangeably. This can extend the cylinder racks while ensuring the cleanliness and zero defects of cylinder surfaces. Service life. When replacing the cylinder racks in a unified manner, some of the cylinder racks with good conditions (rack tooth surface damage, no inlays, and no contaminants) can be selected and stored so that they can be replaced at any time. In order to ensure zero defects in the cleanliness of the cylinder surface, the purpose of zero defects in the equipment, zero defects in quality, and zero waste in costs.

While appropriately increasing the density of cylinder racks in the front and back areas, it is important to strictly control the gauge spacing of the cylinders (front zone, middle zone, and back zone) at the three points, and it is very important to combine the two organically. Xilin carding gauge is small, can reduce the yarn nep, but too small can easily cause fiber damage, and the risk of damage to the cylinder rack is also greatly increased. Therefore, the determination of cylinder gauge bar spacing should be based on different manufacturers of cylinder, small volume and customer quality requirements to find the best combination of points.

During the process design of the combing preparation process, priority should be given to improving the parallelism, straightness and resolution of the cotton skein plexifilamentary fiber. In the process of combing and unwinding, no sticking and fiber damage are needed, which is beneficial to saving cotton and reducing the number of cylinders. Rack damage and other factors.

All employees of the company adhere to the requirements of lean management and take the initiative to participate in the maintenance activities of the equipment, so that combed cylinders are always in an intarsia-free, non-injury state, and the cylinder surface can always be in a state of cleanliness and zero defect. Work under.

In production practice, the lean management course's TPM , zero-defect rule, TPM framework, self-preservation and role, professional preservation, quality assurance, and independent inspection techniques are advanced management concepts. An endless process of excellence, if we also adhere to the zero defect principle in our work, everyone insists on doing the right thing for the first time. If defects do not occur or flow to the next process or other positions, then our work can be reduced. Many of the costs of processing defects and mistakes, work quality and work efficiency can also be greatly improved, and economic benefits will also increase significantly.

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