1 Cone tooth clothing design concept and features
1.1 Beveled Card Clothing Features
A needle tooth with a small tooth top area, a strong puncture ability, and a clear corner has a strong carding ability for the fiber, but also has a large damage to the fiber. The new type of beveled wire cloth has a small tooth top area and the edges and corners become circular arc designs. Not only the full combing of the fibers is achieved, but also the flexible carding is achieved, both are taken into account, and the protection of the fibers is strengthened.
1.2 Cone tooth cloth and ordinary clothing cloth contrast
The beveled clothing is a beveled treatment on the basis of the ordinary clothing. Its quality is compared with that of the ordinary clothing. It has very obvious advantages. Specific comparisons are shown in Table 1.
Analysis in the table: General clothing, flat top of the tooth tip is a plane, the edge is a right angle, reducing the top area, can improve the combing puncture ability, but more fiber damage. Sharp edges and corners, good sharpness, but greater damage to the fiber. Closely spaced, strong combing, reliance on combing to reduce neps, but the increase in short fibers and excessive combing are inevitable problems.
1.3 Mechanism of Stable Quality of Beveled Card Clothing
The beveled wire cloth has a small tooth top area, a tooth tip taper tooth shape, a good pin tooth finish, an arc edge transition, eases the impact on the fiber, and the surface is smooth, easy to airflow through, reduce the resistance to the fiber, Extended service life. It is possible to open the fibers with proper spacing and avoid the potential damage caused by the tightly spaced strong comb, which improves the intrinsic quality of the strips. See Figure 1 for details.
2 Cone tooth card combing analysis of the impact of linter and neps
2.1 Beveled Card Fabric Softening Reduces Fiber Damage
The subject of the card clothing is the fibrous layer (knife roller combing), the fiber bundle (card cover carding), and the pseudo neps (cylinder and cover plate) in the fiber. The adjacent stitches of the carding machine are arranged with crossing, parallel, relative movement between the needle teeth and different directions, and the interaction generates impact force, friction force and carding force on the fibers, penetrates the decomposing fiber bundles, combs into single fibers, and combs open. Neps, during which the force is too small, affect the needle-to-fiber grasping, release transfer, resulting in an increase in short fiber and nep.
2.2 Bevel tooth sharpness improves puncture ability
The sharpness of the needle teeth is concentrated on the tip of the teeth, that is, the strength, hardness, and wear resistance of the tip. Needle-to-tooth teeth must be fully combed, but also to prevent over-strength carding. The needle teeth are three-dimensional, and the size of the tooth top area is the degree of sharpness of the cloth, ie, the smaller the sharpness, the better the wear resistance of the tooth tip (working edge), the edge is generally a right angle, and the good finish of the needle teeth is a must for the metal wire cloth. Preparation conditions. Tips tend to be short and shallow, reducing the tip area and maintaining sharp edges and sharp edges, can improve the carding puncture ability, but to prevent fiber damage. The beveled needle tip is sharper, which facilitates puncture and reduces damage, providing a favorable condition for fine combing.
2.3 bevel gear surface treatment conducive to fiber through
The deep tooth depth of Xilin is closely related to the total height, and the total height develops in the direction of short and deep teeth. High tooth height, high friction and short life span. The fiber is easily between needles and teeth. The fibers are negatively combed (drag and comb) and transferred badly. The teeth are short, and the fibers are strongly attacked at the tip of the needle and easy to transfer. Carding effect is good. Tofu is the other way around, but consider rolling.
When the angle is small, the fibers should not sink into the root of the tooth, and the ability to transfer and release the fibers is enhanced, but the ability to hold the card is poor. When the anteroposterior angle is too large, the transfer rate is high, but the rake angle is too large, which affects the even mixing and the combing effect. The combing and transfer rates should be comprehensively considered. Specific specifications shown in Figure 2.
The surface of the beveled clothing cloth is plasma treated, and the arc is excessive, which reduces the friction between the fiber and the needle teeth, which is beneficial to the combing.
2.4 Beveled wire cloth achieves less fiber damage due to increased density
The increase in tooth density of cylinders can increase the ability of fiber gripping and carding, increase the number of teeth acting on each fiber, and reduce the wear and degradation of the clothing. However, the frictional resistance to fibers increases, and it is easy to insert seeds and reduce the ability to transfer the card. The increase in transverse tooth density, correspondingly reduced the thickness of the base, can increase the ability to cut carding, reduce nep, has a more significant effect on improving the quality. The carding and transfer function of the doffer's denticule is different, and it is mainly based on appropriateness. In the case of easy-to-handle and easy-displacement, it needs to be optimized with the cylinder and the spun fiber. The beveled corners are beveled and the damage to the fibers after encryption is less.
3 Practice of improving the quality of beveled clothing
3.1 Selection of needle roller clothing
In the cotton layer, 70% to 80% of the cotton bundles are decomposed into single fibers by a licker-in roll. The combing action of the licker-in is very strong and it is also the key point of the process. Each increase or decrease in speed by 5% to 7% will cause major changes in neps and short fibers. In the process of spinning, optimizing according to the conditions of raw materials and quality often results in obvious effects, but the consequences of damage have not been optimized. The taper roller cloth can be gently combed at the source to ease this problem. See Table 2 for comparison.
Analysis in the table: Use cone tooth AT5610 × 05011 clothing, lint roller to cotton plate spacing, speed at 760 r/min, processing high impurity 2.3% US cotton, the effect is still better than non-conical tooth clothing.
3.2 Selection of Conical Cylinder and Tapered Crimps
The cylinder and cover plate interact to achieve flexible carding between the needle surfaces. Xilin bevel gear cloth has a smaller tooth tip area, strong puncture ability, rounded edge transition, smooth surface, easy air flow, reduced resistance to fibers, easy release of fibers, and prolonged service life. It is possible to open fibers under large gauge to avoid fiber damage caused by strong carding and to reduce nep and short fibers. Small tooth tip, AC2030×01740 cloth, large longitudinal teeth, narrow base, small working angle, strong adaptability, not only suitable for long-staple cotton and fine cotton, but also adapt to high speed. In the selection process, cylinder and cover plates are the key to flexible carding and upgrading of the carding machine. After the active cover plate enters the working area for a period of time, the fibers are gradually filled with fibers and impurities to generate knots. The cover plate adopts an agglomerated type, which ensures the gradual combing of the concentrated carding of the cotton toe and improves the combing effect. In the FA221E type carding machine and the MCH52, the quality of viscose yarn is shown in Table 3.
3.3 Bevel teeth increase densification Improve combing ability
The secondary cleaning of the raw materials and the carding process of the dyed yarns and the combing process are particularities of the carding object; color spinning yarns have very high requirements for color knots and strength; it is difficult to eliminate neps and protect fiber damage during carding. Cloth density is the basic requirement for color spinning. The trend of the development of cylinder clothing is to increase the longitudinal tooth pitch and reduce the lateral tooth pitch, so as to achieve both carding and short-lasting effects. FA201 model configuration: with cotton grade 2.3; average fiber length 28 mm; clothing configuration: cone tooth Xilin AC2030 × 01550, doffer AD4030 × 01890, cover TP45; color spinning varieties: C 14.8 tex ~ 29.5tex; raw cotton Cashmere rate: 19%. The main close spacing process: Xilin 360 r/min, the spur roller 800 r/min, the cover plate ~ cylinder 0.13 mm, 0.10 mm, 0.10 mm, 0.09 mm, 0.10 mm; the cylinder - doffer 0.10 mm; front fixed cover Plate - Tin Lin 0.13 mm.
Analysis of the problem: 18/12 sticks/g sliver color, and 24.5% short fiber. The clothing life cycle is 8 months. Due to the strict control of color spinning on neps, the existing tooth density can not meet the needs of combing, and the use of tooth-encrypted card clothing, but the use of ordinary clothing cloth encryption is too large, resulting in an increase of short fibers of the fiber. Cone toothed cloth AC2030 × 1540. AC2040 × 01740 of the clothing, cover plate encrypted to MCH55, Xilin ~ cover spacing 0.15 mm, 0.13 mm, 0.13 mm, 0.13 mm, 0.15 mm, to meet the combing needs. Clothing life of 1 to 3 years. The specific comparison is shown in Table 4.
The analysis in the table: Beveled wire cloth, enhanced combing effect; after the cover plate is installed before the fiber is added, the fibers of the leaking comb can be supplemented and combed before the fiber enters into the distance of the sillin doffer. It provides conditions for the removal of impurities and the removal of short fibers, which can effectively improve product quality.
3.4 The practice of bevel teeth to improve strength
The beveled needle cloth is processed by a special process, has no run-in period and long service life, which helps to reduce short fibers, increase the production rate and yarn strength, and improve the yarn quality. In the cotton carding FA231 carding machine, see Table 5 for the specific quality comparison of the processed fine cotton.
Analysis in the table: Improved stemming and increased strength.
4 Conclusion
The new beveled tooth cloth has a small tooth top area and a beveled tooth beveling treatment. The tooth shape is conical and the edge is a transitional arc. The puncture effect during the carding process is good, with less damage fibers and less short fiber production. In specific use, through reasonable selection and cooperation of craftsmanship, negative combing of tightly spaced and strong combing can be avoided, and moderately spaced and strong combing can be achieved, which can effectively control the increase of short nap and nep and reduce the use of cotton. The amount of carding machine to achieve high quality and low output.
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