Yarn hairiness is the main shortcoming of ring spinning. Yarn hairiness not only affects the appearance quality of ring spinning yarn, but is also the main factor affecting the appearance, feel and efficiency of the fabric. The main reason for the blocking head, controlling and reducing the hairiness of ring spinning yarn has become one of the problems that need to be solved urgently in ring spinning production. Therefore, it is particularly important to reduce yarn hairiness in the spinning process, and the selection of a variety of new equipment deserves attention.
Selection of new steel rings and travelers
Steel rings, The traveler is an important component for twisting and winding during the spinning process of the ring spinning machine. The quality of its cooperation will directly affect the spinning tension and the friction of the traveler on the spinning yarn. A replacement cycle of steel rings and travelers includes a maturation period, a stable period and a decline period. During the stable period, the cooperation between the steel ring and the traveler is good, the movement of the traveler is stable, the spinning tension fluctuation is small, the friction is small, and the hairiness of the spun yarn increases less; during the maturation and decline periods, the cooperation between the steel ring and the traveler is good. In poor condition, the spinning tension fluctuates greatly, the friction increases, and the hairiness of the spun yarn increases significantly.
The size of the wire ring directly affects the spatial position of the yarn channel. A large circle shape means a large space, a wide yarn channel, and the yarn is not easy to roll and shave the yarn. . Using GS type traveler for spinning, the number of hairiness is the least and the end breakage rate is small. Because the GS-type traveler has a low center of gravity, a wide track, smooth operation, and reduced hairiness; while the G-type traveler has a large ring shape and a wide yarn channel, but has a high center of gravity, unstable operation, and increased hairiness; the O-type traveler The center of gravity is low, but the channel is small, and it is easy to wedge the yarn, causing an increase in hairiness and an increase in the breakage rate; the cross-section of the Smooth, not prone to static electricity, with the least amount of hairiness.
From the perspective of reducing the dynamic friction coefficient, the circular cross-section has the smallest dynamic friction coefficient, but its heat dissipation and operating stability are poor, which is not conducive to reducing hairiness; the cross-section of the rectangular cross-section wire ring It is large, easy to dissipate heat, and moves smoothly, which helps reduce the chance of hairiness.
Compared with the conical steel ring, the yarn spun by the conical steel ring has less hairiness because the curvature radius of the conical steel ring is larger than that of the flat steel ring. , the contact area is correspondingly large, the movement stability is good, it is easy to dissipate heat and is wear-resistant, and the hairiness is less; compared with the fixed steel ring, the yarn spun by the rotary steel ring has less hairiness because of the rotation of the rotary steel ring. The friction coefficient between the traveler and the steel ring is reduced, and the relative speed between the rotating steel ring and the traveler is reduced, which is beneficial to the smooth operation of the traveler and reduces frictional heat generation; compared with the polished steel ring, the yarn hairiness of the yarn is reduced. The reason is that when the traveler runs on the pitted steel ring, the friction force is stable, the friction force changes little, and the hairiness of the spun yarn is significantly reduced.
The ceramic steel ring and traveler developed by the German Tec company can be used for up to 105 days without damage when the spindle speed is 17500r/min. Within a replacement cycle of steel rings and travelers, the spinning tension fluctuates little, the tension is very stable, the friction is small, and the hairiness of the spun yarn increases less. The porcelain-plated steel ring has good heat dissipation, is not easy to wear, has good stability, has low friction, and is not easy to shave the yarn.
The Orbit steel ring and traveler developed by Swiss Rieter Company are made of special wear-resistant materials. The contact area of the ring and traveler is increased by 4~ during design. 5 times. It has the advantages of long service life, wear resistance, low stress, and good heat dissipation ability. Under the conditions of use with a spindle speed of 25,000 r/min, the hairiness of the spun yarn increases less.
The fluorine-plated steel wire ring has a long service life. During operation, the thermal wear is small and the operation is smooth. The gas ring is easy to control, the maturation period and decline period are shortened, and the stable period is extended. , can reduce spun yarn breakage and reduce the amount of spun yarn hairiness; the surface hardness of the chromium-plated steel wire ring increases, the wear resistance is high, the maturation and decline periods are short, the stability period is long, and the long use cycle can reduce the spun yarn hairiness.
The new matt steel ring has high smoothness, good wear resistance, small friction coefficient, long service life, high fatigue resistance, good heat dissipation ability, and strong spinning suitability. It makes the traveler run stably, with small beating and vibration frequency and amplitude, wide channel, good stability, small spinning tension fluctuation, and can significantly reduce the hairiness of spinning yarn.
The working surface of the new alloy steel ring is balanced and smooth, with consistent surface roughness, stable friction coefficient, smooth operation, high surface hardness, good heat resistance and wear resistance, and its surface has a An extremely thin self-lubricating layer allows the traveler to operate under lubricated conditions. The new steel ring does not need a maturation period after being put on the train, which can reduce the hairiness of the spun yarn. In addition, the electroplated steel rings, sulfurized steel rings, fiberglass steel rings, Swiss Brack steel rings, American ceramic steel rings, etc. on the market are very effective in reducing spun yarn hairiness.
BC ring and traveler belong to the lower support multi-point contact, which has a large contact area, good heat dissipation, low pressure, small wear, and is not easy to burn out the traveler and stress Small, it is helpful to stabilize the spinning tension, make the traveler run stably, and reduce the hairiness of the spun yarn.
BC6 type steel rings and travelers have a long service life and few breakages. Due to the friction between the steel ring and the traveler, yarn hairiness is generated and significantly increased. The SUPER rolling traveler technology developed for this situation replaces the traditional traveler, turning the sliding friction between the steel ring and the traveler into rolling friction. ���, as a result, the hairiness of the spun yarn is significantly reduced.
Switzerland’s Hi-per-spin ring spinning machine uses electronic computer simulation to control the spinning speed of large, medium and small yarns in the entire spinning process, using infinitely variable speeds. , can effectively control the spinning tension, extend the service life of the traveler, help stabilize the spinning tension, make the traveler operate stably, and reduce the hairiness of the spun yarn.
Selection of new rubber rollers, yarn guide hooks and other equipment
Spinning During the yarn spinning process, the balloon and the separator plate collide and rub, which easily generates a large amount of static electricity, leading to an increase in the hairiness of the spun yarn. Different material properties, different degrees of wear and static electricity generation lead to different amounts of hairiness. The use of anti-static gauze screens and light-plated thin aluminum plates can reduce the hairiness of fine yarns.
The low-hardness rubber roller is soft on the outside and hard on the inside, and has good elasticity. It can increase the holding force of the front jaw, increase the contact area with the whiskers, and shorten the floating area and speed. Twist the triangle area to enhance the restraint of edge fibers. The inner pattern apron or the inner and outer pattern apron can increase the friction between the roller and the apron, reduce the probability of slippage and other undesirable phenomena, effectively control the movement of fibers during the drafting process, and strengthen the restraint and control of edge fibers. Therefore, The use of low hardness rubber rollers and internal pattern rubber rings can reduce the hairiness of fine yarns.
DSB-50 small-aperture yarn guide hook is chrome-plated, which has high wear resistance and reduced friction and heating. It can reduce the balloon tension of the spun yarn and make the yarn and guide The contact area of the yarn hook is reduced, which is beneficial to the transmission of yarn twist and can reduce the hairiness of the spun yarn. In addition, the use of ceramic-plated, enamel-plated, manganese steel, aluminum alloy and other small-aperture yarn guide hooks has a certain effect on reducing spun yarn hairiness. The friction coefficients of yarn guide hooks of different materials are different, and their heat dissipation performance and wear degree are also different. After the yarn guide hook is used for a period of time, its surface is prone to grooves due to wear and tear, and the smoothness decreases, resulting in yarn shaving and increased hairiness. Therefore, appropriate yarn guide hook materials should be selected during production to reduce the chance of hairiness.
Selecting an appropriate collector can control the fibers on both sides of the whisker and the fibers on the surface of the whisker, so as not to separate from the whisker, thus gathering fibers and increasing the number of fibers. The effect of the tightness of the slivers is to strengthen the control of floating fibers and prevent fiber diffusion, so that the yarn slivers are twisted in a tighter state and the spun yarns spun have less hairiness. The use of spiral balloon rings can change the shape of the balloon, causing the resulting spiral to rise clockwise, reducing the balloon pitch, thereby reducing the spinning tension and significantly reducing the amount of spun yarn hairiness. The new rib collector adds two ribs, which can reduce the contact area with the front rubber roller, easily dissipate heat, reduce the adverse effects of static electricity, reduce the adsorption with the front rubber roller, help eliminate short fibers, and can improve Evenness level reduces yarn hairiness. </p