In an era of increasingly fierce competition in the textile industry, the market has higher and higher requirements for product quality and user standards have become stricter. Many companies are constantly updating their equipment while using new spinning equipment and adapting to different spinning conditions. The performance characteristics of yarn equipment are configured with suitable spinning technology, and product quality has been steadily improved. The author explains its performance characteristics from the aspects of upper and lower pins, new collectors, pressure rod spacers, etc., analyzes and discusses the requirements and adaptability of spinning equipment to the process, and verifies it through experiments.
New upper and lower pins
1.1 Carbon upper pins
Our company The upper pin currently used is DL14270. Compared with the previously used SX3-6833T, the jaw surface of DL14270 has been widened from 1.7 mm to 3.5 mm or 4.0 mm. This can increase the apron jaw pressure, and the size of the jaw pressure directly affects According to this characteristic, the tightness of the strands and the control of floating fibers can adapt to the requirements of modern new roving frames for heavy weight and large twist. It can better hold the fibers, stabilize the fiber speed change point, and reduce the risk of drafting. The increase in force causes vibration of the upper pin assembly to prevent the generation of mechanical waves.
For this reason, we conducted spinning tests on the upper pins with two jaw surface widths (the lower pin is a new type of lower pin), and the variety is C 16.2 tex knitting yarn.
The test results show that: compared with the upper pin jaw surface width of 3.5 mm and 1.7 mm, the straightness is reduced by nearly 0.5 percentage points, and the details and thick parts are significantly reduced.
1.2 New lower pin
The lower rubber ring pin is divided into traditional lower pin and new lower pin , the two lower pin geometries are different. From a design perspective, the new lower pin is characterized by a wider arched elastic layer, which is 1.5 mm wider than the traditional lower pin, and the jaw plane width is shortened by 2 mm. Its geometric shape is very beneficial to strengthening the friction boundary of the rubber ring jaw. , which is conducive to controlling the floating fibers in the apron jaw, increasing the pressure in the middle of the apron, increasing the tightness of the roving entering the apron jaw, controlling the early speed change of the fiber, and being beneficial to the evenness of the evenness. The new type of down-selling has a strong ability to control fibers. It has obvious advantages for raw materials with poor fiber uniformity and high velvet. It can improve the production environment and reduce the production cost of enterprises.
When spinning chemical fiber raw materials with good uniformity, the yarn quality is improved, but the advantage is not obvious. The front edge of the lower pin is thinned and the platform position is relatively lowered, which reduces the anti-encirclement arc of the fiber on the rubber roller, which is beneficial to controlling the fiber movement and improving the yarn quality. Since the lower pin has enhanced control over the middle part of the apron, the process requires that the gripping force of the front roller jaws be increased at the same time, otherwise hard yarn will easily come out.
Through experiments, it was found that the new type of bottom pin has improved yarn quality compared with ordinary bottom pins, and the cotton varieties have more obvious advantages than the viscose varieties with good spinning uniformity.
1.3 Reasonable optimization process configuration of upper and lower pins
What we use The jaw surface width of the upper pin DL14270 is 3.5 mm and 4.0 mm. The lower pin has a new lower pin and an ordinary lower pin. According to their respective performance characteristics, four groups were tested when spinning 18.2 tex warp yarn. Through the test, it can be seen that the reasonable upper and lower pins Pin configuration has a great impact on yarn quality.
The results show: Comparison of two process configurations: the upper pin with a jaw surface width of 3.5 mm and the new lower pin, and the upper pin with a jaw surface width of 4.0 mm and the ordinary lower pin. Reasonable.
Selection of new collectors
2.1 Performance characteristics of new collectors
The collectors we use extensively are new frame-type hanging collectors. Compared with traditional line contact collectors, the new collectors have a larger heat dissipation space, making the collectors more The rubber roller easily dissipates heat during running friction, which reduces the phenomenon of the rubber roller heating and electrostatically adsorbing fibers; the radius of curvature is large, the contact surface with the rubber roller is increased, and it is not easy to deviate, and is conducive to the use of large-diameter rubber rollers; it is heavy and durable Weighing, the line contact type collector is 1.01 g/piece, and the new type collector is 1.29 g/piece, which is 0.28 g/piece heavier than the line contact type, and the height is 1 mm higher than the line contact type collector. Therefore, the new collector has enhanced shelving stability, a stable center of gravity during operation, and flexible movement of the collector, which solves the problem of the collector being light and wandering.
2.2 The use and process adaptability of collectors
Collectors The size of the opening should adapt to the spinning number, draft multiple and the distance between the front roller rubber roller nip and the collector; the installation of the collector is related to the length of the floating area.
The length of the floating area is 10.5 mm. When installing the collector, the floating gap is small and the collector is not easy to swim, but it is easy to hit the rubber roller and rubber ring, deflection and accumulation, resulting in broken ends and Deterioration of dryness. After we set the middle rubber roller 2 mm behind and changed the floating area to 12.5 mm, the collector played a better role. The size of the collector gap is also related to the diameter of the front rubber roller. If the diameter of the rubber roller is large, the distance from the front edge of the upper pin to the outer surface of the rubber roller is short, and the collector gap is small; if the diameter of the rubber roller is small, the gap will be large. When the movement of the collector is affected, the forward stroke of the front rubber roller or the position of the middle rubber roller can be appropriately adjusted.
After testing, the hairiness H value dropped significantly after the new collector was selected, and the yarn CV, thousand-meter thick places, details, neps, etc. were significantly improved.
The use of pressure rod spacers
The pressure rod spacers provide additional friction in the main drafting area of the spun yarn. The technical measures of the industry are used to strengthen the control of floating fibers. The mechanism of use is to use the friction force to control the movement of floating fibers.
After using the pressure rod spacer, the CV of the finished yarn dropped by nearly 1 percentage point.The knots, thick spots, and neps have all decreased, and the effect is obvious. However, the hairiness H value has deteriorated, and the CVb between tubes has increased. The 2.75 pressure rod spacing block has serious hard ends and many broken ends. The process technology needs to be adjusted.
3.1 Hairiness problem
Hairiness after using pressure rod spacer block After analysis, it is believed that the main reason is that the pressure rod divides the floating area into two parts, which strengthens the control and is conducive to the straightening of the fibers of the rear hook. However, when the front hook passes through the pressure rod, the elastic recovery force is large, forming chaotic fibers, resulting in increased speed. The fibers exposed during twisting and winding form hairiness. To this end, the following measures are taken: try to use small-diameter yarn guide hooks; increase the weight of the traveler without affecting end breakage, and make three concentrics; use low-hardness rubber rollers to strengthen fiber control. After adjustment, the hairiness H index is significantly improved, and the variety is C 18.2 tex warp yarn.
3.2 Hard head problem
The pressure rod divides the floating zone into Two small floating areas, shortened in length, enhanced in control, easy to produce hard heads. To solve the problem of reducing the drafting force and increasing the holding force, the pressure rod spacing block can be increased, or “two large and one small” can be adopted (large back roller spacing, large back drafting multiple, small roving twist Coefficient) process, the hard head phenomenon can be solved.
After using pressure rod spacers, the yarn quality indicators have been improved. Through process and technical adjustments, the hairiness indicators and the phenomenon of hard ends have been solved. However, as the CVb between tubes increases, specific measures need to be controlled from various aspects such as equipment.
Conclusion
Each spinning equipment has its own Features, and each piece of equipment has unique performance in the update and development. Everything is related. When using spinning equipment, we must consider the cooperation with process technology and the requirements for process adaptability. Only by giving full play to the role of spinning equipment can we effectively promote quality improvement. </p
