Spinning yarn is the final product of spinning production, and its quality directly affects subsequent processing and the quality of fabrics. The quality of spinning yarn is not only related to the technology, mechanical status, operation and other technical management work of the spinning process, but is also affected by the quality of semi-finished products in the pre-spinning, carding, fine, doubling and roughing processes. Therefore, in order to improve the quality of spinning, in addition to strengthening the control of the process conditions, mechanical conditions, temperature and humidity conditions, and production operations of the spinning workshop, we must also pay attention to the quality of semi-finished products in each process.
Production practice has proved that the unevenness of medium and long segments of spun yarn occurs in the rear area of the drafting device of the spinning frame and the front area of the drafting device of the roving frame; unevenness of long segments mainly occurs Since the roving and previous processes, some of them occur in the rear area of the drafting device of the spinning frame; short-segment unevenness mainly occurs in the front area of the drafting device of the spinning frame.
The unevenness of spun yarn is caused by many factors. Therefore, it is necessary to improve the design of the drafting device, improve the ability to control fiber movement, reduce drafting waves; and strengthen equipment management. , Ensure that the machine is in good operating condition, reduce mechanical waves; strengthen the mixing, opening, impurity removal, carding of raw materials, reasonably control the ration of semi-finished products in each process, and improve the quality of semi-finished products, etc., are all measures to improve the uniformity of the yarn. fundamental way.
01 Reasonable selection of process parameters
Production should be based on the characteristics of the product, the nature of the spinning raw materials, the structure of the roving and the The type of drafting device used is determined through comparative spinning tests to determine reasonable process parameters. When the yarn quality requirements are high but necessary effective measures are lacking, the total draft and partial draft distribution should not be close to the upper limit allowed by the machine model, and should be controlled to be smaller to help improve the yarn evenness. The roller spacing, the feed roving quantity, and the drafting pattern should all be adapted to the local drafting multiple. Roller pressure should be stable and uniform to ensure stable drafting efficiency.
02 Reasonably arrange the friction boundary
Under certain conditions of drafting type, the distribution characteristics of the friction boundary have been basically fixed , but appropriately adjusting the distance between the draft rollers and moving the rubber rollers forward or backward can change the distribution of the friction force boundary and improve the control of the fibers.
03 Use the collector correctly
Using the collector can shrink the width of the whiskers during the drafting process and prevent the edges of the whiskers. The loss of fibers reduces fly strands, allowing the strands to be twisted in a relatively compact state, making the yarn structure tight and smooth, reducing hairiness and improving strength. However, if used and managed improperly, the collector will “jump” or “turn over”, resulting in increased yarn defects, reduced yarn quality, increased hairiness and end breaks. Because the collector is equivalent to the additional friction boundary in the front area, its stability directly affects the evenness quality of the yarn; because the whiskers fed into the apron drafting area are moved left and right by the traverse device, when the collector outlet If it does not match the movement trajectory of the whiskers, the whiskers will be shaved and the straight fibers will become bent and entangled, resulting in yarn defects and hairiness. Therefore, the use and management of aggregators must be strengthened in production.
04 Strictly control the quantity
Strengthen the mixing of raw materials, strictly control the quantity of semi-finished products before spinning, and reduce weight unevenness; reasonable Master the combined number of semi-finished products and improve fiber straightness; use an appropriate type of collector to strengthen the control of edge fibers so that the fibers have good straightness during drafting to minimize drafting waves and improve Evenness of spun yarn.
05 Strengthen mechanical maintenance work
The working status of the drafting component is the main factor affecting the yarn evenness, and it must be Strengthen the maintenance and regular inspection of drafting components to ensure the accurate position of the distance and related components. Wearable parts need to be replaced regularly to ensure that the machine is in good operating condition. </p
