Development of polynosic fiber pure knitting yarn

0 Foreword

With the continuous development of science and technology and the improvement of people’s living standards, people’s requirements for clothing have undergone fundamental changes. From the original requirement of covering the body to keep out the cold, we have entered a new stage of functional fabrics that focus on comfort, green and environmental protection. . In recent years, the emergence of new textile materials has given them all the characteristics of traditional natural fibers, as well as special properties, such as dryness, drape, breathability, coolness, moisture absorption and perspiration, and softness. The development and research of new textile materials have made the functions of textiles more and more perfect, and remarkable achievements have been made in the development of new materials. The developed Richcel-polynosic fiber 32s knitting yarn has received great attention in the market.

Richcel-polynosic fiber is the best choice for knitted fabrics. The fabric feels soft, smooth, delicate, moisture-absorbent, perspiration-wicking, and has excellent skin-friendly feel and comfort; At the same time, the fiber has a high dry modulus. The wrinkle resistance and alkali resistance of the fabric are improved compared with other cellulose fibers, and the elasticity and dimensional stability are excellent. Take full advantage of these excellent characteristics. It can design ideal high-end knitted fabrics with beautiful appearance, excellent internal quality and good wearing performance.

1 Raw material properties, yarn specifications and process flow
1.1 Relevant main physical indicators of Polynosic fiber: Specification 1.67dtex×38mm
Dry breaking strength 3.9cN/dtex
Wet breaking strength 3.1cN/dtex .3 Process flow: A2002C type cotton picking machine→A006B type cotton blending machine→A036C type combing needle type cotton opener→A092A type cotton feeder→A076C type rolling machine→A186C type carding machine→FA306 type combined Strip frame (two lanes) → A456D roving frame → FAS06 spinning frame → ESPERO-E automatic winding machine

2 Process configuration and technical measures of each process
2.1 Open cleaning cotton
Polynosic fiber is a new type of high wet modulus cellulose fiber. It is a pulp made from 100% high-purity refined wood pulp. It is a new type of fiber produced using Japan’s Toyobo high-moisture modulus fiber’s special technology. However, because the fiber is easy to tangle, easily produce neps, and the fiber cohesion is poor, so Blower opening should not be too strong. Appropriately reduce the speed of the beater and enlarge the distance between the cotton feed roller and the beater to reduce damage to the fiber. Strengthen carding of fibers and reduce the production of neps. The distance between the A002C blade and the rib is 2mm, and the beater speed of each component is about 15% lower than the speed when spinning ordinary polyester. A036C uses a combing needle beater, the beater speed is 450 rpm, and the distance between the beater and the cotton feed roller is adjusted to 3mm, reducing the number of fiber strikes and strengthening opening and carding. The cotton roll adopts a light basis weight, with a designed dry weight of 365 g/m, in order to achieve full opening and reduce the carding and carding load; in order to prevent the roll from sticking, an appropriate number of rovings are added between the middle layers of the roll. After the roll is rolled, the weight unevenness reaches 0.7%. It meets the quality requirements of subsequent processes.
2.2 Carding
The carding process adopts the process principles of light quantity, low speed, fast transfer and small pressure to prevent holes in the cotton web, reduce fiber damage and the increase of short lint, and appropriately Increase the speed ratio of the licker-in roller and the cylinder to transfer the fibers quickly and avoid repeated blows and carding of the fibers. The use of special card clothing for chemical fibers can improve the clarity of the cotton mesh. It also improves fiber straightening and parallelism and reduces the number of neps in the sliver. The drafting force is appropriately low, which can make the cotton net clear, not fall into the net, not entangled and the sliver is even. The sliver weight is 17g/5m, the cylinder speed is 330 rpm, the licker-in speed is 835 rpm, the doffer speed is 15 rpm, cylinder, cover plate.The distances are 0.36, 0.30, 0.30, O. 30.O. 36mm, cylinder-doffer spacing O. 18mm, give the cotton board a licker-in roller spacing of 0.20mm. The unevenness of the raw sliver is 11.5%, and the neps are 2/g.
2.3 Drawing
Because there are many fiber hooks in the raw sliver and the structure is chaotic, in order to mix the fibers evenly, improve the dryness, and improve the straightness, parallelism and uniformity of the fibers, 6 parallel drawings are used in the head. Combined, the second pass uses 8 combined to achieve a full combining effect to help reduce weight unevenness. The roller spacing is appropriately enlarged to improve evenness, and the draft distribution is reasonable to improve fiber straightening and parallelism; appropriate Increase the pressure to ensure sufficient holding force and drafting force to ensure stable fiber movement during the drafting process and improve the evenness level. And the use of heavy pressure can reduce the sliver-slipping phenomenon during drafting, improve drafting efficiency and fiber straightening and parallelism. Therefore, the drawing frame adopts the process principles of heavy pressure, medium weight, large spacing, and low speed. The process parameters are as follows:
head and: design dry weight 18.08 grams/5 meters, 6 merges, the back of the rear area is 1.732 times, the Rolla is 14 × 15, and the speed of the former Rlara is 935 rpm.
At the end: design dry weight 16.82 grams / 5 meters, 8 ties, the back of the region is 1.546 times, the distance between the Rogla is 14 × 15, and the former Ralah speed is 935 rpm. The unevenness of cooked strips is 12.7%.
2.4 Coarse gauze
The design of the rough gauze is to further improve the fiber extension and parallel separation, improve drying, and control the elongation. The draft ratio in the rear area is 1.35 times to reduce the occurrence of thick spots. The twist of the roving is appropriately large to control the elongation and reduce accidental drafting. Properly increase the moisture regain of the roving to improve the intrinsic quality of the roving and thereby improve the quality of the finished yarn. The workshop temperature is controlled at 28.29~C. The relative humidity is controlled between 58-62% to reduce the adverse effects of static electricity. Therefore, the roving process adopts the process principle of “heavy pressure, appropriate high twist, and slow speed”. Its process parameters: design dry weight 4.06g/5m, roller spacing 27×29, roller speed 18l rpm, twist 3.85 twist/10cm, taking the above effective measures, the roving will not be dry. The uniformity rate is below 18.3%.
2.5 Fine gauze
The fine gauze process uses “slow speed, the small back zone holds multiple, and the Rogla spacing, small clamp port, medium pressure” process principles. Since the dry elongation and wet elongation of Polynosic fiber are slightly lower than those of polyester, Modal and other fibers, it is a high-strength, low-elongation fiber with slightly poor elasticity. There is almost no twist and shrinkage after spinning, so a lower spindle speed should be used in the spinning process. 14000 rpm, because the yarn is used for knitting, the twist of the finished yarn is easy to be small; select a smaller draft ratio in the back area and a large roller spacing in the back area to prevent hard ends during the spinning process and facilitate fiber control. To improve yarn evenness, increase yarn strength and reduce yarn strength CV value, small jaws and medium pressure are used to facilitate sliver drafting. Facilitates fiber control. The process parameters are as follows: the draft ratio of the rear area is 1.2, the roller spacing is 20×35, and the twist is 80 twists/10 cm. The 32s Polynosic fiber knitting yarn spun through the above technical measures has good quality: weight unevenness CV% 1.8%, breaking strength CV% 12.1%. The yarn evenness CV% is 13.8%, the details are 3, the thick places are 12, and the defects are 37. 2.6 Winding It is produced on Savio’s ESPERO-E automatic winding machine. The machine speed is appropriately reduced, the yarn tension is reduced, and the electronic yarn clearer process is tightly controlled.

3 Conclusion 3 . In recent years, our company has been unique in the use of new materials and new technologies. New, strange, special and excellent products have improved the company’s market competitiveness, and thus stayed far ahead in the fierce market competition.

Disclaimer:

Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.

AAAFilms, audios, and videos come from the Internet and do not represent the views of this website. Their copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.