Development of Outlast Modified Viscose Blended Yarn

Development of Outlast Modified Viscose Blended Yarn Jiang Yuedong Cao Dejin (Jiangsu TEDA Textile Co., Ltd.) pre-processes, rationally selects the production process, optimizes the configuration of various process parameters, selects relevant equipment in a targeted manner, and focuses on the winding process The parameters of the splicing were adjusted to ensure the quality of the splicing. Finally, the Outlast modified viscose/combed cotton 60/40 9.7 tex yarn was successfully spun, and the yarn quality satisfies the requirements for use.

In the increasingly fierce competition in the industry, in order to meet the needs of the market, we continue to increase investment in the development of new products. Since the second half of 2011, our company began to develop Outlast modified viscose fiber produced by DuPont of the United States (hereinafter referred to as Outlast fiber) variety. Outlast fiber contains hollow microcapsule thermal phase change material, which is a new type of intelligent fiber with temperature regulation function. Through the joint efforts of the company's R&D center and the test workshop, we focus on improving the spinnability of the fiber and controlling the quality of the product, paying special attention to reducing the damage to the microcapsules, and finally developing the Outlast fiber according to the quality requirements of the end users. / combed cotton 60/409.7tex yarn, the quality of the yarn meets the requirements of use. The development process of the product is now introduced.

1 Material properties Due to the hollow characteristics of Outlast fiber, the fiber is coarser, the fineness is 1.7dtex, the actual length of fiber is 40mm, the breaking strength is 19.8cN/tex, and the moisture regain is 11.0%. Xinjiang 137 long-staple cotton is used, and the micronaire value is 3.7-4.0. The breaking strength is about 36cN/tex and the moisture regain is 7.2%. 2The raw spinning and pretreatment of the raw material Outlast fiber is a new type of temperature-regulating fiber. Because our company chooses the fiber for the first time to develop new products, its suitable spinning performance. Lack of awareness. We found through a small amount of trial spinning that due to the coarser fiber, the surface is almost free of curl, and the cohesion between the fibers is poor, and the cleaning process cannot be rolled into a normal shape. After the auxiliary measures were taken, although it was possible to roll into a roll, the production of the card was also severe due to the serious fall of the cotton net. Therefore, we use a variety of schemes for trial spinning. By comparing the spinnability and the sliver quality index, we finally determine the production plan from the perspective of ensuring normal production, stable quality, and ensuring the ratio: 1.5% anti-slip agent and 1.5 The mixture of % water is sprayed with Outlast fiber, and the bag is equilibrated for 24 hours; the Outlast fiber and the combed sliver are loaded into the disc at a ratio of 80:20 for mixing production, and then in the drawing process according to Outlast fiber and combed cotton 60 The ratio of 40 is required to be mixed.

YQ-00C type foreign fiber + A076F type winding machine 3 production process flow In the selection of production process, we focus on the following factors: Outlast fiber is thicker, less curl, poor cohesion, low strength, can not Excessive impact, poor fiber fluffiness, air flow is not easy to convey; in order to ensure the strength of the yarn, the selected long-staple cotton fiber is required to be finer, and the impact is reduced to avoid fiber damage; because the yarn number is fine, the output is low, and high-speed and high-yield are not required. Based on the above considerations, we did not choose the cleaning and carding process, but used the traditional domestic cleaning and carding process. The specific process flow is as follows.

Opener-FA106 type opener-sorting machine-SFA161 type cotton box-A186D type carding machine-FA306 type draw frame machine-A191B type roll machine-4201C type comber cotton picker type 4006B type blending machine Machine A036C type cotton opener 4092A type cotton box one A076E type coiling machine one, A186D type carding machine (combed cotton strip) (Outlast fiber combed cotton mixed strip) type draw frame (two) FA458 type roving machine EM128K type spinning machine - No21C type winder 4 main technical measures Long-staple cotton combing strip can be produced by conventional process, no longer elaborate, the following describes the production technology for Outlast fiber.

4.1 Cleaning cotton sliver, in order to ensure the ratio, normal grab, we designed a simple strip torn device. The combed strips are pulled into strips of about 20 cm, and the quality is controlled into a package, and the Outlast fiber raw materials which are packaged after spraying the anti-slip agent are uniformly discharged into the disc in proportion, and the top of the bale is leveled. The operation rate of the control baggage machine is controlled at about 90%, so that the two fibers can be evenly mixed by “diligently grasping, less grasping, and finely grasping”. In order to improve the tightness of the lap structure, four rovings are placed at intervals between the rollers of the winder to ensure a good structure when the lap is unwound.

4.2 Carding process The main focus of the carding process control is to be able to produce normally, and secondly to reduce fiber damage. Because the length of the Outlast fiber is longer than that of the conventional viscose fiber, after trial and optimization, we will raise the cotton pad by 5mm to increase the length of the carding surface and reduce fiber damage.

At the same time, the small leaking bottom process is adjusted to correct the increase of the cotton loss caused by the shortening of the holding surface. The licker speed was reduced from 870 r/min to 820 rpm to reduce the damage of the licker to the fiber. Due to the poor cohesion of Outlast fiber, although pre-spinning pretreatment and a certain proportion of combed sliver blending improved the spinnability, the netting phenomenon still occurred in production. To this end, we tried to use the AD4030RX02090P type with grooved doffer clothing, which significantly improved the phenomenon of carding and netting, so that the card production was normal.

4.3 The drawing process takes into account the poor cohesion of Outlast fiber. We control the blending ratio of combed cotton to ensure the blending ratio of the two blended fibers, and use two mixing to ensure that the corresponding mixing effect is achieved without Will make the cooked strips too bad. The length and uniformity of the two fibers are considered to be good in the process. In order to reduce the damage to the microcapsules, the pressure of the rubber roller is appropriately reduced. The center distance of the roller is 3 mm larger than that of the conventional viscose, and the quantitative amount of the cooked bar is increased by 2 g/ 5m, which is 18.5g/5m, is beneficial for improving the fiber cohesion.

4.4 The roving process The roving process should also consider not only ensuring normal drafting, but also reducing the damage of the cradle pressure on the microcapsules. The center distance of the front zone roller is increased by 2 mm, and the center distance of the middle and rear zone roller is increased by 3 mm. The cradle pressure is in the original Reduce the first gear based on the basis. Due to poor fiber cohesion, the roving twist coefficient is increased to 90-95 to prevent accidental elongation after unwinding. The roving is 4.5g/10m. The spindle speed should not exceed 4.5. The fine yarn process is performed on conventional viscose spinning. On the basis of the process, the distance between the center of the front area is increased by 2mm, and the distance between the center of the rear area is increased by 4mm, which reduces the pressure of the pneumatic cradle, so that the pressure of the front roller of the measured double spindle is reduced from 157N~167N to 137N~147N. The gauze is dry and the production machine is equipped with imported INARCO Shor A63 rubber roller. Due to the poor cohesion of Outlast fiber, in order to effectively reduce the breakage and stabilize the yarn hairiness, a high-precision bearing steel collar with a diameter of 38mm and a "Golden Cat" brand sapphire wire ring are selected. The speed of the spinning spindle should be around 14500r/min, and the number of broken ends when measuring thousands of spindles should not exceed 12. The main yarn quality indicators: weight CV1.5%, strip CV14.2%, strip CVb2.5%, detail 8 / km, thick section 26 / km, neps 67 / km, average strength 146cN, The single strong CV is 10.2%, the twist is 135捻/10cm, and the hairiness index is about H4.1. Its yarn quality has reached the requirements of users.

4.6 Winding process due to the poor cohesion of the Outlast fiber, plus the speed of the air jet loom is higher, the warping of the 100 million metre is required to be less than 0.7, so the twist coefficient of the yarn is designed to 420. Guaranteed yarn splicing strength is the focus of winding production control. According to the splicing characteristics of the N21C winder, after repeated trials, we rotate the splicer's untwisting pipe counterclockwise by 5, while appropriately increasing the splicing length. Ln3 is adjusted by the conventional Ln4, and the twisting time is 0.12S. Increased to 0.14s. After the process adjustment, the splicing joints are closely and evenly spliced, and the splicing strength meets the requirements for use. The winding speed is reduced to 800m/min, and the winding tension is designed to be 60cN. Try to keep the original yarn strong. Because the final product needs to be brushed, the yarn clearing parameter design is loosely controlled under the premise of satisfying the user's requirements, minimizing cutting and reducing the number of knots.

5 Conclusion Because Outlast fiber has fineness, smooth surface, poor spinnability, and high raw material price, and users have high requirements on product quality and production rate. Therefore, pre-treatment of raw materials should be done before production. The process implements the principle of lighter and lesser, and special attention should be paid to the reduction of microcapsules in the process design. The steel ring traveler configuration is preferred, and the speed and temperature and humidity of each process are controlled to ensure smooth production and strengthen operation management. Reduce the production of various types of back flowers, increase the production rate, and ensure the blending ratio. The winding process focuses on adjusting the parameters of the splicing to improve the strength of the splicing.