Development of Outlast Modified Viscose Blended Yarn

Development of Outlast Modified Viscose Blended Yarn Jiang Yuedong Cao Dejin (Jiangsu Taida Textile Co., Ltd.) pretreatment, reasonable selection of production process, optimization of various process parameters, targeted selection of relevant equipment, winding process focus The splicing parameters were adjusted to ensure the quality of splicing. Outlast modified viscose/combed cotton 60/40 9.7tex yarns were successfully spun. 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, and constantly increase the 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 (hereinafter referred to as Outlast fiber) varieties. Outlast fiber contains hollow microcapsule thermosensitive phase change material, which is a new intelligent fiber with temperature regulation. Through the joint efforts of the company's R&D center and the test shop, we focused on improving the fiber's suitability for spinning and controlling the quality of the product, while paying particular attention to reducing the damage to the microcapsules, and finally developing the Outlast fiber according to the end user's quality requirements. / Combed cotton 60/409.7tex yarn, the yarn quality meets the use requirements. The development process of this product is introduced.

1 Raw material properties Due to the hollow nature of Outlast fiber, the fiber is coarse, the fineness is 1.7dtex, the actual fiber length is 40mm, the breaking strength is 19.8cN/tex, the moisture regain is 11.0%. Xinjiang 137 cotton is used, and the micronaire value is 3.7 ~ 4.0 , The fracture specific strength is about 36cN/tex, and the moisture regain is 7.2%. 2 Test Spinning and Pretreatment of Raw Materials Outlast fiber is a new kind of temperature-regulating fiber. Since our company chose this fiber for the first time to develop new products, it is suitable for spinning. Lack of understanding. We found that after a small amount of test spinning, because the fiber is thick and the surface is basically free of curls, the cohesion between the fibers is poor, and the cleaning process cannot be normally rolled. After taking supplementary measures, although it can be rolled, the production of the card is also due to the serious fall of the cotton net and it cannot be delivered. Therefore, we use a variety of programs for trial spinning, by comparing the appropriate spinning properties and sliver quality indicators, and ultimately from the perspective of ensuring normal production, stable quality, and ensuring the ratio of the preferred production plan: first with 1.5% anti-slip agent and 1.5 The % water mixture was sprayed with Outlast fibers and baled after 24 h; the Outlast fibers and combed slivers were loaded into a disc at a ratio of 80:20 for blending, and the drawworks were based on Outlast fibers and combed cotton 60. : 40 ratios require mixing.

YQ-00C foreign fiber + A076F winder 3 production process flow In the selection of the production process, we focused on the following factors: Outlast fiber is coarse, less curl, poor cohesion, low strength, can not Excessive blow, poor fiber bulkiness, airflow is not easy to transport; to ensure that the yarn strength, the fineness of selected long-staple cotton fiber finer, reduce the impact to avoid fiber damage; due to fine yarn number, low output, without high-speed and high-yield. Based on the above considerations, we did not choose the carding and jointing process but instead used the domestic traditional cotton and carding processes. The specific process flow is as follows.

Opener - FA106 Opener - Sorter - SFA161 - Cotton Case - A186D Carding Machine - FA306 Draw Frame - A191B - Roller Machine - 4201C - Comber Picking Machine - 4006B Blender Machine A036C type opener 4092A type feeding box A076E type coiling machine A. A186D type carding machine (combed sliver) (Outlast fiber combed cotton mixed type) type drawing machine (two) one FA458 Roving Machine EM128K Spinning Machine No21C Winding Machine 4 Main technical measures for each process The long-staple cotton comb sliver can be produced by the conventional process and will not be elaborated. The following describes the production technology for the Outlast fiber.

4.1 Cotton wool sliver, in order to ensure the ratio of normal sliver, we designed a simple sliver tearing device. The combed strips were torn into strips of about 20 cm, and the quality of the package was controlled. After the anti-slip agent was sprayed, the Outlast fiber raw materials were evenly distributed into the discs in proportion to do a good job of smoothing the top of the bales. Control the operation rate of the bale catcher at about 90%, so that "difficulty catching, less catching, fine gripping" makes the two fibers evenly mixed. In order to improve the compactness of the lap structure, 4 rovings are placed at intervals between the rollers of the winder to ensure the structure of the lap is unwinding.

4.2 Carding process The key to 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 the test is preferred, we will increase the length of the combing surface by 5mm to increase the length of the combing surface and reduce fiber damage.

At the same time, adjust the small leaking bottom process and correct the increase in noil after the shortening of the holding surface. The licker-in speed was reduced from 870 r/min to 820 r/min to reduce the damage of the licker-in fiber. Due to the poor cohesion of the Outlast fiber, although the pre-spinning pretreatment and the blended sliver blending at a certain ratio improved the suitable spinning performance, the phenomenon of netting still occurred during production. For this reason, we tried to use the AD4030RX02090P type doffering with a groove. The result was a significant improvement in the phenomenon of carding and net carding.

4.3 Paralleling Process Taking into account the poor cohesion of the Outlast fiber, we control the blending ratio of the two blended fibers by controlling the pre-running of the combed cotton, and use two blends to ensure that the corresponding blending effect is achieved. Causes the slivers to rot. The length and uniformity of the two fibers are considered in the process. In order to reduce the damage to the microcapsules and reduce the pressure of the rubber roller, the center distance of the roller is 3mm larger than that of the conventional viscose, and the mass of the cooked bar is increased by 2g/ 5m, namely 18.5g/5m, is beneficial to increase the cohesion of the fiber.

4.4 Roving process The roving process also needs to consider not only guaranteeing normal drafting, but also reducing the damage of the cradle to the microcapsules. The distance between the center of the front roller is increased by 2mm, and the center distance of the center and back roller is increased by 3mm. The cradle pressure is in the original Base on a lower gear. Due to poor cohesion of fibers, the roving twist coefficient is increased to 90 ~ 95 to prevent unintentional elongation of the unwinding at the back side. The amount of roving is 4.5g/10m, and the spindle speed should not exceed 4.5. Spinning Process Spun Yarn Process in Conventional Viscose Fiber Spinning Based on the process, the distance between the center of the front roller is increased by 2mm, the distance between the roller center of the rear zone is increased by 4mm, and the pneumatic cradle pressure is reduced, so that the measured front roller pressure of the double spindle is reduced from 157N~167N spindles to 137N~147N. The sliver is dry and all the production machines are equipped with imported INARCO Shore A63-degree rubber rollers. Due to the poor cohesion of the Outlast fiber, in order to effectively reduce the breakage and stabilize the yarn hairiness, the high-precision bearing steel ring with a diameter of 38mm and the “Gold Cat” brand sapphire ring were selected. The spinning spindle speed should be around 14500 r/min, and the broken spindle should not exceed 12 spindles when measured. Main yarn quality indicators: weight CV 1.5%, dry CV 14.2%, dry CVb 2.5%, detail 8/km, thick section 26/km, neps 67/km, average strength 146 cN, The single strong CV is 10.2%, the degree of twist is 135 捻/10cm, and the hairiness index is about H4.1. Its yarn quality meets the requirements of users.

4.6 winding process due to Outlast fiber cohesion is poor, combined with the high speed of the air-jet loom, warping hundred thousand meters breakage requirements less than 0.7, so the yarn twist coefficient is designed to 420. Adjust the connection parameters to Guaranteeing the splicing strength of the yarn is the focus of winding control. According to the splicing feature of the N21C winder, after repeated tests, we reversed the splicer's anti-twist tube by 5 in the counterclockwise direction, while increasing the splicing length appropriately. The Ln4 was adjusted by the conventional Ln4, and the twisting time was 0.12S. After the process was adjusted to 0.14s, the appearance of the splicing knot was close and uniform, and the splicing strength reached the use requirement. The winding speed was reduced to 800m/min, and the tension of the winder was designed to be 60cN. The original yarn strength was kept as much as possible. Because the final product needs to be brushed, the yarn clearing parameters are designed to meet the user's requirements and the looseness is mastered. Cutting is minimized and the number of knots is reduced.

5 Conclusion Due to Outlast's fine fiber thickness, smooth surface, poor spinning properties, coupled with high raw material prices, and users of high product quality and production rate requirements, so the production of raw materials before the pre-processing, cleaning The process shall implement the principle of tapping and falling, and the process design shall pay special attention to reducing the damage to the microcapsules. The configuration of the ring collar is preferred, and the speed and temperature and humidity of each process are well controlled to ensure the smooth progress of production, and the operation management is strengthened. Reduce the production of various types of flowers, improve the rate of production, and ensure the blending ratio. The winding process focuses on adjusting the splicing parameters to improve the splicing strength.