利用喷嘴减少苎麻纱毛羽的探讨

本文从喷嘴在纺纱中的几个实例出发，根据它们产品毛羽少的共性，在苎麻纺纱实验中采用了喷嘴与环锭纺的方法，以期减少苎麻环锭纱的毛羽。     

利用喷嘴在络筒机上减少苎麻纱毛羽的研究

本文将喷嘴与络筒机相结合,对喷嘴减少苎麻纱的毛羽进行了实验研究,并研究了参数对减少毛羽的影响,实验结果表明了喷嘴中高速旋转气流对减少苎麻纱毛羽的有效性.     

苎麻／涤Sirofil纱的性能研究

对苎麻/涤Sirofil纱的性能进行了研究，并与苎麻环锭纱、Siro纱、包芯纱、plyfil纱进行了比较。结果显示，苎麻/涤Sirofil纱的性能要优于对照纱。     

苎麻/涤Sirofil纱的性能研究

对苎麻/涤Sirofil纱的性能进行了研究,并与苎麻环锭纱、Siro纱、包芯纱、plyfil纱进行了比较.结果显示,苎麻/涤Sirofil纱的性能要优于对比纱.     

苎麻/壳聚糖抗菌纱喷气纺研究

对苎麻/壳聚糖(55/45) 抗菌纱,采用喷气纺纺制的可行性进行了探讨,结果表明通过对喷嘴的设计,选取优化后的工艺参数,同时,喷气纱具有较佳的纱线结构及良好的抗菌性.     

苎麻织物毛羽刺痒感的力学评价

织物表面硬质毛羽是导致皮肤刺痒的主要因素，本文依据毛羽与皮肤的刺扎作用，建立单纤维轴向弯曲压缩基本模型，并利用改装后的单纤维强力仪，对苎麻纤维刷进行刺扎弯曲实验，验证了纤维束最大压缩强力与纤维形态参数间的基本关系。     

苎麻／壳聚糖抗菌纱喷气纺研究

对苎麻/壳聚糖(55/45)抗菌纱,采用喷气纺纺制的可行性进行了探讨,结果表明:通过对喷嘴的设计,选取优化后的工艺参数,同时,喷气纱具有较佳的纱线结构及良好的抗菌性。     

利用新原料和新技术开发麻类（苎麻）新面料

本文对于充分利用目前发展的化纤原料以及新型的纺纱技术和设备,纺制出能克服麻类产品的固有缺陷的混纺纱、复合纱,开发新型麻类面料作了探讨。     

紧密纺技术在苎麻纺纱中的应用探讨

本文主要探讨紧密纺技术在苎麻纺纱领域中的应用.通过对影响苎麻紧密纺工艺参数的试验研究,以纱线毛羽、断裂强度、乌斯特条干CV值等为考核指标,优选苎麻紧密纺纱工艺.试验结果表明:将紧密纺技术应用于苎麻纺纱中,能较好减少苎麻纱毛羽,提高断裂强度,改善乌斯特条干等纱线品质指标.     

苎麻织物毛羽刺痒感的力学评价

织物表面硬质毛羽是导致皮肤刺痒的主要因素,本文依据毛羽与皮肤的刺扎作用,建立单纤维轴向弯曲压缩基本模型,并利用改装后的单纤维强力仪,对苎麻纤维刷进行刺扎弯曲实验,验证了纤维束最大压缩强力与纤维形态参数间的基本关系.     

Studies on reduction of yarn hairiness by nozzles in ring spinning and winding by airflow simulation

Reduction of yarn hairiness by nozzles in ring spinning and winding is a new approach. Simulation of the airflow pattern inside the nozzles provides useful information about actual mechanism of hairiness reduction. The swirling air current inside the nozzles is capable of wrapping the protruding hairs around the yarn body, thereby reducing yarn hairiness. Since production rate of winding is very high and the process itself increases yarn hairiness any method to reduce the hairiness of yarns at this stage is a novel approach. A CFD (computational fluid dynamics) model has been developed to simulate the airflow pattern inside the nozzles using Fluent 6.1 software. In this study, both S- and Z-type nozzles having an axial angle of 50° and diameter of 2.2 mm were used for simulation studies. To create a swirling effect, four air holes of 0.4 mm diameter are made tangential to the inner walls of the nozzles. S- and Z-twisted yarns of 30 tex were spun with and without nozzles and were tested for hairiness, tensile and evenness properties. The total number of hairs equal to or exceeding 3 mm (i.e. the S3 values) for yarn spun with nozzle is nearly 49–51 % less than that of ring yarns in case of nozzle-ring spinning, and 15 % less in case of nozzle-winding, while both the yarn types show little difference in evenness and tensile properties. Upward airflow gives best results in terms of hairiness reduction for nozzle-ring and nozzle wound yarns compared to ring yarns. Yarn passing through the centre of the nozzle shows maximum reduction in S3 values.     

Reducing ring spun yarn hairiness via spinning with a contact surface

In this study, spinning with a contact surface was introduced as a simple and energy-saving method to reduce spun yarn hairiness. Theoretical analysis indicated that yarn hairiness could be reduced via a sufficient long contact surface applied in other part of yarn formation zone in addition to spinning triangle. Then, a simple contact apparatus was installed on ring frame to validate the theoretical analysis. Results proved that yarn hairiness was reduced via a contact surface in the yarn formation zone. However, unevenness was deteriorated for most yarns spun with contact apparatus during the spinning, which might be due to fiber mass concentration. Most of yarns spun with contact apparatus had a lower strength than the conventional yarns. This might be because evenness deterioration to decrease yarn strength overpowered hairiness reduction to increase yarn strength for most yarns spun with a contact surface.     

A novel method to reduce hairiness level of ring spun yarn

The quality of ring spun yarns is largely determined by its level of hairiness. The existence of hairiness inevitably affects the quality of ring spun yarns. This paper presents an innovative method on lowering the level of hairiness of ring spun yarns. This can be achieved by shooting compressed air to the yarn, through a swirl nozzle comprising a yarn duct and an airjet nozzle attached to a traditional ring spin frame. When compressed air is applied from the air-jet nozzle to the yarn duct, the swirling air flow tucks surface fibers of the ring spun yarns into its body. Four controllable variable parameters for the process, supplied pressure, nozzle position, twist factor and spindle speed, and their effects on the lowering of yarn hairiness will be clarified. Their impact on the quality of the yarn is statistically analyzed, and the optimum outcome of the combination of parameters for the process, will thus be determined.     

Multiple response optimization of rotor yarn for strength,unevenness, hairiness and imperfections

In this study, a multiple response optimization model based on response surface methodology was developed to determine the best rotor speed and yarn twist level for optimum rotor yarn strength and unevenness, and minimum yarn hairiness and imperfections. Cotton yarn of 30 tex, was produced on rotor spinning machine with different twist levels (i.e. 500, 550, 600 and 700 tpm) at different rotor speeds (i.e. 70000, 80000, 90000 and 100000 rpm). Yarn quality characteristics were determined for all the experiments. Based on the results, multiple response optimization model was developed using response surface regression on MINITAB® 16 statistical tool. Optimization results indicate that with the quality of raw material selected for this study, top 50 % quality level, according to USTER® yarn quality benchmarks, can be achieved with 100 % desirability satisfaction for all the selected yarn quality parameters at rotor speed of 77,800 rpm and yarn twist of 700 twists per meter.     

Property of ramie fiber degummed with Fenton reagent

This paper investigated the performance and morphology of ramie fibers degummed using Fenton reagent. In order to deeply understand the reaction characteristics, SEM, XRD and FT-IR were employed to characterize the morphologies, chemical components and crystallinity of degummed fibers. Also, the physical and mechanical properties such as tenacity, breaking elongation, density, softness and degree of polymerization of degummed fibers were measured. The experimental results indicated that Fenton can serve as an effective oxidation degumming agent under weak acid condition. The new degumming method could remove more gummy components from raw ramie, whereas the cellulose content in treated fibers was further increased compared with the alkaline oxidation degumming. The fibers degummed using Fenton showed slight increase in tenacity and significant increase in density as well as breaking elongation comparing with alkaline oxidation degumming. The degummed fibers were also characterized in terms of SEM, XRD and FTIR which confirmed the effectiveness of the new degumming method.     

苎麻生物脱胶研究进展

脱胶是苎麻加工中基础而又关键的工序，脱胶的效果直接影响精干麻品质和制成率。本文就不同基因型苎麻中胶质的含量及动态变化、生物脱胶的原理及应用进行了概述。     

Yarn setting and hairiness reduction with a steam jet during winding

This paper examines the use of pressurized steam for wrapping and setting the yarn hairs concurrently via a new steam-jet process during winding. Yarn torque can also be stabilized as an added advantage. The results obtained with two batches of pure wool yarns suggest that there is potential to achieve yarn hairiness reduction of up to 60 % with minimum deterioration in hairiness even after subsequent rewinding.     

Impact of yarn extension on packing density of ring spun yarn

The present paper deals with a detailed study on the effect of progressive yarn extension on diameter, overall packing fraction, radial packing fraction at different radial positions and partial packing fraction at different segments along the length of a fibre. An image processing based system to characterize and visualize the configuration of fibers in yarn in extended mode has been adopted. It has been observed that with the increase of yarn extension at different intervals, yarn diameter continuously decreases but at different yarn extension intervals, the percentage decrease value in the yarn diameter is different. But the packing density of yarn does not follow the exact trend of yarn diameter with the extension of yarn at different intervals. The yarn packing density initially increases at very high rate, then at very low rate and finally the packing density of yarn rather slightly decreases with the increase in yarn extension. The radial packing density of the yarn is not uniform across the cross-section of the yarn and it is not maximum near the yarn axis, rather it is maximum at some distance from the yarn axis. The location of maximum radial packing densities of yarn changes with the yarn extension. The partial packing density along the length of yarn is not uniform and the results are equally applicable for all level of yarn extension.