喷气纺纱机上第二喷嘴的结构参数对纱线强力的影响

喷气纺纱机中第二喷嘴的结构参数主要包括喷嘴长度、喷嘴内径、喷射孔角度、喷射孔数目、喷射孔直径和吸人口内径等参数。文章分析讨论了第二喷嘴各结构参数对喷气纱强力的影响，并通过实验找出了最优的结构参数。     

喷气纺喷孔位置的优化

喷气纺纱机的两喷嘴喷射孔位置是影响纱线强力的主要结构参数。利用通用旋转组合设计的方法研究了喷气纺纱机上两个喷嘴喷射孔的位置与喷气纱强力的关系，建立了优化数学模型，并给出了优化后的参数。     

双喷嘴喷气纺纱机上两个喷嘴喷射孔位置的优化

双喷嘴喷气纺纱机上两个喷嘴喷射孔位置是影响纱线强力的主要参数。为了进一步提高喷气纱强力,主要利用了通用旋转组合设计方法研究喷气纺纱机上两个喷嘴喷射孔的打孔位置与喷气纱强力的关系,建立了优化数学模型,并给出了优化后的参数。     

喷气纺第二喷嘴结构参数的研究

喷气纺第二喷嘴的结构参数主要包括喷嘴长度、喷嘴内径、喷孔角度、喷孔数目、喷孔直径和吸入口内径等,分析讨论了各参数与成纱强力的关系,并通过实验找出了较优的参数。     

喷气纺纱喷嘴结构参数的计算机辅助优化设计

本分析了喷气纺纱喷嘴主要结构参数，喷孔直径和喷孔角度对喷气纱质量的影响，并通过二次回归正交试验设计及多因子的计算机辅助设计，得出了提高喷气纱质量的最佳参数配合。     

喷气纺纱喷嘴对纱线强力影响的研究和探讨

喷气纺纱是继转杯纺纱(气流纺纱)、自捻纺纱、涡流纺纱之后发展起来的一种新型纺纱方法。它利用高速旋转气流来推动须条形成高速旋转的气圈运动，经固定喷嘴加捻成纱的。但是，喷气纱强力较低一直是喷气纺纱进一步发展的瓶颈。本文探讨了喷气纺纱喷嘴的主要结构参数对喷气纱强力的影响,并通过大量试验和科学计算优化出较理想的喷嘴结构参数，使纺出的涤棉混纺纱达到同类环锭纱强力的90％以上。     

喷气纺纱喷嘴对纱线强力影响的研究和探讨

喷气纺纱是继转杯纺纱(气流纺纱)、自捻纺纱、涡流纺纱之后发展起来的一种新型纺纱方法。它利用高速旋转气流来推动须条形成高速旋转的气圈运动，经固定喷嘴加捻成纱的。但是，喷气纱强力较低一直是喷气纺纱进一步发展的瓶颈。本文探讨了喷气纺纱喷嘴的主要结构参数对喷气纱强力的影响，并通过大量试验和科学计算优化出较理想的喷嘴结构参数，使纺出的涤棉混纺纱达到同类环锭纱强力的90％以上。     

浅谈主要工艺参数对喷气纱强力的影响

主要阐述了纺纱速度、前罗拉钳口与第一喷嘴隔距、纺纱气压三大工艺参数对喷气纱强力的影响,通过实验确定最优的参数.     

喷气纺纱喷嘴气压的工艺研究

为提高喷气纺纱的强力,分析探讨了喷嘴气压对成纱结构和性能的影响,选取第一喷嘴气压和第二喷嘴气压分别进行单因子五水平试验,运用直观分析法分析喷嘴气压及其差值对成纱性能的影响.试验结果表明:两个喷嘴气压差值较大时对纱线的强力、伸长和毛羽有显著影响,对纱线的条干、粗细节影响不明显.在以强度为主要参考指标时,较理想工艺为第一喷嘴气压0.35 MPa,第二喷嘴气压0.43 MPa.     

喷气织机喷嘴及喷射气流特性研究

通过分析喷气织机单喷嘴喷射引纬中喷射气流动力特性及飞行状态,指出其对成纱的不利因素,同时与安装辅助喷嘴的喷射引纬进行对比,并对控制提高成纱质量提出要求。     

喷气涡流纺涡流管喷孔工艺的实验研究

喷气涡流纺是利用高速旋转气流在涡流管中对纤维加捻而使其成纱,为了研究涡流管喷孔参数对纺纱的影响,对涡流管的喷孔参数(喷孔孔径、喷孔角度和喷孔个数)进行探讨,选择2种喷孔直径(0.5、0.6 mm),并在这2种直径下选择7种喷孔角度(30.0°、32.5°、35.0°、37.5°、40.0°、45.0°、50.0°)、3种喷孔个数(4、5、6),以粘胶为原料在喷气涡流纺纱小样机上进行纺纱实验,结果表明:当喷孔角度为45.0°,喷孔直径为0.5 mm,喷孔数目为4时,成纱质量好且能耗小.     

Effect of the distance between jet orifice and nozzle Alex on properties of vortex spun yarn

This study focuses on the effect of various distances between the jet orifice and the nozzle Alex on the properties of the vortex spun yarn. Four levels of the distance are designed within certain range. Building three-dimensional computational fluid dynamics models, we use the method of numerical simulation to calculate the inner fluid field of nozzle. The results showed that the distance typically affected the airflow movements, particularly in tangential velocity, and the smaller d is beneficial to diffuse the airflow uniformly and to improve the quality of vortex spun yarn. The corresponding experiments have been carried out. In this paper, 100% viscose drawing slivers are spun into vortex spun yarn, and their physical properties are tested. Spinning experiment results prove that when the distance is minimum under the condition of avoiding the high-speed airflow shooting out from the jet orifices colliding with the cone body, the yarn strength reaches the maximum value, while the unevenness of breaking strength meets the minimum, and the other yarn properties are superior, which shows a good agreement with the simulation results.     

喷气涡流纺喷嘴喷孔参数的分析

喷气涡流纺是利用喷嘴内高速气流的旋转对纤维加捻成纱的设备,为了分析喷嘴的结构参数对成纱质量的影响,选择喷嘴的喷孔直径d为0.5 mm,分别在不同喷孔数量n(5,6)及不同喷孔角度θ(60°,65°,70°,75°,80°)下,在新型涡流纺纱机上对粘胶原料进行纺纱实验。实验结果得到了喷孔最优结构参数:喷孔孔径×数量φ0.5×5;喷孔角度70°。     

解析法评价旋转气流对喷气涡流纱的加捻强度

在对喷嘴内部流场数值模拟的基础上通过解析法研究旋转气流对喷气涡流纱加捻的强度。研究结果表明:旋转气流对喷气涡流纱的加捻强度是喷孔数目、喷孔倾角、喷孔直径、喷嘴直径、空心锭外径、喷孔出口速度(即喷嘴气压)、空心锭入口与喷嘴入口间距、尾端自由端纤维倒伏空心锭上部的高度、纱线直径等的函数。喷孔出口速度增加,旋转气流加捻强度增强;加捻喷嘴直径减小,旋转气流加捻强度增大;空心锭入口与喷嘴入口间距增加,旋转气流加捻强度减小;空心锭外径增加,旋转气流加捻强度增加。数值计算结果表明解析模型的有效性。     

喷气涡流纺成纱工艺对竹浆纤维色纺纱性能的影响

为进一步拓展喷气涡流纺织品种及提高传统色纺纱加工效率,利用Box-Behnken设计实验方案,借助软件Minitab 16,分析喷气涡流纺工艺参数对竹浆纤维色纺纱性能的影响。结果表明：成纱工艺对色纺纱断裂强度的影响较为复杂,其中纺纱速度及纱线线密度对色纺纱断裂强度的影响受喷嘴气压不同取值影响;色纺纱条干不匀主要受纺纱速度和纱线密度影响,提高纺纱速度使纱线条干不匀先减后增,而减小纱线线密度将显著恶化色纺纱条干;色纺纱毛羽主要受喷嘴气压和纺纱速度影响,降低喷嘴气压及提高纺纱速度均会使纱线毛羽增加;色纺纱直径主要受喷嘴气压和纺纱线密度影响,增加喷嘴气压或减小纱线线密度,均会使色纺纱直径明显减小。     

The effect of air-jet nozzle structural parameters on new cotton rotor-jet spun yarn properties

In this paper, a hybrid spinning system the so-called “rotor-jet spinning method” which utilizes the air-jet nozzle in rotor spinning process is presented. Thus, air-jet nozzles with different structures of 90S, 90Z, 60Z, and 30Z (the values of 90, 60, and 30 are orifice angles and S and Z are air rotational directions) were designed and constructed and then mounted between the take-up nozzle position and doffing tube in a rotor spinning machine. The air-jet pressure was changed at 0.2, 0.5, 0.8, 1, 1.2 and 1.5 bar values. The physical properties of cotton rotor-jet spun yarns with yarn count 20 Tex and nominal yarn twist of 938 TPM were investigated and compared with that of normal rotor-spun yarn. The experimental results indicated that by utilizing a 90Z air-jet nozzle at 1 bar air pressure, the highest yarn tensile strength, abrasion resistance, and twist, and lowest elongation are obtained compared with those of normal rotor as well as rotor-jet spun yarns with 30Z, 60Z, and 90S air-jet nozzle types. However, the rotor-jet spun yarn irregularity produced with 90Z air-jet nozzle is almost identical to normal rotor-spun yarn. It is also shown that the rotor-jet spun yarn hairiness properties which were produced with a 90Z air-jet nozzle at air pressure values of 0.2, 0.5 and 1 bar is almost similar to normal rotor-spun yarn while the lowest yarn hairiness is achieved at air pressure value of 0.8 bar. The experimental results of this paper suggest that the newly developed rotor-jet spun yarn is superior to normal rotor-spun yarn from the point of view of yarn tensile, abrasion resistance, twist, and partially hairiness properties.

     

A numerical and experimental study on the effect of the orifice angle of vortex tube in vortex spinning machine

In order to study the effect of orifice angle of vortex tube on yarn forming in jet vortex spinning, eight levels of nozzle angle are designed, from 40° to 65°, and the corresponding three-dimensional computational fluid dynamics (CFD) models are established to conduct the numerical simulation of the airflow in the nozzle. Through the analysis of numerical simulation, the pressure and velocity distribution are made clear which provides reference for the future design of the vortex tube. Simulation results show that when the orifice angle is around 50°, the airflow state within the nozzle has a large negative pressure with appropriate axial and tangential velocity, which is conducive to the formation of the open ends of fibers and twisting, and the yarn quality is better. Spinning experiment results prove that single yarn strength is the maximum, the irregularity of single yarn strength is the minimum, and other yarn properties are superior with the orifice angle at 50°, which shows a good agreement with the simulation results.     

工艺参数对喷气纱强力的影响

阐述了纺纱速度、前罗拉钳口与第一喷嘴隔距、纺纱气压三大工艺参数对喷气纱强力的影响 ,并通过实验找出了最优的参数。