Theoretical study of the effects of the shape of the spinning triangle

2020 ◽  
pp. 004051752093846
Author(s):  
Ruiqi Shao ◽  
Longdi Cheng ◽  
Wenliang Xue ◽  
Yanping Yu ◽  
Ning Pan
Keyword(s):  
Theoretical Study ◽  
Twist Angle ◽  
Initial Condition ◽  
Deviation Angle ◽  
Initial Height ◽  
Yarn Twist ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Independent Parameters ◽  
Force Equilibrium

The spinning triangle is an important area in the spinning process, and the shape of the spinning triangle influences the yarn qualities. This paper aims to theoretically study the effects of the spinning parameters on the shape of the spinning triangle. In this paper, a model of the spinning triangle considering force equilibrium and torque equilibrium was built. The initial strain of fibers in the spinning triangle was determined by the profile of the spinning triangle. The initial height of the spinning triangle was obtained by the width of the spinning triangle and the twist angle. Based on the initial condition and boundary condition in the model, the displacements of the twisting point were obtained. With the displacements of the twisting point, the height of the spinning triangle and the deviation angle of the center fiber in the final spinning triangle, which represent the shape of the spinning triangle, were calculated. In the analysis, the spinning tension, yarn twist, and yarn radius were chosen as the independent parameters to analyze the geometric change of the spinning triangle.

scholarly journals Theoretical Study of Effect of Ring Spinning Triangle Division on Fiber Tension Distribution

2015 ◽  
Vol 10 (3) ◽  
pp. 155892501501000
Author(s):  
Xinjin Liu ◽  
Xuzhong Su
Keyword(s):  
Theoretical Study ◽  
Theoretical Models ◽  
Ring Spinning ◽  
Minimum Potential Energy ◽  
Tension Distribution ◽  
Fiber Tension ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Minimum Potential

The spinning triangle is a critical region in the spinning process of staple yarn. Its geometry influences the distribution of fiber tension at spinning triangle directly and affects the qualities of spun yarns. Taking appropriate measures to change the ring spinning triangle geometry and improve the qualities of yarn has attracted more and more interest recently. Spinning triangle division is one of the most effective measures, such as solospun technology. Therefore, in this paper, the effect of ring spinning triangle division on fiber tension distribution was studied theoretically. The general case that the spinning triangle is divided into two parts, primary triangle and final triangle, was investigated. Firstly, theoretical models of the fiber tension distributions in the final and primary spinning triangles are given respectively using the principle of minimum potential energy. Secondly, the fiber tension distributions in the spinning triangle with different shape parameters are numerically simulated. Finally, the possible effects of ring spinning triangle division on yarn qualities are analyzed according to the numerical simulations and previous results. In addition, the properties of spun yarns produced by the modified ring spinning system were evaluated and analyzed.

Research on the mechanism of the modified ring-spinning system using a dynamic twist-resistant device and its yarn quality

2018 ◽  
Vol 89 (15) ◽  
pp. 3169-3177 ◽  
Author(s):  
Ruiqi Shao ◽  
Longdi Cheng ◽  
Yanping Yu ◽  
Jianxin Xu ◽  
Jianming Wu
Keyword(s):  
High Speed ◽  
Twist Angle ◽  
Particle Flow Code ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Significant Difference ◽  
Cotton Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
The Comparative Study

The spinning triangle is a critical area in the ring-spinning process; the geometry of the spinning triangle influences the distribution of the fiber tension, and affects the qualities of the spun yarn. In this paper, a kind of dynamic twist-resistant device that can affect the geometry of the spinning triangle is employed for improving the conventional ring-spinning system.  The yarn twists between the front roller nip and dynamic twist-resistant device were captured in the spinning process using a high-speed camera. Comparing yarn twists of the two types of yarn, the modified yarns have a lower twist angle, indicating that the device can produce resistant torque. Particle Flow Code software was used to simulate the acts of the device on the yarn, and the results verified the existence of resistant torque. The resistant torque on the yarn affects the geometry of the spinning triangle and the distribution of fiber tension. In addition, 19.4 and 14.5 tex cotton yarns with three different twists, 700, 800 and 900 tpm, were produced by the modified and conventional ring spinning. The comparative study revealed that the modified yarns have a better performance in terms of yarn strength and hairiness, and show no significant difference in terms of the yarn evenness when compared with the conventional yarns at the same twist level. The mechanism of the effect of the dynamic twist-resistant device on yarn qualities is discussed by analyzing the distribution of fiber tension.

scholarly journals Theoretical Study of the Effects of the General Division of a Ring Spinning Triangle on Fibre Tension

2016 ◽  
Vol 24 (2(116)) ◽  
pp. 37-43
Author(s):  
Xuzhong Su ◽  
Xuzhong Su ◽  
Weidong Gao ◽  
Weidong Gao ◽  
Xinjin Liu ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Ring Spinning ◽  
Fibre Tension ◽  
Spinning Triangle

Theoretical study of the effects on yarn strength in a modified ring spinning system

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5014-5023 ◽  
Author(s):  
Ruiqi Shao ◽  
Longdi Cheng ◽  
Wenliang Xue ◽  
Yanping Yu ◽  
Ruiyun Zhang
Keyword(s):  
Inclination Angle ◽  
Theoretical Study ◽  
Interaction Effects ◽  
Ring Spinning ◽  
Yarn Strength ◽  
Twist Multiplier ◽  
Small Influence ◽  
Spinning Triangle

A modified ring spinning system using a dynamic twist-resistant device has been employed to produce yarn. The modified device blocks twist to propagate to the spinning triangle, which changes the distribution of twist in the spinning area and increases the height of the spinning triangle. In this paper, two kinds of yarn counts (30 and 40 Ne) are spun in the conventional and modified ring spinning with twist multipliers of 3.2, 3.6, and 4.0. The results show that the yarn spun by the modified ring spinning system possesses a higher strength compared with the conventional yarn except in the higher twist multiplier. The increase in yarn strength was theoretically analyzed according to the model of yarn strength. The yarn strength was calculated by considering the original fiber strain in the yarn and the fiber strain due to yarn strain. In the model, the fiber migration was considered and the fiber entanglement caused by fiber migration was ignored to simplify the calculation. Four potentially important parameters of the spinning triangle, the height of the spinning triangle, the migration coefficient, the inclination angle, and the spinning tension, were proposed and their individual and interaction effects on yarn strength were analyzed. The results demonstrate that yarn strength increased with the increase of height of the spinning triangle and the migration coefficient. The inclination angle and the spinning tension have a relatively small influence on yarn strength when the height of the spinning triangle is higher.

Theoretical Study on the Geometric and Dynamic Performance of Ring Spinning Triangle with Finite Element Method

2010 ◽  
Author(s):  
Sheng Yan Li ◽  
Bin Gang Xu ◽  
Xiao Ming Tao ◽  
Jane W. Z. Lu ◽  
Andrew Y. T. Leung ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Study ◽  
Dynamic Performance ◽  
Ring Spinning ◽  
Spinning Triangle ◽  
Element Method

Reducing Yarn Hairiness in a Modified Ring Spinning Yarn Path by Various Offsets

2011 ◽  
Vol 331 ◽  
pp. 493-497
Author(s):  
Xu Zhong Su ◽  
Wei Dong Gao ◽  
Ting Ting Wu ◽  
Xin Jin Liu ◽  
Yun Zhang
Keyword(s):  
Critical Region ◽  
Breaking Force ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Yarn Hairiness ◽  
The Right

Spinning triangle is a critical region in the spinning process of yarn. Its geometry influences the distribution of fiber tension in the spinning triangle and the properties of spun yarns, such as the yarn breakage and hairiness. In this paper, the relationships between the spinning angle and yarn properties especially the yarn hairiness were investigated under various horizontal offsets. The properties of spun yarns produced by the modified system were evaluated and analyzed. Both left diagonal and right diagonal yarn arrangements were examined. The results indicate that the right diagonal yarn path leads to reduce yarn hairiness but the left diagonal yarn path leads to increase yarn hairiness; the breaking force of yarn changes little; yarn evenness deteriorates slightly with the changes of offset.

scholarly journals Theoretical Study of N-Heterocyclic-Carbene–ZnX2 (X = H, Me, Et) Complexes

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6147
Author(s):  
Mirosław Jabłoński
Keyword(s):  
Theoretical Study ◽  
Twist Angle ◽  
Steric Effects ◽  
Torsional Angle ◽  
Steric Repulsion ◽  
Hydrogen Atoms ◽  
Wide Range ◽  
The Relationship ◽  
Tetrel Bonds ◽  
Negligible Influence

This article discusses the properties of as many as 30 carbene–ZnX2 (X = H, Me, Et) complexes featuring a zinc bond C⋯Zn. The group of carbenes is represented by imidazol-2-ylidene and its nine derivatives (labeled as IR), in which both hydrogen atoms of N-H bonds have been substituted by R groups with various spatial hindrances, from the smallest Me, iPr, tBu through Ph, Tol, and Xyl to the bulkiest Mes, Dipp, and Ad. The main goal is to study the relationship between type and size of R and X and both the strength of C⋯Zn and the torsional angle of the ZnX2 plane with respect to the plane of the imidazol-2-ylidene ring. Despite the considerable diversity of R and X, the range of dC⋯Zn is quite narrow: 2.12–2.20 Å. On the contrary, D0 is characterized by a fairly wide range of 18.5–27.4 kcal/mol. For the smallest carbenes, the ZnX2 molecule is either in the plane of the carbene or is only slightly twisted with respect to it. The twist angle becomes larger and more varied with the bulkier R. However, the value of this angle is not easy to predict because it results not only from the presence of steric effects but also from the possible presence of various interatomic interactions, such as dihydrogen bonds, tetrel bonds, agostic bonds, and hydrogen bonds. It has been shown that at least some of these interactions may have a non-negligible influence on the structure of the IR–ZnX2 complex. This fact should be taken into account in addition to the commonly discussed R⋯X steric repulsion.

A Theoretical Study of Submarining Tendency of a Hybrid III 5th Percentile Female Dummy

2009 ◽  
Author(s):  
Liang Tang ◽  
Qing Zhou
Keyword(s):  
Finite Element ◽  
Theoretical Study ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Frontal Impact ◽  
The Third ◽  
Kinematic Relationship ◽  
Hybrid Iii ◽  
Crash Tests ◽  
Force Equilibrium

This paper presents a theoretical study on the assessment of submarining tendency of a Hybrid III 5th percentile female crash dummy in frontal impact crash tests. Three candidate criteria for submarining tendency assessment were presented and examined. The first two criteria were derived based on the kinematic relationship between the lap-belt and the pelvis. The third criterion was derived based on the force equilibrium of the lap-belt and pelvis system. Nonlinear finite element models were used together with the use of a Hybrid III 5th percentile female crash dummy model to evaluate these candidate analysis methods.

Theoretical study on a spinning triangle with fiber superposition

2015 ◽  
Vol 85 (15) ◽  
pp. 1541-1552 ◽  
Author(s):  
Xinjin Liu ◽  
Xiaoyan Liu ◽  
Xuzhong Su
Keyword(s):  
Theoretical Study ◽  
Spinning Triangle
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