Analysis of the Additional Twists on the Fiber Band in Compact Field of Compact Spinning

2011 ◽  
Vol 175-176 ◽  
pp. 380-384
Author(s):  
Jun Wang ◽  
Han Guang Liu ◽  
Jian Ping Yang ◽  
Guang Wei Chen ◽  
Ting Fu
Keyword(s):  
Mathematic Model ◽  
Factors Affecting ◽  
Tilting Angle ◽  
Compact Field ◽  
Spun Yarn ◽  
Compact Spinning ◽  
Spinning Speed ◽  
Suction Slot

Based on the analysis of the motion of fiber band in compact field, a mathematic model is proposed in this article. The factors affecting the additional twists and final twists of the compact spun yarn, such as diameter of the fiber band in the compact field, tilting angle of suction slot in profile tube and spinning speed, were discussed in detail. The validity of the model was validated by experiments.

Study on the model of semi-open-end twist in compact spinning with lattice apron

2020 ◽  
pp. 004051752094254
Author(s):  
Ting Fu ◽  
Yuze Zhang ◽  
Nicholus Tayari Akankwasa ◽  
Nanliang Chen ◽  
Huiting Lin
Keyword(s):  
Dynamic Model ◽  
Experimental Test ◽  
Negative Pressure ◽  
Flow Simulation ◽  
Slot Width ◽  
Arc Shape ◽  
Simulation Results ◽  
Compact Spinning ◽  
Suction Slot ◽  
Linear Shape

The twist mechanism of the fiber strand in the condensing zone in compact spinning is complex. This paper proposes a dynamic model to evaluate the additional twist of the fiber strands. Based on the flow simulation in the condensing zone, the fiber trajectory in the suction slot was simulated and obtained. Several spinning parameters such as suction slot angle, suction slot width, negative pressure, and shape of suction slot, were varied to show their effects on the additional twist. The simulation results indicated that by increasing the suction slot angle from 5° to 10° the additional twist increased significantly. Higher negative pressure also leads to an increase in the additional twist. The suction slot width has a greater effect on the fiber trajectory than on the additional twist. An arc-shape suction slot increased the additional twist compared with a linear-shape one. An experimental test conducted revealed a precise agreement with the simulation results.

Pecvd Grown p-i-n Si and Si,Ge Thin Film Photodetectors For Integrated Oxygen Sensors

2007 ◽  
Vol 989 ◽  
Author(s):  
Debju Ghosh ◽  
Ruth Shinar ◽  
Vikram L. Dalal ◽  
Zhaoqun Zhou ◽  
Joseph Shinar
Keyword(s):  
Thin Film ◽  
Response Time ◽  
Response Times ◽  
Optical Filters ◽  
Oxygen Sensors ◽  
Sensor Calibration ◽  
Boron Diffusion ◽  
Factors Affecting ◽  
Compact Field ◽  
Oxygen Sensitive

AbstractRecent efforts to advance photoluminescence (PL)-based oxygen sensors have focused on developing compact, field-deployable devices. This has led to organic light emitting device (OLED)-based sensors with a structurally integrated [OLED excitation source]/[sensing film] module. To additionally integrate a photodetector (PD), PECVD for fabrication of thin-film p-i-n and n-i-p Si- and Si,Ge-based PDs was employed. O2 concentrations are advantageously determined by monitoring the effect of O2 on shortening the PL decay time  of an oxygen-sensitive dye, rather than on quenching its PL intensity. This approach, which employs pulsed OLEDs, eliminates the need for frequent sensor calibration, minimizes issues associated with background light, and eliminates the need for optical filters, which lead to bulkier sensors. However, it requires PDs with response times significantly shorter than . Therefore, the development of thin-film PDs focused on decreasing their response time, and understanding the factors affecting it. In this paper we show that boron diffusion during growth from the p+ to the i layer increases the response time of PECVD grown p-i-n PDs. Incorporating a SiC buffer layer and fabricating superstrate structures, where the p+ layer is grown last, decrease it. Additionally, ECR fabricated PDs show a slower response in comparison to VHF PECVD-grown PDs.

Theoretical analysis of the yarn fracture mechanism of self-twist jet vortex spinning

2016 ◽  
Vol 87 (11) ◽  
pp. 1394-1402 ◽  
Author(s):  
Chenchen Han ◽  
Wenliang Xue ◽  
Longdi Cheng ◽  
Zhuanyong Zou
Keyword(s):  
Theoretical Analysis ◽  
Tensile Properties ◽  
Contact Area ◽  
Fracture Mechanism ◽  
The Self ◽  
Mutual Contact ◽  
Spun Yarn ◽  
Spinning Speed

According to the yarn mechanism of self-twist jet vortex spinning, this article analyzes the structure and the fracture mechanism of self-twist jet vortex spinning yarn. Combined with experiments, this article established that the fiber in self-twist jet vortex spun yarn has self-twist, which increases the mutual contact area and the cohesion between the fibers in the yarn. This is helpful to improve the evenness and tensile properties of jet vortex spun yarn. The self-twist jet vortex spinning can keep the high spinning speed of the jet vortex spinning at the same time. The research on self-twist jet vortex spinning lays the foundation for the research and the development of jet vortex spinning.

Mechanical modeling of an arc-shaped suction slot for compact spinning and analysis of additional twists

2017 ◽  
Vol 88 (21) ◽  
pp. 2499-2505 ◽  
Author(s):  
Ting Fu ◽  
Jianping Yang ◽  
Guangwei Cheng ◽  
Nanliang Chen ◽  
Yiping Qiu
Keyword(s):  
Frictional Coefficient ◽  
Mechanical Analysis ◽  
Curvature Radius ◽  
Model Design ◽  
Mechanical Modeling ◽  
Obvious Effect ◽  
Runge Kutta Method ◽  
Compact Spinning ◽  
Suction Slot ◽  
Fibrous Strand

In this study, an arc-shaped suction slot was designed for a pneumatic compact spinning system with a lattice apron. A model was built via mechanical analysis of a fibrous strand in an arc-shaped suction slot to calculate additional twists inserted during condensing. The equations can be solved by using the Runge–Kutta method. The simulation results showed that negative pressure and frictional coefficient of the lattice apron and the fibrous strand have significant effects on additional twists of the strand in an arc-shaped slot. The curvature radius of the arc slot has some influence on the additional twists, while that of the condensing surface has no obvious effect on the additional twists. The radius of the strand may significantly influence the additional twists, but the radius of the strand itself is affected by various other factors. Spinning tests were carried out based on the model design. These results verified the additional twist model of the arc-shaped suction slot.

Investigation into four-roller compact spinning with air damper for improving yarn performance

2021 ◽  
pp. 004051752110246
Author(s):  
Yanan Yang ◽  
Xiaoxia Sun ◽  
Zhimin Li ◽  
Xinhou Wang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Low Cost ◽  
High Grade ◽  
Spun Yarn ◽  
Potential Applications ◽  
Spinning Triangle ◽  
Yarn Hairiness ◽  
Compact Spinning

Compact spinning, as a new kind of spinning technology, has gained wide attention because of its great reduction in spinning triangle and yarn hairiness. In order to meet the demand of high-grade clothing, research on further improving the performance of compact spun yarn is the emphasis. Of all the existing compact spinning systems, the four-roller compact spinning with lattice apron is most widely used at present because of its low cost. Therefore, this paper aims to put forward a new kind of device to improve yarn performance for four-roller compact spinning systems. Related experiments have been done to verify the efficiency of the device, and the mechanism is analyzed by computational fluid dynamics. The numerical simulation shows that the device can change the direction of airflow and increase the velocity in the directions of transverse condensing and thickness. It is shown that the air damper is convenient to use and has potential applications in spinning compact yarns with better performance.

Numerical simulation on the condensing effect of suction slot in compact spinning with lattice apron

2012 ◽  
Vol 103 (10) ◽  
pp. 1116-1126 ◽  
Author(s):  
Wenliang Xue ◽  
Mengyuan Wei ◽  
Ni Zhang ◽  
Longdi Cheng
Keyword(s):  
Numerical Simulation ◽  
Compact Spinning ◽  
Suction Slot

Numerical simulation of fiber strands on condensing effect of suction slot in compact spinning with lattice apron

2014 ◽  
Vol 15 (5) ◽  
pp. 1084-1091 ◽  
Author(s):  
Chenchen Han ◽  
Mengyuan Wei ◽  
Wenliang Xue ◽  
Longdi Cheng
Keyword(s):  
Numerical Simulation ◽  
Compact Spinning ◽  
Suction Slot

scholarly journals Research on the Qualities of Cellulosic Yarn

2018 ◽  
Vol 26 (1(127)) ◽  
pp. 30-35
Author(s):  
Iwona Frydrych ◽  
Xuzhong Su ◽  
Xiaoxuan Qin ◽  
Xiaoxuan Qin ◽  
Xiaoxuan Qin ◽  
...  
Keyword(s):  
Cross Sections ◽  
Viscose Fibre ◽  
Breaking Strength ◽  
Ring Spinning ◽  
Textile Processing ◽  
Sampling Device ◽  
Spun Yarn ◽  
Fundamental Process ◽  
Spun Yarns ◽  
Compact Spinning

Cellulosic fibre is a kind of renewable fibre that has attracted more and more attention in textile processing recently. Yarn spinning is the first fundamental process in textile processing. Therefore, in this paper, taking viscose fibre and tencel fibre as examples, the qualities of cellulosic yarn were studied. Three kinds of pure viscose and tencel yarn: 14.6 tex (40S), 9.7 tex (60S) and 7.3 tex (80S), were spun on a ring spinning system modified with lattice apron compact spinning (LACS) and complete condensing spinning (CCS), respectively. The spun yarn qualities, yarn evenness, breaking strength and hairiness, were tested and comparatively analysed. Then two kinds of cellulosic blend yarn including 14.6 tex, 9.7 tex and 7.3 tex JC/R 60/40 yarn, and 14.6 tex, 9.7 tex and 7.3 tex JC/T 70/30 yarns were spun on a ring spinning system modified with CCS. The spun yarn evenness, breaking strength and hairiness were tested, and the cross sections of the spun yarns were presented using a Y172 Hardy’s thin cross-section sampling device. The results show that for both the pure viscose and tencel yarn, compared with LACS, CCS has better yarn evenness, a little lower yarn breaking strength and a little more hairiness, while the uniformity of yarn qualities are all improved. For the cellulosic blend yarn, compared with the pure cellulosic yarn, yarn evenness is worse, especially for the cotton and tencel blend yarn.

scholarly journals Information Modeling and Analysis of Labour Productivity Dynamics at Enterprises-Leaders

2021 ◽  
pp. 118-132
Author(s):  
P. A. Mikhnenko
Keyword(s):  
Productivity Growth ◽  
System Analysis ◽  
Labour Productivity ◽  
Mathematic Model ◽  
Information Modeling ◽  
Modeling And Analysis ◽  
Factors Affecting ◽  
Industrial Enterprises ◽  
Labour Productivity Growth ◽  
Productivity Dynamics

Serious growth in labour productivity is an essential task of Russian economy today, which was formulated in the national goals of the Russian Federation and the national project ‘Labour Productivity and Employment Support'. Current mathematic models and methods of analyzing the given problem cannot identify key factors affecting the capacity of the enterprise to provide a considerable growth in productivity in the short-term and medium-term perspective. The article puts forward a mathematic model for analyzing labour productivity dynamics, which was designed on the informational approach to system analysis. Specific features of the model are the use of the hypothesis theorem to get estimation of relative probability of achieving the target indicator and 2 variants of interpretation of probability to realize the situation factor. The research object is representative sample of industrial enterprises in Russia included in the top-100 leaders by labour productivity growth. The authors set and resolved the task to estimate relative steps of target information that determine the degree of conformity of an increase in key finance and economic parameters with attaining the goal, i.e. growth in labour productivity at the enterprise in 3-year perspective. As a result of modeling it was shown that the degree of relative expediency of high rates of proceed rise tend to decline as the ranges of labour productivity grow. At the same time the degree of relative of high rates of asset turn-over growth steps up in line with decreasing durability of operative cycle of the enterprise. In contrast to many works dealing with this problem it was shown that relative expediency of fundequipment at the enterprise is more noticeable for medium and high rates of labour productivity growth and extremely low in the record range. The obtained results demonstrate applied opportunities to use logic-mathematic tools of the information approach to analyze indicators of economic efficiency of business.

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