scholarly journals Effects of process variables on physical characteristics of tri-component elastic-conductive composite yarns (t-ECCYs) using a modified ring frame

2018 ◽  
Vol 69 (01) ◽  
pp. 17-23 ◽  
Author(s):  
YONG WANG ◽  
WEIDONG YU ◽  
FUMEI WANG
Keyword(s):  
Physical Characteristics ◽  
Spindle Speed ◽  
Shape Preservation ◽  
Shielding Effectiveness ◽  
Process Variables ◽  
Conductive Composite ◽  
Good Shape ◽  
Fabrication Procedure ◽  
Strand Spacing ◽  
Helical Winding

The fabrication procedure of tri-component elastic-conductive composite yarns (t-ECCYs) with distinctive architecture, which employs elastane filament as a core and stainless steel filament combining with rayon assemblies as a helical winding around the extensible core, was demonstrated. Then, a single factorial-analysis technique was applied to investigate the effects of processing variables, i.e., strand spacing, twist level and spindle speed, on some physical characteristics and spinning geometries of the resultant yarns, in terms of breaking tenacity, extension at break, elasticity, hairiness, unevenness, and visual features. Then, the electrical behavior was conducted. It is well established that the preparatory process variables play a significant role in deciding the physical characteristics of the final yarns. The Relationship between spinning geometries and yarn properties were highlighted. Experimental results revealed that the optimized physical performances of t-ECCYs were obtained at 10.5 mm strand spacing, 700 T/m twist, and 7000 rpm spindle speed. The resultant t-ECCYs could be a high-valuable proposition for special purposes in electrical textiles. The yarn itself is available as a base sensor element with substantial stretch and high conductivity, and such yarns could be easily processed into fabrics by conventional textile means offering fabrics with good shape preservation based on superior elasticity, even electromagnetic shielding effectiveness with metal monofilament inside, and can thus be applied as lightweight miniature electronics in the future.

Strand-spacing dependency on the tensile response of tri-component elastic-conductive composite yarns

2018 ◽  
Vol 89 (7) ◽  
pp. 1237-1245 ◽  
Author(s):  
Yong Wang ◽  
Weidong Yu ◽  
Fumei Wang
Keyword(s):  
Large Scale ◽  
Scale Production ◽  
Electronic Textiles ◽  
Conductive Composite ◽  
Large Scale Production ◽  
Significant Difference ◽  
Fabrication Procedure ◽  
Tensile Data ◽  
Strand Spacing ◽  
Wearable Electronic

This study focuses on the effect of strand spacing on the tensile behavior of tri-component elastic-conductive composite yarns (t-ECCYs). The fabrication procedure of t-ECCYs was previously reported using a modified ring frame. The tensile data were analyzed with SPSS using one-way analysis of variance followed by post hoc Fisher’s least significant difference test (α = 0.05). The results demonstrate that with elevated strand spacing up to 14.0 mm, the breaking tenacity and extension at break of yarns increase, beyond which they reduce, and mean results were considered significantly different. Furthermore, a two-parameter Weibull distribution and box-whisker plot can be appropriately used to quantify the variability of tensile strength. It is evident that strand spacing plays a crucial role in influencing the structure and hence the final behavior of yarns. The shape of twisting triangle was obviously asymmetric, primarily due to modulus differences of its sub-strands in the resulting yarns. In particular, a bottom-and-right displacement of convergence points was observed with the increasing strand spacing. Finally, the electrical conductivity of t-ECCYs in various stretching states was characterized. With the superior conductivity under different stretching, t-ECCYs have tremendous prospects for wearable electronic applications. More importantly, desirable characteristics that are possibly possessed by the yarns are industrial weavability and knittability, which will pave a convenient but highly effective way for the large-scale production of wearable electronic textiles.

Experiments of Drilling Titanium Alloy with Varying Operation Parameters

2017 ◽  
Vol 748 ◽  
pp. 254-258
Author(s):  
Chang Yi Liu ◽  
Bai Shou Zhang ◽  
Suman Shrestha
Keyword(s):  
Titanium Alloy ◽  
Feed Rate ◽  
Thrust Force ◽  
Maximum Amount ◽  
Spindle Speed ◽  
Drilling Process ◽  
Process Variables ◽  
Experimental Cutting ◽  
Operation Parameters ◽  
Titanium Alloy Ti6al4v

Drilling experiments of titanium alloy Ti6Al4V were conducted. Taking the speed and feed as the process variables, a set of experimental cutting forces are obtained and compared. From the experimental results it is concluded that within the experimental extent the thrust force and torque of drilling process rises with the feed rate. The lower spindle speed resulted in the greater amount of thrust. Feed rates have greater influence on the thrust force than the spindle speed. The combination of greater feed rate and lower spindle speed results in the maximum amount of thrust. However, combination of greater feed rate and spindle speed resulted in maximum amount of torque.

Electromagnetic Shielding Effectiveness and Manufacturing Technique of Metal Complex Fabrics

2014 ◽  
Vol 496-500 ◽  
pp. 472-475
Author(s):  
Ching Wen Lou ◽  
An Pang Chen ◽  
Ting An Lin ◽  
Ya Yuan Chuang ◽  
Jia Horng Lin
Keyword(s):  
Metal Complex ◽  
Life Time ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Test Results ◽  
Test Frequency ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Composite Yarn ◽  
Electromagnetic Shielding Effectiveness

In the research, The electromagnetic interferences (EMI) have drastically increased and can disrupt and reduce the life time and the efficiency of devices. Therefore, the electromagnetic shielding problem is become the important issue. In the research, Ni wire and Cu wire (Floodlit Enterprise Co., Ltd.) were used to make the Ni conductive composite yarn and Cu conductive composite yarn via an electrical covering machine. And the Cu conductive composite yarn was fabricated to the woven fabrics with the plain weaving. The test results revealed that the EMSE of the W/K/W complex fabrics have stable EMSE than the W/W/W complex fabrics when the laminated at the same direction. The W/90W/W complex woven fabrics were shown the best EMSE of 46.25 dB, which the test frequency is 1800 MHz.

Flash calcines of kaolinite: Effect of process variables on physical characteristics

1992 ◽  
Vol 27 (9) ◽  
pp. 2490-2500 ◽  
Author(s):  
R. C. T. Slade ◽  
T. W. Davies ◽  
H. Atak�l ◽  
R. M. Hooper ◽  
D. J. Jones
Keyword(s):  
Physical Characteristics ◽  
Process Variables

Measurement of Electromagnetic Shielding Effectiveness of the Composite Carbon Fibers/Nickel Thin Film

2010 ◽  
Vol 437 ◽  
pp. 580-583
Author(s):  
Ho Chang ◽  
Yun Min Yeh ◽  
Ching Song Jwo ◽  
Sih Li Chen
Keyword(s):  
Carbon Fiber ◽  
Average Particle Size ◽  
Composite Films ◽  
Waterborne Polyurethane ◽  
Electromagnetic Shielding ◽  
Average Particle ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Blending Method ◽  
Electromagnetic Shielding Effectiveness

This paper presents the development of a conductive composite film and the measurement of electromagnetic (EM) shielding effectiveness (SE) of the prepared film. A coaxial transmission-line technique based on ASTM D4935-99 Standard was used to measure the electromagnetic shielding effectiveness. A nickel nanofluid with an average particle size of 50 nm was prepared with a self-developed nanofluid synthesis system. By using a polymer blending method, carbon fiber and carbon fiber/nickel nanoparticles were blended with waterborne polyurethane (WPU) to prepare conductive composite films of 0.25 mm thick. Experimental results have shown that the electromagnetic shielding effectiveness value of the prepared conductive composite material can reach 26 dB within the range of 50 MHz ~ 1.5GHz.

Elastohydrodynamic Lubrication Modeling of Hydrodynamic Nanopolishing Process

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Rinku Mittal ◽  
Ramesh K. Singh ◽  
Suhas S. Joshi
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Particle Concentration ◽  
Diamond Turning ◽  
Spindle Speed ◽  
Work Piece ◽  
Process Variables ◽  
Polishing Process ◽  
Mean Pressure ◽  
Abrasive Suspension

Nanopolishing processes are used in medical, industrial, telecommunication, optics, and military fields. Hydrodynamic polishing (HDP) is one of the prominent nanopolishing methods in creating nanopolished surfaces on hard and profiled surfaces, where rigid tool-based methods like diamond turning, grinding, and honing have many limitations. This work is focused on modeling of hydrodynamic polishing method. In this method, a film of abrasive suspension is formed between the work-piece surface and a rotating soft tool, which helps in nanopolishing. The past experimental research gives an insight into the process but the process has not been explicitly modeled. Consequently, besides experimental characterization, a numerical/mathematical model of hydrodynamic polishing process is important. This paper presents a model of the HDP process which takes into account the polishing process variables, such as, contact load, spindle speed, tool and work-piece material properties/geometry, and abrasive suspension properties. The response of the model is the pressure distribution and the abrasive film thickness in the polishing zone. To model the elastohydrodynamic process encountered in HDP, the pressure and the film thickness profiles of lubricated isothermal point contacts have been evaluated using the multilevel multi-integration (MLMI) scheme coded in C programming language. Finally, load, tool stiffness, speed, and particle concentration in the suspension have been implicitly correlated to the surface roughness (SR) to evolve a semi-empirical model for surface roughness as a function of mean film thickness and mean pressure. Empirical models for mean film thickness and mean pressure have also been developed as a function of process variables. These models have been developed from a Taguchi L27 orthogonal array wherein the mean pressure/film thickness values have been determined from the model and the average surface roughness values have been measured experimentally. It has been observed that the load does not affect the surface roughness significantly and mean pressure does not change with the change in abrasive size and spindle speed. Abrasive particle concentration has been found to be the most important parameter and it affects the surface roughness significantly.

scholarly journals Electromagnetic wave shielding and mechanical properties of vapor-grown carbon nanofiber/polyvinylidene fluoride composite fibers

2020 ◽  
Vol 15 ◽  
pp. 155892502098595
Author(s):  
Metin Yuksek
Keyword(s):  
Tensile Strength ◽  
Carbon Nanofibers ◽  
Polyvinylidene Fluoride ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Woven Fabric ◽  
Shielding Effectiveness ◽  
Composite Fibers ◽  
Conductive Composite ◽  
Electromagnetic Shielding Effectiveness

The demand for multifunctional requirements in aerospace, military, automobile, sports, and energy applications has encouraged the investigation of new conductive composite fibers. This study focuses on the development of Vapor-grown carbon nanofibers (VGCNFs) filled Polyvinylidene Fluoride (PVDF) composite fibers. Polyvinylidene fluoride (PVDF) reinforced with (1, 3, 5, and 8 wt.%) carbon nanofibers were produced as a masterbatch. The production of PVDF and PVDF/CNF composite fibers have been done successfully by using melt spinning processing technique. Conductive woven fabrics were produced with composite fibers on handloom machines to measure electromagnetic interference (EMI) shielding efficiency. Tensile strength of fibers increased with increase in CNF loading up to 3%. The tensile strength displayed a decrease of 5% and 8% CNF loading. Electromagnetic shielding effectiveness (EMSE) of woven fabrics with composite fibers were tested by using the coaxial transmission line method for planar materials standard that is based on ASTM D 4935-10. The electromagnetic shielding effectiveness of woven fabric which is consist of conductive composite fibers were increased with increasing CNFs loading and amount of fabric layers. It can be seen that the woven fabrics displayed between 2–10 dB and 2–4 dB EMSE values in the 15–600 MHz and 600–3000 MHz-frequency range, respectively. Nevertheless, it was observed that conductive filler content, dispersion, and network formation within the composite fibers were highly influent on the electromagnetic shielding effectiveness performance of the structures.

Analyzing the effect of spinning process variables on blow room blended cotton melange yarn quality

2018 ◽  
Vol 22 (1) ◽  
pp. 2-14 ◽  
Author(s):  
Suchibrata Ray ◽  
Anindya Ghosh ◽  
Debamalya Banerjee
Keyword(s):  
Quality Parameters ◽  
Spindle Speed ◽  
Process Variables ◽  
Content Type ◽  
Yarn Strength ◽  
Yarn Quality ◽  
Yarn Twist ◽  
Twist Multiplier ◽  
Spinning Process ◽  
Shade Depth

Purpose The use and importance of mélange yarn in apparel sector is increasing day by day. With the gradual increase in market share, achieving the desired quality level of mélange yarn remains a challenge for yarn manufacturing industry. The purpose of this paper is to investigate the effect of raw material (dyed fiber percentage in the mixing), important spinning process variable (yarn twist multiplier) and productivity (spindle rpm of ring frame) on properties of cotton mélange spun yarn. Design/methodology/approach Box and Behnken Design of experiment has been used to investigate the important yarn quality parameters like evenness, imperfection, hairiness, breaking strength and breaking elongation of blow room blended cotton mélange yarn. The quadratic regression model is used to derive the statistical inferences about sensitivity of the yarn quality parameters to the different process variables. The response surfaces are constructed for depicting the geometric representation of yarn quality parameters plotted as a function of process variables. Findings The study shows that shade depth and spindle speed have significant effects on the mélange yarn unevenness and imperfections. Mélange yarn strength and hairiness are significantly affected by shade depth and yarn twist multiplier (TM). Yarn elongation at break is only influenced by the spindle speed. A darker shade is responsible for higher yarn unevenness, imperfection, hairiness and lower yarn strength. A higher spindle speed is also liable for deterioration of yarn quality. Practical implications Many spinning industries are planning to convert their existing spindles from normal gray yarn production to mélange yarn manufacturing. The outcome of this study will lead to achieve better mélange yarn quality and productivity by the industry. Originality/value Research on mélange yarn is itself scant. This study is exclusively conducted to analyze the individual and interactive effect of various process parameters on the mélange yarn quality.

scholarly journals Preparation Technique and EMI Shielding Evaluation of Flexible Conductive Composite Fabrics Made by Single and Double Wrapped Yarns

2017 ◽  
Vol 12 (4) ◽  
pp. 155892501701200
Author(s):  
Ching-Wen Lou ◽  
Ting-Ting Li ◽  
Po-Wen Hwang ◽  
An-Pang Chen ◽  
Jia Horng Lin
Keyword(s):  
Single Layer ◽  
Volume Resistivity ◽  
Preparation Technique ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Complex Yarn ◽  
Biological Health ◽  
Composite Fabrics ◽  
Electromagnetic Shielding Effectiveness ◽  
Instrument Accuracy

Electronics products and communication equipment release electromagnetic (EM) waves in service. EM waves affect biological health and precision instrument accuracy. This study purposes to fabricate flexible conductive composite fabric which is made of complex yarn using metal (stainless steel, copper) fibers and PET filaments. Complex yarn is formed by a rotor twisting machine, at varying values of wrapped number (6.5-16 turns/cm) and lamination number (single-layer, double-layer). Results show that when the complex yarn was wrapped 16 turns/cm, volume resistivity reached 2.9 Ohm-cm and conductivity reaches 0.408 S/cm. Four layers of conductive composite plied with 0°/90°/ 0°/ 90° resulted in the optimum electromagnetic shielding effectiveness, up to 47.7 dB.

Sign in / Sign up

Export Citation Format

Share Document