Yarn and fabric properties in a modified ring spinning system considering the effect of the friction surface of the false-twister

2019 ◽  
Vol 90 (5-6) ◽  
pp. 572-580 ◽  
Author(s):  
Rong Yin ◽  
Xiao-Ming Tao ◽  
Bin-gang Xu
Keyword(s):  
Surface Roughness ◽  
Friction Surface ◽  
Experimental Results ◽  
Material Surface ◽  
Ring Spinning ◽  
Knitted Fabrics ◽  
Yarn Properties ◽  
Cotton Yarns ◽  
The Relationship

This paper experimentally studies the relationship between the friction surface of a false-twisting unit and the quality of cotton yarns produced by a modified ring spinning system, with the adoption of the single friction-belt false-twister. The friction surface of the false-twisting unit, as a key twisting component, has been studied in terms of material, surface roughness, hardness and diameter, as well as the interaction between these factors and resultant yarn properties, with particular attention to yarn imperfections. Experimental results showed that the false-twisting unit with a short interactive path demonstrated significant reduction of yarn imperfections, especially yarn neps. With the optimal false-twisting unit, performances of the modified yarns and their knitted fabrics were evaluated and compared with the conventional ones.

The Influence of Surface Texture on Abrasive Wear

2019 ◽  
Vol 823 ◽  
pp. 33-40 ◽  
Author(s):  
Yu Tong Hu ◽  
Yong Yong He ◽  
Wei Wang
Keyword(s):  
Friction Coefficient ◽  
Femtosecond Laser ◽  
Abrasive Wear ◽  
White Light ◽  
Surface Texture ◽  
Friction Surface ◽  
Surface Texturing ◽  
Experimental Results ◽  
The Relationship ◽  
Main Factor

Friction happens everywhere. Abrasives generated in tribological process will result in secondary wear. Abrasive wear is a kind of rather common but harmful wear, which is the main reason for the damage of fifty-percent mechanical components by friction. Surface texturing is an effective method to improve the tribological and lubricating performance of tribo-pairs. In this paper, with different-size diamond particles added into the lubricant and a surface of the tribo-pairs textured by different parameters (diameter and depth) with femtosecond laser, the relationship between the surface texture and the abrasive wear was researched, and the influence of the texture on the abrasive wear was analyzed. The friction experiments were carried out on UMT3. The microstructures were tested and analyzed by SEM, microscope and White Light Interferometer respectively. The experimental results showed that the size of the surface texture, compared with that of abrasives, is the main factor which determines the friction coefficient. As the size of the surface texture is much bigger than that of the abrasives, the texture can accommodate the abrasives efficiently, and thus the friction coefficient is reduced efficiently.

scholarly journals Impact of Structural Defects on the Surface Quality of Hardwood Species Sliced Veneers

2020 ◽  
Vol 10 (18) ◽  
pp. 6265
Author(s):  
Vasiliki Kamperidou ◽  
Efstratios Aidinidis ◽  
Ioannis Barboutis
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Wood Species ◽  
Research Work ◽  
Structural Defects ◽  
Material Surface ◽  
Typical Structure ◽  
Hardwood Species ◽  
The Impact

The surface roughness constitutes one of the most critical properties of wood and wood veneers for their extended utilization, affecting the bonding ability of the veneers with one another in the manufacturing of wood composites, the finishing, coating and preservation processes, and the appearance and texture of the material surface. In this research work, logs of five significant European hardwood species (oak, chestnut, ash, poplar, cherry) of Balkan origin were sliced into decorative veneers. Their surface roughness was examined by applying a stylus tracing method, on typical wood structure areas of each wood species, as well as around the areas of wood defects (knots, decay, annual rings irregularities, etc.), to compare them and assess the impact of the defects on the surface quality of veneers. The chestnut veneers presented the smoothest surfaces, while ash veneers, despite the higher density, recorded the highest roughness. In most of the cases, the roughness was found to be significantly lower around the defects, compared to the typical structure surfaces, probably due to lower porosity, higher density and the presence of tensile wood. The results reveal that the presence of defects does not affect the roughness of the veneers and increases neither the processing requirements of the veneer sheets before finishing, nor the respective production cost of veneers and the veneer-based wood panels. The high utilization prospects of the examined wood species in veneer production, even those bearing various defects, is highlighted.

Structural Implications of Reciprocal Exchange: A Power-Dependence Approach

2009 ◽  
Vol 72 (3) ◽  
pp. 226-240 ◽  
Author(s):  
Phillip Bonacich ◽  
Elisa Jayne Bienenstock
Keyword(s):  
General Model ◽  
Experimental Results ◽  
Power Dependence ◽  
Exchange Networks ◽  
Reciprocal Exchange ◽  
Exchange Patterns ◽  
The Relationship ◽  
Network Exchange ◽  
Norm Of Reciprocity

This paper presents and tests a general model to predict emergent exchange patterns and power differences in reciprocal exchange networks when individual actors follow the norm of reciprocity. With an interesting qualification, the experimental results reported here support the power-dependence approach (Emerson 1972a, b): those who acquire the most resources are connected to others who are dependent on them for rewards. Although, as Molm has abundantly demonstrated (1999, 2000, 2001, 2007), the quality of the relationship in negotiated and reciprocal exchange networks is quite different, and the details of a general model of network exchange might well differ for negotiated and reciprocal exchange, experimental results presented here indicate that power in networks, no matter how complex, is linked to dependence regardless of whether actors are motivated by rational choice or a norm of reciprocity.

scholarly journals Study on the mechanics of textile thread in woven

2021 ◽  
Vol 304 ◽  
pp. 03035
Author(s):  
Sanovar Khamrayeva ◽  
Dilfuza Kadirova ◽  
Sayidvoris Rakhimkhodjayev
Keyword(s):  
Friction Surface ◽  
Linear Density ◽  
Textile Yarn ◽  
Friction Angle ◽  
Angle Of Friction ◽  
Current State ◽  
Thread Tension ◽  
The Relationship ◽  
Textile Thread

Specialists in the weaving industry are often interested in the question of what tension of the warp and weft threads must be set on the weaving machine to produce a particular fabric. Along with this, they are interested in the question of what is the relationship between these parameters and the structure of the fabric, how much it is necessary to increase or decrease the tension of the warp and weft threads when changing the assortment of fabric. These problems arise because the correct thread tension on weaving machines increases the productivity of equipment and labor, and also improves the quality of the fabrics produced. The current state of the mechanics of a weighty deformable flexible thread on a plane and other forms of guides do not take into account the rigidity of the threads on the friction surface, since this parameter is determined by the type and type of threads, the linear density of the threads and the elastic properties of the threads. Therefore, the article analyzes the work on the mechanics of textile yarn and studies of the tension of the yarns were carried out depending on the radius of friction, angle of friction, coefficient of friction and stiffness of the yarns.

scholarly journals Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1216
Author(s):  
Jun Zha ◽  
Hangcheng Zhang ◽  
Yipeng Li ◽  
Yaolong Chen
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Path Generation ◽  
Optical Components ◽  
Validation Experiment ◽  
Polishing Path ◽  
Computer Controlled Optical Surfacing ◽  
The Relationship ◽  
Convolution Effect

This study proposes two path generation algorithms to diminish the superposition of the convolution effect on the polishing path in computer-controlled optical surfacing. According to the polishing of aluminum-alloy based hyperboloid optical components, different proportions of polishing agents were blended. Then, the surface roughness of the optical components were determined through a validation experiment of the algorithms. Furthermore, the relationship between surface roughness and the polishing agent concentration, and the compensation strategies for surface roughness were analyzed. The results show that the two algorithms effectively compensated for surface waviness. The findings support the strategies for improving the surface quality of optical components with aspherical surfaces.

Study on Surface Roughness Transformation during Metal Rolling

2012 ◽  
Vol 706-709 ◽  
pp. 2517-2522
Author(s):  
Saud Almotairy ◽  
Dong Bin Wei ◽  
Zheng Yi Jiang
Keyword(s):  
Surface Roughness ◽  
Quality Factor ◽  
Processing Parameters ◽  
Experimental Results ◽  
Thin Strip ◽  
Manufacturing Processes ◽  
Strip Surface ◽  
New Findings ◽  
Cold Rolled

Increasing the demand for cold rolled ultra thin strip as feedstock for miniaturized products has encouraged researchers to investigate the ways to increase the quality of such products, especially those related to strip surface roughness. Surface is known as quality factor in most of manufacturing processes. In this paper, the effect of the rolling parameters on the surface roughness transformation during metal rolling has been studied. The experimental results demonstrate that the surface roughness transformation during the metal rolling is highly affected by the designation of the processing parameters such as finishing temperature, reduction, rolling passes and lubrication. The results have been discussed to verify the validity of the new findings.

Study on Surface Roughness Transformation during Metal Rolling

2011 ◽  
Vol 418-420 ◽  
pp. 897-902
Author(s):  
Saud Almotairy ◽  
Dong Bin Wei ◽  
Zheng Yi Jiang
Keyword(s):  
Surface Roughness ◽  
Quality Factor ◽  
Processing Parameters ◽  
Experimental Results ◽  
Thin Strip ◽  
Manufacturing Processes ◽  
Strip Surface ◽  
New Findings ◽  
Cold Rolled

Increasing the demand for cold rolled ultra thin strip as feedstock for miniaturized products has encouraged researchers to investigate the ways to increase the quality of such products, especially those related to strip surface roughness. Surface is known as quality factor in most of manufacturing processes. In this paper, the effect of the rolling parameters on the surface roughness transformation during metal rolling has been studied. The experimental results demonstrate that the surface roughness transformation during metal rolling is highly affected by the designation of the processing parameters such as finishing temperature, reduction, rolling passes and lubrication. The results have been discussed to verify the validity of the new findings.

scholarly journals A Proposed Scan Strategy Used on SLM Inner Structure Part

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 937 ◽  
Author(s):  
Jitai Han ◽  
Meiping Wu ◽  
Weipeng Duan
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Laser Energy ◽  
Side Surface ◽  
Test Results ◽  
New Strategy ◽  
Optimal Surface ◽  
The Relationship ◽  
Main Factor

A model with an inner structure was designed to study the relationship between the surface quality of the inner structure and the scan strategy in this study. The test results showed that the precision of the inner structure was highly affected by the scan strategy, and the specimens printed using different strategies showed different performances on the surface quality of the inner structure. The specimen printed using the square-framed scan strategy had a lower flatness value on the positive face of the inner structure compared to that of the other two specimens printed using Z-shape scan strategies, while the specimen printed using the Z-shape scan strategy (along the inner structure) had a relative optimal surface roughness on the side surface of the inner structure in all three specimens. The bending deformation caused by the scan strategies was considered to be the main factor affecting the flatness on the positive surface, while laser energy fluctuation showed a significant impact on side surface roughness. Combined with the experimental data, a new scan strategy was proposed; we found that the specimen printed using this new strategy improved positive surface flatness and side surface roughness.

On the Evaluation Method of Wavelet Analysis for Surface Roughness

2010 ◽  
Vol 44-47 ◽  
pp. 4077-4080
Author(s):  
Mei Fa Huang ◽  
Xiong Cheng ◽  
Bing Kuang ◽  
Jiang Tai Huang
Keyword(s):  
Surface Roughness ◽  
Wavelet Analysis ◽  
Surface Topography ◽  
Evaluation Method ◽  
Surface Profile ◽  
Experimental Results ◽  
Roughness Profile ◽  
Mallat Algorithm ◽  
New Generation

The quality of workpiece is influenced by the surface roughness. However, the assessment of parameters of surface roughness is not researched intensively in the new generation GPS standards system. This paper presents a method to assess parameters of surface roughness. The methodology adopts wavelet analysis to construct the model of surface topography and uses the mallat algorithm to separate roughness profile from surface topography. The assessment results of surface profile are calculated according to the standard ISO 4287:1997. The experimental results show that the method not only avoids simplicity the assessment of parameters, but also decreases the number of productions of mis-acceptance and mis-rejection.

scholarly journals Physical origin of a complicated tactile sensation: ‘ shittori feel'

2019 ◽  
Vol 6 (7) ◽  
pp. 190039 ◽  
Author(s):  
Kana Kikegawa ◽  
Rieko Kuhara ◽  
Jinhwan Kwon ◽  
Maki Sakamoto ◽  
Reiichiro Tsuchiya ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Regression Analysis ◽  
Physical Properties ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Solid Material ◽  
Tactile Sensation ◽  
Material Surface ◽  
Physical Origin ◽  
The Relationship

Shittori feel is defined as a texture that is moderately moisturized; however, many people experience ‘ shittori feel’ when they touch a dry solid material containing little liquid. Here, shittori feel was evaluated for 12 materials. We found that the highest score of shittori feel was achieved by powders. Multiple regression analysis showed that shittori feel is a complex sense of moist and smooth feels. We analysed the relationship between the physical properties and the moist/smooth feels to show how subjects felt certain feels simultaneously. The moist and smooth feels are related to the surface roughness and friction characteristics of the materials. The moist and smooth feels can be perceived when the finger starts to move on the material surface and when the finger moves and rubs the material surface, respectively.

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