With the wide use of three-dimensional woven spacer composites(3DWSCs),the market expects greater mechanical properties from this material.By changing the weft fastening method of the traditional I-shape pile yarns,we...With the wide use of three-dimensional woven spacer composites(3DWSCs),the market expects greater mechanical properties from this material.By changing the weft fastening method of the traditional I-shape pile yarns,we designed three-dimensional woven spacer fabrics(3DWSFs)and 3DWSCs with the weft V-shape to improve the compression performance of traditional 3DWSFs.The effects of weft binding structures,V-pile densities,and V-shaped angle were investigated in this paper.It is found that the compression resistance of 3DWSFs with the weft V-shape is improved compared to that with the weft I-shape,the fabric height recovery rate is as high as 95.7%,and the average elastic recovery rate is 59.39%.When the interlayer pile yarn density is the same,the weft V-shaped and weft I-shaped 3DWSCs have similar flatwise pressure and edgewise pressure performance.The compression properties of the composite improve as the density of the V-pile yarns increases.The flatwise compression load decreases as the V-shaped angle decreases.When the V-shaped angle is 28°and 42°,the latitudinal V-shaped 3DWSCs perform exceptionally well in terms of anti-compression cushioning.The V-shaped weft binding method offers a novel approach to structural design of 3DWSCs.展开更多
The work investigated surface and mechanical properties of untreated and treated three-layered weftknitted spacer fabrics.In order to optimize the mechanical properties of weft-knitted spacer fabrics,silica aerogels(S...The work investigated surface and mechanical properties of untreated and treated three-layered weftknitted spacer fabrics.In order to optimize the mechanical properties of weft-knitted spacer fabrics,silica aerogels(SAs)coating was employed.Scanning electron microscopy(SEM)images of untreated and treated spacer fabrics were analyzed to ensure the presence of SAs on the coated spacer fabrics.The basic properties of uncoated and coated weftknitted spacer fabrics were studied and compared.Tensile strength and initial modulus were studied according to the GB/T3923 test standard YG026 MB-250 by testing machine.Moreover,compression properties of spacer fabrics were also tested by HD026 G test instrument.In this testing,work of compression,the linearity of compression,recovery work of compression and other parameters were calculated from stress and strain curves.It was found that SAs coating has a significant influence on the mechanical properties of weftknitted spacer fabrics.The statistical analysis also verified the significant performance(P value smaller than 0.05)of treated fabric samples at the 0.05 level.展开更多
The properties of the warp knitted spacer fabrics for pressure reduction are experimentally investigated and compared to other materials.The influences of the different parameters, such as thickness, spacer yarn diame...The properties of the warp knitted spacer fabrics for pressure reduction are experimentally investigated and compared to other materials.The influences of the different parameters, such as thickness, spacer yarn diameter and connecting form are also analyzed and discussed. The results have shown that the spacer fabrics have very good properties for pressure reduction when they are used as soles, mattress or cushions.展开更多
Spacer fabric is a typical three-dimensional fabric,including upper layer,lower layer,and spacer layer.It is widely applied in protecting cushion products for unique space structure,which attributes good comfortabilit...Spacer fabric is a typical three-dimensional fabric,including upper layer,lower layer,and spacer layer.It is widely applied in protecting cushion products for unique space structure,which attributes good comfortability to infants and the disabled elderly in reducing diseases resulting from hot and humidity under long-time sitting and lying period.It necessitates studying the microenvironment change between body and clothes and corresponding performance.Compressibility,air permeability,heat and moisture permeability, and bending and humiture in microenvironment of spacer fabric are analyzed and compared with foam cushion and nonwoven cushion.Experimental results show that corresponding performance of spacer fabric is better in protecting cushion than those of foam and nonwoven.Compared with traditional foam cushion and non-woven cushion,spacer fabric is more suitable for protecting cushion,and provides an alternative and optimal cushion material in medical products to protect infants and the disabled elderly from bedsores resulted from long-time sitting and lying.展开更多
Wireless communication technology is indispensable in our daily lives,but it also results in serious electromagnetic radiation pollution.Hence,developing smart electromagnetic interference shielding materials with adj...Wireless communication technology is indispensable in our daily lives,but it also results in serious electromagnetic radiation pollution.Hence,developing smart electromagnetic interference shielding materials with adjustable electromagnetic wave(EMW)responses holds significant promise for future electromagnetic shielding devices.In this study,we propose an electromagnetic shielding switch(ESS)characterized by tunable electromagnetic shielding performance achieved by fabricating a three-dimensional(3D)carbon nanotube-based spacer fabric(CNT-SF)and modifying CNT-SF with chemical vapor deposition(CCNT-SF).The CCNT-SF displays direction-dependent electrical conductivity by manipulating the warp and weft density,measuring 128 S/m transversely and 447 S/m vertically.This characteristic allows the CCNT-SF to transmit or shield EMW by adjusting the angle of EMW incidence through fabric rotation,resulting in anisotropic electromagnetic shielding performance(33 dB transversely and 87 dB vertically).This feature enables switchable shielding with an on/off ratio of 2.64.Furthermore,the unique 3D structure confers excellent mechanical properties on the fabric,with compressive strength reaching 120 kPa.As a flexible,lightweight,and mechanically robust ESS,the CCNT-SF holds promising prospects for mitigating the challenges of increasingly severe and intricate electromagnetic environments.展开更多
基金Fundamental Research Funds for the Central Universities,China(Nos.2232022D-11 and 22D128102/007)Jiangsu Transformation and Upgrading Funding Program for Industrial and Information Industry,ChinaShanghai Natural Science Foundation of Shanghai Municipal Science and Technology Commission,China(No.20ZR1401600)。
文摘With the wide use of three-dimensional woven spacer composites(3DWSCs),the market expects greater mechanical properties from this material.By changing the weft fastening method of the traditional I-shape pile yarns,we designed three-dimensional woven spacer fabrics(3DWSFs)and 3DWSCs with the weft V-shape to improve the compression performance of traditional 3DWSFs.The effects of weft binding structures,V-pile densities,and V-shaped angle were investigated in this paper.It is found that the compression resistance of 3DWSFs with the weft V-shape is improved compared to that with the weft I-shape,the fabric height recovery rate is as high as 95.7%,and the average elastic recovery rate is 59.39%.When the interlayer pile yarn density is the same,the weft V-shaped and weft I-shaped 3DWSCs have similar flatwise pressure and edgewise pressure performance.The compression properties of the composite improve as the density of the V-pile yarns increases.The flatwise compression load decreases as the V-shaped angle decreases.When the V-shaped angle is 28°and 42°,the latitudinal V-shaped 3DWSCs perform exceptionally well in terms of anti-compression cushioning.The V-shaped weft binding method offers a novel approach to structural design of 3DWSCs.
文摘The work investigated surface and mechanical properties of untreated and treated three-layered weftknitted spacer fabrics.In order to optimize the mechanical properties of weft-knitted spacer fabrics,silica aerogels(SAs)coating was employed.Scanning electron microscopy(SEM)images of untreated and treated spacer fabrics were analyzed to ensure the presence of SAs on the coated spacer fabrics.The basic properties of uncoated and coated weftknitted spacer fabrics were studied and compared.Tensile strength and initial modulus were studied according to the GB/T3923 test standard YG026 MB-250 by testing machine.Moreover,compression properties of spacer fabrics were also tested by HD026 G test instrument.In this testing,work of compression,the linearity of compression,recovery work of compression and other parameters were calculated from stress and strain curves.It was found that SAs coating has a significant influence on the mechanical properties of weftknitted spacer fabrics.The statistical analysis also verified the significant performance(P value smaller than 0.05)of treated fabric samples at the 0.05 level.
文摘The properties of the warp knitted spacer fabrics for pressure reduction are experimentally investigated and compared to other materials.The influences of the different parameters, such as thickness, spacer yarn diameter and connecting form are also analyzed and discussed. The results have shown that the spacer fabrics have very good properties for pressure reduction when they are used as soles, mattress or cushions.
基金National Natural Science Foundations of China(Nos.51203022,11272086)the Fundamental Research Funds for the Central Universities(No.14D110101),ChinaDHU Distinguished Young Professor Program,China(No.B201307)
文摘Spacer fabric is a typical three-dimensional fabric,including upper layer,lower layer,and spacer layer.It is widely applied in protecting cushion products for unique space structure,which attributes good comfortability to infants and the disabled elderly in reducing diseases resulting from hot and humidity under long-time sitting and lying period.It necessitates studying the microenvironment change between body and clothes and corresponding performance.Compressibility,air permeability,heat and moisture permeability, and bending and humiture in microenvironment of spacer fabric are analyzed and compared with foam cushion and nonwoven cushion.Experimental results show that corresponding performance of spacer fabric is better in protecting cushion than those of foam and nonwoven.Compared with traditional foam cushion and non-woven cushion,spacer fabric is more suitable for protecting cushion,and provides an alternative and optimal cushion material in medical products to protect infants and the disabled elderly from bedsores resulted from long-time sitting and lying.
基金funded by the Youth Innovation Promotion Association,CAS(D.M.H.)and the Suzhou Municipal Science and Technology Bureau(No.SJC2021008).
文摘Wireless communication technology is indispensable in our daily lives,but it also results in serious electromagnetic radiation pollution.Hence,developing smart electromagnetic interference shielding materials with adjustable electromagnetic wave(EMW)responses holds significant promise for future electromagnetic shielding devices.In this study,we propose an electromagnetic shielding switch(ESS)characterized by tunable electromagnetic shielding performance achieved by fabricating a three-dimensional(3D)carbon nanotube-based spacer fabric(CNT-SF)and modifying CNT-SF with chemical vapor deposition(CCNT-SF).The CCNT-SF displays direction-dependent electrical conductivity by manipulating the warp and weft density,measuring 128 S/m transversely and 447 S/m vertically.This characteristic allows the CCNT-SF to transmit or shield EMW by adjusting the angle of EMW incidence through fabric rotation,resulting in anisotropic electromagnetic shielding performance(33 dB transversely and 87 dB vertically).This feature enables switchable shielding with an on/off ratio of 2.64.Furthermore,the unique 3D structure confers excellent mechanical properties on the fabric,with compressive strength reaching 120 kPa.As a flexible,lightweight,and mechanically robust ESS,the CCNT-SF holds promising prospects for mitigating the challenges of increasingly severe and intricate electromagnetic environments.