Characterization Of The Anistropic Behavior Of Liquid Spreading In Fabrics And Development Of Test Apparatus

The transmission of liquid in fabrics is widespread in life,such as unidirectional water transport clothing,directional water transport geotextiles in the field of industrial textiles,etc.Due to the lack of quantitative characterization and instrumental measurement methods for directional water transport fabric in the product development process,the functional degree of the developed products is difficult to characterize.Therefore,a test method for liquid transport in fabrics and a characterization index are provided,which not only plays a good guiding significance role in improving the performance of the product,but also provides a reference for the theoretical mechanism research of directional transport of liquids in fabrics.In order to meet the test requirements,it can quickly and accurately detect the liquid diffusion details in the fabric,and grasp the diffusion trend of the liquid in real time.In this paper,based on image processing and the drop diffusion,a test apparatus for liquid spreading in fabric is designed.The upper and lower camera can simultaneously collect images,and the image processing system realizes data extraction and analysis for the dynamic liquid spreading in fabrics,it is used to test the change of liquid dynamic transmission in fabrics.The test indexes are proposed such as the curve of diffusion displacement of the ? angle on the circumference,the diffusion area,the diffusion circumference,the diffusion displacement standard deviation SD,and the ratio of total diffusion displacement in longitudinal and lateral direction K.At the same time,the parameters of the test device are completed after repeated test,the normative operation method of the test apparatus were formulated.In addition,the results show that the apparatus meets the test requirements,the repeatability is good,and the measurement data is objective and effective.In this paper,the liquid spreading properties in fabrics of 8 kinds of woven fabrics and 5kinds of knitted fabrics were tested,and different anisotropy laws were obtained.In the early stage of liquid diffusion,the curve of the diffusion displacement standard deviation is nonlinear stepwise growth,and the diffusion equilibrium stage tends to be stable;the curve of the total diffusion displacement ratio in longitudinal and lateral direction increase logarithmically.For woven fabrics,the results show that the liquid transport anisotropy is affected by factors such as fiber properties,yarn count,microstructure,warp and weft density,etc.Due to the thickness of the fabric and the gravity factor,the difference in liquid diffusion between the upper and lower fabric surfaces is not obvious.During the diffusion equilibrium phase,the diffusion pattern of S3 plain wool fabric has a rhombic shape,and the degree of in-plane anisotropy is remarkable.the ratio of total diffusion displacement in longitudinal and lateral direction K tends to 1;The diffusion displacement of S8 cotton twill fabric along the grain direction of the fabric is higher than other directions,the degree of in-plane anisotropy is significant,the ratio of total diffusion displacement in longitudinal and lateral direction K>1,and the liquid diffusion along the vertical direction is higher than the weft direction;S5 polyester/cotton 85/15 blended plain fabric has a significant degree of in-plane anisotropy due to the difference in warp and weft density.The ratio of total diffusion displacement in longitudinal and lateral direction K>1,and the liquid along the warp direction is significantly higher than the weft direction.S2 plain hemp fabrics have different differences in the number of warp and weft yarns,and the degree of in-plane anisotropy is not significant.The ratio of total diffusion displacement in longitudinal and lateral direction K<1,and the liquid has a tendency to diffuse along the weft direction.For knitted fabrics,the test results show that the anisotropy of liquid transport in fabric is affected by the existence of the yarn,most of which have a regular structure,the longitudinal and lateral total diffusion displacement ratio K>1,the liquid diffusion in the longitudinal direction is greater than the Landscape direction,no The organization of the rules spreads irregularly;Due to the fluffy structure of the knitted fabric,the difference in the diffusion between the knitted fabrics was obvious.In the diffusion equilibrium stage,W4 bead structure forms a special honeycomb network structure due to the existence of the tuck circle,and the degree of anisotropy of the liquid on the fabric surface is significant.The ratio of total diffusion displacement in longitudinal and lateral direction K<1,and the lateral diffusion displacement is higher than the longitudinal direction;2+2 rib structure formed concave and convex stripes to hinder liquid diffusion on fabrics,the degree of in-plane anisotropy is not significant,The ratio of total diffusion displacement in longitudinal and lateral direction K>1,and the longitudinal diffusion tendency is higher than the transverse direction;When the other parameters are limited,the in-plane diffusion of liquid is affected by the thickness of the fabric,Due to W1 fabric is higher than W2 fabric in thickness,The degree of in-plane anisotropy and the ratio of total diffusion displacement in longitudinal and lateral direction of the W1 fabric lower than W2 fabric.The test data of different samples have significant differences.The diffusion displacement curve,the degree of in-plane anisotropy,the liquid penetration time and other indicators can fully characterize the difference of liquid diffusion properties in the three-dimensional direction of the fabric,and prove the rationality and evaluation system of the test device again.It can be used as a test index for evaluating the anisotropy of different types of fabrics.In this paper,test methods and characterization evaluations are proposed for liquid transport in fabrics.A test apparatus for liquid spreading in fabric has been developed.The anisotropy characteristics of different kinds of woven fabrics and knitted fabrics are discussed,which lays a foundation for establishing a more comprehensive evaluation method of fabric anisotropy,which is beneficial to the development and market positioning of the fixed liquid products.